ECAT Pre General Science Physics Chapter 12 MCQ Test With Answer

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

Try The 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

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

Question # 2

Electron volt is the unit of

Question # 3

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

Question # 4

The SI unit of electric flux is

Question # 5

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

Question # 6

Which one of the following is the unit of electric field intensity

Question # 7

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 # 8

A 50 volt battery is connected across 10 ohm resistor. The current is 4.5 A. The internal resistance of the battery is

Question # 9

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

Question # 10

If the distance between the plates of a parallel plate condenser of capacity 10μF is doubled then new capacity will be

Question # 11

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 # 12

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

Question # 13

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

Question # 14

If the distance of separation between two chares is increased, the electrical potential energy of the system will

Question # 15

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

Question # 16

Which of the following represents an electric current?

Question # 17

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 # 18

In a charged capacitor the energy is stored in

Question # 19

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

Question # 20

A one microfarad capacitor of a TV is subjected to 4000 V potential difference. The energy stored in capacitor is

Question # 21

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

Question # 22

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

Question # 23

The resistance of an incandescent lamp is

Question # 24

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 # 25

Ohm is the unit of

Question # 26

Ohm established a relation between

Question # 27

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 # 28

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

Question # 29

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

Question # 30

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

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 A conducting wire is drawn to double its length. Final resistivity of the material will be
A. Double of the original one
B. Half of the original one
C. One fourth of the original one
D. Same as original one
2 Consider a spherical shell of metal at he centre of which a positive point charge is kept
A. The electric filed is zero outside the shell
B. The electric field is zero everywhere
C. The electric field is zero in the region inside the shell
D. The electric field is non-zero in both regions outside and inside the shell
3 The fractional change in resistance per kelvin is known as
A. temperature coefficient
B. resistance coefficient
C. super temperature
D. critical temperature
4 The resistivity of a substance depends upon the
A. length
B. mass
C. area
D. temperature
5 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
6 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
7 A ten ohm electric heater operates on a 110 V line. Calculate the rate at which it develops heat in watts
A. 1310 W
B. 670 W
C. 810 W
D. 1210 W
8 In RC series circuit the time during which the capacitor acquires 0.63 times the equilibrium charge is called
A. Time constant
B. Decay constant
C. None of these
D. All of above
9 Two point charges A and B separated by a distance R attract each other with a force of 12 x 10-3N. The force between A and B when the charges on them are doubled and distance is halved
A. 1.92 N
B. 19.2 N
C. 12 N
D. 0.192 N
10 Which one of the following is the unit of electric field intensity
A. JC-1
B. Vm-1
C. Cm-1
D. CJ-1

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