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

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

Question # 2

The value of output resistance of OP-AMOP is of the order of

Question # 3

Conversion of alternating current into direct current is called

Question # 4

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

Question # 5

At higher frequency of the alternating current, the capacitive reactance Xc

Question # 6

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

Question # 7

In an A.C circuit with resistor only, the current and voltage have a phase angle of

Question # 8

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

Question # 9

The basic circuit element in D.C. circuit is:

Question # 10

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

Question # 11

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

Question # 12

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

Question # 13

In which of the following diodes when an electron combines with a hole during the forward biasing, photon of visible light is emitted.

Question # 14

The length of rotating vector (on a certain scale) represents the:

Question # 15

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 When the p-n junction is forward biased its resistance is of the order of
A. few mega ohms
B. few kilo ohms
C. few ohms
D. few milli ohms
2 The magnitude of alternative voltage V:
A. Always increase
B. Always decrease
C. Remains constant
D. Does not remain constant
3 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°
4 The open loop gain of OP-AMP is of the order of
A. 102
B. 103
C. 104
D. 105
5 In series RC circuit when R=Xc, then the phase angle is
A. 0°
B. 90°
C. 70°
D. 45°
6 When the emitter-base junction of a transistor is reverse biased, collector current
A. Reverses
B. Increases
C. Decreases
D. Stops
7 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
8 At resonance frequency the impedance of parallel resonance circuit is
A. Maximum
B. Minimum
C. Zero
D. None of the above
9 In half wave rectification
A. both halves of the input voltage is used
B. only one half of the input voltage is used
C. either of these
D. none of these
10 At resonance, the impedance of RLC series circuit is
A. Maximum
B. Zero
C. Minimum
D. Determinate

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