# Question

## The work done in carrying a charge ‘Q’ once round a circle of radius ‘r’ with charge ‘q’ at the centre of circle is

Question. The work done in carrying a charge ‘Q’ once round a circle of radius ‘r’ with charge ‘q’ at the centre of circle is a) Q/4πε0r b) Qq/4πε0r c) Zero d) θq/2r Answer: c) Zero

## In a uniform external field E = (2i+3j-4k)V/m, the value of electric flux passing through a surface having area A = 8jm2 placed in this field

Question. In a uniform external field E = (2i+3j-4k)V/m, the value of electric flux passing through a surface having area A = 8jm2 placed in this field a) 24Vm b) 16 Vm c) 32 Vm d) 0 Vm Answer: a) 24Vm

## Work done in rotating an electric dipole of dipole moment p (in presence of external uniform electric field ‘E’) from stable equilibrium to unstable equilibrium is

Question. Work done in rotating an electric dipole of dipole moment p (in presence of external uniform electric field ‘E’) from stable equilibrium to unstable equilibrium is a) -2pE b) 2pE c) pE/2 d) pE Answer: b) 2pE

## The surface densities on the surfaces of two charged spherical conductors of radii R1 and R2 are equal. The ratio of electric intensities on their surfaces is

Question. The surface densities on the surfaces of two charged spherical conductors of radii R1 and R2 are equal. The ratio of electric intensities on their surfaces is: a) R12 / R22 b) R22 / R12 c) R1 / R2 d) 1 : 1 Answer: d) 1 : 1 Let the surface densities on the …

## Three charged particles are collinear and are in equilibrium, then

Question. Three charged particles are collinear and are in equilibrium, then a) all the charged particles have the same polarityb) the equilibrium in unstablec) all the charged particles cannot have the same polarityd) both (a) and (c ) are correct Answer: d) both (a) and (c ) are correct If a charged particle is in …

## Arrange the following compounds in increasing order of their boiling points

Question. Arrange the following compounds in increasing order of their boiling points. i)(CH3)2CHCH2Brii)CH3CH2CH2CH2Briii)(CH3)3CBr a) (ii)<(i)<(iii)b) (i)<(ii)<(iii)c) (iii)<(i)<(ii)d) (iii)<(ii)<(i) Answer: c) (iii)<(i)<(ii)

## which reagent is used for the following reaction?

Question. Which reagent will you use for the following reaction?CH3​CH2​CH2​CH3​→CH3​CH2​CH2​CH2​Cl+CH3​CH2​CH(Cl)CH3 ​a)Cl2/UV lightb)NaCl+H2SO4c)Cl2 gas in darkd)Cl2 gas in the presence of iron in dark Answer: ​a)Cl2/UV light

## At equilibrium the rate of dissolution of a solid solute in a volatile liquid solvent is:

Question. At equilibrium the rate of dissolution of a solid solute in a volatile liquid solvent is:(i) less than the rate of crystallisation(ii) greater than the rate of crystallisation(iii) equal to the rate of crystallisation(iv) zero Answer: (iii) equal to the rate of crystallisation

## The total number of tetrahedral voids in the face centred unit cell is

Question. The total number of tetrahedral voids in the face centred unit cell is________. a) 6 b) 8 c) 10 d) 12 Answer: b) 8

## During parturition, a pregnant woman is having prolonged labour pains and child birth has to be fastened. It is advisable to administer a hormone that can

Question. During parturition, a pregnant woman is having prolonged labour pains and child birth has to be fastened. It is advisable to administer a hormone that canA. increase the metabolic rate.B. release glucose in the blood.C. stimulate the ovary.D. activate smooth muscles. Answer: D. activate smooth muscles.

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