General Knowledge Test 38

24.Which of the following is not a bleaching agent ?

Sulphur dioxide
Carbon dioxide
Sodium hypochlorite
Chlorine
ANSWER : : Carbon dioxide

25.Non stick cooking utensils are coated with

black paint
PVC
teflon
polystyrene
ANSWER : : teflon


26.Find the odd one :

Marble
Chalk
Limestone
Slaked lime
ANSWER : : Slaked lime

27.Arrange the following metals in the decreasing order of their relative abundance in earths crust after aluminium : 1. Calcium 2. Iron 3. Sodium 4. Magnesium

1, 4, 2, 3
1, 2, 4, 3
2, 1, 3, 4
2, 1, 4, 3
ANSWER : : 2, 1, 3, 4

28.A super conductor is characterised by

zero permeability
low permeability
high permeability
infinite permeability
ANSWER : ro permeabilityns: zero permeability

29.Which of the following is used in pencils ?

Charcoal
Silicon
Phosphorus
Graphite
30.The gas used to extivguish fire, is

neon
nitrogen
carbon dioxde
carbon monoxide
ANSWER : : carbon dioxde


31.Which of the following gases is lighter than air ?

Carbon dioxide
Oxygen
Ammonia
Chlorine
ANSWER : : Ammonia

32.Of the various forms of carbon, the one which is used for adsorption purpose, is

Diamond
Graphite
Coke
Wood charcoal
ANSWER : : Wood charcoal

33.Galvanised iron sheets have a coating of

tin
lead
zinc
chromium
ANSWER : : zinc

34.The metal used in storage batteries is

iron
copper
lead
tin
ANSWER : : lead

35.The chemical name for urea is

aneurin
chloroethene
carbamide
None of these
ANSWER : : carbamide




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

Bromine
Chlorine
Helium
Phosphorus
ANSWER : ominens: Bromine

37.In which of following activities silicon carbide is used ?

Making cement and glass
Dinsinfecting water of ponds
Making casts for statues
Cutting very hard substances
ANSWER : : Cutting very hard substances

38.Sodium metal is kept under

water
alcohol
petrol
kerosene
ANSWER : : kerosene

39.Most soluble in water is

camphor
sugar
sulphur
common salt
ANSWER : : sugar

40.Which of the following metals was first discovered by man ?

Bronze
Silver
Iron
Copper
ANSWER : : Copper



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

Lead
Tin
Zinc
Mercury
ANSWER : : Mercury

42.Diamond is an allotropic form of

silicon
caebon
sulphur
germanium
ANSWER : : caebon

43.The presence of which of the following salts in water causes corrosion in steam boilers ?

Sodium chloride
Magnesium chloride
Calcium bicarbonate
Potassium bicarbonate
44.Which of the following is not a neutral oxide ?

Carbon monoxide
Sulphur dioxide
Nitric oxide
Water
ANSWER : : Sulphur dioxide

45.The ratio of pure gold in 18 carat gold is

60%
75%
80%
100%
ANSWER : : 75%

46.Which of the following is the correct sequence of the following elements in increasing order of their relative densities ? 1. Mercury 2. Gold 3. Lead 4. Aluminium

3, 2, 1, 4
3, 1, 4, 2
4, 1, 3, 2
4, 3, 1, 2
ANSWER : : 4, 3, 1, 2

47.Carborundum is

Silicon dioxide
Silicon carbide
Silicon nitride
Silicon phosphide
ANSWER : : Silicon carbide

48.Balloons are filled with