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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
Answer: (b) mg/e
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
Answer: (a) zero
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
Answer: (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
Answer: (a) 1042
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
Answer: (a) charged, neutral
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
Answer: (b) 1.6 × 1018ms-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
Answer: (a) increases
The dimensional representation of cu will be :
(a) [MLT4 A2]
(b) [M-1L-3T4A2]
(c)[ML-2T ]
(d) None of these
Answer: (b) [M-1L-3T4A2]
The dielectric constant of a metal is
(a) 0
(b) 1
(c) ∞
(d) -1
Answer: (c) ∞
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
Answer: (a) 6.25 × 1018
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
Answer: (a) always zero
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
Answer: (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
Answer: (a) valence electrons only
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
Answer: (a) +3q
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