Question: A point charge + q is placed at a distance d from an isolated conducting plane. The field at a point P on the other side of the plane is
(a) directed perpendicular to the plane and away from the plane
(b) directed perpendicular to the plane but towards the plane
(c) directed radially away from the point charge
(d) directed radially towards the point charge
Answer: A
Question: A hemisphere is uniformely charged positively. The electric field at a point on a diameter away from the centre is directed
(a) perpendicular to the diameter
(b) parallel to the diameter
(c) at an angle tilted towards the diameter
(d) at an angle tilted away from the diameter
Answer: A
Question: Assertion : The positive charge particle is placed in front of a spherical uncharged conductor. The number of lines of forces terminating on the sphere will be more than those emerging from it.
Reason : The surface charge density at a point on the sphere nearest to the point charge will be negative and maximum in magnitude compared to other points on the sphere.
(a) If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
(b) If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
(c) If Assertion is correct but Reason is incorrect.
(d) If both the Assertion and Reason are incorrect.
Answer: D
Question: An electron falls from rest through a vertical distance h in a uniform and vertically upward directed electric field E. The direction of electric field is now reversed, keeping its magnitude the same. A proton is allowed to fall from rest in it through the same vertical distance h. The time of fall of the electron, in comparison to the time of fall of the proton is
(a) smaller
(b) 5 times greater
(c) equal
(d) 10 times greater
Answer: A
Question: Charge is the property associated with matter due to which it produces and experiences
(a) electric effects only
(b) magnetic effects only
(c) both electric and magnetic effects
(d) None of these
Answer: C
Question: Charge is
(a) transferable
(b) associated with mass
(c) conserved
(d) All of these
Answer: D
Question: 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
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: 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 of these
Answer: C
Question: Quantisation of charge implies
(a) charge cannot be destroyed
(b) charge exists on particles
(c) there is a minimum permissible charge on a particle
(d) charge, which is a fraction of a coulomb is not possible.
Answer: D
Question: 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
Question: A positively charged rod is brought near an uncharged conductor. If the rod is then suddenly withdrawn, the charge left on the conductor will be
(a) positive
(b) negative
(c) zero
(d) cannot say
Answer: C
Question: Two spheres A and B of exactly same mass are given equal positive and negative charges respectively. Their masses after charging
(a) remains unaffected
(b) mass of A > mass of B
(c) mass of A < mass of B
(d) Nothing can be said
Answer: C
Question: 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
Question: When some charge is transferred to ...A... it readily gets distributed over the entire surface of ... A... If some charge is put on ... B..., it stays at the same place.
Here, A and B refer to
(a) insulator, conductor
(b) conductor, insulator
(c) insulator, insulator
(d) conductor, conductor
Answer: B
Question: 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
Question: In annihilation process, in which an electron and a positron transform into two gamma rays, which property of electric charge is displayed?
(a) Additivity of charge
(b) Quantisation of charge
(c) Conservation of charge
(d) Attraction and repulsion
Answer: C
Question: The law, governing the force between electric charges is known as
(a) Ampere's law
(b) Ohm's law
(c) Faraday's law
(d) Coulomb's law
Answer: D
Question: The value of electric permittivity of free space is
(a) 9 × 109 NC2/m2
(b) 8.85 × 10–12Nm2/C2 sec
(c) 8.85 × 10–12 C2/Nm2
(d) 9 × 109C2/Nm2
Answer: C
Question: 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: A
Question: What happens when some charge is placed on a soap bubble?
(a) Its radius decreases
(b) Its radius increases
(c) The bubble collapses
(d) None of these
Answer: B
Question: Two point charges + Q and + q are separated by a certain distance. If + Q > + q then in between the charges the electric field is zero at a point
(a) closer to + Q
(b) closer to + q
(c) exactly at the mid-point of line segment joining + Q and + q.
(d) no where on the line segment joining + Q and + q.
Answer: C
Question: An electric field can deflect
(a) neutrons
(b) X-rays
(c) γ-rays
(d) α-particles
Answer: D
Question: The unit of electric field is not equivalent to
(a) N / C
(b) J / C
(c) V / m
(d) J / Cm
Answer: B
Question: If an electron has an initial velocity in a direction different from that of an electric field, the path of the electron is
(a) a straight line
(b) a circle
(c) an ellipse
(d) a parabola
Answer: D
Question: A charged particle is free to move in an electric field. It will travel
(a) always along a line of force
(b) along a line of force, if its initial velocity is zero
(c) along a line of force, if it has some initial velocity in the direction of an acute angle with the line of force
(d) none of the above
Answer: B
Question: If a linear isotropic dielectric is placed in an electric field of strength E, then the polarization P is
(a) independent of E
(b) inversely proportional to E
(c) directly proportional to E
(d) directly proportional to E
Answer: D
Question: A point charge is kept at the centre of metallic insulated spherical shell. Then
(a) electric field out side the sphere is zero
(b) electric field inside the sphere is zero
(c) net induced charge on the sphere is zero
(d) electric potential inside the sphere is zero
Answer: C
Question: If one penetrates a uniformly charged spherical cloud, electric field strength
(a) decreases directly as the distance from the centre
(b) increases directly as the distance from the centre
(c) remains constant
(d) None of these
Answer: A
Question: Electric lines of force about a negative point charge are
(a) circular anticlockwise
(b) circular clockwise
(c) radial, inwards
(d) radial, outwards
Answer: C
Question: Electric lines of force
(a) exist everywhere
(b) exist only in the immediate vicinity of electric charges
(c) exist only when both positive and negative charges are near one another
(d) are imaginary
Answer: D
Question: Positive electric flux indicates that electric lines of force are directed
(a) outwards
(b) inwards
(c) either (a) or
(b) (d) None of these
Answer: A
Question: The S.I. unit of electric flux is
(a) weber
(b) newton per coulomb
(c) volt × metre
(d) joule per coulomb
Answer: C
Question: If the flux of the electric field through a closed surface is zero, then
(a) the electric field must be zero everywhere on the surface
(b) the electric field may not be zero everywhere on the surface
(c) the charge inside the surface must be zero
(d) the charge in the vicinity of the surface must be zero
Answer: C
Question: Electric flux over a surface in an electric field may be
(a) positive
(b) negative
(c) zero
(d) All of the above
Answer: D
Question: The electric field inside a spherical shell of uniform surface charge density is
(a) zero
(b) constant different from zero
(c) proportional to the distance from the curve
(d) None of the above
Answer: A
Question: For distance far away from centre of dipole the change in magnitude of electric field with change in distance from the centre of dipole is
(a) zero.
(b) same in equatorial plane as well as axis of dipole.
(c) more in case of equatorial plane of dipole as compared to axis of dipole.
(d) more in case of axis of dipole as compared to equatorial plane
Answer: D
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
Question: An electric dipole is kept in a non-uniform electric field. It experiences
(a) a force and a torque
(b) a force but not a torque
(c) a torque but no force
(d) neither a force nor a torque
Answer: A
Question: The formation of a dipole is due to two equal and dissimilar point charges placed at a
(a) short distance
(b) long distance
(c) above each other
(d) none of these
Answer: A
Question: A hollow sphere of charge does not have electric field at
(a) outer point
(b) interior point
(c) beyond 2 m
(d) beyond 100 m
Answer: B
Question: Charge motion within the Gaussian surface gives changing physical quantity
(a) electric field
(b) electric flux
(c) charge
(d) gaussian surface area
Answer: A
Question: Gauss’s law is true only if force due to a charge varies as
(a) r–1
(b) r–2
(c) r–3
(d) r–4
Answer: B
Question: An electric dipole is placed at an angle of 30° to a non-uniform electric field. The dipole will experience
(a) a translational force only in the direction of the field
(b) a translational force only in the direction normal to the direction of the field
(c) a torque as well as a translational force
(d) a torque only
Answer: C
Question: An electric dipole is placed at the centre of a sphere then
(a) the flux of the electric field through the sphere is not zero.
(b) the electric field is zero at every point of the sphere.
(c) the electric field is not zero anywhere on the sphere.
(d) the electric field is zero on a circle on the sphere.
Answer: A
Question: Gauss's law is valid for
(a) any closed surface
(b) only regular close surfaces
(c) any open surface
(d) only irregular open surfaces
Answer: A
Question: An electric dipole has a pair of equal and opposite point charges q and –q separated by a distance 2x. The axis of the dipole is
(a) from positive charge to negative charge
(b) from negative charge to positive charge
(c) Perpendicular to the line joining the two charges rawn at the centre and pointing upward direction
(d) Perpendicular to the line joining the two charges drawn at the centre and pointing downward direction
Answer: B
Question: The Gaussian surface
(a) can pass through a continuous charge distribution.
(b) cannot pass through a continuous charge distribution.
(c) can pass through any system of discrete charges.
(d) can pass through a continuous charge distribution as well as any system of discrete charges.
Answer: B
Question: Assertion : On moving a distance two times the initial distance away from an infinitely long straight uniformly charged wire the electric field reduces to one third of the initial value.
Reason : The electric field is inversely proportional to the distance from an infinitely long straight uniformly charged wire.
(a) Assertion is correct, reason is correct; reason is a correct explanation for assertion.
(b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(c) Assertion is correct, reason is incorrect
(d) Assertion is incorrect, reason is correct.
Answer: A
