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

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 # 2

At resonance, the phase angle for RLC series resonance circuit equals

Question # 3

The value of the potential difference across the depletion region for the case of germanium is

Question # 4

The emitter-base junction of a transistor is forward-biased and collector-base junction is reverse-biased. If the base current is increased, its

Question # 5

A P-N juction or semiconductor diode cannot be used as

Question # 6

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

Question # 7

Which one of the following is correct?

Question # 8

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

Question # 9

Chock consumes externally small

Question # 10

In a transistor, if the central region is p-type then this type of transistor is known as

Question # 11

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

Question # 12

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

Question # 13

A changing magnetic flux creates around itself

Question # 14

For normal operation of transistor, the batteries

Question # 15

Average value of A.C voltage during one cycle is

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 Which one of the following is correct?
A. Vo= 1.414 Vrms
B. Iams= 1.414 Io
C. VO = 10.70 Vrms
D. Both a and b
2 The device which allows only the flow of an A.C. through a circuit is
A. Capacitor
B. Inductor
C. D.C. motor
D. Battery
3 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
4 In frequency modulation (FM), the carrier waves amplitude
A. Remains constant
B. Increase
C. Decreases
D. None of these
5 Alternating current is produced by a voltage source which polarity:
A. Remains the same
B. Reverse after period T
C. Keeps on reversing with time
D. Reverse after every time interval T/2
6 The phase angle of a series RLC circuit at resonance is
A. 180°
B. 90°
C. 0°
D. None of the these
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 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
9 Peak value of alternative current is:
A. one of its Instantaneous value
B. Equal to its RMS value
C. The same as its peak-to-peak value
D. Both (B) and (C)
10 Most OP-AMP operates with
A. + 6 V supply
B. + 10 V supply
C. + 12 V supply
D. + 24 V supply

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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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