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

When the pn-junction is forward biased. the current flows through it is of the order of

Question # 2

In frequency modulation (FM), the carrier waves amplitude

Question # 3

The RMS value of alternating current is:

Question # 4

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

Question # 5

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

Question # 6

In a normally biased n-p-n transistor, an electron c current IEflows from the

Question # 7

Which of the following diode is used for the detection of light

Question # 8

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

Question # 9

The most common source of alternating voltage is:

Question # 10

Nowadays, Most of the electric energy is produced by the A.C. generators using:

Question # 11

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

Question # 12

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

Question # 13

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

Question # 14

The value of current gain of n-p-n transistor is of the order of

Question # 15

In describing functions of digital systems, a closed switch will be shown as

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 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
2 The length of rotating vector (on a certain scale) represents the:
A. Peak value of alternating quantity
B. RMS value of alternating quantity
C. Instantaneous value of alternating quantity
D. Either (B) or (C)
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 Average value of A.C voltage during one cycle is
A. 1
B. Zero
C. Maximum
D. Variable
5 Chock consumes externally small
A. Charge
B. Current
C. Power
D. Potential
6 SI unit of impedance is
A. hertz
B. henry
C. ampere
D. ohms
7 If 250V is the RMS value of alternative voltage, then its peak value Vowill be:
A. 353.5V
B. 250V
C. 175V
D. zero
8 For a n-p-n transistor, the conventional current equation can be written as
A. IE+ IC= IB
B. IC- IB= IE
C. IC+ IB= IE
D. IB+ IE= IC
9 When the emitter-base junction of a transistor is reverse biased, collector current
A. Reverses
B. Increases
C. Decreases
D. Stops
10 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

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