ECAT Pre Engineering Physics Chapter 12 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 12 Electrostatics

Try The MCQ's Test For Physics ECAT Pre Engineering Chapter 12 Electrostatics

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Physics ECAT Pre Engineering Chapter 12 Electrostatics

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Question # 1

Ohm's law states that

Question # 2

The energy required to charge a capacitor of 5μF by connecting D.C. source of 20 KV is

Question # 3

A hollow insulated conduction sphere is given a positive charge of 10μC. What will be the electric field at the centre of the sphere if its radius is 2 meters?

Question # 4

Which one of the following has larger value of relative permitivity Erat room temperature?

Question # 5

An electric dipole is at the centre of a hollow sphere of radius r. The total normal electric flux through the sphere is (here Q is the charge and d is the distance between the two charges of the dipole)

Question # 6

The resistance of a conductor does not depend on its

Question # 7

The value of electrical constant of proportionality k is

Question # 8

The colour sequence in a carbon resistor in red, brown, orange and silver. The resistance of the resistor is

Question # 9

Which of the following does not obey ohm's law?

Question # 10

106electrons are moving through a wire per second, the current developed is

Question # 11

The fractional change in resistance per kelvin is known as

Question # 12

The concept of field theory was put forward by

Question # 13

If the resistance of 2 ohm and 4 ohm are connected in parallel, the equivalent resistance will be

Question # 14

If two bulbs one of 60 W and other of 100 W are connected in parallel, then which one of the following will flow more?

Question # 15

The electric field due to an infinite long thin wire at a distance R varies as

Question # 16

One coulomb per second is equal to

Question # 17

The relation between charge 'Q' and current 'I' is given by

Question # 18

A medium of dielectric constant 'K' is introduced between the plates of parallel plate condenser. As a result its capcitance

Question # 19

Coulomb's force between two point charges depends upon

Question # 20

Electric flux is defined by the relation

Question # 21

The conductivity of a superconductor is

Question # 22

In a Milikian's oil drop experiment the charge on an oil drop is calculated to be 6.35 x 10-19C. The number of excess electrons on the drop is

Question # 23

The nature of capacity of electrostatic capacitor depends on

Question # 24

Surface density of charge is defined as

Question # 25

The SI unit of electric flux is

Question # 26

One coulomb of charge is created by

Question # 27

The electric potential at the surface of an atomic nucleus (Z = 50) of radius 9.0 x 10-15 is

Question # 28

Which of the following represents an electric current?

Question # 29

The resistance of the given conductor can be increased by

Question # 30

Resistance of a conductor is increased, the currant will

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 Three resistors of resistance R each are combined in various ways. Which of the following cannot be obtained?
A. 3RΩ
B. 2R/4Ω
C. R/3Ω
D. 2R/3Ω
2 The conductivity of a superconductor is
A. Infinite
B. Very large
C. Very small
D. Zero
3 Capacitance of two or more capacitors
A. Increases in series combination
B. Increases in parallel combination
C. Remains unchanged
D. None of the above
4 Solar cell converts sunlight directly into
A. potential energy
B. thermal energy
C. mechanical energy
D. electrical energy
5 Coulomb force, when any material medium is placed between two charges
A. Increases
B. Decreases
C. Remain unchanged
D. None of these
6 The excess (equal in number) of electrons that must be placed on each of two small spheres spaced 3 cm apart, with force of repulsion between the spheres to be 10-19N, is
A. 25
B. 225
C. 625
D. 1250
7 The charge carriers in electrolyte are positive and negative
A. protons
B. electrons
C. ions
D. none of these
8 A point charge Q is placed at the mid-point of a line joining two charges. 4q and q. if the net force on charge q is zero. then Q must be equal to
A. -q
B. +q
C. -2q
D. +4q
9 A heater coil rated at (1000 W - 200 V) is connected to 110 volt line. What will be the power consumed?
A. 200 W
B. 302.5
C. 250 W
D. 350 W
10 When an electron is accelerated through a P.D. of an one volt, it will acquire energy equal to
A. One joule
B. One erg
C. One electron volt
D. None of these

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