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

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

Question # 2

In which of the following components, pn-junction is used

Question # 3

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

Question # 4

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 # 5

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

Question # 6

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

Question # 7

For normal operation of transistor, the batteries

Question # 8

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

Question # 9

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

Question # 10

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

Question # 11

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

Question # 12

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

Question # 13

Alternating current can induce voltage because it has a

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 The total reactance of a series RLC circuit at resonance is
A. zero
B. Equal to the resistance
C. Infinity
D. Capacitive
2 Mathematical manipulation of the two quantized states can be best carried if they are represented by
A. high - low
B. yes - no
C. on - off
D. 0 - 1
3 The average of A.C. current and voltage over a complete cycle is
A. Maximum
B. zero
C. Neither zero nor maximum
D. None of these
4 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
5 During each cycle, alternating voltage reaches a peak value
A. One time
B. Two times
C. Four times
D. A number of times depending on the frequency
6 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
7 The magnitude of alternative voltage V:
A. Always increase
B. Always decrease
C. Remains constant
D. Does not remain constant
8 The length of rotating vector (on a certain scale) represents the:
A. Peak value of alternating quantity
B. RMS value of alternating quantity
C. Instantaneous value of alternating quantity
D. Either (B) or (C)
9 The open loop gain of OP-AMP is of the order of
A. 102
B. 103
C. 104
D. 105
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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