ECAT Pre Engineering Physics Chapter 18 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 18 Electronics Physics

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Physics ECAT Pre Engineering Chapter 18 Electronics Physics

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Question # 1

A digital system deals with quantities which has discrete values:

Question # 2

Electric field strength is defined as

Question # 3

Depletion region contains:

Question # 4

The values 1 and 0 are designated as:

Question # 5

The value of LDR depends upon intensity of:

Question # 6

In full wave rectification, simultaneous action is that:

Question # 7

Inverter is the name given to:

Question # 8

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

Question # 9

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

Question # 10

The use of chips in electrons is described in the form of:

Question # 11

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

Question # 12

Whenever a covalent bond breaks, it creates:

Question # 13

The reverse saturation current in a PN junction diode is only due to

Question # 14

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

Question # 15

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

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Sr.# Question Answer
1 The value of relative permittivity of different dielectrics are
A. Equal
B. Different
C. Greater than one
D. Smaller than one
2 Inverter is the name given to:
A. NOT gate
B. OR gate
C. NOR gate
D. AND gate
3 Improper biasing of a transistor circuit produces
A. Heavy loading of emitter current
B. Distortion in the output signal
C. Excessive heat at collector terminal
D. Faulty location of load line
4 In AND gate, the output is 1 if:
A. Both inputs are 0
B. Both inputs are 1
C. Only one input is 0
D. Both (A) and (B)
5 A hole in p-type my be due to:
A. Trivalent impurity
B. Breking of some covalent bond
C. Pentavalent impurity
D. Germanium
6 By placing a dielectric in between the charges, the electrostatic force between them
A. Is always reduced
B. Is always increased
C. Is not affected
D. Is increased one million times
7 The number of LED'S needed to display all the digits is:
A. Four
B. Five
C. Nine
D. Six
8 In an N-type silicon, which of the following statement is true
A. Electrons are majority carriers and trivalent atoms are the dopants
B. Electrons are minority carriers and pentavalent atoms are the dopants
C. Holes are minority carriers and pentavalent atoms are the dopants
D. Holes are majority carriers and trivalent atoms are the dopants
9 Electric field lines emerge from the charges in
A. One dimension
B. Two dimensions
C. Three dimensions
D. Four dimensions
10 The SI unit of charge is
A. Ampere
B. Watt
C. Coulomb
D. Volt
11 In reverse-biased p-n junction, the reverse current is due to flow of:
A. Minority charge carriers
B. Majority charge carriers
C. Free electrons from p to n-region
D. Holes from n to p-region
12 Field lines are closer to each other in the region where the filed is
A. Stronger
B. Weaker
C. Much weaker
D. Absent
13 All the valence electrons present in a crystal of silicon are bound in their orbits by
A. Ionic bond
B. covalent bond
C. Molecular bond
D. Both (A) and (B)
14 An LED emits light when it is:
A. Forward biased
B. Reverse biased
C. Operated without battery
D. Operated with heat source
15 In describing function of digital systems, 1 represents:
A. Closed switch
B. True Statement
C. Lighted bulb
D. Only (B) and (C)

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