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

Which one of the following Electro-magnetic wave have the highest frequency and shortest wave-length

Question # 2

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

Question # 3

Average value of A.C voltage during one cycle is

Question # 4

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

Question # 5

If the value of C in a series RLC circuit is increased, the resonant frequency

Question # 6

The Instantaneous value of alternative current maybe:

Question # 7

A signal appears after amplification, at the output terminal with a phase shift of 180° , if it is applied at

Question # 8

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

Question # 9

At higher frequency of the alternating current, the capacitive reactance Xc

Question # 10

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

Question # 11

In n-p-n transistor, emitter base junction is kept

Question # 12

The basic circuit element in A.C. circuits are:

Question # 13

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

Question # 14

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

Question # 15

When either L or C is increased, the resonant frequency of the RLC series circuit

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 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
2 The r.m.s. value of alternating current is equal to its maximum value at angle of
A. 60°
B. 45°
C. 30°
D. 90°
3 Which of the following diode is used to derive the current in external circuit when light is incident in the circuit
A. photo diode
B. light emitting diode
C. photo voltaic cell
D. none of these
4 If 250V is the RMS value of alternative voltage, then its peak value Vowill be:
A. 353.5V
B. 250V
C. 175V
D. zero
5 The value of the input resistance of OP-AMP is of the order of
A. few ohms
B. few hundred ohms
C. several kilo ohms
D. several maga ohms
6 Chock consumes externally small
A. Charge
B. Current
C. Power
D. Potential
7 The Instantaneous value of alternative current maybe:
A. The same as its RMS value
B. Greater than its Rms value
C. The same as its peak value
D. Any of these
8 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
9 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
10 A diode characteristic curve is a plot between
A. current and time
B. voltage and time
C. voltage and current
D. forward voltage and reversed voltage

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