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

Question # 2

In series RC circuit when R=Xc, then the phase angle is

Question # 3

The time interval during which the Voltage source changes its polarity once is known as:

Question # 4

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

Question # 5

The most common source of alternating voltage is:

Question # 6

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

Question # 7

To design a resonant circuit of frequency 100 KHz with an inductor of inductance 5 mH, we need a capacitor of capacitance

Question # 8

Alternating current can induce voltage because it has a

Question # 9

Most OP-AMP operates with

Question # 10

Which one of the following waves belongs to electromagnetic spectrum

Question # 11

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

Question # 12

The closed loop gain of the inverting amplifier is written as

Question # 13

An A.C. voltage is applied across the inductor. When the frequency of the voltage is increased, the current

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 When the pn-junction is forward biased. the current flows through it is of the order of
A. mili-amperes
B. amperes
C. nano-amperes
D. micro-amperes
2 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
3 Alternating current can be transmitted:
A. To long distance
B. At very high cost
C. At very low cost
D. Both (A) and (C)
4 Which one of the following waves belongs to electromagnetic spectrum
A. Radio and TV waves
B. Radar waves
C. Micro waves
D. All of them
5 The alternative voltage of current is actually measured by:
A. Its RMS value
B. Square root of its mean square value
C. Instantaneous value
D. Peak value
6 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
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 In series RC circuit when R=Xc, then the phase angle is
A. 0°
B. 90°
C. 70°
D. 45°
9 Unless stated otherwise, when we speak of A.C. meter reading, we usualy mean:
A. Peak value
B. RMS value
C. Instantaneous value
D. Peak-to-peak value
10 Electromagnetic waves transmit energy equal to
A. 1/2 mv2
B. moc2
C. hf/c
D. hf

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