a/r test 5

in each of the following questions, a statement of assertion is given and a corresponding statement of reason is given just below it. of the statements, mark the correct answer as

a) both A and R are true and R is the correct explanation of A
b) both A and R are true and R is not the correct explanation of A
c) A is true and R is false
d) both A and R are false

biology

1.
A: in recombinant DNA technology, human genes are often transferred to bacteria or yeast
R: both bacteria and yeast multiply rapidly

2.
A: suspended particulate matter is an important pollutant released by diesel vehicles
R: catalytic converter greatly reduce pollution caused by automobiles

3.
A: interferons are type of antibodies
R: they stimulate inflammation

4.
A: organ transplantation patients are given immunosupressive drugs
R: transplanted tissue has antigens which stimulates the specific immune response of the recipient

5.
A: persons suffering from haemophilia fail to produce blood clotting factor VIII
R: prothrombin producing platelets in such persons are found in very low concentration

physics:

1.
A: specific gravity of a fluid is a dimensionless quantity
R: it is the ratio of density of fluid to the density of water

2.
A: frictional forces are conservative
R: potential energy can be associated with frictional forces

3.
A: by roughening the surface of glass sheet its transparency can be reduced
R: glass sheet with rough surface absorbs more light

4.
A: air quickly leaking out of a balloon becomes cooler
R: the leaking air undergoes adiabatic expansion

5.
A: it is not possile to use Cl-35 as fuel for fusion
R: the binding energy of Cl-35 is very small

chemistry:

1.
A: addition of NH4OH to an aqueous solution of BaCl2 in the presence of NH4Cl(excess) precipitates Ba(OH)2
R: Ba(OH)2 is insoluble in water

2.
A: SeCl4 does not have tetrahedral structure
R: Se in SeCl4 has two lone pairs

3.
A: the molecular weight of acetic acid determined by depression in freezing point method in benzene and water is found to be different
R: water is polar and benzene is non polar

4.
A: compressibility factor for hydrogen varies with pressure with positive slopes at all pressures
R: even at low pressures, repulsive forces dominate hydrogen gas

5.
A: rate of hydrolysis of methyl chloride to methanol is higher in DMF than in water
R: hydrolysis of methyl chloride follows second order kinetics

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