ECAT Pre Computer Science Chapter 16 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 16 Alternating Current

Try The MCQ's Test For ECAT Physics Chapter 16 Alternating Current

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ECAT Physics Chapter 16 Alternating Current

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Question # 1

Which one of the following waves belongs to electromagnetic spectrum

Question # 2

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

Question # 3

At resonance, the impedance of RLC series circuit is

Question # 4

Alternating current is produced by a voltage source which polarity:

Question # 5

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

Question # 6

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

Question # 7

The most common source of alternating voltage is:

Question # 8

At resonance, the phase angle for RLC series resonance circuit equals

Question # 9

When either L or C is increased, the resonant frequency of the RLC series circuit

Question # 10

Alternating current can induce voltage because it has a

Question # 11

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 # 12

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

Question # 13

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

Question # 14

The basic circuit element in D.C. circuit is:

Question # 15

During the positive half-cycle in the half-wave rectification,the diode

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 Transmitting antenna emits
A. Magnetic waves
B. Electric waves
C. Electromagnetic waves
D. Sound waves
2 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
3 A p-n junction is formed when a crystal of silicon is growth in such a way that its one half is doped with trivalent impurity and the other half with a impurity from
A. 2nd group
B. fourth group
C. fifth group
D. sixth group
4 Which one of the following waves belongs to electromagnetic spectrum
A. Radio and TV waves
B. Radar waves
C. Micro waves
D. All of them
5 For normal operation of transistor, the batteries
A. VCCis of much lower value than VBB
B. VCCis of much higher value than VBB
C. VCC is equal toVBB
D. none of these
6 Mathematical manipulation of the two quantized states can be best carried if they are represented by
A. high - low
B. yes - no
C. on - off
D. 0 - 1
7 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
8 In a transistor, if the central region is p-type then this type of transistor is known as
A. p-n-p transistor
B. n-p-n transistor
C. either of these
D. none of these
9 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
10 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

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