ELECTRONIC SCIENCE-PAGE 1
ELECTRONIC SCIENCE MCQs
1. In a JFET the change in drain current is due to the applied
(A) Electric field between S and D
(B) Electric field between G and S
(C) Magnetic field between S and D
(D) Magnetic field between G and S
Ans: B
2. The increase in temperature, the electrical conductivity would
(A) increase in metals as well as increase in semiconductors
(B) increase in metals but decrease in semiconductors
(C) decrease in metals but increase in semiconductors
(D) decrease in metals as well as in semiconductors
Ans: C
3. A network contains only independent current sources and resistors. If values of all resistors are doubled, then values of node voltages
(A) will become half
(B) will remain unchanged
(C) will become double
(D) cannot be determined unless circuit configuration and values of the resistors are known
Ans: D
4. Thevenin’s theorem replaces a complicated circuit facing a load by an
(A) ideal voltage source and parallel resistor
(B) ideal current source and parallel resistor
(C) ideal current source and series resistor
(D) ideal voltage source and series resistor
Ans: D
5. When Op-Amp is used as an integrator, the feedback element is
(A) Resistor
(B) Capacitor
(C) Zener diode
(D) Voltage divider
Ans: B
6. How many Flip-Flops are required to build a binary counter circuit to count from 0 to 1023?
(A) 1
(B) 6
(C) 10
(D) 24
Ans: C
7. Among the following, the slowest ADC (Analog-to-digital converter) is
(A) Parallel-comparator (i.e.) flash type
(B) Successive approximation type
(C) Integrating type
(D) Counting type
Ans: B
8. In a microcomputer, WAIT states are used to
(A) make the processor wait during a DMA operation
(B) make the processor wait during a power interrupt processing
(C) make the processor wait during a power shut down
(D) interface slow peripherals to the processor
Ans: D
9. In a microprocessor, the register which holds the address of the next instruction to be fetched is
(A) Accumulator
(B) Program Counter
(C) Stack Pointer
(D) Instructor Register
Ans: B
10. Consider the following structure and declaration:
1. struct date {
2. int day;
3. int month;
4. int year;
5. };
Struct data *pd ;
Which of the following is the correct method to refer to the year member?
(A) (*pd)×year
(B) (*pd)*year
(C) (*pd)®year
(D) pd®year
Ans: A
11. Which of the following is not a linear data structure?
(A) Array
(B) Linked list
(C) Stack
(D) Tree
Ans: D
12. Time-Division Multiplexing
(A) can be used with PAM only.
(B) combines five groups into a supergroup.
(C) stacks 24 channels in adjacent frequency slots.
(D) interleaves pulses belonging to different transmissions.
Ans: D
13. One of the following types of noise becomes of great importance at high frequencies. It is the
(A) Shot noise
(B) Random noise
(C) Impulse noise
(D) Transit-time noise
Ans: D
14. A relaxation oscillator is one which
(A) oscillates continuously
(B) has two stable states
(C) relax indefinitely
(D) produces non-sinusoidal output
Ans: D
15. The transducer which generates electrical power
(A) Photoconductor
(B) Photodiode
(C) Solar cell
(D) Phototransistor
Ans: C
16. The step-index monomode fiber has diameter
(A) < 10 μm
(B) 50 μm
(C) 100 μm
(D) 200 μm
Ans: A
17. Consider the following circuit configurations :
1. Common emitter
2. Common base
3. Emitter follower
4. Emitter follower using Dartington pair.
The correct sequence in increasing order of the input resistances of these configurations is
(A) 2, 1, 4, 3
(B) 1, 2, 4, 3
(C) 2, 1, 3, 4
(D) 1, 2, 3, 4
Ans: C
18. Digital measuring instruments use the following types of A to D converters :
1. Dual slope Type
2. Counter Type
3. Flash Type
The correct sequence for these converters in decreasing order of their speed (fastest to slowest) is
(A) 3, 1, 2
(B) 1, 2, 3
(C) 2, 3, 1
(D) 3, 2, 1
Ans: D
19. Consider the following logic families :
1. MOS
2. DTL
3. RTL
4. ECL
The sequence of the logic families in the order of their increasing noise margin is
(A) 3, 4, 1, 2
(B) 3, 4, 2, 1
(C) 4, 3, 1, 2
(D) 4, 3, 2, 1
Ans: D
20. Consider the following communication systems :
1. FM Broadcast
2. AM Broadcast
3. Microwave Communication
4. Optical Fiber Communication
The sequence of the communication systems in the order of their increasing carrier frequency is
(A) 4, 2, 1, 3
(B) 2, 1, 3, 4
(C) 1, 2, 3, 4
(D) 3, 4, 1, 2
Ans: B
21. The highest data rate can be transmitted using following cables :
1. Co-axial cable
2. Twisted-wire cable
3. Optical fiber cable
The correct sequence in the increasing order is
(A) 1, 3, 2
(B) 3, 1, 2
(C) 2, 1, 3
(D) 3, 2, 1
Ans: C
22. The tie-set schedule gives relation between
(A) branch currents and link currents
(B) branch voltages and link currents
(C) branch currents and link voltages
(D) branch voltages and link voltages
Ans: A
23. If differential amplifier has a differential gain of 20,000. CMRR = 80 dB, then common mode gain is
(A) 2
(B) 1
(C) 1/2
(D) 0
Ans: A
24. For proper operation of integrators, its RC time constant and period T of the wave should be such that
(A) T >> RC
(B) T << RC
(C) T = RC
(D) T = 2 ln RC
Ans: B
25. The phase shift introduced by feed network or amplifier in Wein bridge oscillator is
(A) 0°
(B) 90°
(C) 180°
(D) 270°
Ans: A
26. Number of flip-flops needed to construct a shift register capable of storing decimal numbers upto 32 are
(A) 6
(B) 4
(C) 5
(D) 2
Ans: A
27. The control word of ‘0B5H’ of 8253 indicates that the following counter is selected
(A) Counter 0
(B) Counter 1
(C) Counter 2
(D) Counter 3
Ans: C
28. In 8051, Pin 30 (ALE / PROG), if this bit is set as logic zero (‘0’), it signifies
(A) Address is latched
(B) For enabling internal ROM of programming
(C) For disabling internal ROM programming
(D) Both (A) and (C)
Ans: B
29. The expression a = 7/22 * (3.14 + 2) * 3/5 evaluates to
(A) 8.28
(B) 6.28
(C) 3.14
(D) 0
Ans: D
30. Which escape sequence takes the cursor to the beginning of the current line?
(A) \n
(B) \r
(C) \a
(D) \t
Ans: B
31. The depth of penetration of a wave in a lossy dielectric increases with increasing
(A) Conductivity
(B) Permeability
(C) Wavelength
(D) Permittivity
Ans: C
32. A very lossy, l/4 long, 50 ohm transmission line is open circuited at the load end. The input impedance measured at the other end of the line is approximately
(A) 0
(B) 50 ohm
(C) ¥
(D) 200 ohm
Ans: A
33. In the spectrum of frequency modulated wave
(A) The carrier frequency disappears when the modulation index is large.
(B) The amplitude of any side band depends on the modulation index.
(C) The total number of side bands depends on the modulation index.
(D) The carrier frequency cannot disappear.
Ans: D
34. Indicate which one of the following is not an advantage of FM over AM:
(A) Better noise immunity is provided
(B) Lower bandwidth is required
(C) The transmitted power is more useful
(D) Less modulating power is required
Ans: A
35. Indicate the noise source which belongs to category a different from that of the other three.
(A) Solar noise
(B) Cosmic noise
(C) Atmospheric noise
(D) Galactic noise
Ans: C
36. Dispersion shifted wavelength in optical fiber is
(A) 800 nm
(B) 1300 nm
(C) 1550 nm
(D) 400 nm
Ans: C
37. The problem, with PI controller is its response to transients, is
(A) very fast
(B) having a dead zone
(C) non-linear
(D) sluggish
Ans: D
38. Which is the most linear temperature transducer?
(A) Thermocouple
(B) RTD
(C) IC-sensor
(D) Thermistor
Ans: C
39. The variations in the ambient temperature effect the following parameters:
(A) Sensitivity
(B) Accuracy
(C) Stability
(D) Above all
Ans: A
40. Arrange the following in the increasing order of their forbidden energy gap:
I. Conductors
II. Insulators
III. Germanium
IV. Silicon
(A) I, II, III, IV
(B) I, II, IV, III
(C) I, III, IV, II
(D) I, IV, III,II
Ans: C
41. The correct order in which time domain response is obtained for a network
I. Laplace transform
II. Differential equation
III. Time domain response
IV. Network
(A) I, II, III, IV
(B) II, III, IV, I
(C) III, IV, II, I
(D) IV, II, I, III
Ans: D
42. The correct start to end sections of a regulator circuit are
I. Filtering
II. Protection
III. Rectification
IV. Regulation
(A) II, I, III, IV
(B) III, II, IV, I
(C) I, III, IV, II
(D) IV, II, I, III
Ans: C
43. Arrange the following logic families in the decreasing order of their propagation delay:
I. CMOS
II. TTL
III. ECL
IV. DTL
(A) II, III, IV, I
(B) IV, II, III, I
(C) III, I, II, IV
(D) I, IV, II, III
Ans: D
44. Match List – I with List – II and select the correct answer using codes given below :
List – I List – II
(a) LASER (i) Spontaneous emission
(b) Solar Cell (ii) Consumes electrical power due to the incident light
(c) Photo diode (iii) Delivers power to a load
(d) LED (iv) Stimulated emission
Codes :
(a) (b) (c) (d)
(A) (iv) (iii) (i) (ii)
(B) (iii) (iv) (ii) (i)
(C) (iv) (iii) (ii) (i)
(D) (iii) (iv) (i) (ii)
Ans: C
45. Match List – I with List – II and select the correct answer using codes given below :
List – I List – II
(a) BJT (i) Pinch off effect
(b) FET (ii) Controlled Rectification
(c) SCR (iii) Negative resistance characteristics
(d) Tunnel diode (iv) Punch through effect
Codes :
(a) (b) (c) (d)
(A) (i) (iii) (ii) (iv)
(B) (i) (ii) (iii) (iv)
(C) (iv) (i) (ii) (iii)
(D) (i) (iv) (iii) (ii)
Ans: C
46. Match List – I with List – II and select the correct answer using codes given below :
List – I List – II
(a) Ampere’s law (i) force on a charge
(b) Biot’s law (ii) force due to a current carrying conductor
(c) Coulomb’s law (iii) electric flux density at a point
(d) Gauss’s law (iv) magnetic flux density at a point
Codes :
(a) (b) (c) (d)
(A) (iii) (ii) (i) (iv)
(B) (iv) (ii) (i) (iii)
(C) (iv) (i) (ii) (iii)
(D) (iii) (i) (ii) (iv)
Ans: B
47. Match List – I with List – II and select the correct answer using codes given below :
List – I List – II
(a) Parallel comparator (i) n-bits conversion time
(b) Successive approximation (ii) Fastest converter
(c) Dual slope (iii) Voltage dependent conversion type
(d) Counter type (iv) Integrating type
Codes :
(a) (b) (c) (d)
(A) (ii) (i) (iii) (iv)
(B) (ii) (i) (iv) (iii)
(C) (i) (ii) (iv) (iii)
(D) (i) (ii) (iii) (iv)
Ans: B
48. Match List – I with List – II and select the correct answer using codes given below :
List – I List – II
(a) Frequency modulation (i) Envelope detection
(b) Double sideband suppressed signal carrier (ii) Companding
(c) PCM (iii) Balance modulator
(d) Amplitude modulation (iv) Pre-emphasis and deemphasis
Codes :
(a) (b) (c) (d)
(A) (i) (ii) (iii) (iv)
(B) (i) (ii) (iv) (iii)
(C) (iv) (iii) (i) (ii)
(D) (iv) (iii) (ii) (i)
Ans: D
49. Match List – I with List – II and select the correct answer using codes given below :
List – I List – II
(a) LVDT (i) Pressure
(b) Bourdon tube (ii) Temperature
(c) Strain gauge (iii) Displacement
(d) Thermistor (iv) Stress
Codes :
(a) (b) (c) (d)
(A) (iv) (iii) (ii) (i)
(B) (iii) (ii) (i) (iv)
(C) (iv) (i) (iii) (ii)
(D) (iii) (i) (iv) (ii)
Ans: D
50. Match List – I with List – II and select the correct answer using codes given below :
List – I (Flags) List – II (Bit Position)
(a) Sign flag (i) 4th bit
(b) Parity (ii) 6th bit
(c) Zero (iii) 2nd bit
(d) Auxiliary carry (iv) 7th bit
Codes :
(a) (b) (c) (d)
(A) (i) (iii) (ii) (iv)
(B) (iv) (iii) (ii) (i)
(C) (i) (iv) (iii) (ii)
(D) (ii) (i) (iii) (iv)
Ans: B
(A) Electric field between S and D
(B) Electric field between G and S
(C) Magnetic field between S and D
(D) Magnetic field between G and S
Ans: B
2. The increase in temperature, the electrical conductivity would
(A) increase in metals as well as increase in semiconductors
(B) increase in metals but decrease in semiconductors
(C) decrease in metals but increase in semiconductors
(D) decrease in metals as well as in semiconductors
Ans: C
3. A network contains only independent current sources and resistors. If values of all resistors are doubled, then values of node voltages
(A) will become half
(B) will remain unchanged
(C) will become double
(D) cannot be determined unless circuit configuration and values of the resistors are known
Ans: D
4. Thevenin’s theorem replaces a complicated circuit facing a load by an
(A) ideal voltage source and parallel resistor
(B) ideal current source and parallel resistor
(C) ideal current source and series resistor
(D) ideal voltage source and series resistor
Ans: D
5. When Op-Amp is used as an integrator, the feedback element is
(A) Resistor
(B) Capacitor
(C) Zener diode
(D) Voltage divider
Ans: B
6. How many Flip-Flops are required to build a binary counter circuit to count from 0 to 1023?
(A) 1
(B) 6
(C) 10
(D) 24
Ans: C
7. Among the following, the slowest ADC (Analog-to-digital converter) is
(A) Parallel-comparator (i.e.) flash type
(B) Successive approximation type
(C) Integrating type
(D) Counting type
Ans: B
8. In a microcomputer, WAIT states are used to
(A) make the processor wait during a DMA operation
(B) make the processor wait during a power interrupt processing
(C) make the processor wait during a power shut down
(D) interface slow peripherals to the processor
Ans: D
9. In a microprocessor, the register which holds the address of the next instruction to be fetched is
(A) Accumulator
(B) Program Counter
(C) Stack Pointer
(D) Instructor Register
Ans: B
10. Consider the following structure and declaration:
1. struct date {
2. int day;
3. int month;
4. int year;
5. };
Struct data *pd ;
Which of the following is the correct method to refer to the year member?
(A) (*pd)×year
(B) (*pd)*year
(C) (*pd)®year
(D) pd®year
Ans: A
11. Which of the following is not a linear data structure?
(A) Array
(B) Linked list
(C) Stack
(D) Tree
Ans: D
12. Time-Division Multiplexing
(A) can be used with PAM only.
(B) combines five groups into a supergroup.
(C) stacks 24 channels in adjacent frequency slots.
(D) interleaves pulses belonging to different transmissions.
Ans: D
13. One of the following types of noise becomes of great importance at high frequencies. It is the
(A) Shot noise
(B) Random noise
(C) Impulse noise
(D) Transit-time noise
Ans: D
14. A relaxation oscillator is one which
(A) oscillates continuously
(B) has two stable states
(C) relax indefinitely
(D) produces non-sinusoidal output
Ans: D
15. The transducer which generates electrical power
(A) Photoconductor
(B) Photodiode
(C) Solar cell
(D) Phototransistor
Ans: C
16. The step-index monomode fiber has diameter
(A) < 10 μm
(B) 50 μm
(C) 100 μm
(D) 200 μm
Ans: A
17. Consider the following circuit configurations :
1. Common emitter
2. Common base
3. Emitter follower
4. Emitter follower using Dartington pair.
The correct sequence in increasing order of the input resistances of these configurations is
(A) 2, 1, 4, 3
(B) 1, 2, 4, 3
(C) 2, 1, 3, 4
(D) 1, 2, 3, 4
Ans: C
18. Digital measuring instruments use the following types of A to D converters :
1. Dual slope Type
2. Counter Type
3. Flash Type
The correct sequence for these converters in decreasing order of their speed (fastest to slowest) is
(A) 3, 1, 2
(B) 1, 2, 3
(C) 2, 3, 1
(D) 3, 2, 1
Ans: D
19. Consider the following logic families :
1. MOS
2. DTL
3. RTL
4. ECL
The sequence of the logic families in the order of their increasing noise margin is
(A) 3, 4, 1, 2
(B) 3, 4, 2, 1
(C) 4, 3, 1, 2
(D) 4, 3, 2, 1
Ans: D
20. Consider the following communication systems :
1. FM Broadcast
2. AM Broadcast
3. Microwave Communication
4. Optical Fiber Communication
The sequence of the communication systems in the order of their increasing carrier frequency is
(A) 4, 2, 1, 3
(B) 2, 1, 3, 4
(C) 1, 2, 3, 4
(D) 3, 4, 1, 2
Ans: B
21. The highest data rate can be transmitted using following cables :
1. Co-axial cable
2. Twisted-wire cable
3. Optical fiber cable
The correct sequence in the increasing order is
(A) 1, 3, 2
(B) 3, 1, 2
(C) 2, 1, 3
(D) 3, 2, 1
Ans: C
22. The tie-set schedule gives relation between
(A) branch currents and link currents
(B) branch voltages and link currents
(C) branch currents and link voltages
(D) branch voltages and link voltages
Ans: A
23. If differential amplifier has a differential gain of 20,000. CMRR = 80 dB, then common mode gain is
(A) 2
(B) 1
(C) 1/2
(D) 0
Ans: A
24. For proper operation of integrators, its RC time constant and period T of the wave should be such that
(A) T >> RC
(B) T << RC
(C) T = RC
(D) T = 2 ln RC
Ans: B
25. The phase shift introduced by feed network or amplifier in Wein bridge oscillator is
(A) 0°
(B) 90°
(C) 180°
(D) 270°
Ans: A
26. Number of flip-flops needed to construct a shift register capable of storing decimal numbers upto 32 are
(A) 6
(B) 4
(C) 5
(D) 2
Ans: A
27. The control word of ‘0B5H’ of 8253 indicates that the following counter is selected
(A) Counter 0
(B) Counter 1
(C) Counter 2
(D) Counter 3
Ans: C
28. In 8051, Pin 30 (ALE / PROG), if this bit is set as logic zero (‘0’), it signifies
(A) Address is latched
(B) For enabling internal ROM of programming
(C) For disabling internal ROM programming
(D) Both (A) and (C)
Ans: B
29. The expression a = 7/22 * (3.14 + 2) * 3/5 evaluates to
(A) 8.28
(B) 6.28
(C) 3.14
(D) 0
Ans: D
30. Which escape sequence takes the cursor to the beginning of the current line?
(A) \n
(B) \r
(C) \a
(D) \t
Ans: B
31. The depth of penetration of a wave in a lossy dielectric increases with increasing
(A) Conductivity
(B) Permeability
(C) Wavelength
(D) Permittivity
Ans: C
32. A very lossy, l/4 long, 50 ohm transmission line is open circuited at the load end. The input impedance measured at the other end of the line is approximately
(A) 0
(B) 50 ohm
(C) ¥
(D) 200 ohm
Ans: A
33. In the spectrum of frequency modulated wave
(A) The carrier frequency disappears when the modulation index is large.
(B) The amplitude of any side band depends on the modulation index.
(C) The total number of side bands depends on the modulation index.
(D) The carrier frequency cannot disappear.
Ans: D
34. Indicate which one of the following is not an advantage of FM over AM:
(A) Better noise immunity is provided
(B) Lower bandwidth is required
(C) The transmitted power is more useful
(D) Less modulating power is required
Ans: A
35. Indicate the noise source which belongs to category a different from that of the other three.
(A) Solar noise
(B) Cosmic noise
(C) Atmospheric noise
(D) Galactic noise
Ans: C
36. Dispersion shifted wavelength in optical fiber is
(A) 800 nm
(B) 1300 nm
(C) 1550 nm
(D) 400 nm
Ans: C
37. The problem, with PI controller is its response to transients, is
(A) very fast
(B) having a dead zone
(C) non-linear
(D) sluggish
Ans: D
38. Which is the most linear temperature transducer?
(A) Thermocouple
(B) RTD
(C) IC-sensor
(D) Thermistor
Ans: C
39. The variations in the ambient temperature effect the following parameters:
(A) Sensitivity
(B) Accuracy
(C) Stability
(D) Above all
Ans: A
40. Arrange the following in the increasing order of their forbidden energy gap:
I. Conductors
II. Insulators
III. Germanium
IV. Silicon
(A) I, II, III, IV
(B) I, II, IV, III
(C) I, III, IV, II
(D) I, IV, III,II
Ans: C
41. The correct order in which time domain response is obtained for a network
I. Laplace transform
II. Differential equation
III. Time domain response
IV. Network
(A) I, II, III, IV
(B) II, III, IV, I
(C) III, IV, II, I
(D) IV, II, I, III
Ans: D
42. The correct start to end sections of a regulator circuit are
I. Filtering
II. Protection
III. Rectification
IV. Regulation
(A) II, I, III, IV
(B) III, II, IV, I
(C) I, III, IV, II
(D) IV, II, I, III
Ans: C
43. Arrange the following logic families in the decreasing order of their propagation delay:
I. CMOS
II. TTL
III. ECL
IV. DTL
(A) II, III, IV, I
(B) IV, II, III, I
(C) III, I, II, IV
(D) I, IV, II, III
Ans: D
44. Match List – I with List – II and select the correct answer using codes given below :
List – I List – II
(a) LASER (i) Spontaneous emission
(b) Solar Cell (ii) Consumes electrical power due to the incident light
(c) Photo diode (iii) Delivers power to a load
(d) LED (iv) Stimulated emission
Codes :
(a) (b) (c) (d)
(A) (iv) (iii) (i) (ii)
(B) (iii) (iv) (ii) (i)
(C) (iv) (iii) (ii) (i)
(D) (iii) (iv) (i) (ii)
Ans: C
45. Match List – I with List – II and select the correct answer using codes given below :
List – I List – II
(a) BJT (i) Pinch off effect
(b) FET (ii) Controlled Rectification
(c) SCR (iii) Negative resistance characteristics
(d) Tunnel diode (iv) Punch through effect
Codes :
(a) (b) (c) (d)
(A) (i) (iii) (ii) (iv)
(B) (i) (ii) (iii) (iv)
(C) (iv) (i) (ii) (iii)
(D) (i) (iv) (iii) (ii)
Ans: C
46. Match List – I with List – II and select the correct answer using codes given below :
List – I List – II
(a) Ampere’s law (i) force on a charge
(b) Biot’s law (ii) force due to a current carrying conductor
(c) Coulomb’s law (iii) electric flux density at a point
(d) Gauss’s law (iv) magnetic flux density at a point
Codes :
(a) (b) (c) (d)
(A) (iii) (ii) (i) (iv)
(B) (iv) (ii) (i) (iii)
(C) (iv) (i) (ii) (iii)
(D) (iii) (i) (ii) (iv)
Ans: B
47. Match List – I with List – II and select the correct answer using codes given below :
List – I List – II
(a) Parallel comparator (i) n-bits conversion time
(b) Successive approximation (ii) Fastest converter
(c) Dual slope (iii) Voltage dependent conversion type
(d) Counter type (iv) Integrating type
Codes :
(a) (b) (c) (d)
(A) (ii) (i) (iii) (iv)
(B) (ii) (i) (iv) (iii)
(C) (i) (ii) (iv) (iii)
(D) (i) (ii) (iii) (iv)
Ans: B
48. Match List – I with List – II and select the correct answer using codes given below :
List – I List – II
(a) Frequency modulation (i) Envelope detection
(b) Double sideband suppressed signal carrier (ii) Companding
(c) PCM (iii) Balance modulator
(d) Amplitude modulation (iv) Pre-emphasis and deemphasis
Codes :
(a) (b) (c) (d)
(A) (i) (ii) (iii) (iv)
(B) (i) (ii) (iv) (iii)
(C) (iv) (iii) (i) (ii)
(D) (iv) (iii) (ii) (i)
Ans: D
49. Match List – I with List – II and select the correct answer using codes given below :
List – I List – II
(a) LVDT (i) Pressure
(b) Bourdon tube (ii) Temperature
(c) Strain gauge (iii) Displacement
(d) Thermistor (iv) Stress
Codes :
(a) (b) (c) (d)
(A) (iv) (iii) (ii) (i)
(B) (iii) (ii) (i) (iv)
(C) (iv) (i) (iii) (ii)
(D) (iii) (i) (iv) (ii)
Ans: D
50. Match List – I with List – II and select the correct answer using codes given below :
List – I (Flags) List – II (Bit Position)
(a) Sign flag (i) 4th bit
(b) Parity (ii) 6th bit
(c) Zero (iii) 2nd bit
(d) Auxiliary carry (iv) 7th bit
Codes :
(a) (b) (c) (d)
(A) (i) (iii) (ii) (iv)
(B) (iv) (iii) (ii) (i)
(C) (i) (iv) (iii) (ii)
(D) (ii) (i) (iii) (iv)
Ans: B
51.Match List – I with List – II and select the correct answer using codes given below :
List – I List – II
(a) Gunn diode (i) Junction less device
(b) Solar cell (ii) Single junction device
(c) MOSFET (iii) Double junction device
(d) SCR (iv) Triple junction device
Codes :
(a) (b) (c) (d)
(A) (iv) (i) (ii) (iii)
(B) (iii) (iv) (i) (ii)
(C) (i) (ii) (iii) (iv)
(D) (ii) (iii) (i) (iv)
Ans: C
52. Match List – I with List – II and select the correct answer using codes given below :
List – I List – II
(a) Monostable multivibrator (i) Quasi stable state
(b) Astable multivibrator (ii) One stable state
(c) Schmitt trigger (iii) Two stable state
(d) Bistable multivibrator (iv) No stable state
Codes :
(a) (b) (c) (d)
(A) (i) (ii) (iv) (iii)
(B) (ii) (iv) (i) (iii)
(C) (iii) (i) (ii) (iv)
(D) (iv) (i) (ii) (iii)
Ans: B
53. Match List – I with List – II and select the correct answer using codes given below:
List-I List-II
(a) Gating pulse (i) BJT
(b) Series pass element (ii) Monostable multivibrator
(c) Lock range (iii) Voltage regulator
(d) Base width modulation (iv) PLL
Codes:
(a) (b) (c) (d)
(A) (i) (ii) (iv) (iii)
(B) (ii) (iii) (iv) (i)
(C) (iii) (iv) (i) (ii)
(D) (iv) (ii) (iii) (i)
Ans: B
54. Match the following list:
List-I List-II
(a) Positive OR (i) Negative NAND
(b) Positive AND (ii) Negative AND
(c) Positive NOR (iii) Negative OR
(d) Positive NAND (iv) Negative NOR
Codes:
(a) (b) (c) (d)
(A) (iii) (ii) (i) (iv)
(B) (i) (iv) (ii) (iii)
(C) (ii) (i) (iii) (iv)
(D) (ii) (iii) (i) (iv)
Ans: D
55. Match the following:
List-I List-II
(a) MOV A, B (i) Logical instruction
(b) JNC =address (ii) Arithmetic instruction
(c) OR A, B (iii) Data transfer
(d) ADD A, H (iv) Branching instruction
Codes:
(a) (b) (c) (d)
(A) (ii) (iii) (i) (iv)
(B) (iii) (iv) (i) (ii)
(C) (iv) (iii) (ii) (i)
(D) (iv) (i) (iii) (ii)
Ans: B
56. Match List – I with List – II and select the correct answer using codes given below:
List-I List-II
(a) call by reference (i) Incorrect statement
(b) size of (float); (ii) Function
(c)& (iii) 4
(d) return (a, b); (iv) bitwise AND
Codes:
(a) (b) (c) (d)
(A) (i) (ii) (iii) (iv)
(B) (iv) (iii) (ii) (i)
(C) (ii) (iii) (iv) (i)
(D) (iii) (iv) (i) (ii)
Ans: C
57. Match List – I with List – II and select the correct answer using the codes given below:
List-I List-II
(a) Ferrite devices (i) Oscillator
(b) Magnetron (ii) Bunching
(c) Klystron (iii) Cross field devices
(d) Gun-diode (iv) Circulators
Codes:
(a) (b) (c) (d)
(A) (iv) (ii) (i) (iii)
(B) (iv) (iii) (ii) (i)
(C) (iii) (iv) (ii) (i)
(D) (i) (ii) (iii) (iv)
Ans: B
58. Match the following:
List-I List-II
(a) Digital Filters (i) More channels are =accommodated
(b) Signal Processing (ii) Slow speed of data transfer
(c) Time Division Mulplexing (iii) Hardware techniques
(d) Frequency Division Multiplexing (iv) Software Btechniques
Codes :
(a) (b) (c) (d)
(A) (iv) (iii) (ii) (i)
(B) (i) (ii) (iii) (iv)
(C) (iii) (iv) (i) (ii)
(D) (iv) (iii) (i) (ii)
Ans: A
59. Match List – I with List – II and select the correct answer using the codes given below:
List-I List-II
(a) Fan regulator (i) Two transistor model
(b) SCR (ii) dc-dc conversion
(c) Choppers (iii) Triac-Diac pair
(d) Quantum efficiency (iv) LED
Codes :
(a) (b) (c) (d)
(A) (ii) (iii) (iv) (i)
(B) (iv) (iii) (i) (ii)
(C) (iii) (i) (ii) (iv)
(D) (iii) (ii) (i) (iv)
Ans: C
60. Match the following :
List-I List-II
(a) Small displacement (i) DSO
(b) Phase measurement (ii) X-ray diffractometer
(c) Slowly varying signals (iii) CRO
(d) Crystal structure (iv) LVDT
Codes :
(a) (b) (c) (d)
(A) (iv) (iii) (i) (ii)
(B) (iii) (ii) (iv) (i)
(C) (ii) (i) (iii) (iv)
(D) (i) (iv) (ii) (iii)
Ans: A
Read the paragraph and answer the question 61 to 65:
Noise may be defined, in an electrical sense, as an unwanted form of energy tending to interfere with the proper and easy reception and reproduction of wanted signals. Many disturbances of the electrical nature produce noise in receiver, modifying the signal in an unwanted manner. Noise is divided into two groups. Noise whose sources are external to the receiver and other one is noise created within the receiver itself. Various forms of noise created outside the receiver i.e. external noise includes atmospheric and extra-terrestrial noise and industrial noise. Atmospheric noise becomes less severe at frequencies above 30 MHz. Extra-terrestrial noises are solar noise and cosmic noise. They radiate over a very broad frequency spectrum which includes the frequencies, we use for communication. These disturbances are at the eruption of corona flares and sunspots. The noise generated is due to the random motion of electrons, atoms and molecules. Kinetic theory states that the temperature of the system increases due to the motion of the particles.
61. In a communication system, noise is most likely to affect the signal
(A) at a transmitter
(B) in a channel
(C) in the information source
(D) at the destination
Ans: B
62. Indicate the false statement.
(A) HF mixers are generally noiser than HF amplifiers.
(B) Impulse noise voltage is independent of bandwidth.
(C) Thermal noise is independent of the frequency at which it is measured.
(D) Industrial noise is usually of the impulse type.
Ans: B
63. The value of a resistor creating thermal noise is doubled. The noise power generated is therefore
(A) halved
(B) quadrupled
(C) doubled
(D) unchanged
Ans: D
64. One of the following is not a useful quantity for comparing the noise performance of receivers :
(A) Input noise voltage
(B) Equivalent noise resistance
(C) Noise temperature
(D) Noise figure
Ans: A
65. Indicate the noise whose source is in a category different from that of the other three.
(A) Solar noise
(B) Cosmic noise
(C) Atmospheric noise
(D) Galactic noise
Ans: C
List – I List – II
(a) Gunn diode (i) Junction less device
(b) Solar cell (ii) Single junction device
(c) MOSFET (iii) Double junction device
(d) SCR (iv) Triple junction device
Codes :
(a) (b) (c) (d)
(A) (iv) (i) (ii) (iii)
(B) (iii) (iv) (i) (ii)
(C) (i) (ii) (iii) (iv)
(D) (ii) (iii) (i) (iv)
Ans: C
52. Match List – I with List – II and select the correct answer using codes given below :
List – I List – II
(a) Monostable multivibrator (i) Quasi stable state
(b) Astable multivibrator (ii) One stable state
(c) Schmitt trigger (iii) Two stable state
(d) Bistable multivibrator (iv) No stable state
Codes :
(a) (b) (c) (d)
(A) (i) (ii) (iv) (iii)
(B) (ii) (iv) (i) (iii)
(C) (iii) (i) (ii) (iv)
(D) (iv) (i) (ii) (iii)
Ans: B
53. Match List – I with List – II and select the correct answer using codes given below:
List-I List-II
(a) Gating pulse (i) BJT
(b) Series pass element (ii) Monostable multivibrator
(c) Lock range (iii) Voltage regulator
(d) Base width modulation (iv) PLL
Codes:
(a) (b) (c) (d)
(A) (i) (ii) (iv) (iii)
(B) (ii) (iii) (iv) (i)
(C) (iii) (iv) (i) (ii)
(D) (iv) (ii) (iii) (i)
Ans: B
54. Match the following list:
List-I List-II
(a) Positive OR (i) Negative NAND
(b) Positive AND (ii) Negative AND
(c) Positive NOR (iii) Negative OR
(d) Positive NAND (iv) Negative NOR
Codes:
(a) (b) (c) (d)
(A) (iii) (ii) (i) (iv)
(B) (i) (iv) (ii) (iii)
(C) (ii) (i) (iii) (iv)
(D) (ii) (iii) (i) (iv)
Ans: D
55. Match the following:
List-I List-II
(a) MOV A, B (i) Logical instruction
(b) JNC =address (ii) Arithmetic instruction
(c) OR A, B (iii) Data transfer
(d) ADD A, H (iv) Branching instruction
Codes:
(a) (b) (c) (d)
(A) (ii) (iii) (i) (iv)
(B) (iii) (iv) (i) (ii)
(C) (iv) (iii) (ii) (i)
(D) (iv) (i) (iii) (ii)
Ans: B
56. Match List – I with List – II and select the correct answer using codes given below:
List-I List-II
(a) call by reference (i) Incorrect statement
(b) size of (float); (ii) Function
(c)& (iii) 4
(d) return (a, b); (iv) bitwise AND
Codes:
(a) (b) (c) (d)
(A) (i) (ii) (iii) (iv)
(B) (iv) (iii) (ii) (i)
(C) (ii) (iii) (iv) (i)
(D) (iii) (iv) (i) (ii)
Ans: C
57. Match List – I with List – II and select the correct answer using the codes given below:
List-I List-II
(a) Ferrite devices (i) Oscillator
(b) Magnetron (ii) Bunching
(c) Klystron (iii) Cross field devices
(d) Gun-diode (iv) Circulators
Codes:
(a) (b) (c) (d)
(A) (iv) (ii) (i) (iii)
(B) (iv) (iii) (ii) (i)
(C) (iii) (iv) (ii) (i)
(D) (i) (ii) (iii) (iv)
Ans: B
58. Match the following:
List-I List-II
(a) Digital Filters (i) More channels are =accommodated
(b) Signal Processing (ii) Slow speed of data transfer
(c) Time Division Mulplexing (iii) Hardware techniques
(d) Frequency Division Multiplexing (iv) Software Btechniques
Codes :
(a) (b) (c) (d)
(A) (iv) (iii) (ii) (i)
(B) (i) (ii) (iii) (iv)
(C) (iii) (iv) (i) (ii)
(D) (iv) (iii) (i) (ii)
Ans: A
59. Match List – I with List – II and select the correct answer using the codes given below:
List-I List-II
(a) Fan regulator (i) Two transistor model
(b) SCR (ii) dc-dc conversion
(c) Choppers (iii) Triac-Diac pair
(d) Quantum efficiency (iv) LED
Codes :
(a) (b) (c) (d)
(A) (ii) (iii) (iv) (i)
(B) (iv) (iii) (i) (ii)
(C) (iii) (i) (ii) (iv)
(D) (iii) (ii) (i) (iv)
Ans: C
60. Match the following :
List-I List-II
(a) Small displacement (i) DSO
(b) Phase measurement (ii) X-ray diffractometer
(c) Slowly varying signals (iii) CRO
(d) Crystal structure (iv) LVDT
Codes :
(a) (b) (c) (d)
(A) (iv) (iii) (i) (ii)
(B) (iii) (ii) (iv) (i)
(C) (ii) (i) (iii) (iv)
(D) (i) (iv) (ii) (iii)
Ans: A
Read the paragraph and answer the question 61 to 65:
Noise may be defined, in an electrical sense, as an unwanted form of energy tending to interfere with the proper and easy reception and reproduction of wanted signals. Many disturbances of the electrical nature produce noise in receiver, modifying the signal in an unwanted manner. Noise is divided into two groups. Noise whose sources are external to the receiver and other one is noise created within the receiver itself. Various forms of noise created outside the receiver i.e. external noise includes atmospheric and extra-terrestrial noise and industrial noise. Atmospheric noise becomes less severe at frequencies above 30 MHz. Extra-terrestrial noises are solar noise and cosmic noise. They radiate over a very broad frequency spectrum which includes the frequencies, we use for communication. These disturbances are at the eruption of corona flares and sunspots. The noise generated is due to the random motion of electrons, atoms and molecules. Kinetic theory states that the temperature of the system increases due to the motion of the particles.
61. In a communication system, noise is most likely to affect the signal
(A) at a transmitter
(B) in a channel
(C) in the information source
(D) at the destination
Ans: B
62. Indicate the false statement.
(A) HF mixers are generally noiser than HF amplifiers.
(B) Impulse noise voltage is independent of bandwidth.
(C) Thermal noise is independent of the frequency at which it is measured.
(D) Industrial noise is usually of the impulse type.
Ans: B
63. The value of a resistor creating thermal noise is doubled. The noise power generated is therefore
(A) halved
(B) quadrupled
(C) doubled
(D) unchanged
Ans: D
64. One of the following is not a useful quantity for comparing the noise performance of receivers :
(A) Input noise voltage
(B) Equivalent noise resistance
(C) Noise temperature
(D) Noise figure
Ans: A
65. Indicate the noise whose source is in a category different from that of the other three.
(A) Solar noise
(B) Cosmic noise
(C) Atmospheric noise
(D) Galactic noise
Ans: C
Directions : Question Nos. 66 to 75 :
The following items consist of two statements, one labelled the “Assertion (A)” and the other labelled the “Reason (R)”. You are to examine these two statements carefully and decide if the Assertion (A) and the Reason (R) are individually true and if so, whether the Reason is a correct explanation of the Assertion. Select your answers to these items using the codes given below and mark your answer accordingly.
Codes :
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not correct explanation of (A).
(C) (A) is true, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: A
66. Assertion (A) : If a semiconductor is placed in a transverse magnetic field B and an electric field E is applied across its other two faces, then it would produce an electric current I, in the direction perpendicular to both B and E.
Reason (R) : Hall co-efficient is proportional to the mobility of charge carrier in semi-conductor.
Codes :
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not correct explanation of (A).
(C) (A) is true, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: B
67. Assertion (A) : The voltage-current characteristic of tunnel diode exhibits dynamic negative resistance region.
Reason (R) : The negative resistance occurs, therefore, tunnel diode behaves as low power oscillating device.
Codes :
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not correct explanation of (A).
(C) (A) is true, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: A
68. Assertion (A) : R-2R ladder type D/A converter has a higher speed of conversion than a weighted resistance D/A converter.
Reason (R) : R-2R ladder type D/A converter uses a smaller number of components than the weighted resistance D/A converter.
Codes :
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not correct explanation of (A).
(C) (A) is true, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: C
69. Assertion (A) : A processor can reference a memory stack without specifying an address.
Reason (R) : The address is always available and automatically updated in the stack pointer.
Codes :
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not correct explanation of (A).
(C) (A) is true, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: A
70. Assertion (A) : The part of root locus on the real axis is not dependent upon the poles and zeros which are not on the real axis.
Reason (R) : Poles and zeros which are not on the real axis always occur in conjugate pairs.
Codes :
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not correct explanation of (A).
(C) (A) is true, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: A
71. Assertion (A) : The top down structured programming should be used for developing programmes.
Reason (R) : The top down structured programming methodology enables us to get readable and easily provable program.
Codes :
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not correct explanation of (A).
(C) (A) is true, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: A
72. Assertion (A) : Stimulated emission is the key to the operation of LASER.
Reason (R) : An important property of laser radiation is its coherence, under which is meant the correlation between the phases of oscillation at different positions in space and at various moments of time.
Codes :
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not correct explanation of (A).
(C) (A) is true, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: A
73. Assertion (A) : An half adder is faster than full-adder.
Reason (R) : An half adder gives only one output while a full adder gives two outputs.
Codes :
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not correct explanation of (A).
(C) (A) is true, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: C
74. Assertion (A) : A programmable Read-Only-Memory can be used as a synchronous counter.
Reason (R) : Each memory location of a programmable Read-Only-Memory is programmed and can be read synchronously.
Codes :
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not correct explanation of (A).
(C) (A) is true, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: C
75. Assertion (A) : In PCM a message signal is represented by a sequence of coded pulses, which is accomplished by representing the signal in discrete form in both time and amplitude.
Reason (R) : The signal encoded in the form of quantized samples which translates into a coded number.
Codes :
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not correct explanation of (A).
(C) (A) is true, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: A
The following items consist of two statements, one labelled the “Assertion (A)” and the other labelled the “Reason (R)”. You are to examine these two statements carefully and decide if the Assertion (A) and the Reason (R) are individually true and if so, whether the Reason is a correct explanation of the Assertion. Select your answers to these items using the codes given below and mark your answer accordingly.
Codes :
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not correct explanation of (A).
(C) (A) is true, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: A
66. Assertion (A) : If a semiconductor is placed in a transverse magnetic field B and an electric field E is applied across its other two faces, then it would produce an electric current I, in the direction perpendicular to both B and E.
Reason (R) : Hall co-efficient is proportional to the mobility of charge carrier in semi-conductor.
Codes :
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not correct explanation of (A).
(C) (A) is true, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: B
67. Assertion (A) : The voltage-current characteristic of tunnel diode exhibits dynamic negative resistance region.
Reason (R) : The negative resistance occurs, therefore, tunnel diode behaves as low power oscillating device.
Codes :
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not correct explanation of (A).
(C) (A) is true, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: A
68. Assertion (A) : R-2R ladder type D/A converter has a higher speed of conversion than a weighted resistance D/A converter.
Reason (R) : R-2R ladder type D/A converter uses a smaller number of components than the weighted resistance D/A converter.
Codes :
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not correct explanation of (A).
(C) (A) is true, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: C
69. Assertion (A) : A processor can reference a memory stack without specifying an address.
Reason (R) : The address is always available and automatically updated in the stack pointer.
Codes :
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not correct explanation of (A).
(C) (A) is true, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: A
70. Assertion (A) : The part of root locus on the real axis is not dependent upon the poles and zeros which are not on the real axis.
Reason (R) : Poles and zeros which are not on the real axis always occur in conjugate pairs.
Codes :
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not correct explanation of (A).
(C) (A) is true, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: A
71. Assertion (A) : The top down structured programming should be used for developing programmes.
Reason (R) : The top down structured programming methodology enables us to get readable and easily provable program.
Codes :
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not correct explanation of (A).
(C) (A) is true, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: A
72. Assertion (A) : Stimulated emission is the key to the operation of LASER.
Reason (R) : An important property of laser radiation is its coherence, under which is meant the correlation between the phases of oscillation at different positions in space and at various moments of time.
Codes :
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not correct explanation of (A).
(C) (A) is true, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: A
73. Assertion (A) : An half adder is faster than full-adder.
Reason (R) : An half adder gives only one output while a full adder gives two outputs.
Codes :
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not correct explanation of (A).
(C) (A) is true, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: C
74. Assertion (A) : A programmable Read-Only-Memory can be used as a synchronous counter.
Reason (R) : Each memory location of a programmable Read-Only-Memory is programmed and can be read synchronously.
Codes :
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not correct explanation of (A).
(C) (A) is true, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: C
75. Assertion (A) : In PCM a message signal is represented by a sequence of coded pulses, which is accomplished by representing the signal in discrete form in both time and amplitude.
Reason (R) : The signal encoded in the form of quantized samples which translates into a coded number.
Codes :
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not correct explanation of (A).
(C) (A) is true, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: A
Questions. 76 to 83: The following items consist of two statements, one labelled the ‘Assertion (A)’ and the other labelled the ‘Reason (R)’. You are to examine these two statements and decide if the Assertion (A) and the Reason (R) are individually true and if so, whether the Reason is a correct explanation of the Assertion. Select your answers to these items using the codes given below and mark your answer sheet accordingly.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not the correct explanation of (A).
(C) (A) is true and (R) is false.
(D) (A) is false and (R) is true.
76. Assertion (A): A BJT is said to be operating in a saturation region if both the junctions are forward biased.
Reason (R): In saturation region collector doping concentration is reduced.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not the correct explanation of (A).
(C) (A) is true and (R) is false.
(D) (A) is false and (R) is true.
Ans: B
77. Assertion (A): Schmit trigger employs positive feedback and has hysteresis property that helps to compare two voltage levels.
Reason (R): In some logic circuits rise and fall time play important role in switching. Schmit trigger improves the rise and fall time.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not the correct explanation of (A).
(C) (A) is true and (R) is false.
(D) (A) is false and (R) is true.
Ans: A
78. Assertion (A): The fan out of a CMOS gate is poor.
Reason (R): The current driving capability of CMOS is poor.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not the correct explanation of (A).
(C) (A) is true and (R) is false.
(D) (A) is false and (R) is true.
Ans: D
79. Assertion (A): In 8085 processor, lower byte of address bus and data bus are multiplexed. A latch is required to separate address lines and data lines.
Reason (R): Multiplexing makes processor slow speed and compact.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not the correct explanation of (A).
(C) (A) is true and (R) is false.
(D) (A) is false and (R) is true.
Ans: B
80. Assertion (A): Relational operators cannot be used to evaluate whether a condition evaluates to true (T) or false (F).
Reason (R): Use of ‘=’ as relational operator will form a syntax error.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not the correct explanation of (A).
(C) (A) is true and (R) is false.
(D) (A) is false and (R) is true.
Ans: D
81. Assertion (A): Radio and Television receivers are generally of superheterodyne type.
Reason (R): Wireless communication is possible by receiving signals through superheterodyne receivers.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not the correct explanation of (A).
(C) (A) is true and (R) is false.
(D) (A) is false and (R) is true.
Ans: B
82. Assertion (A): The LED is a light emitting diode, that gives out spontaneous emissions, when it is energized.
Reason (R): The recombination of holes and electrons in semiconductor materials gives off energy in terms of light and heat.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not the correct explanation of (A).
(C) (A) is true and (R) is false.
(D) (A) is false and (R) is true.
Ans: A
83. Assertion (A): Power is integration of energy over a period of time.
Reason (R): The accuracy of power measurement is dependent on integration time constant.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not the correct explanation of (A).
(C) (A) is true and (R) is false.
(D) (A) is false and (R) is true.
Ans: A
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not the correct explanation of (A).
(C) (A) is true and (R) is false.
(D) (A) is false and (R) is true.
76. Assertion (A): A BJT is said to be operating in a saturation region if both the junctions are forward biased.
Reason (R): In saturation region collector doping concentration is reduced.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not the correct explanation of (A).
(C) (A) is true and (R) is false.
(D) (A) is false and (R) is true.
Ans: B
77. Assertion (A): Schmit trigger employs positive feedback and has hysteresis property that helps to compare two voltage levels.
Reason (R): In some logic circuits rise and fall time play important role in switching. Schmit trigger improves the rise and fall time.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not the correct explanation of (A).
(C) (A) is true and (R) is false.
(D) (A) is false and (R) is true.
Ans: A
78. Assertion (A): The fan out of a CMOS gate is poor.
Reason (R): The current driving capability of CMOS is poor.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not the correct explanation of (A).
(C) (A) is true and (R) is false.
(D) (A) is false and (R) is true.
Ans: D
79. Assertion (A): In 8085 processor, lower byte of address bus and data bus are multiplexed. A latch is required to separate address lines and data lines.
Reason (R): Multiplexing makes processor slow speed and compact.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not the correct explanation of (A).
(C) (A) is true and (R) is false.
(D) (A) is false and (R) is true.
Ans: B
80. Assertion (A): Relational operators cannot be used to evaluate whether a condition evaluates to true (T) or false (F).
Reason (R): Use of ‘=’ as relational operator will form a syntax error.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not the correct explanation of (A).
(C) (A) is true and (R) is false.
(D) (A) is false and (R) is true.
Ans: D
81. Assertion (A): Radio and Television receivers are generally of superheterodyne type.
Reason (R): Wireless communication is possible by receiving signals through superheterodyne receivers.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not the correct explanation of (A).
(C) (A) is true and (R) is false.
(D) (A) is false and (R) is true.
Ans: B
82. Assertion (A): The LED is a light emitting diode, that gives out spontaneous emissions, when it is energized.
Reason (R): The recombination of holes and electrons in semiconductor materials gives off energy in terms of light and heat.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not the correct explanation of (A).
(C) (A) is true and (R) is false.
(D) (A) is false and (R) is true.
Ans: A
83. Assertion (A): Power is integration of energy over a period of time.
Reason (R): The accuracy of power measurement is dependent on integration time constant.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not the correct explanation of (A).
(C) (A) is true and (R) is false.
(D) (A) is false and (R) is true.
Ans: A
Read the following paragraph and answer the questions 84 to 86:
An operational amplifier is a direct coupled high gain amplifier with feedback. It is employed to perform a wide variety of functions such as summer, integrator, differentiator, logarithmic amplifier, oscillators, filters, comparators voltage to frequency converter, amplitude modulators, sample and hold circuit and so on.
An ideal Op-Amp has infinite input =resistance, zero output resistance, infinite voltage gain and bandwidth, zero offset and no drift. An ideal Op-Amp is a perfectly balanced ciruit such that output voltage is zero for two equal input signals. However a real Op-Amp exhibits imbalance due to mismatch at the input differential stage. It gives rise to offsets. In practical applications offsets are removed using balancing networks. In general an Op-Amp consists of the following four stages:
(1) Differential amplifier first stage
(2) Differential amplifier second stage
(3) Emitter follower
(4) Level translator and output stage It is most widely used analog device.
84. Which is a non-linear application?
(A) I-V converter
(B) Sample-and-hold
(C) Voltage follower
(D) Active filter
Ans: B
85. Analog multiplication is carried out with
(A) Scalar
(B) Precision rectifier
(C) Sample-and-hold circuit
(D) Logarithmic amplifier
Ans: D
86. Very high input resistance differential stages are used in Op-Amp
(A) To minimise input offset voltage
(B) To minimise output offset voltage
(C) To minimise input offset current
(D) To minimise output offset current
Ans: C
87. Consider the following statements regarding a semiconductor:
I. Acceptor level lies close to valence band.
II. Donor level lies close to valence band.
III. n-type semiconductor behaves as a conductor at 0 °K.
IV. p-type semiconductor behaves as an insulator at 0 °K.
(A) I and II are correct.
(B) I and III are correct.
(C) II and III are correct.
(D) I and IV are correct.
Ans: D
88. A network is said to be linear if and only if
I. Response is proportional to excitation function
II. Principle of superposition applies
III. Principle of homogeneity applies
IV. It is reciprocal
(A) Options I and II are correct.
(B) Options II and III are correct.
(C) Options III and IV are correct.
(D) Options I and IV are correct.
Ans: B
89. Which of the following statements are correct?
I. A flip – flop is used to store 1-bit =of information
II. Race-around condition occurs in a J-K flip – flop when both inputs are I.
III. A transparent latch consists of a D-type flip – flop
(A) I and II are correct.
(B) I and III are correct.
(C) I, II and III are correct.
(D) I, II and III are not correct.
Ans: C
90. Which of the following statements will store value 3 in the variable a?
I. a = 15% 4;
II. int a = (3 * 4) / (1 + 3) ;
III. int a = 3 ;
IV. int a = 6.0/2 ;
(A) Options I, II and III are correct.
(B) Options II, III and IV are correct.
(C) Options I and III are correct.
(D) Options II and IV are correct.
Ans: A
91. Indicate the false statement in the case of Armstrong modulation system.
I. The system is basically phase and frequency modulation.
II. The system is also amplitude modulation.
III. Frequency multiplication must be used.
IV. Equalization is unnecessary.
(A) I and II are correct.
(B) I, II and III are correct.
(C) I and III are correct.
(D) III and IV are correct.
Ans: C
92. DIAC is a
I. 2 terminal unidirectional switch
II. 2 terminal bi-directional switch
III. 3 layers and no gate device
IV. 4 layers and no gate device
(A) Options II and III are correct.
(B) Options II and IV are correct.
(C) Options I and III are correct.
(D) Options I and IV are correct.
Ans: B
93. In a DVM, the accuracy of the measurement depends on I. No. of A/D conversions in a second.
II. The resolution of A/D converter.
III. A statistical processing of samples and a huge memory.
IV. Speed of the processor should be high.
(A) I, II and III are to be fulfilled
(B) II, III and IV are to be fulfilled
(C) I, III and IV are to be fulfilled
(D) I, II and IV are to be fulfilled
Ans: B
An operational amplifier is a direct coupled high gain amplifier with feedback. It is employed to perform a wide variety of functions such as summer, integrator, differentiator, logarithmic amplifier, oscillators, filters, comparators voltage to frequency converter, amplitude modulators, sample and hold circuit and so on.
An ideal Op-Amp has infinite input =resistance, zero output resistance, infinite voltage gain and bandwidth, zero offset and no drift. An ideal Op-Amp is a perfectly balanced ciruit such that output voltage is zero for two equal input signals. However a real Op-Amp exhibits imbalance due to mismatch at the input differential stage. It gives rise to offsets. In practical applications offsets are removed using balancing networks. In general an Op-Amp consists of the following four stages:
(1) Differential amplifier first stage
(2) Differential amplifier second stage
(3) Emitter follower
(4) Level translator and output stage It is most widely used analog device.
84. Which is a non-linear application?
(A) I-V converter
(B) Sample-and-hold
(C) Voltage follower
(D) Active filter
Ans: B
85. Analog multiplication is carried out with
(A) Scalar
(B) Precision rectifier
(C) Sample-and-hold circuit
(D) Logarithmic amplifier
Ans: D
86. Very high input resistance differential stages are used in Op-Amp
(A) To minimise input offset voltage
(B) To minimise output offset voltage
(C) To minimise input offset current
(D) To minimise output offset current
Ans: C
87. Consider the following statements regarding a semiconductor:
I. Acceptor level lies close to valence band.
II. Donor level lies close to valence band.
III. n-type semiconductor behaves as a conductor at 0 °K.
IV. p-type semiconductor behaves as an insulator at 0 °K.
(A) I and II are correct.
(B) I and III are correct.
(C) II and III are correct.
(D) I and IV are correct.
Ans: D
88. A network is said to be linear if and only if
I. Response is proportional to excitation function
II. Principle of superposition applies
III. Principle of homogeneity applies
IV. It is reciprocal
(A) Options I and II are correct.
(B) Options II and III are correct.
(C) Options III and IV are correct.
(D) Options I and IV are correct.
Ans: B
89. Which of the following statements are correct?
I. A flip – flop is used to store 1-bit =of information
II. Race-around condition occurs in a J-K flip – flop when both inputs are I.
III. A transparent latch consists of a D-type flip – flop
(A) I and II are correct.
(B) I and III are correct.
(C) I, II and III are correct.
(D) I, II and III are not correct.
Ans: C
90. Which of the following statements will store value 3 in the variable a?
I. a = 15% 4;
II. int a = (3 * 4) / (1 + 3) ;
III. int a = 3 ;
IV. int a = 6.0/2 ;
(A) Options I, II and III are correct.
(B) Options II, III and IV are correct.
(C) Options I and III are correct.
(D) Options II and IV are correct.
Ans: A
91. Indicate the false statement in the case of Armstrong modulation system.
I. The system is basically phase and frequency modulation.
II. The system is also amplitude modulation.
III. Frequency multiplication must be used.
IV. Equalization is unnecessary.
(A) I and II are correct.
(B) I, II and III are correct.
(C) I and III are correct.
(D) III and IV are correct.
Ans: C
92. DIAC is a
I. 2 terminal unidirectional switch
II. 2 terminal bi-directional switch
III. 3 layers and no gate device
IV. 4 layers and no gate device
(A) Options II and III are correct.
(B) Options II and IV are correct.
(C) Options I and III are correct.
(D) Options I and IV are correct.
Ans: B
93. In a DVM, the accuracy of the measurement depends on I. No. of A/D conversions in a second.
II. The resolution of A/D converter.
III. A statistical processing of samples and a huge memory.
IV. Speed of the processor should be high.
(A) I, II and III are to be fulfilled
(B) II, III and IV are to be fulfilled
(C) I, III and IV are to be fulfilled
(D) I, II and IV are to be fulfilled
Ans: B
94. An AM demodulator can be implemented with
1. A linear multiplier followed by low pass filter.
2. A linear multiplier followed by high-pass filter.
3. A diode followed by low pass filter.
4. A linear multiplier followed by band-stop filter.
Which one of the following is correct?
(A) 1 only
(B) 3 only
(C) 1 and 3
(D) 4 only
Ans: C
95. NAND Gate can also be represented by
1. AND – invert Gate
2. OR – Invert Gate
3. Bubbled OR
4. Bubbled AND
Which of the following is correct?
(A) 1, 2 and 3
(B) 1 & 2
(C) 2 & 4
(D) 1 & 3
Ans: D
96. In 8085 processor,
1. AD0 – AD7 are treated as input as well as output signals.
2. HLDA is an output signal.
3. HOLD is an output signal.
4. SOD is an output signal.
(A) 1, 2 and 3 are output signals.
(B) 2, 3 and 4 are output signals.
(C) 1, 2 and 4 are output signals.
(D) 1, 3 and 4 are output signals
Ans: C
97. A variable type ‘char’ indicates the range and the no. of bytes.
1. 1 byte
2. 2 bytes
3. –127 to + 128
4. –128 to +127
(A) 1 & 3
(B) 2 & 3
(C) 1 & 4
(D) 2 & 4
Ans: C
98. The hygrometer is an instrument used to measure
1. Rainfall
2. Altitude
3. Relative humidity
4. Temperature
Which of the following is true?
(A) 1 and 2 is true.
(B) 1 and 4 is true.
(C) 3 is true.
(D) 3 and 4 is true
Ans: C
99. Hall effect can be used to measure
1. Conductivity of the charge carrier.
2. Mobility of the charge carrier.
3. The number of valence electrons per atom.
4. Band gap of the material.
Which of the following is correct?
(A) 1 and 2 are true
(B) 2 and 3 are true
(C) 3 and 4 are true
(D) 1 and 4 are true
Ans: A
100. Consider the following materials used for fabrication of Photonic Ics.
1. Ga P
2. In As
3. Ga As
4. Si
The correct sequence of the ascending order in terms of band gap energies is
(A) 1, 4, 2 and 3
(B) 4, 1, 2 and 3
(C) 2, 3, 1 and 4
(D) 2, 4, 3 and 1
Ans: D
1. A linear multiplier followed by low pass filter.
2. A linear multiplier followed by high-pass filter.
3. A diode followed by low pass filter.
4. A linear multiplier followed by band-stop filter.
Which one of the following is correct?
(A) 1 only
(B) 3 only
(C) 1 and 3
(D) 4 only
Ans: C
95. NAND Gate can also be represented by
1. AND – invert Gate
2. OR – Invert Gate
3. Bubbled OR
4. Bubbled AND
Which of the following is correct?
(A) 1, 2 and 3
(B) 1 & 2
(C) 2 & 4
(D) 1 & 3
Ans: D
96. In 8085 processor,
1. AD0 – AD7 are treated as input as well as output signals.
2. HLDA is an output signal.
3. HOLD is an output signal.
4. SOD is an output signal.
(A) 1, 2 and 3 are output signals.
(B) 2, 3 and 4 are output signals.
(C) 1, 2 and 4 are output signals.
(D) 1, 3 and 4 are output signals
Ans: C
97. A variable type ‘char’ indicates the range and the no. of bytes.
1. 1 byte
2. 2 bytes
3. –127 to + 128
4. –128 to +127
(A) 1 & 3
(B) 2 & 3
(C) 1 & 4
(D) 2 & 4
Ans: C
98. The hygrometer is an instrument used to measure
1. Rainfall
2. Altitude
3. Relative humidity
4. Temperature
Which of the following is true?
(A) 1 and 2 is true.
(B) 1 and 4 is true.
(C) 3 is true.
(D) 3 and 4 is true
Ans: C
99. Hall effect can be used to measure
1. Conductivity of the charge carrier.
2. Mobility of the charge carrier.
3. The number of valence electrons per atom.
4. Band gap of the material.
Which of the following is correct?
(A) 1 and 2 are true
(B) 2 and 3 are true
(C) 3 and 4 are true
(D) 1 and 4 are true
Ans: A
100. Consider the following materials used for fabrication of Photonic Ics.
1. Ga P
2. In As
3. Ga As
4. Si
The correct sequence of the ascending order in terms of band gap energies is
(A) 1, 4, 2 and 3
(B) 4, 1, 2 and 3
(C) 2, 3, 1 and 4
(D) 2, 4, 3 and 1
Ans: D
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