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 describing functions of digital systems, a closed switch will be shown as

Question # 2

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

Question # 3

In which of the following diodes when an electron combines with a hole during the forward biasing, photon of visible light is emitted.

Question # 4

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

Question # 5

The closed loop gain of the non-inverting amplifier is given by

Question # 6

Which of the following diodes can operate in the reverse biased condition

Question # 7

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

Question # 8

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

Question # 9

An A.C varies as a function of

Question # 10

When the pn-junction is forward biased. the current flows through it is of the order of

Question # 11

The wave form of alternating voltage is the graph between:

Question # 12

The RMS value of alternating current is:

Question # 13

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

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 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
2 A resonance curve for RLC series circuit is a plot of frequency versus
A. Voltage
B. Current
C. Impedance
D. Reactance
3 To design a resonant circuit of frequency 100 KHz with an inductor of inductance 5 mH, we need a capacitor of capacitance
A. 5.07 pF
B. 50 pF
C. 0.507 pF
D. 507 pF
4 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
5 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
6 The closed loop gain of the inverting amplifier is written as
A. G = R2/R1
B. G = 1 + R2/R1
C. G = -R2/R1
D. G = 1 - R2/R1
7 The magnitude of alternative voltage V:
A. Always increase
B. Always decrease
C. Remains constant
D. Does not remain constant
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 In which of the following components, pn-junction is used
A. light emitting diode
B. photo diode
C. photo voltaic cell
D. all of these
10 Which one of the following Electro-magnetic wave have the highest frequency and shortest wave-length
A. X-rays
B. Ultraviolet rays
C. y-rays
D. Cosmic rays

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