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

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

Question # 2

Which one of the following is correct?

Question # 3

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

Question # 4

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

Question # 5

Which of the following has a great concentration of impurity

Question # 6

If we connect a A.C. volt meter to read A.C. voltage, It would read its:

Question # 7

A diode characteristic curve is a plot between

Question # 8

A sinusoidally alternating voltage or current can be graphically represented by a:

Question # 9

Peak value of alternative current is:

Question # 10

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

Question # 11

In RLC series circuit, resonance occurs when

Question # 12

If we connected the ordinary DC ammeter to measure alternating current, it would measure its:

Question # 13

The RMS value of alternating current is:

Question # 14

At resonance, the impedance of RLC series circuit is

Question # 15

In free space, the speed of electromagnetic waves is

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 In an A.C circuit with resistor only, the current and voltage have a phase angle of
A. 90°
B. 0°
C. 180°
D. none of these
2 When the emitter-base junction of a transistor is reverse biased, collector current
A. Reverses
B. Increases
C. Decreases
D. Stops
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 During the negative half-cycle of the half-wave rectification, the diode
A. does not conduct
B. conducts
C. either of these
D. none of these
5 Which of the following diode is used for the detection of light
A. photo diode
B. light emitting diode
C. photo voltaic cell
D. all of them
6 In a transistor, if the central region is p-type then this type of transistor is known as
A. p-n-p transistor
B. n-p-n transistor
C. either of these
D. none of these
7 The value of output resistance of OP-AMOP is of the order of
A. few ohms
B. few hundred ohms
C. several kilo ohms
D. several mega ohms
8 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
9 If we connected the ordinary DC ammeter to measure alternating current, it would measure its:
A. Instantaneous value
B. RMS value
C. Value averaged over a cycle
D. Either (B) or (C)
10 When the pn-junction is in reversed biased, current flows through the junction due to the
A. majority carriers
B. minority carriers
C. either of them
D. none of them

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