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

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

Question # 2

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

Question # 3

The sum of positive and negative peak values is called:

Question # 4

Most OP-AMP operates with

Question # 5

Due to the high value of the input resistance, practically, the value of the current which flows between the input terminals is

Question # 6

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

Question # 7

In which of the following components, pn-junction is used

Question # 8

Conversion of alternating current into direct current is called

Question # 9

In a normally biased n-p-n transistor, an electron c current IEflows from the

Question # 10

The basic circuit element in A.C. circuits are:

Question # 11

The closed loop gain of the inverting amplifier is written as

Question # 12

At higher frequency of the alternating current, the capacitive reactance Xc

Question # 13

If we connected the ordinary DC ammeter to measure alternating current, it would measure its:

Question # 14

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

Question # 15

A P-N juction or semiconductor diode cannot be used as

Question # 16

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

Question # 17

In which of the following diodes when an electron combines with a hole during the forward biasing, photon of visible light is emitted.

Question # 18

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

Question # 19

The total reactance of a series RLC circuit at resonance is

Question # 20

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

Question # 21

During the negative half-cycle of the half-wave rectification, the diode

Question # 22

Alternating current is produced by a voltage source which polarity:

Question # 23

The average of A.C. current and voltage over a complete cycle is

Question # 24

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 # 25

The wave form of alternating voltage is the graph between:

Question # 26

For a n-p-n transistor, the conventional current equation can be written as

Question # 27

Peak value of alternative current is:

Question # 28

Average value of A.C voltage during one cycle is

Question # 29

The basic circuit element in D.C. circuit is:

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 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
2 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)
3 The input resistance of the OP-AMP is the resistance between the
A. (-) input and output
B. (+) input and output
C. (-) and (+) inputs
D. between any inputs
4 In a transistor, if the central region is p-type then this type of transistor is known as
A. p-n-p transistor
B. n-p-n transistor
C. either of these
D. none of these
5 The magnitude of alternative voltage V:
A. Always increase
B. Always decrease
C. Remains constant
D. Does not remain constant
6 When the p-n junction is forward biased its resistance is of the order of
A. few mega ohms
B. few kilo ohms
C. few ohms
D. few milli ohms
7 The bridge circuit of full wave rectification uses
A. one diode
B. two diode
C. three diode
D. four diode
8 The value of the potential difference across the depletion region for the case of germanium is
A. 0.3 V
B. 0.5 V
C. 0.7 V
D. 0.9 V
9 The open loop gain of OP-AMP is of the order of
A. 102
B. 103
C. 104
D. 105
10 In an A.C circuit with resistor only, the current and voltage have a phase angle of
A. 90°
B. 0°
C. 180°
D. none of these

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