ECAT Pre General Science Physics Chapter 18 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 18 Electronics

Try The MCQ's Test For ECAT Pre General Science Physics Chapter 18 Electronics

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ECAT Pre General Science Physics Chapter 18 Electronics

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Question # 1

Electric lines of force

Question # 2

The number of LED'S needed to display all the digits is:

Question # 3

Electric field strength is defined as

Question # 4

Computer chips are made from:

Question # 5

In an N-type silicon, which of the following statement is true

Question # 6

To designate the voltage as low or 0 by a logic gate, the specified minimum value is:

Question # 7

Electric intensity at a place due to a charged conductor is a

Question # 8

Op-amp has been discussed as comparator of:

Question # 9

To turn the transistor OFF, the base current is set:

Question # 10

Silicon is one of the mot commonly used:

Question # 11

The electric field lines start from

Question # 12

Majority charge carriers in the p-region of p-n junction are:

Question # 13

By placing a dielectric in between the charges, the electrostatic force between them

Question # 14

Whenever a covalent bond breaks, it creates:

Question # 15

The values 1 and 0 are designated as:

Question # 16

In reverse-biased p-n junction, the reverse current is due to flow of:

Question # 17

A potential barrier of 0.7V exists across p-n junction made from:

Question # 18

Field lines are closer to each other in the region where the filed is

Question # 19

In describing function of digital systems, 1 represents:

Question # 20

A digital system deals with quantities which has discrete values:

Question # 21

A potential barrier of 0.7 V exists across p-n junction made from:

Question # 22

Inverter is the name given to:

Question # 23

If the distance between two charges is doubled, the force between them will become

Question # 24

All the valence electrons present in a crystal of silicon are bound in their orbits by

Question # 25

In the text book, the transistor amplifier circuit is a:

Question # 26

The SI unit of charge is

Question # 27

Most of the electrons in the base of an NPN transistor flow

Question # 28

Conversion of A.C. into D.C. is called:

Question # 29

Electric field lines emerge from the charges in

Question # 30

.Depletion region contains:

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ECAT Physics Chapter 18 Important MCQ's

Sr.# Question Answer
1 An LED emits light when it is:
A. Forward biased
B. Reverse biased
C. Operated without battery
D. Operated with heat source
2 A diode which can turn its current ON and OFF in nono seconds is called:
A. LED
B. Photodiode
C. An ordinary diode.
D. Both (A) and (B)
3 To make an LED, it is impreacticable to use:
A. Silicon
B. Gallium arsenide
C. Gallium arsenide phosphide
D. Iron
4 If the distance between two charges is doubled, the force between them will become
A. Double
B. Half
C. Three times
D. One fourth
5 The value of relative permittivity of different dielectrics are
A. Equal
B. Different
C. Greater than one
D. Smaller than one
6 Electric field lines emerge from the charges in
A. One dimension
B. Two dimensions
C. Three dimensions
D. Four dimensions
7 When transistors are used in digital circuits they usually operate in the
A. Active region
B. Breakdown region
C. Saturation and cutoff regions
D. Linear region
8 A transistor has:
A. One region
B. Two regions
C. Three regions
D. Four regions
9 Electric field strength is defined as
A. Work done on unit charge
B. Force exerted on unit charge
C. Distance covered by unit charge
D. Power exerted by unit charge
10 Depletion region contains:
A. Protons
B. Positive ions
C. Negative ions
D. Both (B) and (C)

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