ECAT Pre General Science Physics Chapter 16 MCQ Test With Answer

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

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

Question # 2

The input resistance of the OP-AMP is the resistance between the

Question # 3

An A.C varies as a function of

Question # 4

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

Question # 5

In a transistor, if the central region is p-type then this type of transistor is known as

Question # 6

The basic circuit elements of A.C circuit are

Question # 7

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

Question # 8

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

Question # 9

If the value of C in a series RLC circuit is increased, the resonant frequency

Question # 10

The r.m.s. value of alternating current is equal to its maximum value at angle of

Question # 11

The emitter-base junction of a transistor is forward-biased and collector-base junction is reverse-biased. If the base current is increased, its

Question # 12

A diode characteristic curve is a plot between

Question # 13

The R1= infinity and R2= 0, then the gain of non-inverting amplifier is

Question # 14

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

Question # 15

Average value of A.C voltage during one cycle is

Question # 16

OP-AMP has the following input terminals

Question # 17

The closed loop gain of the inverting amplifier is written as

Question # 18

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

Question # 19

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

Question # 20

The phase angle of a series RLC circuit at resonance is

Question # 21

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

Question # 22

In free space, the speed of electromagnetic waves is

Question # 23

Transmitting antenna emits

Question # 24

Chock consumes externally small

Question # 25

When either L or C is increased, the resonant frequency of the RLC series circuit

Question # 26

For the normal operation of the transistor, its

Question # 27

The length of rotating vector (on a certain scale) represents the:

Question # 28

To design a resonant circuit of frequency 100 KHz with an inductor of inductance 5 mH, we need a capacitor of capacitance

Question # 29

Which of the following has a great concentration of impurity

Question # 30

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 Alternating current can induce voltage because it has a
A. High peak value
B. Varying magnetic field
C. Stronger field than direct curren
D. Constant magnetic field
2 In which of the following diodes when an electron combines with a hole during the forward biasing, photon of visible light is emitted.
A. photo diode
B. light emitting diode
C. photo voltaic cell
D. all of them
3 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
4 During the positive half-cycle in the half-wave rectification,the diode
A. does not conduct
B. conducts
C. either of these
D. neither of these
5 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
A. base and emitter
B. collector and emitter
C. base and collector
D. any one of these
6 The entire wave form of sinusoidal voltage is actually a set of all the:
A. Positive maximum value + Voand negative maximum value -Vo
B. Posiotive maximum value +Vo and zero
C. Zero and negative maximum value -Vo
D. Any of these
7 The Instantaneous value of alternative current maybe:
A. The same as its RMS value
B. Greater than its Rms value
C. The same as its peak value
D. Any of these
8 Which of the following has a great concentration of impurity
A. base
B. emitter
C. collector
D. none of these
9 The power factor of resonant series circuit is
A. 1
B. 0
C. -1
D. 0.5
10 The time interval during which the Voltage source changes its polarity once is known as:
A. Time period T
B. Half the time period
C. Quarter the time period
D. Two third of the time period

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