41) The most malleable metal is
a)platinum
b)silver
c)gold
d)iron
42) Supersonic Aircrafts discharge the following substance into the statosphere:
a) SO<sub>2</sub>
b) CO<sub>2</sub>
c) NO<sub>2</sub>
d) CO
43) Atmosphere contains dust particles, salt grains, pollen grains, smoke, etc. which are collecctively known as :
a) Water vapour
b) Ozone
c) Aerosols
d) CFC
44) What nucleus of atom contains ?
a)protons
b)electrons
c)electrons and protons
d)protons and neutrons
45) The most electronegative element among the following is
a)sodium
b)bromine
c)fluorine
d)oxygen
46) Homo nuclear molecules contain ?
a)polar bond
b)covalent bond
c)ionic bond
d)coordinate bond
47) An essential condition for rusting is
a) light
b) dry air
c) high temperature
d) moisture
48) Burglar proof safes are made of
a) Nickel steel
b) Chromium Steel
c) Manganese steel
d) Tungsten steel
49) The number of protons and neutrons respectively in the nucleus of tritium are
a) 2 and 2
b) 2 and 1
c) 1 and 2
d) 1 and 1
50) Pick the odd man out
a) Gun Power
b) Common salt
c) sugar solution
d) air
All The best!