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

Question # 2

The phase angle of a series RLC circuit at resonance is

Question # 3

The RMS value of alternating current is:

Question # 4

Alternating current is produced by a voltage source which polarity:

Question # 5

Most OP-AMP operates with

Question # 6

For normal operation of transistor, the batteries

Question # 7

Electromagnetic waves transmit energy equal to

Question # 8

Which of the following diode is used to derive the current in external circuit when light is incident in the circuit

Question # 9

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

Question # 10

The total reactance of a series RLC circuit at resonance is

Question # 11

An A.C varies as a function of

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

The circuit which is used to smooth the output voltage of the full-wave rectification is known as

Question # 14

In free space, the speed of electromagnetic waves is

Question # 15

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

Question # 16

For the normal operation of the transistor, its

Question # 17

Which of the following diode is used for the detection of light

Question # 18

The value of the input resistance of OP-AMP is of the order of

Question # 19

An A.C. voltmeter read 250 volts. The frequency of alternating is 50 Hz, the peak value of voltage is

Question # 20

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

Question # 21

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 # 22

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

Question # 23

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

Question # 24

The time interval during which the Voltage source changes its polarity once is known as:

Question # 25

During each cycle, alternating voltage reaches a peak value

Question # 26

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

Question # 27

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

Question # 28

Which of the following has a great concentration of impurity

Question # 29

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

Question # 30

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 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
2 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
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 The basic circuit element in D.C. circuit is:
A. A capacitor
B. A resistor
C. An inductor
D. Both (A) and (C)
5 For a n-p-n transistor, the conventional current equation can be written as
A. IE+ IC= IB
B. IC- IB= IE
C. IC+ IB= IE
D. IB+ IE= IC
6 The closed loop gain of the non-inverting amplifier is given by
A. G = R2/R1
B. G = -R2/R1
C. G = 1 - R2/R1
D. G = 1 + T2/R1
7 At resonance frequency the impedance of parallel resonance circuit is
A. Maximum
B. Minimum
C. Zero
D. None of the above
8 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
9 Which one of the following is correct?
A. Vo= 1.414 Vrms
B. Iams= 1.414 Io
C. VO = 10.70 Vrms
D. Both a and b
10 For the normal operation of the transistor, its
A. emitter-base and collector base junctions are forward biased
B. emitter-base junction is reversed biased and collector base junction is forward biased
C. emitter-base junction is forward biased and collector-base junction is reverse biased
D. any one of these

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