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

The highest value reached by the voltage or current:

Question # 2

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

Question # 3

The phase at the positive peak of an A.C. cycle is:

Question # 4

The RMS value of alternating current is:

Question # 5

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

Question # 6

The bridge circuit of full wave rectification uses

Question # 7

Conversion of alternating current into direct current is called

Question # 8

At resonance frequency the impedance of parallel resonance circuit is

Question # 9

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

Question # 10

Unless stated otherwise, when we speak of A.C. meter reading, we usualy mean:

Question # 11

For the normal operation of the transistor, its

Question # 12

Due to the high value of the input resistance, practically, the value of the current which flows between the input terminals is

Question # 13

When electrons in the transmitting antenna vibrate 94000 time per second, they produce radiowaves having frequency

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 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
2 A changing magnetic flux creates around itself
A. An electromotive force
B. An electric field (changing electric flux)
C. Magnetic field
D. None of the above
3 In series RC circuit when R=Xc, then the phase angle is
A. 0°
B. 90°
C. 70°
D. 45°
4 When the pn-junction is connected reversed biased, its resistance is of the order of
A. few ohms
B. few kilo-ohms
C. few mega-ohms
D. few mili-ohms
5 A signal appears after amplification, at the output terminal with a phase shift of 180° , if it is applied at
A. inverting input
B. non-inverting input
C. any one of the input terminal
D. none of them
6 Nowadays, Most of the electric energy is produced by the A.C. generators using:
A. Hydal water
B. Geothermal energy
C. Solar energy
D. Biomass
7 An A.C varies as a function of
A. Current
B. Voltage
C. Time
D. Charge
8 The entire wave form of sinusoidal voltage is actually a set of all the:
A. Positive maximum value + Voand negative maximum value -Vo
B. Posiotive maximum value +Vo and zero
C. Zero and negative maximum value -Vo
D. Any of these
9 At resonance, the phase angle for RLC series resonance circuit equals
A. 0°
B. 90°
C. 180°
D. 270°
10 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

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