41) The heat required to raise the temperature of body by 1 K is called
a) specific heat
b) thermal capacity
c) water equivalent
d) None of the above
42) Heavy metal pollution of water is caused by :
a) Acid Plants
b) Paints
c) Wood Burning
d) Domestic Sewage
43) Phosphorus is mainly extracted from
a) Sand
b) Ash
c) Bone ash
d) Fertiliser
44) The metal that is used as a catalyst in the hydrogenation of oils is
a) Ni
b) Pb
c) Cu
d) Pt
45) The graphite rods in the nuclear reactor
a) react with U to release energy
b) produce neutrons
c) undergo combustion which triggers the nuclear fission
d) convert fast moving neutrons into thermal neutrons
46) The maximum number of covalent formed by nitrogen is
a)1
b)2
c)3
d)4
47) The organic reaction represented by equation CH3 – CH = O + H2NOH gives CH3 – CH – NH + H2O is an example of
a) an addition reaction
b) a condensation reaction
c) an oxidation reaction
d) an elimination reaction
48) The term PVC used in the plastic industry stands for
a)polyvinyl chloride
b)polyvinyl carbobate
c)phosphor vanadiu chloride
d)phosphavinyl chloride
49) Washing soda is ?
a)sodium sulphite
b)sodium bicarbonate
c)sodiun carbonate
d)sodium biosulphite
50) The most abundant element in the earth’s crust is ?
a)Aluminium
b)Nitrogen
c)Silicon
d)Oxygen