1.	The ratio of electric force between two electrons to the gravitational force between them is of the order ?
	10^39
	1
	10^42
	10^36
	Answer: 10^42 Explanation:
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2.	The conservation of electric charge implies that ?
	The number of charged particle in the universe is constant
	Charge can’t be created
	Charge can’t be destroyed
	All of these are correct
	Answer: All of these are correct Explanation: Charge Neither created nor destroyed and it remains constant in the universe hence all are correct
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3.	Three charges + 3q + q and Q are placed on a st. line with equal separation. In order to make the net force on q to be zero, the value of Q will be ?
	-3q
	-4q
	+3q
	+2q
	Answer: +3q Explanation: To calculate net force, we simply calculate the forces on +q due to +3q and Q separately and then add these forces together. In each case, the force exerted by one charge on another charge can be calculated from Coulomb’s law. : the value of Q will be +3q
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4.	Gauss’s law will be invalid if ?
	the velocity of light is not a universal constant.
	the inverse square law is not exactly true.
	there is magnetic monopoles.
	none of these.
	Answer: the inverse square law is not exactly true. Explanation: Gauss’s law is based on the inverse square dependence on distance contained in the Coulomb’s law Any violation of Gauss’s law will indicate departure from the inverse square law.
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5.	Electric field at a point varies as r° for ?
	a line charge of infinite length
	a point charge
	an electric dipole
	a plane infinite sheet of charge
	Answer: a plane infinite sheet of charge Explanation:
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6.	In general, metallic ropes are suspended on the carriers taking inflammable materials. The reason is ?
	to keep the body of the carrier in contact with the earth.
	to control the speed of the carrier.
	none of these.
	to keep the centre of gravity of the carrier nearer to the earth.
	Answer: to keep the body of the carrier in contact with the earth. Explanation: For providing a path to the charge induced on the surface of the carriers.
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7.	The SI units of electric dipole moment are ?
	C
	Cm
	Nm-1
	Cm-1
	Answer: Cm Explanation: The SI unit for electric dipole moment is the coulomb-meter (C?m)
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8.	The belt of a Vande Graaf generator gets charge by ?
	induction
	electrification
	corona discharge
	None of these
	Answer: corona discharge Explanation: The operating phenomenon inside Van de Graff generator is Corona Discharge. Corona discharge actually means glow. When electric field near a pointed conductor is very high, air molecules near the conductor gets ionised. The free electrons resulting from the ionisation of air molecules are accelerated and these accelerated electrons cause more ionisation of air molecules. When recombination of free electrons and ionised air molecules takes place, we observe a glow which is known as Corona Discharge.
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9.	On rubbing, when one body gets positively charged and other negatively charged, the electrons transferred from positively charged body to negatively charged body are ?
	yet to be established
	valence electrons only
	both valence electrons and electrons of inner shell
	electrons of inner shells
	Answer: valence electrons only Explanation: On rubbing, when one body gets positively charged and other negatively charged, the electrons transferred from positively charged body to negatively charged body are valence electrons only.
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10.	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 ?
	negative
	zero
	cannot say
	positive
	Answer: zero Explanation: Positively charged rod induces negative charge on the side of the sphere closer to the rod and an equal positive charge on the side away from the rod. When the rod is withdrawn, the negative charges move to neutralise the equal positive charge. The charge left is zero.
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