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 power factor of resonant series circuit is

Question # 2

In RLC series circuit, resonance occurs when

Question # 3

Nowadays, Most of the electric energy is produced by the A.C. generators using:

Question # 4

The wave form of alternating voltage is the graph between:

Question # 5

The alternative voltage of current is actually measured by:

Question # 6

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

Question # 7

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

Question # 8

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

Question # 9

Alternating current can be transmitted:

Question # 10

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

Question # 11

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

Question # 12

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

Question # 13

Which of the following has a great concentration of impurity

Question # 14

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

Question # 15

Which of the following diodes can operate in the reverse biased condition

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 Average value of A.C voltage during one cycle is
A. 1
B. Zero
C. Maximum
D. Variable
2 The r.m.s. value of alternating current is equal to its maximum value at angle of
A. 60°
B. 45°
C. 30°
D. 90°
3 Electromagnetic waves transmit energy equal to
A. 1/2 mv2
B. moc2
C. hf/c
D. hf
4 In which of the following components, pn-junction is used
A. light emitting diode
B. photo diode
C. photo voltaic cell
D. all of these
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 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
7 Which of the following diode is used to derive the current in external circuit when light is incident in the circuit
A. photo diode
B. light emitting diode
C. photo voltaic cell
D. none of these
8 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
9 When electrons in the transmitting antenna vibrate 94000 time per second, they produce radiowaves having frequency
A. 9.4 kHz
B. 940 kHz
C. 94 kHz
D. None of these
10 Conversion of alternating current into direct current is called
A. amplification
B. rectification
C. conduction
D. polarization

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