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

Cause of heat production in a current carrying conductor is

Question # 2

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

Question # 3

Electron volt is the unit of

Question # 4

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 # 5

The resistance of an incandescent lamp is

Question # 6

In RC series circuit the time during which the capacitor acquires 0.63 times the equilibrium charge is called

Question # 7

A conducting wire is drawn to double its length. Final resistivity of the material will be

Question # 8

A wire is bent into a ring of radius R is given a charge q. The magnitude of the electrical field at the centre of the ring is

Question # 9

The relation V = IR represents

Question # 10

If an electron of charge 'e' is accelerated through a potential difference V., it will acquire energy

Question # 11

The unit of resistivity is

Question # 12

Consider a spherical shell of metal at he centre of which a positive point charge is kept

Question # 13

Which one of the following causes production of heat when current is set up in a wire?

Question # 14

In bringing an electron towards another electron, electrostatic potential energy of system

Question # 15

Some charge is being given to a conductor. Then its potential

Question # 16

Which of the following represents an electric current?

Question # 17

A closed surface contains two equal and opposite charges. The net electric flux from the surface will be

Question # 18

If 2.2 kilowatt power is transmitted through 1 10 ohm line at 22000 volt, the power loss in the form of heat will be

Question # 19

Two point charge +3μC and +8μC repel each other with a force of 40 N. If a charge of -5μC is added to each of them, then the force between then will become

Question # 20

If electric and gravitational force on an electron in a uniform electric field will be

Question # 21

The electric flux is linked with a surface will be maximum when

Question # 22

When a dielectric material is introduced between the plates of a charged condenser the electric field between the plates

Question # 23

Electric flux is defined by the relation

Question # 24

One electron volt is equal to

Question # 25

Magnetic effect at a point caused due to flow a current depend upon the

Question # 26

At ordinary temperature, an increase in temperature increases the conductivity of

Question # 27

Heating effect caused by an electric circuit is written

Question # 28

If we increase the distance between two plates of the capacitor, the capacitance will

Question # 29

Three resistance 500,500 and 50 ohms are connected in series across 555 volts mains. The current flowing through them will be

Question # 30

For two resistance wires joined in parallel, the resultant resistance is 6/5 ohm. When one of the resistance wire breaks, the effective resistance becomes 2 ohm. The resistance of the broken wire is

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 In a voltmeter the conduction takes place due to
A. Electrons only
B. Holes only
C. Electrons and holes
D. Electrons and ions
2 One joule is equal to
A. 1.6 x 1019eV
B. 6.25 x 1018eV
C. 1.6 x 1818eV
D. 6.25 x 1019eV
3 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
4 If the distance of separation between two chares is increased, the electrical potential energy of the system will
A. Increase
B. Decrease
C. May increase or decrease
D. Remain the same
5 The minimum resistance that can be obtained by connecting 5 resistance of 1/4Ωeach is
A. 4/5Ω
B. 5/4Ω
C. 20Ω
D. 0.05 Ω
6 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)
A. Q/4πr2
B. 2Q/4πr2
C. Q.d
D. Zero
7 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
8 The unit of conductance is
A. ohm
B. meter
C. mho
D. ohm-meter
9 The electric field will be uniform
A. Near a positive point charge
B. Near a negative point charge
C. Between two oppositely charged parallel metal plates
D. None of above
10 A charge Q is divided into two parts q and Q - q and separated by a distance R. The force of repulsion between them will be maximum when
A. q = Q/4
B. q = Q/2
C. q = !
D. None of these

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