Biology:
1. A
In recombinant DNA technology, E.coli and yeast are widely used host for replication and amplification of recombinant DNA because of their fast reproduction rate and easy mutability
2. B
3. D
Interferons are not antibodies. These are protiens produced by the cells in response to foreign particles and they do not stimulate inflammation
4. A
5. C
Physics:
1. A
Specific gravity is former name of relative density and relative density is the ratio of density of substance to the density of water
2. D
Frictional work is not completely recoverable as total mechanical energy is not conserved. The frictional force is therefore called a non conservative or a dissipative force
3. C
When glass surface is made rough then the light falling on it is scattered in different directions due to which its transparency decreases
4. A
Adibatic expansion produces cooling
5. The process of nuclear fusion can be explained with the help of concept of binding energy per nucleon. Binding energy for Cl-35 is large,making it stable and thus, cant be used as fuel for fusion
Chemistry:
1. D
Ba(OH)2 is soluble in water
2. C
SeCl4 possess see saw geometry, which can be regarded as a distorted trigonal bipyramidal structure, having one lone pair of electron in the basal position. See-saw geometry arise due to sp3d hybridisation and distortion in shape is due to lone pair
3. A
Depression in freezing point is a colligative property which depends on the number of particles. The number of particles are different in case of benzene and water that is why molecular weight of acetic acid determined by depression in freezing point method is also different
4. A
In case of hydrogen, compressibility factor increases with the pressure. At 273K, Z>1 which shows that it is difficult to compress the gas as compared to ideal gas. In this case repulsive forces dominate
5. Hydrolysis of methyl chloride to methanol follows SN2 reaction. In contrast to protic solvents, which decrease the rate of SN2, polar aprotic solvents(DMF) increases the rate of SN2 reactions by raising the ground state energy of nucleophile
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