ECAT Pre Engineering Physics Chapter 12 MCQ Test With Answer

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

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

Question # 2

A parallel plate capacitor is first charged and then a dielectric slab is introduced between the plates. The quantity that remains unchanged is

Question # 3

Battery is charged in motor cars, which is based on

Question # 4

A uniform resistance wire of Length L and diameter d has a resistance R. Another wire of same material has length, 4L and diameter 2d, the resistance will be

Question # 5

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

Question # 6

Equal charges are given to two spheres of different radii. The potential will

Question # 7

The electric field will be uniform

Question # 8

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

Question # 9

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 # 10

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 # 11

What is the current is a 2 x 106ohm resistor having a potential difference of 2 x 103volts?

Question # 12

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

Question # 13

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 # 14

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

Question # 15

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

Question # 16

If a 40 watt light bulb burns for 2 hours. how much heat is generated

Question # 17

The SI unit of capacitance is

Question # 18

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

Question # 19

A capacitor is charged with a battery and then it is disconnected. A slab of dielectric is now inserted between the plates, then

Question # 20

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 # 21

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

Question # 22

Potentiometer is more sensitive than voltmeter, because

Question # 23

Three resistors of resistance R each are combined in various ways. Which of the following cannot be obtained?

Question # 24

Electric generators which convert mechanical energy into

Question # 25

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

Question # 26

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 # 27

The resistance of 20 cm long wire is 10Ω. When the length is changed to 40 cm. The new resistance is

Question # 28

The nature of capacity of electrostatic capacitor depends on

Question # 29

One coulomb per second is equal to

Question # 30

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

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 Electric flux is defined by the relation
A. E.A.
B. E x A
C. E/A
D. none of these
2 If the length of the conductor is double and its cross sectional area is halved, its conductance will
A. Increase four fold
B. Become one-fourth
C. Become one-half
D. Remains unchanged
3 Surface density of charge is defined as
A. Charge per unit volume
B. Charge per unit length
C. Charge per unit area
D. Charge per unit mass
4 The resistance of a conductor does not depend on its
A. mass
B. resistivity
C. length
D. cross-sectional area
5 Two electric bulbs of 200 W and 100 W have same voltage. If R1and R2be their resistance respectively then
A. R1= 2R2
B. R2= 2R1
C. R2 = 4R1
D. R1= 4R2
6 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
7 A one microfarad capacitor of a TV is subjected to 4000 V potential difference. The energy stored in capacitor is
A. 8 J
B. 16 J
C. 4 x 10-3J
D. 2 x 10-3J
8 The speed of randomly moving electrons depends upon
A. pressure
B. volume
C. temperature
D. mass
9 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
A. 0.1 watt
B. 1 watt
C. 10 watt
D. 100 watt
10 The energy stored in a charge capacitor
A. 1/2CV2
B. 1/2C2V
C. 1/2C/V2
D. None of these

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