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

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

Question # 3

A 10 F capacitor is charged to a potential difference of 50 V and is connected to another uncharged capacitor in parallel. Now the common potential difference becomes 20 volt.The capacitance of second capacitor is

Question # 4

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 # 5

The conventional current in a circuit is defined as " current which passes from a point at higher potential to a point at lower potential as if it represent a movement of

Question # 6

The electric intensity at infinite distance from the point charge will be

Question # 7

Ohm is the unit of

Question # 8

If a charged spherical conductor of radius 10 cm has potential V at a point distance 5 cm from its centre, then the potential at a point distance 15 cm from the centre will be

Question # 9

The speed of randomly moving electrons depends upon

Question # 10

The relation between the charge Q of a parallel plate capacitor and the P.D between its plates is

Question # 11

The potential difference across the conductors should be maintained constant by connecting the ends of wire to the terminal of a device called a source of

Question # 12

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

Question # 13

Capacitance of two or more capacitors

Question # 14

A car battery has e.m.f 12 volt and internal resistance 5 x 10-2ohm. If it draws 60 ampere current, the terminal voltage of the battery will be

Question # 15

Electron volt is the unit of.

Question # 16

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

Question # 17

The concept of field theory was put forward by

Question # 18

The electric flux from a closed surface

Question # 19

The force between two chares 0.06 m apart is 5 N. If each charge is moved towards the other by 0.01 m, then the force between them will become

Question # 20

Resistance of a conductor is increased, the currant will

Question # 21

Free electrons are

Question # 22

When an electron is accelerated through a P.D. of an one volt, it will acquire energy equal to

Question # 23

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 # 24

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

Question # 25

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 # 26

The charge carriers in electrolyte are positive and negative

Question # 27

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

Question # 28

The electrode connected with the positive terminal of the current source is called

Question # 29

A sheet of aluminium foil of negligible thickness is introduced between the plates of a capacitor. The capacitance of the capacitor

Question # 30

The capacity of a parallel plat capacitor depends on the

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 When a dielectric material is introduced between the plates of a charged condenser the electric field between the plates
A. Decreases
B. Increases
C. No change
D. May increase or decresase
2 The graphical representation of ohm's law is
A. hyperbola
B. straight line
C. ellipse
D. parabola
3 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
A. -10 N
B. +10 N
C. +20 N
D. -20 N
4 The electric lines of force are
A. Imaginary
B. Physically existing everywhere
C. Physically existing near the charge
D. All of the above
5 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
6 The earth's potential is taken as
A. Negative
B. Positive
C. Zero
D. Infinite
7 If an electron of charge 'e' is accelerated through a potential difference V., it will acquire energy
A. Ve
B. V/e
C. e/V
D. 2Ve
8 The resistance of a conductor does not depend on its
A. mass
B. resistivity
C. length
D. cross-sectional area
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 The electric field intensity at a point due to a point charge
A. Falls off inversely as the distance
B. Falls off inversely as the square of distance
C. Remains unchanged with distance
D. Increase directly as square of distance

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