ELECTRONIC SCIENCE-PAGE 5
ELECTRONIC SCIENCE MCQs
1. Which is the correct sequence in the generation of PCM?
1. Sampling
2. Converting to PAM
3. Quantization
4. Adding of supervisory signal
5. Encoding
(A) 1, 2, 5, 3, 4
(B) 1, 5, 2, 3, 4
(C) 1, 2, 3, 5, 4
(D) 4, 5, 1, 2, 3
Ans: C
2. Consider the following logic families:
1. MOS
2. CMOS
3. DTL
4. TTL
The correct sequence of power dissipation in increasing order is given by
(A) 2, 1, 3, 4
(B) 2, 1, 4, 3
(C) 1, 2, 3, 4
(D) 1, 2, 4, 3
Ans: A
3. SCR turns off from conducting state to blocking state on
(A) Reducing gate current
(B) Reversing gate current
(C) Reducing anode current below holding current value
(D) Applying ac to the gate
Ans: C
4. The balanced modulator essentially is
(A) An oscillator
(B) A mixer
(C) A product modulator
(D) An amplifier
Ans: C
5. Which semiconductor device acts like a diode and two resistors?
(A) UJT
(B) SCR
(C) Diac
(D) Triac
Ans: A
6. Which type of analogue-to-digital converter is often used in digital voltmeter?
(A) Single slope A/D converter
(B) Dual slope A/D converter
(C) Successive approximation method
(D) Flash converter
Ans: B
7. Photoconductive devices are made of
(A) Radioactive materials
(B) Highly conductive materials
(C) Semiconductor materials
(D) Highly insulating materials
Ans: C
8. The logic gate normally used to get the carry bit in a half adder is
(A) AND
(B) EX-OR
(C) NOT
(D) OR
Ans: A
9. A counter in which all the flip-flops receive the clock pulse at the same time is known as
(A) Ripple counter
(B) Synchronous counter
(C) Clocked counter
(D) Asynchronous counter
Ans: B
10. Which of the following devices is suitable for very low power oscillator circuits only?
(A) TRAPATT diode
(B) IMPATT diode
(C) Gunn diode
(D) Tunnel diode
Ans: D
11. Thyristors can be turned off by
1. Reducing the current below the holding current value
2. Applying a negative voltage to the anode of the device
3. Reducing the gate current
Of these statements:
Codes:
(A) 1 & 2 are correct.
(B) 1 & 3 are correct.
(C) 2 & 3 are correct.
(D) 1, 2 & 3 are correct.
Ans: A
12. The 555 timer can be employed in
1. A monostable multi vibrator
2. A bistable multi vibrator
3. An astable multi vibrator
Of these statements
Codes:
(A) 1 & 2 are correct.
(B) 1 & 3 are correct.
(C) 2 & 3 are correct.
(D) 1, 2 & 3 are correct.
Ans: B
13. When a plane wave propagating through free space, the direction of the field
1. ‘E’ is perpendicular to the direction of propagation.
2. ‘H’ is perpendicular to the direction of propagation.
3. ‘E’ is perpendicular to the direction of the field ‘H’.
Codes:
(A) 1 & 2
(B) 2 & 3
(C) 1 & 3
(D) 1, 2 & 3
Ans: D
14. Consider the following statements regarding a semiconductor:
1. Acceptor level lies close to the valence band.
2. Donor level close to the valence band.
3. n-type semiconductor behaves as a conductor at zero Kelvin.
4. p-type semiconductor behaves as a insulator at zero Kelvin.
Codes:
(A) 2 & 3 are correct.
(B) 1 & 3 are correct.
(C) 1 & 4 are correct.
(D) 3 & 4 are correct.
Ans: C
15. A transducer converts
1. A potential difference is developed across a current carrying metal strip when the strip is placed in transverse magnetic field.
2. The Hall Effect is very weak in metals but large in semiconductors.
3. The Hall Effect is very weak in semiconductors but is large in metals.
4. It is applied in the measurement of the magnetic field intensity.
Codes:
(A) 1, 2 & 3 only
(B) 2 & 4 only
(C) 1, 3 & 4 only
(D) 1, 2 & 4 only
Ans: D
16. Consider the following statements:
1. Race around condition occurs in a JK flip-flop when both the inputs are one.
2. A flip-flop is used to store one bit of information.
3. A transparent latch consists in D-type in flip-flop.
4. Master-Slave configuration is used in flip-flop to store two bits of information.
Which of these statements are correct?
Codes:
(A) 1, 2 & 3 only
(B) 1, 3 & 4 only
(C) 1, 2 & 4 only
(D) 2, 3 & 4 only
Ans: A
17. Consider the following:
1. Oscillator
2. Emitter follower
3. Cascaded amplifier
4. Power amplifier
Which of these use feedback amplifiers?
(A) 1 & 2
(B) 1 & 3
(C) 2 & 4
(D) 3 & 4
Ans: A
18. Consider the following statements, regarding an Op-Amp:
1. All types of negative feedback reduce nonlinear distortion.
2. All types of negative feedback reduce the output offset voltage.
3. Non-inverting (current and voltage) feedback increases the input impedance.
4. Inverting (current and voltage) feedback decreases input impedance.
Codes:
(A) 1 only
(B) 2 & 3 only
(C) 2 & 4 only
(D) 1, 2, 3 & 4 only
Ans: D
19. If an electric field is applied to an n-type semiconductor bar, the electrons and holes move in opposite directions due to their opposite charges. The net current is
1. due to both electrons and holes with electrons as majority carriers.
2. The sum of electron and hole currents.
3. The difference between electron and hole currents.
Which of these statements is/are correct?
(A) 1 & 3
(B) 1 & 2
(C) 2 & 3
(D) 3 alone
Ans: B
20. A digital multiplexer can be used for which of the following?
1. Parallel-to-serial conversion
2. Many-to-one switch
3. To generate memory chip select
4. for code conversion
Select the correct answer using the code given below:
Codes:
(A) 1, 3 & 4
(B) 2, 3 & 4
(C) 1 & 2
(D) 2 & 3
Ans: C
21. Consider the following circuit configurations:
1. Common emitter
2. Common base
3. Emitter follower
4. Emitter follower using Darlington pairs
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
22. If the gain of an ideal amplifier decreases, the bandwidth
(A) Increases
(B) Decreases
(C) Remains zero
(D) Remains unaltered
Ans: A
23. To use as a memory, which one of the following is more suitable?
(A) Monostable multivibrator
(B) Bistable multivibrator
(C) Astable multivibrator
(D) Schmitt trigger
Ans: B
24. NAND gate is also called as
(A) Bubbled AND gate
(B) Bubbled OR gate
(C) Bubbled NOR gate
(D) Bubbled XOR gate
Ans: B
25. The INTR pin in 8086 is a
(A) Non-maskable interrupts
(B) Maskable interrupt
(C) Priority interrupts
(D) None of the above
Ans: B
1. Sampling
2. Converting to PAM
3. Quantization
4. Adding of supervisory signal
5. Encoding
(A) 1, 2, 5, 3, 4
(B) 1, 5, 2, 3, 4
(C) 1, 2, 3, 5, 4
(D) 4, 5, 1, 2, 3
Ans: C
2. Consider the following logic families:
1. MOS
2. CMOS
3. DTL
4. TTL
The correct sequence of power dissipation in increasing order is given by
(A) 2, 1, 3, 4
(B) 2, 1, 4, 3
(C) 1, 2, 3, 4
(D) 1, 2, 4, 3
Ans: A
3. SCR turns off from conducting state to blocking state on
(A) Reducing gate current
(B) Reversing gate current
(C) Reducing anode current below holding current value
(D) Applying ac to the gate
Ans: C
4. The balanced modulator essentially is
(A) An oscillator
(B) A mixer
(C) A product modulator
(D) An amplifier
Ans: C
5. Which semiconductor device acts like a diode and two resistors?
(A) UJT
(B) SCR
(C) Diac
(D) Triac
Ans: A
6. Which type of analogue-to-digital converter is often used in digital voltmeter?
(A) Single slope A/D converter
(B) Dual slope A/D converter
(C) Successive approximation method
(D) Flash converter
Ans: B
7. Photoconductive devices are made of
(A) Radioactive materials
(B) Highly conductive materials
(C) Semiconductor materials
(D) Highly insulating materials
Ans: C
8. The logic gate normally used to get the carry bit in a half adder is
(A) AND
(B) EX-OR
(C) NOT
(D) OR
Ans: A
9. A counter in which all the flip-flops receive the clock pulse at the same time is known as
(A) Ripple counter
(B) Synchronous counter
(C) Clocked counter
(D) Asynchronous counter
Ans: B
10. Which of the following devices is suitable for very low power oscillator circuits only?
(A) TRAPATT diode
(B) IMPATT diode
(C) Gunn diode
(D) Tunnel diode
Ans: D
11. Thyristors can be turned off by
1. Reducing the current below the holding current value
2. Applying a negative voltage to the anode of the device
3. Reducing the gate current
Of these statements:
Codes:
(A) 1 & 2 are correct.
(B) 1 & 3 are correct.
(C) 2 & 3 are correct.
(D) 1, 2 & 3 are correct.
Ans: A
12. The 555 timer can be employed in
1. A monostable multi vibrator
2. A bistable multi vibrator
3. An astable multi vibrator
Of these statements
Codes:
(A) 1 & 2 are correct.
(B) 1 & 3 are correct.
(C) 2 & 3 are correct.
(D) 1, 2 & 3 are correct.
Ans: B
13. When a plane wave propagating through free space, the direction of the field
1. ‘E’ is perpendicular to the direction of propagation.
2. ‘H’ is perpendicular to the direction of propagation.
3. ‘E’ is perpendicular to the direction of the field ‘H’.
Codes:
(A) 1 & 2
(B) 2 & 3
(C) 1 & 3
(D) 1, 2 & 3
Ans: D
14. Consider the following statements regarding a semiconductor:
1. Acceptor level lies close to the valence band.
2. Donor level close to the valence band.
3. n-type semiconductor behaves as a conductor at zero Kelvin.
4. p-type semiconductor behaves as a insulator at zero Kelvin.
Codes:
(A) 2 & 3 are correct.
(B) 1 & 3 are correct.
(C) 1 & 4 are correct.
(D) 3 & 4 are correct.
Ans: C
15. A transducer converts
1. A potential difference is developed across a current carrying metal strip when the strip is placed in transverse magnetic field.
2. The Hall Effect is very weak in metals but large in semiconductors.
3. The Hall Effect is very weak in semiconductors but is large in metals.
4. It is applied in the measurement of the magnetic field intensity.
Codes:
(A) 1, 2 & 3 only
(B) 2 & 4 only
(C) 1, 3 & 4 only
(D) 1, 2 & 4 only
Ans: D
16. Consider the following statements:
1. Race around condition occurs in a JK flip-flop when both the inputs are one.
2. A flip-flop is used to store one bit of information.
3. A transparent latch consists in D-type in flip-flop.
4. Master-Slave configuration is used in flip-flop to store two bits of information.
Which of these statements are correct?
Codes:
(A) 1, 2 & 3 only
(B) 1, 3 & 4 only
(C) 1, 2 & 4 only
(D) 2, 3 & 4 only
Ans: A
17. Consider the following:
1. Oscillator
2. Emitter follower
3. Cascaded amplifier
4. Power amplifier
Which of these use feedback amplifiers?
(A) 1 & 2
(B) 1 & 3
(C) 2 & 4
(D) 3 & 4
Ans: A
18. Consider the following statements, regarding an Op-Amp:
1. All types of negative feedback reduce nonlinear distortion.
2. All types of negative feedback reduce the output offset voltage.
3. Non-inverting (current and voltage) feedback increases the input impedance.
4. Inverting (current and voltage) feedback decreases input impedance.
Codes:
(A) 1 only
(B) 2 & 3 only
(C) 2 & 4 only
(D) 1, 2, 3 & 4 only
Ans: D
19. If an electric field is applied to an n-type semiconductor bar, the electrons and holes move in opposite directions due to their opposite charges. The net current is
1. due to both electrons and holes with electrons as majority carriers.
2. The sum of electron and hole currents.
3. The difference between electron and hole currents.
Which of these statements is/are correct?
(A) 1 & 3
(B) 1 & 2
(C) 2 & 3
(D) 3 alone
Ans: B
20. A digital multiplexer can be used for which of the following?
1. Parallel-to-serial conversion
2. Many-to-one switch
3. To generate memory chip select
4. for code conversion
Select the correct answer using the code given below:
Codes:
(A) 1, 3 & 4
(B) 2, 3 & 4
(C) 1 & 2
(D) 2 & 3
Ans: C
21. Consider the following circuit configurations:
1. Common emitter
2. Common base
3. Emitter follower
4. Emitter follower using Darlington pairs
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
22. If the gain of an ideal amplifier decreases, the bandwidth
(A) Increases
(B) Decreases
(C) Remains zero
(D) Remains unaltered
Ans: A
23. To use as a memory, which one of the following is more suitable?
(A) Monostable multivibrator
(B) Bistable multivibrator
(C) Astable multivibrator
(D) Schmitt trigger
Ans: B
24. NAND gate is also called as
(A) Bubbled AND gate
(B) Bubbled OR gate
(C) Bubbled NOR gate
(D) Bubbled XOR gate
Ans: B
25. The INTR pin in 8086 is a
(A) Non-maskable interrupts
(B) Maskable interrupt
(C) Priority interrupts
(D) None of the above
Ans: B
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