ECAT Pre General Science Physics Chapter 12 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 12 Electrostatics

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ECAT Pre General Science Physics Chapter 12 Electrostatics

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Question # 1

Force acting upon a charged particle kept between the plates of a charged condenser if F. IF one of the plates of the condenser is removed, force acting on the same will become

Question # 2

Calculate the amount of charge flowing in 2 minutes in a wire of resistance 10Ωwhen a potential difference of 20 V is applied between its ends

Question # 3

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

Question # 4

At any point on the right bisector of the line joining two equal and opposite charges

Question # 5

The material in the form of wire or rod or plate which leads the current into or cut of the electrolyte is known as

Question # 6

One electron volt is equal to

Question # 7

The unit of conductance is

Question # 8

The dot product of electric field intensity E and vector area A is called

Question # 9

The electric intensity outside the two oppositely charged parallel metal plates is

Question # 10

The minimum resistance that can be obtained by connecting 5 resistance of 1/4Ωeach is

Question # 11

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

Question # 12

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 # 13

The electric field will be uniform

Question # 14

In a building, there are 15 bulbs of 40 watts, 5 bulbs of 100 watts, 5 fans of 80 watts and a heater of 1 kilowatt. The voltage of the electric main is 220 volts. The minimum efficiency of the main fuse of the building will be

Question # 15

The SI unit of electric flux is

Question # 16

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 # 17

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

Question # 18

One coulomb per second is equal to

Question # 19

The unit of resistivity is

Question # 20

Coulomb force, when any material medium is placed between two charges

Question # 21

Three resistors of resistance 2,3 and 6 ohms are connected in parallel, their equivalent resistance is

Question # 22

Surface density of charge is defined as

Question # 23

Free electrons are

Question # 24

A piece of fuse wire melts when a current of 15 ampere flows through it. With this current. If it dissipates 22.5 W, the resistance of fuse wire will be

Question # 25

The value of electrical constant of proportionality k is

Question # 26

The current through a metallic conductor is due to the motion of

Question # 27

A capacitor of capacity 1μF is charged to 1 KV. The energy stored in J

Question # 28

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

Question # 29

A current of 1.6 A is passed through a solution of CuSO4. How many Cu2+ions are liberated in one minute?

Question # 30

An electron of charge e coulomb passes through a potential difference of V volts its energy in joules will be

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ECAT Class Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 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
A. 3.9
B. 4
C. 4.2
D. 6
2 The conductivity of a superconductor is
A. Infinite
B. Very large
C. Very small
D. Zero
3 The relation between charge 'Q' and current 'I' is given by
A. Q = I/t
B. Q = It
C. Q = I2t
D. Q = I2/t
4 The thermistors are usually made of
A. Metals with low temperature coefficient of resistivity
B. Metals with high temperature coefficient of resistivity
C. Metal oxides with high temperature coefficient of resistivity
D. Semi conducting materials having low temperature coefficient of resistivity
5 If the distance between the plates of a parallel plate condenser of capacity 10μF is doubled then new capacity will be
A. 5μF
B. 20μF
C. 10μF
D. 15μF
6 If we increase the distance between two plates of the capacitor, the capacitance will
A. Increase
B. Decrease
C. Remain same
D. First increase then decrease
7 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
8 The electric field due to an infinite long thin wire at a distance R varies as
A. 1/R
B. 1/R2
C. R
D. R2
9 The SI unit of electric flux is
A. Weber
B. Nm2C-1
C. NmC-1
D. Nm-2C
10 The concept of field theory was put forward by
A. Franklin
B. Kepler
C. Oersted
D. Michael Faraday

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