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

Question # 2

A sinusoidally alternating voltage or current can be graphically represented by a:

Question # 3

The total reactance of a series RLC circuit at resonance is

Question # 4

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

Question # 5

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

Question # 6

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

Question # 7

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

Question # 8

The open loop gain of OP-AMP is of the order of

Question # 9

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

Question # 10

When the pn-junction is connected reversed biased, its resistance is of the order of

Question # 11

Transmitting antenna emits

Question # 12

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

Question # 13

For the normal operation of the transistor, its

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 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
2 The power factor of resonant series circuit is
A. 1
B. 0
C. -1
D. 0.5
3 If 250V is the RMS value of alternative voltage, then its peak value Vowill be:
A. 353.5V
B. 250V
C. 175V
D. zero
4 Peak value of alternative current is:
A. one of its Instantaneous value
B. Equal to its RMS value
C. The same as its peak-to-peak value
D. Both (B) and (C)
5 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
6 In free space, the speed of electromagnetic waves is
A. 3 x 108ms-1
B. 3 x 106ms-1
C. 4 x 107ms-1
D. 3 x 109ms-1
7 If the value of C in a series RLC circuit is increased, the resonant frequency
A. Is not affected
B. Increase
C. Remains the same
D. Decreases
8 A signal is amplified at the output without any change of phase, if it is applied at the
A. inverting input
B. non-inverting input
C. at any of the input
D. none of these
9 The phase at the positive peak of an A.C. cycle is:
A. 0º

B. 90º

C. 180º

D. 0 andᏘ
10 When the pn-junction is in reversed biased, current flows through the junction due to the
A. majority carriers
B. minority carriers
C. either of them
D. none of them

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