## Class 12 Physics MCQs Electric Charges And Fields for JEE/NEET

Here, you will get Class 12 Physics MCQ of Chapter 1 Electric Charges And Fields for cracking JEE and NEET/AIIMS. By solving these MCQs of Class 12 Physics Chapter 1 Electric Charges And Fields, you will get the confidence to crack JEE or NEET. Practice MCQ Questions for Class 12 Physics with Answers on a daily basis and score well in exams.

## Electric Charges And Fields Class 12 MCQs Questions with Answers

Gauss’s law will be invalid if
(a) there is magnetic monopole
(b) the inverse square law is not exactly true
(c) the velocity of light is not a universal constant
(d) none of these

Answer: (b) the inverse square law is not exactly true

A parrot comes and sits on a bare high power line. It will:
(a) experience a mild shock
(b) experience a strong shock.
(c) get killed instantaneously
(d) not be affected practically

Answer: (d) not be affected practically

Quantisation of charge implies
(a) Charge does not exist
(b) Charge exists on particles
(c) There is a minimum permissible magnitude of charge
(d) Charge can’t be created

Answer: (c) There is a minimum permissible magnitude of charge

The magnitude of electric field intensity E is such that, an electron placed in it would experience an electrical force equal to its weight is given by
(a) mge
(b) mg/e
(c) e/mg
(d) e²g/m²

The electric field inside a spherical shell of uniform surface charge density is
(a) zero
(b) constant, less than zero
(c) directly proportional to the distance from the centre
(d) none of the these

The graph drawn between V are r for a non-conducting charged solid sphere of radius R for r < R will be
(a) straight line
(b) parabola
(c) hyperbola
(d) None of these

The ratio of electric force between two electrons to the gravitational force between them is of the order
(a) 1042
(b) 1039
(c) 1036
(d) 1

Corona discharge takes place
(a) at the surface of a conductor
(b) near the sharp points of a conductor
(c) outside the conductor
(d) at the centre of the conductor

Answer: (b) near the sharp points of a conductor

If an object possesses an electric charge, it is said to be electrified or … A … When it has no charge, it is said to be … B … Here, A and B refer to
(a) charged, neutral
(b) neutral, charged
(c) discharged, charged
(d) active, reactive

An electron is sent in an electric field of magnitude 9.1 × 106NC-1. The acceleration produced in it is :
(a) 1.6 ms-2
(b) 1.6 × 1018ms-2
(c) 3.2 × 1018ms-2
(d) 0.8 × 1018 ms-2

Two similar spheres having +Q and -Q charges are kept at a certain distance. F force acts between the two. If at the middle of two spheres, another similar sphere having +Q charge is kept, then it experiences a force in magnitude and direction as
(a) zero having no direction
(b) 8F towards +Q charge
(c) 8F towards -Q charge
(d) 4F towards +Q charge

Answer: (c) 8F towards -Q charge

When a glass rod is rubbed with silk, it
(a) gains electrons from silk
(b) gives electrons to silk
(c) gains protons from silk
(d) gives protons to silk

Answer: (c) gains protons from silk

A soap bubble is given a negative charge, then its radius
(a) increases
(b) decreases
(c) remains unchanged
(d) may increase or decrease

The dimensional representation of cu will be :
(a) [MLT4 A2]
(b) [M-1L-3T4A2]
(c)[ML-2T ]
(d) None of these

The dielectric constant of a metal is
(a) 0
(b) 1
(c) ∞
(d) -1

The work done in rotating an electric dipole in an electric field
(a) W = ME (1 – cos θ)
(b) W = ME tan θ
(c) W = ME sec θ
(d) None

Answer: (a) W = ME (1 – cos θ)

The number of electron-taken out from a body to produce 1 coulomb of charge will be
(a) 6.25 × 1018
(b) 625 × 1018
(c) 6.023 × 1023
(d) None

If an electric dipole is kept in a uniform electric field then resultant electric force on it is
(a) always zero
(b) never zero
(c) depend upon capacity of dipole
(d) None

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 much useful in calculating electrostatic field 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) Gauss’s law is not much useful in calculating electrostatic field when the system has some symmetry

Coulomb’s law is true for
(a) atomic distances (= 10–11 m)
(b) nuclear distances (= 10–15 m)
(c) charged as well as uncharged particles
(d) all the distances

Quantisation of charge was experimentally demonstrated by
(a) Einstein’s photoelectric effect
(b) Frank-Hertz experiment
(c) Davisson and Germer experiment
(d) Millikan’s oil drop experiment

Answer: (d) Millikan’s oil drop experiment

When a comb rubbed with dry hair attracts pieces of paper. This is because the
(a) comb polarizes the piece of paper
(b) comb induces a net dipole moment opposite to the direction of field
(c) electric field due to the comb is uniform
(d) comb induces a net dipole moment perpendicular to the direction of field

Answer: (a) comb polarizes the piece of paper

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

A body is positively charged, it implies that
(a) there is only positive charge in the body.
(b) there is positive as well as negative charge in the body but the positive charge is more than negative charge
(c) there is equal positive and negative charge in the body but the positive charge lies in the outer regions
(d) negative charge is displaced from its position

Answer: (b) there is positive as well as negative charge in the body but the positive charge is more than negative charge

Three charges + 3q + q and Q are placed on a st. line with equal separation. In order to maket the net force on q to be zero, the value of Q will be
(a) +3q
(b) +2q
(c) -3q
(d) -4q