ECAT Pre General Science Physics Chapter 16 MCQ Test With Answer

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

Try The 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

If we connect a A.C. volt meter to read A.C. voltage, It would read its:

Question # 2

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

Question # 3

The highest value reached by the voltage or current:

Question # 4

An A.C varies as a function of

Question # 5

For normal operation of transistor, the batteries

Question # 6

A diode characteristic curve is a plot between

Question # 7

The device which allows only the flow of an A.C. through a circuit is

Question # 8

Alternating current is produced by a voltage source which polarity:

Question # 9

To design a resonant circuit of frequency 100 KHz with an inductor of inductance 5 mH, we need a capacitor of capacitance

Question # 10

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

Question # 11

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

Question # 12

Alternating current can be transmitted:

Question # 13

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

Question # 14

Peak value of alternative current is:

Question # 15

During each cycle, alternating voltage reaches a peak value

Question # 16

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

Question # 17

Most OP-AMP operates with

Question # 18

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

Question # 19

The input resistance of the OP-AMP is the resistance between the

Question # 20

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

Question # 21

Average value of A.C voltage during one cycle is

Question # 22

In a transistor, the central region is called

Question # 23

The RMS value of alternating current is:

Question # 24

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

Question # 25

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

Question # 26

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

Question # 27

In RLC series circuit, resonance occurs when

Question # 28

When the pn-junction is forward biased. the current flows through it is of the order of

Question # 29

In frequency modulation (FM), the carrier waves amplitude

Question # 30

Nowadays, Most of the electric energy is produced by the A.C. generators using:

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 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
2 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
3 The magnitude of alternative voltage V:
A. Always increase
B. Always decrease
C. Remains constant
D. Does not remain constant
4 The basic circuit element in A.C. circuits are:
A. Resistor and capacitor
B. Resistor and Inductor
C. Capacitor only
D. Both (B) and (C)
5 The value of current gain of n-p-n transistor is of the order of
A. tens
B. hundreds
C. thousands
D. ten thousands
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 Alternating current can induce voltage because it has a
A. High peak value
B. Varying magnetic field
C. Stronger field than direct curren
D. Constant magnetic field
8 In describing functions of digital systems, a closed switch will be shown as
A. 0
B. 1
C. low
D. any one of these
9 The length of rotating vector (on a certain scale) represents the:
A. Peak value of alternating quantity
B. RMS value of alternating quantity
C. Instantaneous value of alternating quantity
D. Either (B) or (C)
10 Due to the high value of the input resistance, practically, the value of the current which flows between the input terminals is
A. zero
B. small
C. large
D. very large

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