Gen Science 10 Qsns-

1. Which one of the
following is not a
pesticide?
a) BHC
b) Malathion
c) Freon
d) DDT
2. Acid rain contains
high levels of
a) oxalic acid
b) acetic acid
c) sulphuric and nitric
acids
d) carbolic acid
3. Safety matches are
made using
a) carbon, sulphur and
paraffin
b) potassium chloride,
antimony sulphide and
glue
c) lead dioxide, carbon
and paraffin
d) silicon dioxide,
sulphur and paraffin
4. Bronze is an alloy of
a) copper and zinc
b) tin and zinc
c) copper and tin
d) iron and zinc
5. Which one of the
following elements is
alloyed with iron to
produce steel which
can resist high
temperatures and also
have high hardness and
abrasion resistance?
a) aluminium
b) chromium
c) nickel
d) tungsten
6. Name a chemical
compound used in
photography?
a) silver bromide
b) potassium nitrate
c) hydrogen peroxide
d) hydrogen sulphide
7. Which chemical
compound is used for
the etching of glass?
a) sodium bicarbonate
b) carbon monoxide
c) hydrofluoric acid
d) nitric acid
8. Smog is a common
pollutant in places
having a higher
concentration of
a) sulphur dioxide
b) ammonia
c) nitrogen
d) oxygen
9. Cooking gas is a
mixture of
a) carbon monoxide and
carbon dioxide
b) butane and propane
c) methane and
ethylene
d) carbon dioxide and
oxygen
10. Which one of the
following substances is
made up of only one
type of atoms?
a) water
b) milk
c) hydrogen
d) air
Answers
1. Freon
2. carbolic acid
3. potassium chloride,
antimony sulphide and
glue
4. copper and tin
5. chromium
6. silver bromide
7. hydrofluoric acid
8. sulphur dioxide
9. butane and propane
10. hydrogen