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

The RMS value of alternating current is:

Question # 3

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

Question # 4

Which of the following has a great concentration of impurity

Question # 5

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

Question # 6

Alternating current is produced by a voltage source which polarity:

Question # 7

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

Question # 8

The wave form of alternating voltage is the graph between:

Question # 9

In an A.C circuit with resistor only, the current and voltage have a phase angle of

Question # 10

Peak value of alternative current is:

Question # 11

The phase angle of a series RLC circuit at resonance is

Question # 12

The open loop gain of OP-AMP is of the order of

Question # 13

A P-N juction or semiconductor diode cannot be used as

Question # 14

Alternating current can induce voltage because it has a

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 The magnitude of alternative voltage V:
A. Always increase
B. Always decrease
C. Remains constant
D. Does not remain constant
2 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)
3 The value of the potential difference across the depletion region for the case of germanium is
A. 0.3 V
B. 0.5 V
C. 0.7 V
D. 0.9 V
4 Unless stated otherwise, when we speak of A.C. meter reading, we usualy mean:
A. Peak value
B. RMS value
C. Instantaneous value
D. Peak-to-peak value
5 At resonance, the impedance of RLC series circuit is
A. Maximum
B. Zero
C. Minimum
D. Determinate
6 In a transistor, if the central region is n-type, then this type of transistor is known as
A. n-p-n transistor
B. p-n-p transistor
C. either of these
D. none of these
7 The output voltage of half wave rectification is in the form of
A. a smooth curve
B. a smooth wave
C. pulses
D. all of the above
8 The alternative voltage of current is actually measured by:
A. Its RMS value
B. Square root of its mean square value
C. Instantaneous value
D. Peak value
9 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
10 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

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