ECAT Pre Computer Science Chapter 18 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 18 Electronics

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ECAT Physics Chapter 18 Electronics

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Question # 1

If both the inputs given to a gate ae 1 such that the output is 0, then it is:

Question # 2

The SI unit of charge is

Question # 3

Crystal of germanium or silicon in its pure form at absolute zero acts as:

Question # 4

In the forward biases situation, the current flowing across the p-n junction is a few:

Question # 5

When transistors are used in digital circuits they usually operate in the

Question # 6

Depletion region contains:

Question # 7

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

Question # 8

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

Question # 9

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

Question # 10

Op-amp has been discussed as comparator of:

Question # 11

The value of relative permittivity of different dielectrics are

Question # 12

A transistor has:

Question # 13

.Depletion region contains:

Question # 14

Inverter is the name given to:

Question # 15

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

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Sr.# Question Answer
1 The concept of electric field theory was introduced by
A. Michael Faraday
B. Newton
C. Dalton
D. Kepler
2 In full wave rectification, simultaneous action is that:
A. Two diodes conduct and two do not.
B. One diode conduct and three do not.
C. Three diodes conduct and one does not.
D. All the four diodes conduct
3 Depletion region contains:
A. Protons
B. Positive ions
C. Negative ions
D. Both (B) and (C)
4 Most of the electrons in the base of an NPN transistor flow
A. Out of the base lead
B. Into the collector
C. Into the emit
D. Into the base supply
5 If the distance between two charges is doubled, the force between them will become
A. Double
B. Half
C. Three times
D. One fourth
6 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
7 Crystal of germanium or silicon in its pure form at absolute zero acts as:
A. A conductor
B. A semiconductor
C. an insulator
D. Both (A) and (C)
8 Field lines are closer to each other in the region where the filed is
A. Stronger
B. Weaker
C. Much weaker
D. Absent
9 In describing function of digital systems, 1 represents:
A. Closed switch
B. True Statement
C. Lighted bulb
D. Only (B) and (C)
10 Origin of the electric and the gravitational forces
A. Was known in 1911 A.D.
B. Was known in 1811 A.D.
C. Was known in 1711 A.D.
D. is still unknown
11 In a transistor, collector current is controlled by
A. Collector voltage
B. Base current
C. Collector resistance
D. All of the above
12 An electronic computer is basically a vast arrangement of electronic switches which are made from
A. Resistors
B. Transistors
C. N -type crystals
D. P-Type crystals
13 .Depletion region contains:
A. Protons
B. Positive ions
C. Negative ions
D. Both (B) and (C)
14 An LED emits light when it is:
A. Forward biased
B. Reverse biased
C. Operated without battery
D. Operated with heat source
15 The electric field lines start from
A. Positive charge
B. Negative charge
C. Either A or B
D. Neutron

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