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

Alternating current can be transmitted:

Question # 2

Which one of the following waves belongs to electromagnetic spectrum

Question # 3

The entire wave form of sinusoidal voltage is actually a set of all the:

Question # 4

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

Question # 5

A changing magnetic flux creates around itself

Question # 6

Which of the following diode is used for the detection of light

Question # 7

When the emitter-base junction of a transistor is reverse biased, collector current

Question # 8

If 250V is the RMS value of alternative voltage, then its peak value Vowill be:

Question # 9

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

Question # 10

The emitter-base junction of a transistor is forward-biased and collector-base junction is reverse-biased. If the base current is increased, its

Question # 11

The value of current gain of n-p-n transistor is of the order of

Question # 12

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

Question # 13

Mathematical manipulation of the two quantized states can be best carried if they are represented by

Question # 14

In RLC series circuit, resonance occurs when

Question # 15

Conversion of alternating current into direct current is called

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 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
2 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
3 When the pn-junction is forward biased. the current flows through it is of the order of
A. mili-amperes
B. amperes
C. nano-amperes
D. micro-amperes
4 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
5 In a normally biased n-p-n transistor, an electron c current IEflows from the
A. emitter into the base
B. collector into the base
C. base into collector
D. none of these
6 An A.C. voltage is applied across the inductor. When the frequency of the voltage is increased, the current
A. Decreases
B. Increases
C. Does not change
D. Momentarily goes to zero
7 The r.m.s. value of alternating current is equal to its maximum value at angle of
A. 60°
B. 45°
C. 30°
D. 90°
8 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
9 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
10 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

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