ECAT Pre Computer Science Chapter 16 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 16 Alternating Current

Try The MCQ's Test For ECAT Physics Chapter 16 Alternating Current

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ECAT Physics Chapter 16 Alternating Current

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Question # 1

The R1= infinity and R2= 0, then the gain of non-inverting amplifier is

Question # 2

The alternative voltage of current is actually measured by:

Question # 3

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

Question # 4

A changing magnetic flux creates around itself

Question # 5

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

Question # 6

Which one of the following waves belongs to electromagnetic spectrum

Question # 7

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

Question # 8

The impedance of RLC series resonance circuit at resonant frequency is

Question # 9

Alternating current can be transmitted:

Question # 10

During each cycle, alternating voltage reaches a peak value

Question # 11

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

Question # 12

In which of the following components, pn-junction is used

Question # 13

In a transistor, the central region is called

Question # 14

Alternating current can induce voltage because it has a

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 In a normally biased n-p-n transistor, an electron c current IEflows from the
A. emitter into the base
B. collector into the base
C. base into collector
D. none of these
2 Alternating current can be transmitted:
A. To long distance
B. At very high cost
C. At very low cost
D. Both (A) and (C)
3 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
4 At resonance, the phase angle for RLC series resonance circuit equals
A. 0°
B. 90°
C. 180°
D. 270°
5 An A.C varies as a function of
A. Current
B. Voltage
C. Time
D. Charge
6 Which of the following has a great concentration of impurity
A. base
B. emitter
C. collector
D. none of these
7 When the p-n junction is forward biased its resistance is of the order of
A. few mega ohms
B. few kilo ohms
C. few ohms
D. few milli ohms
8 A signal is amplified at the output without any change of phase, if it is applied at the
A. inverting input
B. non-inverting input
C. at any of the input
D. none of these
9 At higher frequency of the alternating current, the capacitive reactance Xc
A. Increases
B. Decreases
C. Remains the same
D. Increases only when the voltage increases
10 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

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  • Iiqra Fatima

    Iiqra Fatima

    25 May 2018

    You should let us practice difficult mcqs ..These are too easy for ECAT level....Thanku

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