Question 1

1) Assertion : The electrostatics force increases with decrease the distance between the charges.

Reason : The electrostatic force of attraction or repulsion between any two stationary point charges is inversely proportional to the square of the distance between them

a) Both A and R are true and R is the correct explanation of A

b) Both A and R are true but R is NOT the correct explanation of A

c) A is true but R is false

d) A is false and R is also false

Accepted Answer

a) Both A and R are true and R is the correct explanation of A

Answer

b) Both A and R are true but R is NOT the correct explanation of A

Answer

c) A is true but R is false

Answer

d) A is false and R is also false

Question 2

2) Assertion: The electric flux of the electric field ∮ E.d A is zero. The electric field is zero everywhere on the surface.

Reason:The charge inside the surface is zero.

a) Both A and R are true and R is the correct explanation of A

b) Both A and R are true but R is NOT the correct explanation of A

c) A is true but R is false

d) A is false and R is also false

Accepted Answer

d) A is false and R is also false

Answer

b) Both A and R are true but R is NOT the correct explanation of A

Answer

c) A is true but R is false

Answer

a) Both A and R are true and R is the correct explanation of A

Question 3

3) Assertion: The field in a cavity inside a conductor is zero which causes electrostatic shielding. Reason:Dielectric constant of conductors in electrostatics is infinite.

a) Both A and R are true and R is the correct explanation of A

b) Both A and R are true but R is NOT the correct explanation of A

c) A is true but R is false

d) A is false and R is also false

Accepted Answer

b) Both A and R are true but R is NOT the correct explanation of A

Answer

c) A is true but R is false

Answer

d) A is false and R is also false

Answer

a) Both A and R are true and R is the correct explanation of A

Question 4

4) Neutral atoms contain equal numbers of positive and negative . (a) Electrons and Protons (b) Protons and Electrons (c) Neutrons and Electrons (d) Protons and Neutrons

Accepted Answer

(b) Protons and Electrons

Answer

(c) Neutrons and Electrons

Answer

(a) Electrons and Protons

Answer

(d) Protons and Neutrons

Question 5

5) greater the charge on a given body, the divergence in the leaves will be… (a) smaller (b) greater (c) same (d) first smaller then greater

Accepted Answer

(b) greater

Answer

(d) first smaller then greater

Answer

(a) smaller

Answer

(c) same

Question 6

6) Magnitude of force between a pair of proton and proton is F and between a proton d electron is F’ then… (a) F = F’ (b) F > F’ (c) F< F’ (d) F >> F’

Accepted Answer

(a) F = F’

Answer

(c) F< F’

Answer

(d) F >> F’

Answer

(b) F > F’

Question 7

7) Earthing means… (a) to perform an experiment on Earth (b)to burry the device in the Earth (c) To put the device on Earth (d) Process of sharing charges with Earth

Accepted Answer

(d) Process of sharing charges with Earth

Answer

(a) to perform an experiment on Earth

Answer

(b)to burry the device in the Earth

Answer

(c) To put the device on Earth

Question 8

8) If a negatively charged rod touches a conductor, the conductor will be charged by what method? (a) Friction (b) Conduction (c)Convection (d) Induction

Accepted Answer

(b) Conduction

Answer

(d) Induction

Answer

(c)Convection

Answer

(a) Friction

Question 9

9) When you charge a balloon by rubbing it on your hair this is an example of what method of charging?

(a)Friction (b)Conduction (c)Grounding(d)Induction

Accepted Answer

(a)Friction

Answer

(c)Grounding

Answer

(b)Conduction

Answer

(d)Induction

Question 10

10) Neutral atoms contain equal numbers of positive__ and negative __.

(a)Electrons and Protons (b)Protons and Electrons

(c)Neutrons and Electrons (d)Protons and Neutrons

Accepted Answer

(b)Protons and Electrons

Answer

(a)Electrons and Protons

Answer

(d)Protons and Neutrons

Answer

(c)Neutrons and Electrons

Question 11

11) Which particle in an atom can you physically manipulate?

(a)protons(b)electrons (c)neutrons (d)you can't manipulate any particle in an atom

Accepted Answer

(b)electrons

Answer

(a)protons

Answer

(c)neutrons

Answer

(d)you can't manipulate any particle in an atom

Question 12

12) What do you call the process of charging a conductor by bringing it near another charged object? (a) Induction (b)Polarisation (c) neutralization (d) conduction

Accepted Answer

(a) Induction

Answer

(d) conduction

Answer

(c) neutralization

Answer

(b)Polarisation

Question 13

13) If a negatively charged rod touches a conductor, the conductor will be charged by what method?

(a) Friction (b)Conduction(c)Induction (d)Convection

Accepted Answer

(b)Conduction

Answer

(a) Friction

Answer

(d)Convection

Answer

(c)Induction

Question 14

14) What is the SI unit of electric flux?

(a) (N/C) * m² (b) N * m² (c)N/m² (d)(N² /m² ) * C²

Accepted Answer

(a) (N/C) * m²

Answer

(c)N/m2

Answer

(b) N * m²

Answer

(d)(N² /m² ) * C²

Question 15

15) ∫ 𝐸. 𝑑𝑆= 0, inside a surface, that means there is..

(a) Charge present inside the surface.(b)uniform electric field inside the surface

(c) discontinuous field lines inside the surface (d) some the charge present inside the surface

Accepted Answer

(a) Charge present inside the surface.

Answer

(d) some the charge present inside the surface

Answer

(c) discontinuous field lines inside the surface

Answer

(b)uniform electric field inside the surface

Question 16

16) For a given surface the Gauss’s law is stated as∫ 𝐸.𝑑𝑆= 0. From this we can conclude that.. (a) E is necessarily zero on the surface.(b) E is perpendicular to the surface at every point

(c) the total flux through the surface is zero (d)the flux is only going out of the surface.

Accepted Answer

(c) the total flux through the surface is zero

Answer

(b) E is perpendicular to the surface at every point

Answer

(a) E is necessarily zero on the surface

Answer

(d)the flux is only going out of the surface.

Question 17

17) When charge is supplied to a conductor, its potential depends upon

(a) the amount of charge (b) Geometry & size of conductor (c) both (a)&(b) (d) only on(a)

Accepted Answer

(c) both

Answer

(b) Geometry & size of conductor

Answer

(a) the amount of charge

Answer

(d) only on(a)

Question 18

18) A parallel plate capacitor is charged by a battery. Once it is charged battery is removed. Now a dielectric material is inserted between the plates of the capacitor, which of the following does not change?

(a) electric field between the plates (b)potential difference across the plates

(c) charge on the plates (d) energy stored in the capacitor.

Accepted Answer

(c) charge on the plates

Answer

(b)potential difference across the plates

Answer

(d) energy stored in the capacitor.

Answer

(a) electric field between the plates

Question 19

19) A dipole is placed parallel to electric field. If W ist he work done in rotating the dipole from 0° to 60°, then work done in rotating it from 0° to 180°is

(a) 2 W (b) 3W (c) 4W (d) W/2

Accepted Answer

(c) 4W

Answer

(d) W/2

Answer

(b) 3W

Answer

(a) 2 W

Question 20

20) Three capacitors of capacitances 1µf, 2µF & 3µF are connected in series and a potential difference of 11V is applied across the combination them the potential difference across the plates of 1µF capacitor is (a) 2V (b)4V (c) 1V (d)6V

Accepted Answer

(d)6V

Answer

(c) 1V

Answer

(a) 2V

Answer

(b)4V

Question 21

21) The electric field at the Centre of a cavity is- (a)Zero (b) kq /a² (c) kq/a (d) kq/2a²

Accepted Answer

(a)Zero

Answer

d) kq/2a2

Answer

(b) kq /a²

Answer

(c) kq/a

Question 22

22) Two conducting spheres A and B of radii a & b respectively are at the same potential. The ratio of surface charge densities of A and B is (a) b/a (b) a/b (c) a² /b² (d) b²/a²

Accepted Answer

(a) b/a

Answer

(c) a² /b²

Answer

(b) a/b

Answer

(d) b²/a²

Question 23

23) Work done to bring a unit positive charge un-accelerated from infinity to a point inside electric field is called: (a) Electric field(b) Electric potential (c) Capacitance (d) Electric flux

Accepted Answer

(b) Electric potential

Answer

(c) Capacitance

Answer

(a) Electric field

Answer

(d) Electric flux

Question 24

24) Electric field is always:

(a) Parallel to equipotential surface (b) Perpendicular to equipotential surface

(c) It can be perpendicular and parallel as well (d) It doesnot depend on distribution of charge

Accepted Answer

(b) Perpendicular to equipotential surface

Answer

(d) It doesnot depend on distribution of charge

Answer

(a) Parallel to equipotential surface

Answer

(c) It can be perpendicular and parallel as well

Question 25

25) Electric field and electric potential inside a charged spherical shell:

(a) E = 0; V= 0 (b) E = 0; V ≠0 (c) E ≠ 0; V= 0 (d) E ≠ 0; V≠0

Accepted Answer

(b) E = 0; V ≠0

Answer

(d) E ≠ 0; V≠0

Answer

(c) E ≠ 0; V= 0

Answer

(a) E = 0; V= 0

Question 26

26) Shape of equipotential surface in uniform electric field will be:

(a) Spherical normal to electric field (b) Random

(c) circular normal to electric field (d) Equidistant Planes normal to electric field

Accepted Answer

(d) Equidistant Planes normal to electric field

Answer

(b) Random

Answer

(c) circular normal to electric field

Answer

(a) Spherical normal to electric field

Question 27

27) On reducing potential across a capacitor, its capacitance: (a) Decreases (b) Increases (c) Remains constant (d) First increases then decreases

Accepted Answer

(c) Remains constant

Answer

(a) Decreases

Answer

(b) Increases

Answer

(d) First increases then decreases

Question 28

28) A spherical conductor has charge Q on its surface.Radius of the conductor is R. Which of the following is correct?

(a) Electric Potential is a non-zero constant (b) Electric Potential is a constant

(c) Electric Field is zero (d) Electric Field is a non-zero constant

Accepted Answer

(a) Electric Potential is a non-zero constant

Answer

(d) Electric Field is a non-zero constant

Answer

(b) Electric Potential is a constant

Answer

(c) Electric Field is zero

Question 29

29) The electrostatic potential on the surface of a charged conducting sphere is 200 V. Two statements are made in this regard:

S1 : At any point inside the sphere, electric intensity iszero.

S2 : At any point inside the sphere, the electrostatic potential is 200V. Which of the following is a correct statement?

(a) S1 is true but S2 is false. (b) Both S1 & S2 are false.

(c) S1 is False but S2 is true. (d) both S1 and S2 are true..

Accepted Answer

(d) both S1 and S2 are true..

Answer

(b) Both S1 & S2 are false.

Answer

(c) S1 is False but S2 is true.

Answer

(a) S1 is true but S2 is false.

Question 30

30) If I place an second uniformly charge shell (Q) of radius R'>R, will the value of

potential change at r

(a) increases

(b) decreases

(c) constant

(d) none of the above

Accepted Answer

(a) increases

Answer

(c) constant

Answer

(b) decreases

Answer

(d) none of the above

Question 31

31) The electric charges are distributed in a small volume.The flux of the electric field through a spherical surface of radius 10 cm surrounding the total charge is 20 Vm. The flux over a concentric sphere ofradius 20 cm will be

(a) 20 Vm. (b) 25 Vm. (c) 40 Vm. (d) 200 Vm.

Accepted Answer

(a) 20 Vm.

Answer

(b) 25 Vm.

Answer

(c) 40 Vm.

Answer

(d) 200 Vm.

Question 32

32) A soap bubble is given negative charge, its radius will

(a) Increase (b) decrease (c) remains unchanged (d)fluctuate

Ans. (a)

Accepted Answer

(a) Increase

Answer

(c) remains unchanged

Answer

(d)fluctuate

Answer

(b) decrease

Question 33

33) Three charges Q, +q and +q is placed at the vertices of a right-angled triangle of side ‘a’. The net electrostatic energy of the configuration is zero, if Q is equal to-

(a) -q/(1+√2) (b) -2q/(2+√2) (c) -2q (d) +q

Accepted Answer

(b) -2q/(2+√2)

Answer

(a) -q/(1+√2)

Answer

(c) -2q (d) +q

Question 34

34) The electrostatic force between the metal plates of an isolated parallel plate capacitor C having a charge Q and area A, is

(a) proportional to the square root of the distance between the plates.

(b) linearly proportional to the distance between the plates.

(c) independent of the distance between the plates.

(d) inversely proportional to the distance between the plates.

Accepted Answer

(c) independent of the distance between the plates.

Answer

(d) inversely proportional to the distance between the plates.

Answer

(b) linearly proportional to the distance between the plates.

Answer

(a) proportional to the square root of the distance between the plates

Question 35

35) A capacitor is charged by a battery. The battery is removed and another identical uncharged capacitor is connected in parallel. The total electrostatic energy of resulting system

(a) increases by a factor of 4. (b) decreases by a factor of2.

(c) remains the same. (d) increases by a factor of 2.

Accepted Answer

(b) decreases by a factor of2.

Answer

(d) increases by a factor of 2.

Answer

(c) remains the same.

Answer

(a) increases by a factor of 4.

Question 36

36) 64 drops each having the capacity C and potential V are combined to form a big drop. If the charge on the small drop is q, then the charge on the big drop will be

(a) 2q (b) 4q (c) 16q(d) 64q

Accepted Answer

(d) 64q

Answer

(c) 16q

Answer

(b) 4q

Answer

(a) 2q

Question 37

37) A parallel plate condenser is connected with the terminals of a battery. The distance between the plates is 6mm. If a glass plate (dielectric constant K = 9) of 4.5 mm is introduced between them, then the capacity will become

(a) 2 times. (b) the same. (c) 3 times. (d) 4 times.

Accepted Answer

(c) 3 times.

Answer

(d) 4 times.

Answer

(a) 2 times.

Answer

(b) the same.

Question 38

38) A capacitor is charged by using a battery which is then disconnected. A dielectric slab then slipped between the plates, which results in

(a) reduction of charge on the plates and increase of potential difference across the plates

(b) increase in the potential difference across the plate,reduction in stored energy, but no change in the charge on the plates

c) decrease in the potential difference across the plates,reduction in the stored energy, but no change in the charge on the plates.

(d) none of these

Accepted Answer

c) decrease in the potential difference across the plates,reduction in the stored energy, but no change in the charge on the plates.

Answer

(b) increase in the potential difference across the plate,reduction in stored energy, but no change in the charge on the plates

Answer

(d) none of these

Answer

(a) reduction of charge on the plates and increase of potential difference across the plates

Question 39

39) In a parallel plate capacitor, the capacity increases if

(a) area of the plate is decreased (b) distance between the plates increases.

(c) area of the plate is increased. (d) dielectric constantly decreases

Accepted Answer

(c) area of the plate is increased.

Answer

(b) distance between the plates increases.

Answer

(a) area of the plate is decreased

Answer

(d) dielectric constantly decreases

Question 40

40) If a negatively charged rod touches a conductor, the conductor will be charged by what method?

(a) Friction (b)Conduction(c)Induction (d)Convection

Accepted Answer

(b)Conduction

Answer

(c)Induction

Answer

(d)Convection

Answer

(a) Friction

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