ECAT Pre General Science Physics Chapter 16 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 16 Alternating Current

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ECAT Pre General Science Physics Chapter 16 Alternating Current

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Question # 1

The output voltage of half wave rectification is in the form of

Question # 2

For the normal operation of the transistor, its

Question # 3

When a transistor is used as a switch the circuit in which the current is to be switched OFF and ON, is connected between the

Question # 4

SI unit of impedance is

Question # 5

At resonance, the impedance of RLC series circuit is

Question # 6

The value of output resistance of OP-AMOP is of the order of

Question # 7

Which one of the following is correct?

Question # 8

For normal operation of transistor, the batteries

Question # 9

OP-AMP has the following input terminals

Question # 10

Peak value of alternative current is:

Question # 11

A diode characteristic curve is a plot between

Question # 12

The bridge circuit of full wave rectification uses

Question # 13

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

Question # 14

During each cycle, alternating voltage reaches a peak value

Question # 15

If the value of C in a series RLC circuit is increased, the resonant frequency

Question # 16

Alternating current can induce voltage because it has a

Question # 17

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

Question # 18

The wave form of alternating voltage is the graph between:

Question # 19

In which of the following components, pn-junction is used

Question # 20

The total reactance of a series RLC circuit at resonance is

Question # 21

In which of the following diodes when an electron combines with a hole during the forward biasing, photon of visible light is emitted.

Question # 22

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

Question # 23

The closed loop gain of the inverting amplifier is written as

Question # 24

In RLC series circuit, resonance occurs when

Question # 25

The length of rotating vector (on a certain scale) represents the:

Question # 26

When the p-n junction is forward biased its resistance is of the order of

Question # 27

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

Question # 28

In describing functions of digital systems, a closed switch will be shown as

Question # 29

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

Question # 30

In frequency modulation (FM), the carrier waves amplitude

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 An A.C. voltmeter read 250 volts. The frequency of alternating is 50 Hz, the peak value of voltage is
A. 3525.0 volts
B. 35.35 volts
C. 353.5 volts
D. 3.535 volts
2 Which of the following has a great concentration of impurity
A. base
B. emitter
C. collector
D. none of these
3 Transmitting antenna emits
A. Magnetic waves
B. Electric waves
C. Electromagnetic waves
D. Sound waves
4 The phase at the positive peak of an A.C. cycle is:
A. 0º

B. 90º

C. 180º

D. 0 andᏘ
5 The R1= infinity and R2= 0, then the gain of non-inverting amplifier is
A. zero
B. infinity
C. one
D. any one of these
6 Alternating current is produced by a voltage source which polarity:
A. Remains the same
B. Reverse after period T
C. Keeps on reversing with time
D. Reverse after every time interval T/2
7 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
8 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
9 An A.C varies as a function of
A. Current
B. Voltage
C. Time
D. Charge
10 When electrons in the transmitting antenna vibrate 94000 time per second, they produce radiowaves having frequency
A. 9.4 kHz
B. 940 kHz
C. 94 kHz
D. None of these

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