Question

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 […]

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

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)

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

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

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

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.

Question. In a fertilized ovule, n, 2n and 3n conditions occur respectively inA. antipodal, zygote and endospermB. zygote, nucellus and endospermC. endosperm, nucellus and zygote.D. antipodals, synergids and integusments Answer: A. antipodal, zygote and endosperm

Question. Short stretches of DNA used to identify complementary sequence in a sample are calledA. probesB. markersC. VNTRsD. primers Answer: A. probes

Question. Oswald Avery, Colin MacLeod and Maclyn McCarty used enzymes to purify biochemicals such as proteins, DNA and RNA from the heat-killed S cells to see which ones could transform live R cells into S cells in Griffith’s experiment. They observed thatA. Proteases and RNases affected transformation.B. DNase inhibited transformation.C. Proteases and Lipases affected transformation.D.