Chemistry Quiz for SSC CGL Exams (Set - 1)
1. Which one of the following chemicals helps in
fruit ripening?
(a) Ethephon
(b) Atrazine
(c) Isoproturan
(d) Malathion
2. Solder is an alloy of
(a) tin and lead
(b) tin and copper
(c) tin, copper and zinc
(d) tin, lead and zinc
3. CNG used in automobiles to check pollution,
mainly consists of
(a) CH4
(b) CO2
(c) N2
(d) H2
4. Pyrethrin used in mosquito coil is obtained
from
(a) a seed plant
(b) an insect
(c) a bacterium
(d) a fungus
5. Bio-gas mainly consists of
(a) carbon dioxide and hydrogen
(b) hydrogen and methane
(c) carbon dioxide and methane
(d) hydrogen and oxygen
6. ‘Acid rain’ is caused due to air-pollution by
(a) carbon dioxide
(b) carbon monoxide
(c) methane
(d) nitrous oxide and sulphur dioxide
7. Which of the following is the most common
element in the universe?
(a) Hydrogen
(b) Oxygen
(c) Nitrogen
(d) Carbon
8. A pungent smell often present near the urinals
is due to
(a) sulphur-di-oxide
(b) chlorine
(c) ammonia
(d) urea
9. Vinegar is an aqueous solution of
(a) oxalic acid
(b) citric acid
(c) hydrochloric acid
(d) acetic acid
10. Which of the following laser types is used in
a laser printer?
(a) Dye laser
(b) Semiconductor laser
(c) Excimer laser
(d) Gas laser
11. Which one of the following is used as a
moderator in the nuclear reactor ?
(a) Thorium
(b) Graphite
(c) Radium
(d) Ordinary water
12. Indane gas is a mixture of
(a) butane and hydrogen
(b) butane and oxygen
(c) butane and propane
(d) methane and oxygen
13. The important metal used with iron to produce
stainless steel is
(a) carbon
(b) tin
(c) chromium
(d) aluminium
14. The gas which emits from rice field is
(a) ethane
(b) methane
(c) nitrogen
(d) All of the above
15. The nuclear fuel in the sun is
(a) helium
(b) hydrogen
(c) uranium
(d) alpha particles
16. Which one of the following elements is used in
the manufacture of safety matches?
(a) Graphite
(b) Phosphorus
(c) Silicon
(d) Sodium
17. Minerals are
(a) liquids
(b) inorganic solid
(c) gases
(d) all of the above
18. The halogen being used as analgesic is
(a) chlorine
(b) bromine
(c) iodine
(d) fluorine
19. The first metal used by man was
(a) gold
(b) silver
(c) copper
(d) iron
20. The end product of alcoholic fermentation is
(a) pyruvic acid
(b) acetaldehyde
(c) ethyl alcohol
(d) formic acid
Answers with Explanations:
1. (a) Ethephon is used to promote
pre-harvest ripening of fruits e.g., tomatoes, sugar beet, fodder beet, coffee
and many other products.
2. (a) Solders
are typically made from tin or lead or a combination of both in the ratio of
63:377 respectively.
3. (a) Natural
gas is 95 percent Methane (CH4) Plus four other hydrocarbons:
Ethane (C2H6) – 2.5%,
Propane (C3H8) – 0.2%, Butane (C4H10) – 0.06%, Pentanes Plus (C5H12 + C10H22) –
0.02%.It also contains small amounts of: Nitrogen (N2) – 1.6%, Carbon Dioxide
(CO2) – 0.7%, Hydrogen Sulphide (H2S) – trace, Water (H2O) – trace
4. (a)
Pyrethrin is a natural plant derived substance that comes from the
chrysanthemum cinerariaefolium.
5. (c)
Bio gas is primarily a mixture of methane (CH4) and inert carbon dioxide gas
(CO2). However the name ‘biogas’ gathers a large variety of gases resulting
from specific treatment processes, starting from various organic waste -
industries, animal or domestic origin waste, etc.
6. (d)
Acid rain is caused by emissions of sulphur dioxide and nitrogen oxide, which
react with the water molecules in the atmosphere to produce acids.
7. (a)
The most abundant element in the universe is hydrogen, which makes up about 3/4
of all matter! Helium makes up most of the remaining 25%. Oxygen is the third
most abundant element in the universe. All of the other elements are relatively
rare.
8. (c) A
pungent smell often present near the urinals is due to ammonia.
9. (d) Vinegar is a
liquid consisting mainly of acetic acid (CH3COOH) and water.
10. (d)
Gas laser is used in a laser printer.
11. (b)
Graphite, a form of carbon slows down neutrons hence its name a moderator.
12. (c)
Indane gas is a mixture of butane and propane.
13. (c)
Stainless steel contain sufficient chromium to form a passive film of chromium
oxide, which prevents further surface corrosion by blocking oxygen diffusion to
the steel surface and blocks corrosion from spreading into the metal’s internal
structure.
14. (b)
Rice agriculture is a big source of atmospheric methane, possibly the biggest
of man-made methane sources.
15. (a) Helium
is the nuclear fuel in the sun.
16. (b)
The coated end of a match, known as the match “head”, contains either
phosphorus or phosphorus sesquisulfide as the active ingredient and gelatin as
a binder.
17. (b) Minerals
are inorganic solid.
18. (b) Compounds
of bromine have been used as sedatives, hypnotics, and analgesics.
19. (c)
Probably copper which can be found as a naturally occurring native metal which
is sometimes found in large lumps on the ground. People learned to make this
into copper tools and other things, although, for a metal, it is quite soft.
When it was melted over fire, people learned how to make an alloy called
bronze, which is much harder and stronger than copper.
20. (c)
Alcoholic fermentation, is a biological process in which sugars such as
glucose, fructose, and sucrose are converted into cellular energy and thereby
produce ethanol and carbon dioxide as metabolic waste products.
