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

The Instantaneous value of alternative current maybe:

Question # 3

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

Question # 4

During each cycle, alternating voltage reaches a peak value

Question # 5

If 250V is the RMS value of alternative voltage, then its peak value Vowill be:

Question # 6

An A.C varies as a function of

Question # 7

Alternating current is produced by a voltage source which polarity:

Question # 8

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

Question # 9

When the emitter-base junction of a transistor is reverse biased, collector current

Question # 10

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

Question # 11

The basic circuit elements of A.C circuit are

Question # 12

During the negative half-cycle of the half-wave rectification, the diode

Question # 13

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

Question # 14

Chock consumes externally small

Question # 15

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 Chock consumes externally small
A. Charge
B. Current
C. Power
D. Potential
2 The value of output resistance of OP-AMOP is of the order of
A. few ohms
B. few hundred ohms
C. several kilo ohms
D. several mega ohms
3 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
4 In RLC series circuit, resonance occurs when
A. XL > Xc
B. XL < Xc
C. XL = Xc
D. None of these
5 Electromagnetic waves transmit energy equal to
A. 1/2 mv2
B. moc2
C. hf/c
D. hf
6 When a transistor is used as a switch the circuit in which the current is to be switched OFF and ON, is connected between the
A. base and emitter
B. collector and emitter
C. base and collector
D. any one of these
7 Transmitting antenna emits
A. Magnetic waves
B. Electric waves
C. Electromagnetic waves
D. Sound waves
8 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
9 At resonance, the impedance of RLC series circuit is
A. Maximum
B. Zero
C. Minimum
D. Determinate
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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