ELECTRONIC SCIENCE-PAGE 3
ELECTRONIC SCIENCE MCQs
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.
1. 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
2. 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 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
3. Assertion (A): UJT is used in relaxation oscillators.
Reason (R): UJT has negative resistance region in its characteristics.
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
4. Assertion (A): The race hazard problem does not occur in combinational circuits.
Reason (R): The output of a combinational circuit depends upon present inputs only.
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
5. Assertion (A): Digital communication needs some synchronisation signals.
Reason (R): ‘bit syn’ signal is required in time division multiplexing to distinguish groups of data.
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
6. Assertion (A): A reflex klystron makes use of a sinle cavity.
Reason (R): The single cavity performs the function sbuncher as well as catcher cavity.
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, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: A
7. Assertion (A): LP01 is basically HE11 mode.
Reason (R): Linearly polarised modes are strongly guided modes, in which TE and TM modes do not have identical propagation constants.
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, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: C
8. Assertion (A): Combinational circuits have no memory, timing or feedback loop.
Reason (R): The output of combinational circuit depends on their input and previous output state.
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, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: C
9. Assertion (A) Digital base band modulation is also referred to as TDM.
Reason (R): Pulse analog modulation is first step in converting analog signal to Digital Signal.
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, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: D
10. Assertion (A): Under certain conditions, one gets peak response at high frequency in transformer coupled amplifiers.
Reason (R): High frequency model of transformer coupled amplifiers is a resonant circuit.
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, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: C
11. Assertion (A): At high temperatures, the avalanche breakdown voltage of zener diode remains constant.
Reason (R): At high temperatures, mean free paths of electrons and holes are shorter, therefore a larger field is required to cause ionization.
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, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: C
12. Assertion (A): Piezoelectric transducers are not suitable for ultra-low frequency vibration measurement.
Reason (R): Piezoelectric materials have a high dielectric 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, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: A
13. Assertion (A): The contents of Random Access memory is a volatile in nature. As soon as the power is removed to the IC, the contents are erased from the memory.
Reason (R): The contents of Read only Memory are a non-volatile in nature.
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, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: B
14. Assertion (A): Logarithms are used to change a multiplication or division problem into a simpler addition and subtraction problem.
Reason (R): The Laplace transform enables the circuit analyst to convert the set of integro differential equations describing a circuit to the complex frequency domain.
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, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: B
15. Assertion (A): char str[] = “paper” ‘str’ acts as a constant pointer to a string.
Reason (R): *P = “Paper” “P” acts as a pointer to a constant string.
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, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: B
16. Assertion (A): In Intel 8085, the lower byte of address and data are multiplexed.
Reason (R): This helps not to limit the number of external pin terminals.
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: C
17. Assertion (A): In an Op-Amp circuit when one input terminal of the Op-Amp is grounded, the other terminal becomes a virtual ground.
Reason (R): Input impedance of the Op-Amp is high.
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
18. Assertion (A): The intrinsic Fermi level of a semiconductor lies exactly at the middle of the energy gap.
Reason (R): The densities of the available state in valence and conduction bands of a semiconductor are equal.
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
19. Assertion (A): The top down structured programming should be used for developing programs.
Reason (R): The top down structured programming methodology enables us to get readable and easily provable programs.
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
20. 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 the correct explanation of (A).
(C) (A) is true and (R) is false.
(D) (A) is false and (R) is true.
Ans: A
21. Assertion (A): In optical fibre communication, light rays are guided by the total internal reflection at the interface between fibre core and cladding.
Reason (R): The Refractive Index of core is large than the Refractive Index of cladding.
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
22. Assertion (A): Tunnel diode represents negative resistance characteristics and when operated in this region may be used as an oscillator.
Reason (R): Tunnel diode is heavily doped p-n junction having an extremely narrow junction which electrons are able to tunnel through it.
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
23. 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 the correct explanation of (A).
(C) (A) is true and (R) is false.
(D) (A) is false and (R) is true.
Ans: A
24. 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 the correct explanation of (A).
(C) (A) is true and (R) is false.
(D) (A) is false and (R) is true.
Ans: C
25. Assertion (A): A half-adder is faster than full-adder.
Reason (R): A 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 the correct explanation of (A).
(C) (A) is true and (R) is false.
(D) (A) is false and (R) is true.
Ans: C
1. 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
2. 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 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
3. Assertion (A): UJT is used in relaxation oscillators.
Reason (R): UJT has negative resistance region in its characteristics.
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
4. Assertion (A): The race hazard problem does not occur in combinational circuits.
Reason (R): The output of a combinational circuit depends upon present inputs only.
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
5. Assertion (A): Digital communication needs some synchronisation signals.
Reason (R): ‘bit syn’ signal is required in time division multiplexing to distinguish groups of data.
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
6. Assertion (A): A reflex klystron makes use of a sinle cavity.
Reason (R): The single cavity performs the function sbuncher as well as catcher cavity.
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, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: A
7. Assertion (A): LP01 is basically HE11 mode.
Reason (R): Linearly polarised modes are strongly guided modes, in which TE and TM modes do not have identical propagation constants.
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, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: C
8. Assertion (A): Combinational circuits have no memory, timing or feedback loop.
Reason (R): The output of combinational circuit depends on their input and previous output state.
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, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: C
9. Assertion (A) Digital base band modulation is also referred to as TDM.
Reason (R): Pulse analog modulation is first step in converting analog signal to Digital Signal.
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, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: D
10. Assertion (A): Under certain conditions, one gets peak response at high frequency in transformer coupled amplifiers.
Reason (R): High frequency model of transformer coupled amplifiers is a resonant circuit.
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, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: C
11. Assertion (A): At high temperatures, the avalanche breakdown voltage of zener diode remains constant.
Reason (R): At high temperatures, mean free paths of electrons and holes are shorter, therefore a larger field is required to cause ionization.
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, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: C
12. Assertion (A): Piezoelectric transducers are not suitable for ultra-low frequency vibration measurement.
Reason (R): Piezoelectric materials have a high dielectric 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, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: A
13. Assertion (A): The contents of Random Access memory is a volatile in nature. As soon as the power is removed to the IC, the contents are erased from the memory.
Reason (R): The contents of Read only Memory are a non-volatile in nature.
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, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: B
14. Assertion (A): Logarithms are used to change a multiplication or division problem into a simpler addition and subtraction problem.
Reason (R): The Laplace transform enables the circuit analyst to convert the set of integro differential equations describing a circuit to the complex frequency domain.
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, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: B
15. Assertion (A): char str[] = “paper” ‘str’ acts as a constant pointer to a string.
Reason (R): *P = “Paper” “P” acts as a pointer to a constant string.
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, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: B
16. Assertion (A): In Intel 8085, the lower byte of address and data are multiplexed.
Reason (R): This helps not to limit the number of external pin terminals.
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: C
17. Assertion (A): In an Op-Amp circuit when one input terminal of the Op-Amp is grounded, the other terminal becomes a virtual ground.
Reason (R): Input impedance of the Op-Amp is high.
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
18. Assertion (A): The intrinsic Fermi level of a semiconductor lies exactly at the middle of the energy gap.
Reason (R): The densities of the available state in valence and conduction bands of a semiconductor are equal.
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
19. Assertion (A): The top down structured programming should be used for developing programs.
Reason (R): The top down structured programming methodology enables us to get readable and easily provable programs.
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
20. 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 the correct explanation of (A).
(C) (A) is true and (R) is false.
(D) (A) is false and (R) is true.
Ans: A
21. Assertion (A): In optical fibre communication, light rays are guided by the total internal reflection at the interface between fibre core and cladding.
Reason (R): The Refractive Index of core is large than the Refractive Index of cladding.
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
22. Assertion (A): Tunnel diode represents negative resistance characteristics and when operated in this region may be used as an oscillator.
Reason (R): Tunnel diode is heavily doped p-n junction having an extremely narrow junction which electrons are able to tunnel through it.
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
23. 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 the correct explanation of (A).
(C) (A) is true and (R) is false.
(D) (A) is false and (R) is true.
Ans: A
24. 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 the correct explanation of (A).
(C) (A) is true and (R) is false.
(D) (A) is false and (R) is true.
Ans: C
25. Assertion (A): A half-adder is faster than full-adder.
Reason (R): A 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 the correct explanation of (A).
(C) (A) is true and (R) is false.
(D) (A) is false and (R) is true.
Ans: C
26. Match List-I with List-II and select the correct answer using codes given below:
List – I List – II
(a) Indirect band gap (i) Ga As
(b) Direct band gap (ii) Cavity
(c) Laser diode (iii) Spontaneous emission
(d) LED (iv) Si
Codes:
(a) (b) (c) (d)
(A) (ii) (i) (iii) (iv)
(B) (iii) (iv) (i) (ii)
(C) (i) (iv) (ii) (iii)
(D) (iv) (i) (ii) (iii)
Ans: D
27. Match List-I with List-II and select the correct answer using codes given below:
List – I List – II
(a) Frequency Modulation (i) Balanced Modulator
(b) Double sideband suppressed carrier (ii) Companding
(c) PCM (iii) Pre-emphasis and Deemphasis
(d) AM (iv) Envelope Detection
Codes:
(a) (b) (c) (d)
(A) (i) (ii) (iii) (iv)
(B) (iv) (iii) (ii) (i)
(C) (iii) (i) (ii) (iv)
(D) (ii) (iv) (i) (iii)
Ans: C
28. Match List-I with List-II and select the correct answer using codes given below:
List – I List – II
(a) Non-Weighted Code (i) 8421
(b) Error-Detecting Code (ii) Gray Code
(c) Weighted Code (iii) Hamming Code
(d) Error-Correcting (iv) Parity Check
Codes:
(a) (b) (c) (d)
(A) (ii) (i) (iii) (iv)
(B) (ii) (iv) (i) (iii)
(C) (i) (ii) (iii) (iv)
(D) (i) (iii) (iv) (ii)
Ans: B
29. Match List-I with List-II and select the correct answer using codes given below:
List – I List – II
(Transducers) (Measured Quantity)
(a) Capacitive transducer (i) Temperature
(b) Thermocouple (ii) Power
(c) Bourdon gauge (iii) Displacement
(d) Solar cell (iv) Pressure
Codes:
(a) (b) (c) (d)
(A) (i) (iii) (ii) (iv)
(B) (iii) (i) (iv) (ii)
(C) (ii) (iv) (i) (iii)
(D) (iv) (i) (iii) (ii)
Ans: B
30. Match List-I with List-II and select the correct answer using codes given below:
List – I List – II
(a) Voltage regulated IC (i) Figure of merit
(b) Bistable multivibrator (ii) CMRR
(c) OPAMP (iii) Capture range and locking range
(d) Phase Locked Loop (iv) flip-flop
Codes:
(a) (b) (c) (d)
(A) (i) (iii) (iv) (ii)
(B) (i) (iv) (ii) (iii)
(C) (iv) (iii) (i) (ii)
(D) (iii) (ii) (iv) (i)
Ans: B
31. Match List-I with List-II and select the correct answer using codes given below:
List – I List – II
(a) ASK (i) Uses two frequencies, mark and space.
(b) FSK (ii) Baud rate is same as bit rate.
(c) BPSK (iii) On-off keying
(d) QPSK (iv) Baud rate is half of bit rate
Codes:
(a) (b) (c) (d)
(A) (iii) (i) (ii) (iv)
(B) (ii) (iii) (i) (iv)
(C) (iii) (ii) (i) (iv)
(D) (i) (iv) (ii) (iii)
Ans: A
32. Match List-I with List-II and select the correct answer using codes given below:
List – I List – II
(a) if statement (i) case
(b) do statement (ii) return
(c) switch statement (iii) while
(d) main statement (iv) else
Codes:
(a) (b) (c) (d)
(A) (iii) (iv) (ii) (i)
(B) (iv) (iii) (ii) (i)
(C) (iii) (i) (iv) (ii)
(D) (iv) (iii) (i) (ii)
Ans: D
33. Match List-I with List-II and select the correct answer using codes given below:
List – I List – II
(Amplifier type) (Circuit/property)
(a) RC coupling (i) Higher voltage gain and impedance matching.
(b) Inductive coupling (ii) Ability to amplify dc and low frequency signal.
(c) Transformer coupling (iii) Minimum possible non-linear distortion
(d) Direct coupling (iv) Low collector supply voltages can be used.
Codes:
(a) (b) (c) (d)
(A) (iv) (i) (iii) (ii)
(B) (iii) (iv) (i) (ii)
(C) (i) (ii) (iii) (iv)
(D) (iv) (iii) (ii) (i)
Ans: D
34. Match List-I with List-II and select the correct answer using codes given below:
List – I List – II
(a) assembler (i) executes program line by line.
(b) compiler (ii) creates machine code.
(c) interpreter (iii) finds faults during execution.
(d) debugger (iv) creates object file.
Codes:
(a) (b) (c) (d)
(A) (iv) (iii) (i) (ii)
(B) (ii) (i) (iv) (iii)
(C) (ii) (iv) (i) (iii)
(D) (iii) (iv) (i) (ii)
Ans: B
List – I List – II
(a) Indirect band gap (i) Ga As
(b) Direct band gap (ii) Cavity
(c) Laser diode (iii) Spontaneous emission
(d) LED (iv) Si
Codes:
(a) (b) (c) (d)
(A) (ii) (i) (iii) (iv)
(B) (iii) (iv) (i) (ii)
(C) (i) (iv) (ii) (iii)
(D) (iv) (i) (ii) (iii)
Ans: D
27. Match List-I with List-II and select the correct answer using codes given below:
List – I List – II
(a) Frequency Modulation (i) Balanced Modulator
(b) Double sideband suppressed carrier (ii) Companding
(c) PCM (iii) Pre-emphasis and Deemphasis
(d) AM (iv) Envelope Detection
Codes:
(a) (b) (c) (d)
(A) (i) (ii) (iii) (iv)
(B) (iv) (iii) (ii) (i)
(C) (iii) (i) (ii) (iv)
(D) (ii) (iv) (i) (iii)
Ans: C
28. Match List-I with List-II and select the correct answer using codes given below:
List – I List – II
(a) Non-Weighted Code (i) 8421
(b) Error-Detecting Code (ii) Gray Code
(c) Weighted Code (iii) Hamming Code
(d) Error-Correcting (iv) Parity Check
Codes:
(a) (b) (c) (d)
(A) (ii) (i) (iii) (iv)
(B) (ii) (iv) (i) (iii)
(C) (i) (ii) (iii) (iv)
(D) (i) (iii) (iv) (ii)
Ans: B
29. Match List-I with List-II and select the correct answer using codes given below:
List – I List – II
(Transducers) (Measured Quantity)
(a) Capacitive transducer (i) Temperature
(b) Thermocouple (ii) Power
(c) Bourdon gauge (iii) Displacement
(d) Solar cell (iv) Pressure
Codes:
(a) (b) (c) (d)
(A) (i) (iii) (ii) (iv)
(B) (iii) (i) (iv) (ii)
(C) (ii) (iv) (i) (iii)
(D) (iv) (i) (iii) (ii)
Ans: B
30. Match List-I with List-II and select the correct answer using codes given below:
List – I List – II
(a) Voltage regulated IC (i) Figure of merit
(b) Bistable multivibrator (ii) CMRR
(c) OPAMP (iii) Capture range and locking range
(d) Phase Locked Loop (iv) flip-flop
Codes:
(a) (b) (c) (d)
(A) (i) (iii) (iv) (ii)
(B) (i) (iv) (ii) (iii)
(C) (iv) (iii) (i) (ii)
(D) (iii) (ii) (iv) (i)
Ans: B
31. Match List-I with List-II and select the correct answer using codes given below:
List – I List – II
(a) ASK (i) Uses two frequencies, mark and space.
(b) FSK (ii) Baud rate is same as bit rate.
(c) BPSK (iii) On-off keying
(d) QPSK (iv) Baud rate is half of bit rate
Codes:
(a) (b) (c) (d)
(A) (iii) (i) (ii) (iv)
(B) (ii) (iii) (i) (iv)
(C) (iii) (ii) (i) (iv)
(D) (i) (iv) (ii) (iii)
Ans: A
32. Match List-I with List-II and select the correct answer using codes given below:
List – I List – II
(a) if statement (i) case
(b) do statement (ii) return
(c) switch statement (iii) while
(d) main statement (iv) else
Codes:
(a) (b) (c) (d)
(A) (iii) (iv) (ii) (i)
(B) (iv) (iii) (ii) (i)
(C) (iii) (i) (iv) (ii)
(D) (iv) (iii) (i) (ii)
Ans: D
33. Match List-I with List-II and select the correct answer using codes given below:
List – I List – II
(Amplifier type) (Circuit/property)
(a) RC coupling (i) Higher voltage gain and impedance matching.
(b) Inductive coupling (ii) Ability to amplify dc and low frequency signal.
(c) Transformer coupling (iii) Minimum possible non-linear distortion
(d) Direct coupling (iv) Low collector supply voltages can be used.
Codes:
(a) (b) (c) (d)
(A) (iv) (i) (iii) (ii)
(B) (iii) (iv) (i) (ii)
(C) (i) (ii) (iii) (iv)
(D) (iv) (iii) (ii) (i)
Ans: D
34. Match List-I with List-II and select the correct answer using codes given below:
List – I List – II
(a) assembler (i) executes program line by line.
(b) compiler (ii) creates machine code.
(c) interpreter (iii) finds faults during execution.
(d) debugger (iv) creates object file.
Codes:
(a) (b) (c) (d)
(A) (iv) (iii) (i) (ii)
(B) (ii) (i) (iv) (iii)
(C) (ii) (iv) (i) (iii)
(D) (iii) (iv) (i) (ii)
Ans: B
35. Consider the following devices:
1. BJT in CB mode
2. BJT in CE mode
3. JFET
4. MOSFET
The correct sequence of these devices in increasing order of their impedance is
(A) 2, 1, 3, 4
(B) 2, 1, 4, 3
(C) 1, 2, 3, 4
(D) 1, 2, 4, 3
Ans: C
36. Semiconductor materials are made up of
(A) Metallic bond
(B) Ionic bond
(C) Vander Waal’s bond
(D) Covalent bond
Ans: D
37. A UJT has
(A) Negative resistance characteristics
(B) Low firing current
(C) Bipolar device
(D) Relax indefinitely
Ans: A
38. The current in a zener diode is controlled by
(A) zener diode resistance
(B) Potential barrier
(C) Impact ionization
(D) External circuits resistance
Ans: D
39. The ripple factor of a half-wave rectifier is found to be
(A) 1.57
(B) 1.21
(C) 1.12
(D) 1.41
Ans: B
40. Hartley oscillator is commonly used in
(A) Radio receivers
(B) Radio transmitters
(C) TV receivers
(D) Microwave transmitters
Ans: A
41. The multiplexer is also known as
(A) Counter
(B) Decoder
(C) Shift register
(D) Data selector
Ans: D
42. Quantizing Noise occurs in
(A) Time-division multiplexing
(B) Frequency-division multiplexing
(C) Pulse-Code modulation
(D) Pulse width modulation
Ans: C
43. CMRR (Common Mode Rejection Ratio) for a differential amplifier should be
(A) Zero
(B) Unity
(C) Small
(D) Large
Ans: D
44. An ideal op-amp has
(A) Infinite common mode gain as well as differential gain.
(B) Infinite common mode gain and zero differential gain.
(C) Infinite differential gain and zero common mode gain.
(D) Zero differential gain and infinite common mode gain.
Ans: C
45. In 8085, example for Non-maskable interrupts is
(A) Trap
(B) RST 6.5
(C) INTR
(D) RSTO
Ans: A
46. The pH is a measure of
(A) Acidity
(B) Density
(C) Specific density
(D) Solubility
Ans: A
47. To separate channels in an FDM receiver, it is necessary to use
(A) Integration
(B) Band pass filter
(C) Differentiation
(D) AND gates
Ans: B
48. Time-Division Multiplex
(A) Can be used with PAM only
(B) Combines five groups into a super group
(C) Stacks 24 channels in adjacent frequency slots
(D) Interleaves pulses in time domain belonging to different transmissions
Ans: D
49. In Half Duplex (HDX), data transmission is possible
(A) In one direction
(B) In both direction
(C) In both direction, but not at the same time
(D) In both direction simultaneously
Ans: C
50. Indicate which of the following system is digital?
(A) Pulse – Position Modulation
(B) Pulse – Code Modulation
(C) Pulse – Width Modulation
(D) Pulse – Amplitude Modulation
Ans: B
1. BJT in CB mode
2. BJT in CE mode
3. JFET
4. MOSFET
The correct sequence of these devices in increasing order of their impedance is
(A) 2, 1, 3, 4
(B) 2, 1, 4, 3
(C) 1, 2, 3, 4
(D) 1, 2, 4, 3
Ans: C
36. Semiconductor materials are made up of
(A) Metallic bond
(B) Ionic bond
(C) Vander Waal’s bond
(D) Covalent bond
Ans: D
37. A UJT has
(A) Negative resistance characteristics
(B) Low firing current
(C) Bipolar device
(D) Relax indefinitely
Ans: A
38. The current in a zener diode is controlled by
(A) zener diode resistance
(B) Potential barrier
(C) Impact ionization
(D) External circuits resistance
Ans: D
39. The ripple factor of a half-wave rectifier is found to be
(A) 1.57
(B) 1.21
(C) 1.12
(D) 1.41
Ans: B
40. Hartley oscillator is commonly used in
(A) Radio receivers
(B) Radio transmitters
(C) TV receivers
(D) Microwave transmitters
Ans: A
41. The multiplexer is also known as
(A) Counter
(B) Decoder
(C) Shift register
(D) Data selector
Ans: D
42. Quantizing Noise occurs in
(A) Time-division multiplexing
(B) Frequency-division multiplexing
(C) Pulse-Code modulation
(D) Pulse width modulation
Ans: C
43. CMRR (Common Mode Rejection Ratio) for a differential amplifier should be
(A) Zero
(B) Unity
(C) Small
(D) Large
Ans: D
44. An ideal op-amp has
(A) Infinite common mode gain as well as differential gain.
(B) Infinite common mode gain and zero differential gain.
(C) Infinite differential gain and zero common mode gain.
(D) Zero differential gain and infinite common mode gain.
Ans: C
45. In 8085, example for Non-maskable interrupts is
(A) Trap
(B) RST 6.5
(C) INTR
(D) RSTO
Ans: A
46. The pH is a measure of
(A) Acidity
(B) Density
(C) Specific density
(D) Solubility
Ans: A
47. To separate channels in an FDM receiver, it is necessary to use
(A) Integration
(B) Band pass filter
(C) Differentiation
(D) AND gates
Ans: B
48. Time-Division Multiplex
(A) Can be used with PAM only
(B) Combines five groups into a super group
(C) Stacks 24 channels in adjacent frequency slots
(D) Interleaves pulses in time domain belonging to different transmissions
Ans: D
49. In Half Duplex (HDX), data transmission is possible
(A) In one direction
(B) In both direction
(C) In both direction, but not at the same time
(D) In both direction simultaneously
Ans: C
50. Indicate which of the following system is digital?
(A) Pulse – Position Modulation
(B) Pulse – Code Modulation
(C) Pulse – Width Modulation
(D) Pulse – Amplitude Modulation
Ans: B
1. The value of Numerical Aperture in optical fibre is
(A) Greater than 1
(B) Less than 1
(C) Equal to 1
(D) Equal to ∞
Ans: B
52. In 8085, microprocessor, the register which holds the address of the next instruction to be executed is
(A) Instruction registers
(B) Stack pointer
(C) Temporary register
(D) Program counter
Ans: D
53. Arrange the following in order of decreasing frequency:
1. C band
2. X band
3. Ku band
4. K band
Codes:
(A) 1, 2, 3, 4
(B) 2, 3, 4, 1
(C) 1, 4, 3, 2
(D) 4, 3, 2, 1
Ans: D
54. Consider the following cables:
1. Single mode optical fibre cable
2. Multimode optical fibre cable
3. Graded-index optical fibre cable
4. Co-axial cable
The correct sequence in increasing order of data rate is
(A) 1, 2, 3, 4
(B) 4, 2, 3, 1
(C) 1, 2, 4, 3
(D) 4, 3, 2, 1
Ans: B
55. The interrupts in 8085 processor are
1. RST 7.5
2. RST 6.5
3. RST 5.5
4. TRAP
Keep the sequence from least priority to highest priority
(A) 1, 2, 3, 4
(B) 4, 3, 2, 1
(C) 3, 2, 1, 4
(D) 1, 4, 3, 2
Ans: C
56. Consider the following frequency spectrum of the electro-magnetic wave:
1. FM radio waves
2. Microwaves
3. Visible range
4. X-ray
Write down the frequency spectrum in ascending order
(A) 4, 3, 2, 1
(B) 1, 3, 2, 4
(C) 3, 2, 4, 1
(D) 1, 2, 3, 4
Ans: D
57. Consider the following logic families:
1. MOS
2. TTL
3. RTL
4. ECL
The sequence of these logic families in the order of their increasing propagation delay is
(A) 1, 2, 3, 4
(B) 4, 2, 3, 1
(C) 2, 1, 3, 4
(D) 4, 3, 2, 1
Ans: B
58. Consider the following steps:
1. Etching
2. Exposure to UV radiation
3. Stripping
4. Developing
After a wafer has been coated with photo-resist, the correct sequence of these steps in photolithography is
(A) 1, 4, 2, 3
(B) 2, 4, 1, 3
(C) 2, 1, 3, 4
(D) 1, 3, 2, 4
Ans: B
59. The following microprocessor operations are part of interrupt cycle of a control unit:
1. MAR ← Save-address
2. PC ← Routine-address
3. MBR ← (PC)
4. Memory ← MBR
Which of the following is the correct order of their occurrence?
(A) 1, 2, 3
(B) 3, 4, 2
(C) 2, 3, 4
(D) 4, 3, 1
Ans: A
60. Consider the following logic families:
1. RTL
2. DTL
3. TTL
4. ECL
The sequence of these logic families in the order of their decreasing Fan-Out is
(A) 1, 2, 3, 4
(B) 2, 1, 3, 4
(C) 4, 3, 2, 1
(D) 3, 4, 2, 1
Ans: C
61. Match the following:
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
62. 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 de-emphasis
Codes:
a b c d
(A) i ii iii iv
(B) ii iii i iv
(C) iii i ii iv
(D) iv iii ii i
Ans: D
63. List – I List – II
a. Astable multivibrator i. Two-stable states
b. Bistable multivibrator ii. Free running oscillator
c. Monostable multivibrator iii. One-stable state
d. Schmitt triggers iv. Square wave generator
Codes:
a b c d
(A) i iii iv ii
(B) iii iv i ii
(C) ii i iii iv
(D) ii i iv iii
Ans: C
64. List – I List – II
a. Gunn diode i. Junction less device
b. Solar cell ii. Single junction device
c. MOSFET iii. Triple junction device
d. SCR iv. Double junction device
Codes:
a b c d
(A) i iii ii iv
(B) i ii iv iii
(C) ii iv iii i
(D) i iii iv ii
Ans: B
65. List – I List – II
a. Capacitive transducer i. Pressure
b. Thermocouple ii. Torque
c. Load cell iii. Displacement
d. Diaphragm iv. Temperature
Codes:
a b c d
(A) ii iv iii i
(B) iii i ii iv
(C) ii i iii iv
(D) iii iv ii i
Ans: D
66. 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
67. List – I List – II
a. Immediate addressing i. LDA 30 FF
b. Implied addressing ii. MOV A, B
c. Register addressing iii. LXI H, 2050
d. Direct addressing iv. RRC
Codes:
a b c d
(A) iii iv ii i
(B) ii i iii iv
(C) iii i ii iv
(D) ii iv iii i
Ans: A
68. List – I List – II
a. Simplex i. Bidirectional at same time but not between same two points
b. Half Duplex (HDX) ii. Bidirectional and at same time between same two points
c. Full Duplex (FDX) iii. Bidirectional but not at same time
d. Full/Full Duplex (F/FDX) iv. Unidirectional
Codes:
a b c d
(A) iv iii ii i
(B) iii ii i iv
(C) i ii iii iv
(D) ii iii iv i
Ans: A
69. List – I List – II
a. Drift current i. Law of Conservation of Charge
b. Einstein’s equation ii. Electric field
c. Diffusion current iii. Thermal voltage
d. Continuity equation iv. Concentration gradient
Codes:
a b c d
(A) ii i iv iii
(B) iv iii ii i
(C) i ii iii iv
(D) iv ii iii i
Ans: A
70. List – I List – II
a. PN Diode I . Oscillator
b. LED ii. Light emitter
c. PIN Diode iii. Rectifier diode
d. Tunnel diode iv. Light detector
Codes:
a b c d
(A) i ii iii iv
(B) ii iii i iv
(C) iii ii iv i
(D) ii iv iii i
Ans: C
71. The p-n junction diode is a
(A) Passive device
(B) Vacuum device
(C) Unilateral device
(D) Bilateral device
Ans: C
72. A semiconductor has ______ temperature co-efficient of resistance
(A) Zero
(B) Positive
(C) Negative
(D) One
Ans: C
73. A JFET has
(A) One built-in diode
(B) Two built-in diode
(C) Three built-in diode
(D) Four built-in diode
Ans: B
74. The superposition theorem is essentially based on the concept of
(A) Quality
(B) Linearity
(C) Reciprocity
(D) Non-linearity
Ans: B
75. A counter that counts in binary from 0000 to 1010 is known as
(A) Binary counter
(B) Decade counter
(C) BCD counters
(D) Mod-10 counter
Ans: A
76. A digital multiplexer is a/an
(A) Combinational circuit
(B) Sequential circuit
(C) Amplifier
(D) Memory device
Ans: A
(A) Greater than 1
(B) Less than 1
(C) Equal to 1
(D) Equal to ∞
Ans: B
52. In 8085, microprocessor, the register which holds the address of the next instruction to be executed is
(A) Instruction registers
(B) Stack pointer
(C) Temporary register
(D) Program counter
Ans: D
53. Arrange the following in order of decreasing frequency:
1. C band
2. X band
3. Ku band
4. K band
Codes:
(A) 1, 2, 3, 4
(B) 2, 3, 4, 1
(C) 1, 4, 3, 2
(D) 4, 3, 2, 1
Ans: D
54. Consider the following cables:
1. Single mode optical fibre cable
2. Multimode optical fibre cable
3. Graded-index optical fibre cable
4. Co-axial cable
The correct sequence in increasing order of data rate is
(A) 1, 2, 3, 4
(B) 4, 2, 3, 1
(C) 1, 2, 4, 3
(D) 4, 3, 2, 1
Ans: B
55. The interrupts in 8085 processor are
1. RST 7.5
2. RST 6.5
3. RST 5.5
4. TRAP
Keep the sequence from least priority to highest priority
(A) 1, 2, 3, 4
(B) 4, 3, 2, 1
(C) 3, 2, 1, 4
(D) 1, 4, 3, 2
Ans: C
56. Consider the following frequency spectrum of the electro-magnetic wave:
1. FM radio waves
2. Microwaves
3. Visible range
4. X-ray
Write down the frequency spectrum in ascending order
(A) 4, 3, 2, 1
(B) 1, 3, 2, 4
(C) 3, 2, 4, 1
(D) 1, 2, 3, 4
Ans: D
57. Consider the following logic families:
1. MOS
2. TTL
3. RTL
4. ECL
The sequence of these logic families in the order of their increasing propagation delay is
(A) 1, 2, 3, 4
(B) 4, 2, 3, 1
(C) 2, 1, 3, 4
(D) 4, 3, 2, 1
Ans: B
58. Consider the following steps:
1. Etching
2. Exposure to UV radiation
3. Stripping
4. Developing
After a wafer has been coated with photo-resist, the correct sequence of these steps in photolithography is
(A) 1, 4, 2, 3
(B) 2, 4, 1, 3
(C) 2, 1, 3, 4
(D) 1, 3, 2, 4
Ans: B
59. The following microprocessor operations are part of interrupt cycle of a control unit:
1. MAR ← Save-address
2. PC ← Routine-address
3. MBR ← (PC)
4. Memory ← MBR
Which of the following is the correct order of their occurrence?
(A) 1, 2, 3
(B) 3, 4, 2
(C) 2, 3, 4
(D) 4, 3, 1
Ans: A
60. Consider the following logic families:
1. RTL
2. DTL
3. TTL
4. ECL
The sequence of these logic families in the order of their decreasing Fan-Out is
(A) 1, 2, 3, 4
(B) 2, 1, 3, 4
(C) 4, 3, 2, 1
(D) 3, 4, 2, 1
Ans: C
61. Match the following:
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
62. 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 de-emphasis
Codes:
a b c d
(A) i ii iii iv
(B) ii iii i iv
(C) iii i ii iv
(D) iv iii ii i
Ans: D
63. List – I List – II
a. Astable multivibrator i. Two-stable states
b. Bistable multivibrator ii. Free running oscillator
c. Monostable multivibrator iii. One-stable state
d. Schmitt triggers iv. Square wave generator
Codes:
a b c d
(A) i iii iv ii
(B) iii iv i ii
(C) ii i iii iv
(D) ii i iv iii
Ans: C
64. List – I List – II
a. Gunn diode i. Junction less device
b. Solar cell ii. Single junction device
c. MOSFET iii. Triple junction device
d. SCR iv. Double junction device
Codes:
a b c d
(A) i iii ii iv
(B) i ii iv iii
(C) ii iv iii i
(D) i iii iv ii
Ans: B
65. List – I List – II
a. Capacitive transducer i. Pressure
b. Thermocouple ii. Torque
c. Load cell iii. Displacement
d. Diaphragm iv. Temperature
Codes:
a b c d
(A) ii iv iii i
(B) iii i ii iv
(C) ii i iii iv
(D) iii iv ii i
Ans: D
66. 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
67. List – I List – II
a. Immediate addressing i. LDA 30 FF
b. Implied addressing ii. MOV A, B
c. Register addressing iii. LXI H, 2050
d. Direct addressing iv. RRC
Codes:
a b c d
(A) iii iv ii i
(B) ii i iii iv
(C) iii i ii iv
(D) ii iv iii i
Ans: A
68. List – I List – II
a. Simplex i. Bidirectional at same time but not between same two points
b. Half Duplex (HDX) ii. Bidirectional and at same time between same two points
c. Full Duplex (FDX) iii. Bidirectional but not at same time
d. Full/Full Duplex (F/FDX) iv. Unidirectional
Codes:
a b c d
(A) iv iii ii i
(B) iii ii i iv
(C) i ii iii iv
(D) ii iii iv i
Ans: A
69. List – I List – II
a. Drift current i. Law of Conservation of Charge
b. Einstein’s equation ii. Electric field
c. Diffusion current iii. Thermal voltage
d. Continuity equation iv. Concentration gradient
Codes:
a b c d
(A) ii i iv iii
(B) iv iii ii i
(C) i ii iii iv
(D) iv ii iii i
Ans: A
70. List – I List – II
a. PN Diode I . Oscillator
b. LED ii. Light emitter
c. PIN Diode iii. Rectifier diode
d. Tunnel diode iv. Light detector
Codes:
a b c d
(A) i ii iii iv
(B) ii iii i iv
(C) iii ii iv i
(D) ii iv iii i
Ans: C
71. The p-n junction diode is a
(A) Passive device
(B) Vacuum device
(C) Unilateral device
(D) Bilateral device
Ans: C
72. A semiconductor has ______ temperature co-efficient of resistance
(A) Zero
(B) Positive
(C) Negative
(D) One
Ans: C
73. A JFET has
(A) One built-in diode
(B) Two built-in diode
(C) Three built-in diode
(D) Four built-in diode
Ans: B
74. The superposition theorem is essentially based on the concept of
(A) Quality
(B) Linearity
(C) Reciprocity
(D) Non-linearity
Ans: B
75. A counter that counts in binary from 0000 to 1010 is known as
(A) Binary counter
(B) Decade counter
(C) BCD counters
(D) Mod-10 counter
Ans: A
76. A digital multiplexer is a/an
(A) Combinational circuit
(B) Sequential circuit
(C) Amplifier
(D) Memory device
Ans: A
77. Which logic function has the output low only when both inputs are high?
(A) NOR
(B) OR
(C) AND
(D) NAND
Ans: D
78. In FM, when frequency deviation doubled, then
(A) Modulation Index is decreased
(B) Modulation Index is doubled
(C) Modulation Index halved
(D) No change occurs in modulation index values
Ans: B
79. Out of the following memory types, one that is volatile is
(A) Magnetic disc
(B) Ferrite core
(C) Semiconductor ROM
(D) Semiconductor RAM
Ans: D
80. An SCR can be formed by using
(A) 2 npn transistors
(B) 2 pnp transistors
(C) 1 npn and 1 pnp transistor
(D) 2 pn diode
Ans: C
81. The pH of human blood is between
(A) 6.5 to 7
(B) 7.5 to 8
(C) 8 to 9
(D) 4.5 to 5
Ans: B
82. What is SIM?
(A) Select Interrupt Mask
(B) Sorting Interrupt Mask
(C) Set Interrupt Mask
(D) Start Instruction Mode
Ans: C
83. Quantization noise occurs in
(A) TDM
(B) PCM
(C) FDM
(D) WDM
Ans: B
84. Which antenna gets circularly polarized?
(A) Yagi-Uda
(B) Dipole
(C) Parabolic
(D) Helical
Ans: D
85. VSWR (Voltage Standing Wave Ratio) is always
(A) More than 1
(B) Less than 1
(C) 1
(D) 0.4
Ans: A
86. The ladder network used in D/A converter is
(A) Weighted resistance ladder
(B) R – R ladder
(C) R – 2R ladder
(D) R – C ladder
Ans: C
87. Out of the following memory types, one that is volatile is
(A) Magnetic disc
(B) Ferrite core
(C) Semiconductor ROM
(D) Semiconductor RAM
Ans: D
88. When Q of an antenna increases, the bandwidth
(A) Increases
(B) Decreases
(C) Stays constant equal to zero
(D) Stays constant equal to unity
Ans: D
89. The value of intrinsic-stand-off ratio of UJT should be
(A) >1
(B) <1
(C) 0 (zero)
(D) 10
Ans: B
90. In a normal ECG waveform which wave has the maximum amplitude?
(A) P wave
(B) R wave
(C) Q wave
(D) T wave
Ans: B
91. The output impedance in an ideal Op-Amp is
(A) Zero
(B) 20 Ω
(C) 60 Ω
(D) Infinity
Ans: A
92. Step down regulator produces an output
(A) Low voltage and low current
(B) Low voltage at high current
(C) High voltage at low current
(D) High voltage at high current
Ans: B
93. The time base of a CRO is controlled by
(A) Square waveform
(B) Sine waveform
(C) Saw tooth waveform
(D) Staircase waveform
Ans: C
94. Routh Hurwitz criterion gives
(A) Phase-details
(B) Marginal stability
(C) Relative stability
(D) Absolute stability
Ans: D
95. Photo diode is reverse biased because
(A) Only one side is illuminated
(B) Majority carriers flow under these conditions.
(C) Reverse current is small as compared to photo current
(D) Reverse current is large as compared to photo current
Ans: C
96. For PCM, the bandwidth required to transmit a voice channel is
(A) 20 KHz
(B) 5 KHz
(C) 64 MHz
(D) 64 KHz
Ans: D
97. In SCR’s snubber circuits employ
(A) Inductor only
(B) A combination of R and L
(C) A combination of R and C
(D) Resistance only
Ans: C
98. In optical fiber communication systems, FBG is used for
(A) Dispersion compensation
(B) Long haul communication
(C) Non-linearity management
(D) Source
Ans: A
99. A multiplexer :
(i) Selects one of the several inputs and transmits to a single output.
(ii) Routes the data from a single input to one of many outputs.
(iii) Converts parallel data into serial data.
(iv) It is a combinational circuit.
Which one of the following is correct?
(A) (i), (ii) & (iv)
(B) (ii), (iii) & (iv)
(C) (i), (iii) & (iv)
(D) (i), (ii) & (iii)
Ans: C
100. Audio signals are not transmitted by EM waves because
(i) Antennas used will be unimaginably lengthy
(ii) Audio signals do not radiate
(iii) Interference is due to simultaneous transmissions.
(iv) Usable frequency range is too low and narrow.
Which of the following is correct?
(A) (i) & (ii)
(B) (ii) & (iii)
(C) (i) & (iii)
(D) (i), (iii) & (iv)
Ans: C
(A) NOR
(B) OR
(C) AND
(D) NAND
Ans: D
78. In FM, when frequency deviation doubled, then
(A) Modulation Index is decreased
(B) Modulation Index is doubled
(C) Modulation Index halved
(D) No change occurs in modulation index values
Ans: B
79. Out of the following memory types, one that is volatile is
(A) Magnetic disc
(B) Ferrite core
(C) Semiconductor ROM
(D) Semiconductor RAM
Ans: D
80. An SCR can be formed by using
(A) 2 npn transistors
(B) 2 pnp transistors
(C) 1 npn and 1 pnp transistor
(D) 2 pn diode
Ans: C
81. The pH of human blood is between
(A) 6.5 to 7
(B) 7.5 to 8
(C) 8 to 9
(D) 4.5 to 5
Ans: B
82. What is SIM?
(A) Select Interrupt Mask
(B) Sorting Interrupt Mask
(C) Set Interrupt Mask
(D) Start Instruction Mode
Ans: C
83. Quantization noise occurs in
(A) TDM
(B) PCM
(C) FDM
(D) WDM
Ans: B
84. Which antenna gets circularly polarized?
(A) Yagi-Uda
(B) Dipole
(C) Parabolic
(D) Helical
Ans: D
85. VSWR (Voltage Standing Wave Ratio) is always
(A) More than 1
(B) Less than 1
(C) 1
(D) 0.4
Ans: A
86. The ladder network used in D/A converter is
(A) Weighted resistance ladder
(B) R – R ladder
(C) R – 2R ladder
(D) R – C ladder
Ans: C
87. Out of the following memory types, one that is volatile is
(A) Magnetic disc
(B) Ferrite core
(C) Semiconductor ROM
(D) Semiconductor RAM
Ans: D
88. When Q of an antenna increases, the bandwidth
(A) Increases
(B) Decreases
(C) Stays constant equal to zero
(D) Stays constant equal to unity
Ans: D
89. The value of intrinsic-stand-off ratio of UJT should be
(A) >1
(B) <1
(C) 0 (zero)
(D) 10
Ans: B
90. In a normal ECG waveform which wave has the maximum amplitude?
(A) P wave
(B) R wave
(C) Q wave
(D) T wave
Ans: B
91. The output impedance in an ideal Op-Amp is
(A) Zero
(B) 20 Ω
(C) 60 Ω
(D) Infinity
Ans: A
92. Step down regulator produces an output
(A) Low voltage and low current
(B) Low voltage at high current
(C) High voltage at low current
(D) High voltage at high current
Ans: B
93. The time base of a CRO is controlled by
(A) Square waveform
(B) Sine waveform
(C) Saw tooth waveform
(D) Staircase waveform
Ans: C
94. Routh Hurwitz criterion gives
(A) Phase-details
(B) Marginal stability
(C) Relative stability
(D) Absolute stability
Ans: D
95. Photo diode is reverse biased because
(A) Only one side is illuminated
(B) Majority carriers flow under these conditions.
(C) Reverse current is small as compared to photo current
(D) Reverse current is large as compared to photo current
Ans: C
96. For PCM, the bandwidth required to transmit a voice channel is
(A) 20 KHz
(B) 5 KHz
(C) 64 MHz
(D) 64 KHz
Ans: D
97. In SCR’s snubber circuits employ
(A) Inductor only
(B) A combination of R and L
(C) A combination of R and C
(D) Resistance only
Ans: C
98. In optical fiber communication systems, FBG is used for
(A) Dispersion compensation
(B) Long haul communication
(C) Non-linearity management
(D) Source
Ans: A
99. A multiplexer :
(i) Selects one of the several inputs and transmits to a single output.
(ii) Routes the data from a single input to one of many outputs.
(iii) Converts parallel data into serial data.
(iv) It is a combinational circuit.
Which one of the following is correct?
(A) (i), (ii) & (iv)
(B) (ii), (iii) & (iv)
(C) (i), (iii) & (iv)
(D) (i), (ii) & (iii)
Ans: C
100. Audio signals are not transmitted by EM waves because
(i) Antennas used will be unimaginably lengthy
(ii) Audio signals do not radiate
(iii) Interference is due to simultaneous transmissions.
(iv) Usable frequency range is too low and narrow.
Which of the following is correct?
(A) (i) & (ii)
(B) (ii) & (iii)
(C) (i) & (iii)
(D) (i), (iii) & (iv)
Ans: C
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