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 a transistor, the central region is called

Question # 2

The average of A.C. current and voltage over a complete cycle is

Question # 3

The magnitude of alternative voltage V:

Question # 4

Which one of the following waves belongs to electromagnetic spectrum

Question # 5

A changing magnetic flux creates around itself

Question # 6

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

Question # 7

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

Question # 8

For a n-p-n transistor, the conventional current equation can be written as

Question # 9

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

Question # 10

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

Question # 11

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

Question # 12

When the pn-junction is connected reversed biased, its resistance is of the order of

Question # 13

At resonance frequency the impedance of parallel resonance circuit is

Question # 14

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

Question # 15

At resonance, the impedance of RLC series circuit is

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 In series RC circuit when R=Xc, then the phase angle is
A. 0°
B. 90°
C. 70°
D. 45°
2 Alternating current can be transmitted:
A. To long distance
B. At very high cost
C. At very low cost
D. Both (A) and (C)
3 The highest value reached by the voltage or current:
A. In quarter cycle is called Instantaneous value
B. In half cycle is called peak-to-peak value
C. In one cycle is called peak value
D. In half cycle is called Instantaneous value
4 The impedance of RLC series resonance circuit at resonant frequency is
A. Greater than R
B. Equal to R
C. Less than R
D. None of these
5 The magnitude of alternative voltage V:
A. Always increase
B. Always decrease
C. Remains constant
D. Does not remain constant
6 The phase at the positive peak of an A.C. cycle is:
A. 0º

B. 90º

C. 180º

D. 0 andᏘ
7 In free space, the speed of electromagnetic waves is
A. 3 x 108ms-1
B. 3 x 106ms-1
C. 4 x 107ms-1
D. 3 x 109ms-1
8 If 250V is the RMS value of alternative voltage, then its peak value Vowill be:
A. 353.5V
B. 250V
C. 175V
D. zero
9 When either L or C is increased, the resonant frequency of the RLC series circuit
A. Increases
B. Decreases
C. Remains the same
D. Becomes zero
10 In half wave rectification
A. both halves of the input voltage is used
B. only one half of the input voltage is used
C. either of these
D. none of these

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