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 most common source of alternating voltage is:

Question # 2

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

Question # 3

The bridge circuit of full wave rectification uses

Question # 4

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

Question # 5

In half wave rectification

Question # 6

A resonance curve for RLC series circuit is a plot of frequency versus

Question # 7

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

Question # 8

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

Question # 9

For a n-p-n transistor, the conventional current equation can be written as

Question # 10

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

Question # 11

Which one of the following waves belongs to electromagnetic spectrum

Question # 12

The power factor of resonant series circuit is

Question # 13

Conversion of alternating current into direct current is called

Question # 14

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

Question # 15

Peak value of alternative current is:

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 The magnitude of alternative voltage V:
A. Always increase
B. Always decrease
C. Remains constant
D. Does not remain constant
2 Alternating current can induce voltage because it has a
A. High peak value
B. Varying magnetic field
C. Stronger field than direct curren
D. Constant magnetic field
3 At resonance, the phase angle for RLC series resonance circuit equals
A. 0°
B. 90°
C. 180°
D. 270°
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 Which one of the following Electro-magnetic wave have the highest frequency and shortest wave-length
A. X-rays
B. Ultraviolet rays
C. y-rays
D. Cosmic rays
6 In which of the following diodes when an electron combines with a hole during the forward biasing, photon of visible light is emitted.
A. photo diode
B. light emitting diode
C. photo voltaic cell
D. all of them
7 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
8 The device which allows only the flow of an A.C. through a circuit is
A. Capacitor
B. Inductor
C. D.C. motor
D. Battery
9 The input resistance of the OP-AMP is the resistance between the
A. (-) input and output
B. (+) input and output
C. (-) and (+) inputs
D. between any inputs
10 In an A.C circuit with resistor only, the current and voltage have a phase angle of
A. 90°
B. 0°
C. 180°
D. none of these

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