ECAT Pre Engineering Physics Chapter 16 MCQ Test With Answer

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

Try The MCQ's Test For Physics ECAT Pre Engineering Chapter 16 Alternating Current

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Physics ECAT Pre Engineering Chapter 16 Alternating Current

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Question # 1

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 # 2

A changing magnetic flux creates around itself

Question # 3

The impedance of RLC series resonance circuit at resonant frequency is

Question # 4

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

Question # 5

Transmitting antenna emits

Question # 6

Chock consumes externally small

Question # 7

The wave form of alternating voltage is the graph between:

Question # 8

Peak value of alternative current is:

Question # 9

When the emitter-base junction of a transistor is reverse biased, collector current

Question # 10

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

Question # 11

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

Question # 12

The device which allows only the flow of an A.C. through a circuit is

Question # 13

Which one of the following Electro-magnetic wave have the highest frequency and shortest wave-length

Question # 14

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

Question # 15

Most OP-AMP operates with

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 In n-p-n transistor, emitter base junction is kept
A. reversed
B. forward biased
C. may be reversed or may be forward biased
D. none of these
2 The emitter-base junction of a transistor is forward-biased and collector-base junction is reverse-biased. If the base current is increased, its
A. Icwill decrease
B. VCEwill increase
C. ICwill increase
D. VCCwill increase
3 An A.C. voltmeter read 250 volts. The frequency of alternating is 50 Hz, the peak value of voltage is
A. 3525.0 volts
B. 35.35 volts
C. 353.5 volts
D. 3.535 volts
4 The value of the input resistance of OP-AMP is of the order of
A. few ohms
B. few hundred ohms
C. several kilo ohms
D. several maga ohms
5 The most common source of alternating voltage is:
A. Motor
B. Transformer
C. AC genrator
D. Both (A) and (C)
6 SI unit of impedance is
A. hertz
B. henry
C. ampere
D. ohms
7 A signal appears after amplification, at the output terminal with a phase shift of 180° , if it is applied at
A. inverting input
B. non-inverting input
C. any one of the input terminal
D. none of them
8 An A.C. voltage is applied across the inductor. When the frequency of the voltage is increased, the current
A. Decreases
B. Increases
C. Does not change
D. Momentarily goes to zero
9 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
10 The alternative voltage of current is actually measured by:
A. Its RMS value
B. Square root of its mean square value
C. Instantaneous value
D. Peak value

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