ECAT Pre General Science Physics Chapter 16 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 16 Alternating Current

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ECAT Pre General Science Physics Chapter 16 Alternating Current

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Question # 1

OP-AMP has the following input terminals

Question # 2

The phase at the positive peak of an A.C. cycle is:

Question # 3

When the p-n junction is forward biased its resistance is of the order of

Question # 4

The RMS value of alternating current is:

Question # 5

The closed loop gain of the non-inverting amplifier is given by

Question # 6

The highest value reached by the voltage or current:

Question # 7

In n-p-n transistor, emitter base junction is kept

Question # 8

If we connect a A.C. volt meter to read A.C. voltage, It would read its:

Question # 9

The power factor of resonant series circuit is

Question # 10

The value of the potential difference across the depletion region for the case of germanium is

Question # 11

An A.C. voltage is applied across the inductor. When the frequency of the voltage is increased, the current

Question # 12

When a transistor is used as a switch the circuit in which the current is to be switched OFF and ON, is connected between the

Question # 13

When the pn-junction is forward biased. the current flows through it is of the order of

Question # 14

The basic circuit elements of A.C circuit are

Question # 15

When the pn-junction is in reversed biased, current flows through the junction due to the

Question # 16

In a transistor, the central region is called

Question # 17

If 250V is the RMS value of alternative voltage, then its peak value Vowill be:

Question # 18

The value of current gain of n-p-n transistor is of the order of

Question # 19

The total reactance of a series RLC circuit at resonance is

Question # 20

The wave form of alternating voltage is the graph between:

Question # 21

The sum of positive and negative peak values is called:

Question # 22

At resonance, the phase angle for RLC series resonance circuit equals

Question # 23

In RLC series circuit, resonance occurs when

Question # 24

At resonance, the impedance of RLC series circuit is

Question # 25

When electrons in the transmitting antenna vibrate 94000 time per second, they produce radiowaves having frequency

Question # 26

During the positive half-cycle in the half-wave rectification,the diode

Question # 27

A signal is amplified at the output without any change of phase, if it is applied at the

Question # 28

Alternating current is produced by a voltage source which polarity:

Question # 29

Which of the following diodes can operate in the reverse biased condition

Question # 30

For the normal operation of the transistor, its

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 Conversion of alternating current into direct current is called
A. amplification
B. rectification
C. conduction
D. polarization
2 The device which allows only the flow of an A.C. through a circuit is
A. Capacitor
B. Inductor
C. D.C. motor
D. Battery
3 If we connect a A.C. volt meter to read A.C. voltage, It would read its:
A. RMS value
B. Instantaneous value
C. Valued average over a cycle
D. Zero
4 Due to the high value of the input resistance, practically, the value of the current which flows between the input terminals is
A. zero
B. small
C. large
D. very large
5 A P-N juction or semiconductor diode cannot be used as
A. A rectifier
B. Detector
C. Oscillator
D. An amplifier
6 Nowadays, Most of the electric energy is produced by the A.C. generators using:
A. Hydal water
B. Geothermal energy
C. Solar energy
D. Biomass
7 A p-n junction is formed when a crystal of silicon is growth in such a way that its one half is doped with trivalent impurity and the other half with a impurity from
A. 2nd group
B. fourth group
C. fifth group
D. sixth group
8 At resonance frequency the impedance of parallel resonance circuit is
A. Maximum
B. Minimum
C. Zero
D. None of the above
9 Which of the following diode is used to derive the current in external circuit when light is incident in the circuit
A. photo diode
B. light emitting diode
C. photo voltaic cell
D. none of these
10 The length of rotating vector (on a certain scale) represents the:
A. Peak value of alternating quantity
B. RMS value of alternating quantity
C. Instantaneous value of alternating quantity
D. Either (B) or (C)

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