Some General Science Questions and Answers for preparation of Tamil Nadu Public Service Commission (TNPSC) exam are as follows:

1.The chemical used as a fixer in photography is
Sodium thiosulphate
2. any one substances undergoes chemical change on heating ?
Lead Nitrate
3. The gas used to extinguish fire is
Carbon dioxide
4. The most malleable metal is
Pain Killer
5.A mixture of iron filings and sand can be separated by
Magnetic Separation
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6. Polythene is industrially prepared by the polymerization of
Ethylene
7. ------- metals can displace zinc from a solution of zinc sulphate ?
Magnetism
8.Glass is made from the mixture of
Sand and silicates
9.In which process, Vanadium Pentoxide is used as a catalyst ?
Contact process
10.---------- metals can displace hydrogen from dilute acids ?
Zinc
11. Epoxy resins is used as
Adhesives
12. The element present in the largest amount in rocks and minerals is
Silicon
13.------- is used in pencils?
Graphite
14.In which processes light energy is converted into chemical energy ?
Photosynthesis
15.LPG consists of mainly
methane, butane and propane

16. The most important ore of Aluminium is
Bauxite
17. ------ is the best conductor of Electricity ?
Sea water
18.--------- gases is obtained by the reaction of water with Calcium Carbide ?
Methane
19.A substance which changes readily into vapour without heating is called
Volatile
20.A mixture of water and alcohol can be separated by
Distillation
21.Combustion is the process in which
Heat and Light is produced
22. An alloy used in making heating elements for electric heating devices is
Nichrome
23.Antidiuretic hormone (ADH)
causes an increase in the blood pressure
24. Water gas is prepared by passing
Steam over white hot coke
25.PVC is obtained by the polymerisation of
Vinyl Chloride
26.Gobar gas contains mainly
Methane
27. Tetraethyl lead is used as
Petrol additive
28.Cooking oil can be converted into vegetables ghee by the process of
Hydrogenation
29. The charcoal used to decolourise raw sugar is
Wood charcoal
30.Balloons are filled with
Helium
31.The most abundant metal in the earth’s crust is
Aluminium
32.The gas liberated during the reaction of copper with dilute nitric acid is
NO
33. The element common to all acids is
Hydrogen
34. Which of the following is used in beauty parlours for hair setting ?
Chlorine
35. German Silver is an alloy of
Zinc, Copper and Nickel
36. Air is a/an
Mixture
37.The rate of chemical reaction does not depend on
Pressure
38.From which mineral is radium obtained
Pitchblende
39.Name any substances exhibit the property of sublimation ?
Camphor
40.Water is neither acidic nor alkaline because
it can dissociate into equal number of hydrogen ions