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

During each cycle, alternating voltage reaches a peak value

Question # 2

Alternating current can induce voltage because it has a

Question # 3

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

Question # 4

When the p-n junction is forward biased its resistance is of the order of

Question # 5

The highest value reached by the voltage or current:

Question # 6

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

Question # 7

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

Question # 8

The wave form of alternating voltage is the graph between:

Question # 9

Electromagnetic waves transmit energy equal to

Question # 10

In half wave rectification

Question # 11

The output voltage of half wave rectification is in the form of

Question # 12

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

Question # 13

SI unit of impedance is

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 The amplifier which us used to perform mathematical operations electronically is known as
A. calculator
B. OP-AMP
C. computer
D. any one of them
2 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
3 The power factor of resonant series circuit is
A. 1
B. 0
C. -1
D. 0.5
4 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
5 The emitter-base junction of a transistor is forward-biased and collector-base junction is reverse-biased. If the base current is increased, its
A. Icwill decrease
B. VCEwill increase
C. ICwill increase
D. VCCwill increase
6 For the normal operation of the transistor, its
A. emitter-base and collector base junctions are forward biased
B. emitter-base junction is reversed biased and collector base junction is forward biased
C. emitter-base junction is forward biased and collector-base junction is reverse biased
D. any one of these
7 SI unit of impedance is
A. hertz
B. henry
C. ampere
D. ohms
8 For normal operation of transistor, the batteries
A. VCCis of much lower value than VBB
B. VCCis of much higher value than VBB
C. VCC is equal toVBB
D. none of these
9 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
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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