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 Electric Charges and Fields Class 12 Physics MCQs Pdf

Q. The surface considered for Gauss’s law is called

(a) Closed surface

(b) Spherical surface

(c) Gaussian surface

(d) Plane surface

Answer: c

Q. Which of the following statements is not true about Gauss’s law?

(a) Gauss’s law is true for any closed surface.

(b) The term q on the right side side of Gauss’s law

includes the sum of all charges enclosed by the surface.

(c) Gauss’s law is not very useful in calculating electrostatic fields when the system has

some symmetry.

(d) Gauss’s law is based on the inverse square dependence on distance contained in the

coulomb’s law

Answer: c

Q. The force per unit charge is known as

(a) electric flux

(b) electric field

(c) electric potential

(d) electric current

Answer: b

Q. Electric field lines provide information about

(a) field strength

(b) direction

(c) nature of charge

(d) all of these

Answer: d

Q. The SI unit of electric flux is

(a) N C-¹ m-²

(b) N C m-²

(c) N C-² m²

(d) N C-¹ m2

Answer: d

9. The unit of electric dipole moment is

(a) newton

(b) coulomb

(c) Faraday

(d) debye

Answer: d

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Q. In comparison with the electrostatic force between two electrons, the electrostatic

force between two protons is:

(a) greater

(b) smaller

(c) zero

(d) same.

Answer: (d) same

Q. The position of the charge inside the enclosing surface is changed in such a way that

the total charge remains constant. Then the total normal electric flux through the

enclosing surface:

(a) increases

(b) decreases

(c) changes erratically

(d) Remains unchanged

Answer: (d) Remains unchanged

Q. If the sizes of charged bodies are very small compared to the distances between them,

we treat them as ____________.

1. Zero charges

2. Point charges

3. Single charge

4. No charges

Answer: (b) Point charges

Q. If a body is charged by rubbing it, its weight

1. Always decrease slightly

2. Always increase slightly

3. May increase or decrease slightly.

4. No change in weight

Answer: (c) May increase or decrease sligh

Q. The quantisation of charge indicates that

1. Charge, which is a fraction of charge on an electron, is not possible

2. A charge cannot be destroyed

3. Charge exists on particles

4. There exists a minimum permissible charge on a particle

Answer: (a) Charge, which is a fraction of charge on an electron, is not possible

Q. What happens when a glass rod is rubbed with silk?

1. gains protons from silk

2. gains electrons from silk

3. gives electrons to silk

4. gives protons to silk

Answer: (a) gains protons from silk.

Q. Force per unit charge is ____

1. Electric current

2. Electric flux

3. Electric field

4. Electric potential

Answer: (c) Electric field

Q. An electric dipole is placed in a uniform electric field. The net electric force on the

dipole.

1. Is always zero

2. Depends on the orientation

3. Depends on the dipole moment

4. Is always finite but not zero

Answer: (c) Is always zero

Q. When the separation between two charges is increased the electric potential energy of

the charges

1. Increases

2. Decreases

3. remains the same

4. may increase or decrease

Answer: (b) Decreases

Q. Why is gold used in the Gold-leaf electroscope?

a) Gold is easily available in nature

b) Gold is malleable

c) Gold is conducting in nature

d) Gold is cheap

Ans. B

Q. Gold-leaf electroscope can be used _______

a) Only to detect the presence of charge

b) To detect the presence of charge as well as its nature (positive or negative)

c) To measure the surface charge density

d) To measure current

Ans. B

Q. 1 Coulomb = ________ Electro Static Unit.

a) 3×10⁹

b) 3×10⁸

c) 1.602×10-¹⁹

d) 2×10⁹

Ans. A

Q. Question: On rubbing, when one body gets positively charged and other negatively

charged, the electrons transferred from positively charged body to negatively charged

body are

(a) valence electrons only

(b) electrons of inner shells

(c) both valence electrons and electrons of inner shell

(d) yet to be established

Answer: A

Question: Which of the following is the best insulator?

(a) Carbon

(b) Paper

(c) Graphite

(d) Ebonite

Answer: D

Question: If a body is negatively charged, then it has

(a) excess of electrons

(b) excess of protons

(c) deficiency of electrons

(d) deficiency of neutrons

Ans. A

Question: When a body is charged by induction, then the body

(a) becomes neutral

(b) does not lose any charge

(c) loses whole of the charge on it

(d) loses part of the charge on it

Answer: B

Question: On charging by conduction, mass of a body may

(a) increase

(b) decreases

(c) increase or decrease

(d) None

Ans. C

Q. Question: A region surrounding a stationary electric dipoles has

(a) magnetic field only

(b) electric field only

(c) both electric and magnetic fields

(d) no electric and magnetic fields

Answer: B

Question: The electric field at a point on equatorial line of a dipole and direction of the

dipole moment

(a) will be parallel

(b) will be in opposite direction

(c) will be perpendicular

(d) are not related

Answer: B

Question: Debye is the unit of

(a) electric flux

(b) electric dipole moment

(c) electric potential

(d) electric field intensity

Answer: B

Question: An electric dipole will experience a net force when it is placed in

(a) a uniform electric field

(b) a non-uniform electric field

(c) both (a) and (b)

(d) None of these

Answer: B