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

Which one of the following Electro-magnetic wave have the highest frequency and shortest wave-length

Question # 2

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

Question # 3

The device which allows only the flow of an A.C. through a circuit is

Question # 4

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

Question # 5

The Instantaneous value of alternative current maybe:

Question # 6

Most OP-AMP operates with

Question # 7

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

Question # 8

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

Question # 9

The bridge circuit of full wave rectification uses

Question # 10

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

Question # 11

An A.C. voltmeter read 250 volts. The frequency of alternating is 50 Hz, the peak value of voltage is

Question # 12

In frequency modulation (FM), the carrier waves amplitude

Question # 13

The total reactance of a series RLC circuit at resonance is

Question # 14

A changing magnetic flux creates around itself

Question # 15

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 The waveform of alternating voltage is a:
A. Square
B. Rectangular
C. Saw-tooth
D. Sinusoidal
2 The circuit which is used to smooth the output voltage of the full-wave rectification is known as
A. transformer
B. rectifier
C. filter
D. none of these
3 A digital system deals with quantities or variables which have
A. only one state
B. only two discrete states
C. three discrete states
D. four discrete states
4 A sinusoidally alternating voltage or current can be graphically represented by a:
A. Vector
B. Rotating vector
C. Clockwise vector
D. Anticlockwise voltage vector
5 Which of the following has a great concentration of impurity
A. base
B. emitter
C. collector
D. none of these
6 Due to the high value of the input resistance, practically, the value of the current which flows between the input terminals is
A. zero
B. small
C. large
D. very large
7 The sum of positive and negative peak values is called:
A. Instantaneous value
B. Peak value
C. Rms valuie
D. Peak-to peak-value
8 An A.C. voltmeter read 250 volts. The frequency of alternating is 50 Hz, the peak value of voltage is
A. 3525.0 volts
B. 35.35 volts
C. 353.5 volts
D. 3.535 volts
9 During the negative half-cycle of the half-wave rectification, the diode
A. does not conduct
B. conducts
C. either of these
D. none of these
10 The wave form of alternating voltage is the graph between:
A. Voltage across X-axis and time across y-axis
B. Current and time
C. Voltage along y-axis and time along x-axis
D. Voltage and current

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