GENERAL SCIENCE

1.  Brass gets discoloured in air because of the presence of which of the following

A. Oxygen

B. Hydrogen sulphide

C. Carbon dioxide

D. Nitrogen

2.  Which of the following is a non metal that remains liquid at room temperature?

A. Phosphorous B. Bromine

C. Chlorine D. Helium

3.  Chlorophyll is a naturally occurring chelate compound in which central metal is

A. copper B. magnesium

C. iron D. calcium

4.  Which of the following is used in pencils?

A. Graphite B. Silicon

C. Charcoal D. Phosphorous

5.  Which of the following metals forms an amalgam with other metals?

A. Tin B. Mercury

C. Lead D. Zinc

.
6.  Chemical formula for water is

A. NaAlO2 B. H2O

C. Al2O3 D. CaSiO3

7.  The gas usually filled in the electric bulb is

A. nitrogen

B. hydrogen
 C. carbon dioxide

D. oxygen

8.  Washing soda is the common name for

A. Sodium carbonate

B. Calcium bicarbonate

C. Sodium bicarbonate

D. Calcium carbonate

9.  Quartz crystals normally used in quartz clocks etc. is chemically

A. silicon dioxide

B. germanium oxide

C. a mixture of germanium oxide and silicon dioxide

D. sodium silicate

10.  Which of the gas is not known as green house gas?

A. Methane

B. Nitrous oxide

C. Carbon dioxide

D. Hydrogen

11.  Bromine is a

A. black solid

B. red liquid

C. colourless gas

D. highly inflammable gas

12.  The hardest substance available on earth is

A. Gold B. Iron

C. Diamond D. Platinum
13.  The variety of coal in which the deposit contains recognisable traces of
the original plant material is

A. bitumen B. anthracite

C. lignite D. peat

14.  Tetraethyl lead is used as

A. pain killer

B. fire extinguisher

C. mosquito repellent

D. petrol additive

15.  Which of the following is used as a lubricant?

A. Graphite

B. Silica

C. Iron Oxide

D. Diamond

16.  The inert gas which is substituted for nitrogen in the air used by deep
sea divers for breathing, is

A. Argon B. Xenon

C. Helium D. Krypton

17.  The gases used in different types of welding would include

A. oxygen and hydrogen

B. oxygen, hydrogen, acetylene and nitrogen

C. oxygen, acetylene and argon

D. oxygen and acetylene

18.  The property of a substance to absorb moisture from the air on

exposure is called

A. osmosis B. deliquescence
 C. efflorescence D. desiccation

19.  In which of the following activities silicon carbide is used?

A. Making cement and glass

B. Disinfecting water of ponds

C. cutting very hard substances

D. Making casts for statues

20.  The average salinity of sea water is

A. 3% B. 3.5%

C. 2.5% D. 2%

21. When an iron nail gets rusted, iron oxide is

formed
without any change in the weight of the
A.
nail

B. with decrease in the weight of the nail

C. with increase in the weight of the nail

without any change in colour or weight of

D.
the nail

22. Galvanised iron sheets have a coating of

A. lead B. chromium

C. zinc D. tin

23. Among the various allotropes of carbon,

A. coke is the hardest, graphite is the softest

B. diamond is the hardest, coke is the softest

C. diamond is the hardest, graphite is the softest

D. diamond is the hardest, lamp black is the softest

24. The group of metals Fe, Co, Ni may best called as

A. transition metals

B. main group metals

 C. alkali metals

D. rare metals

25. Heavy water is
A. deuterium oxide

B. PH7

C. rain water

D. tritium oxide
26.  The chemical (ethyl mercaptan) added to the otherwise odourless LPG
cooking gas for imparting a detectable smell to the gas is a compound
of

A. bromine B. fluorine

C. chlorine D. sulphur

27.  The element common to all acids is

A. hydrogen B. carbon

C. sulphur D. oxygen

28.  Non stick cooking utensils are coated with

A. Teflon

B. PVC

C. black paint

D. polystyrene

29.  Monazite is an ore of

A. titanium B. zirconium

C. iron D. thorium

30.  Carbon, diamond and graphite are together called

A. allotropes B. isomers

C. isomorphs D. isotopes

31.  Potassium nitrate is used in

 A. medicine B. fertiliser

C. salt D. glass

32.  Permanent hardness of water may be removed by the addition of

A. sodium carbonate

B. alum

C. potassium permanganate

D. lime

33.  Soda water contains

A. carbonic acid

B. sulphuric acid

C. carbon dioxide

D. nitrous acid

34.  The most important ore of aluminium is

A. galena B. calamine

C. calcite D. bauxite

35.  Most soluble in water is

A. camphor

B. sulphur

C. common salt

D. sugar

36. Which of the following was to be discovered first in

the chromospheres of the sun?
A. Krypton B. Xenon

C. Neon D. Helium

37. Which of the following is in liquid form at room temperature?

A. Lithium B. Sodium
 C. Francium D. Cerium

38. Sodium metal is kept under

A. petrol B. alcohol

C. water D. kerosene

39. Which of the following are the ingredients of gun metal?

A. Iron, Zinc, Titanium

B. Iron, tin

C. Iron, Brass, Tin

D. Copper, Tin

40. From which mineral is radium obtained?

A. Rutile B. Haematite

C. Limestone D. Pitchblende
41.  What is laughing gas?

A. Nitrous Oxide

B. Carbon monoxide

C. Sulphur dioxide

D. Hydrogen peroxide

42.  Actinides are the elements with atomic numbers from

A. 97 to 104

B. 101 to 115

C. 89 to 103

D. 36 from 43

43.  The two elements that are frequently used for making transistors are

A. boron and aluminium

B. silicon and germanium

C. iridium and tungsten

 D. niobium and columbium

44.  The filament of an electric bulb is made of

A. tungsten B. nichrome

C. graphite D. iron

45.  Diamond is an allotropic form of

A. germanium B. carbon

C. silicon D. sulphur

46. In fireworks, the green flame is produced

because of
A. sodium B. barium

C. mercury D. potassium

47. Permanent hardness of water can be removed by adding

A. chlorine

B. washing soda

C. potassium permanganate

D. bleaching powder

48. Marsh gas is
A. nitrogen B. ethane

C. methane D. hydrogen

49. LPG consists of mainly

A. methane, ethane and hexane

B. ethane, hexane and nonane

C. methane, hexane and nonane

D. methane, butane and propane

50. Air is a/an
A. compound B. element

C. electrolyte D. mixture
51.  Production of chlorofluorocarbons (CFC) gas which is proposed to be
banned in India, is used in which of the following domestic products?
 A. Television

B. Refrigerator

C. Tube light

D. Cooking gas

52.  Balloons are filled with

A. nitrogen B. helium

C. oxygen D. argon

53.  Which of the following does not contain a coinage metal?

A. Silver and Gold

B. Zinc and Gold

C. Copper and Silver

D. Copper and Gold

54.  Which metal pollute the air of a big city?

A. Copper B. Chromium

C. Lead D. Cadmium

55.  Bell metal is an alloy of

A. nickel and copper

B. zinc and copper

C. brass and nickel

D. tin and copper

56.  Water is a good solvent of ionic salts because

A. it has a high specific heat

B. it has no colour

C. it has a high dipole moment

D. it has a high boiling point

57.  Which of the following is not an isotope of hydrogen?

A. Tritium B. Deuterium

C. Protium D. Yttrium

58.  The main constituents of pearls are

A. calcium oxide and ammonium chloride

B. calcium carbonate and magnesium carbonate

C. aragonite and conchiolin

D. ammonium sulphate and sodium carbonate

59.  Amalgams are

A. highly coloured alloys

B. alloys which contain mercury as one of the contents

C. alloys which have great resistance to abrasion

D. alloys which contain carbon

60.  Which of the following is the lightest metal?

A. Mercury B. Lithium

C. Lead D. Silver

61.  Which of the following metals remain in liquid for under normal
conditions?

A. Radium B. Zinc

C. Uranium D. Mercury

62.  Potassium Permanganate is used for purifying drinking water, because

A. it is a sterilising agent

B. it dissolves the impurities of water

C. it is a reducing agent

D. it is an oxidising agent
63.  Which of the following is an element?

A. Ruby B. Sapphire

C. Emerald D. Diamond

KEY TO CORRECTION
1.B
2.B
3.B
4.A
5.B
6.B
7.A
8.A
9.A
10.D
11.B
12.C
13.D
14.D
15.A
16.C
17.D
18.B
19.C
20.B
21.C
22.C
23.C
24.A
25.A
26.D
27.A
28.A
29.D
30.A
31.B
32.A
33.C
34.D
35.D
36.D
37.C
38.D
39.D
40.D
41.A
42.C
43.B
44.A
45.B
46.B
47.B
48.B
49.D
50.D
51.B
52.B
53.B
54.C
55.D
56.C
57.D
58.B.
59.B
60.B
61.D
62.D
63.D