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Quiz 8
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Q.1
When quick lime is added to water
Heat is liberated
Heat is absorbed
Temperature decreases
No heat change takes place
Q.2
A balloon filled with helium rises in air because
Air exerts an upward force on the balloon
The balloon is weightless
Helium is less dense than air
Helium pushes down on the air below the balloon
Q.3
Which one is a naturally occuring noble gas?
Sodium
Potassium
Argon
Boron
Q.4
Total number of naturally occurring elements
62
92
98
110
Q.5
Hydrogen is not found in atmosphere because
It is highly inflammable
It is the lightest gas
It is absorbed by plants
It immediately combines with oxygen to form water
Q.6
What is the element required for solar energy conversion ?
Beryllium
Tantalum
Silicon
Ultra pure carbon
Q.7
Water is not effective in extinguishing a fire caused by petrol because
The flame is too hot for water to cool it down
Water and petrol react chemically
Water and petrol are miscible with each other
Water and petrol are immiscible with each other and petrol which forms the upper layer continues to burn
Q.8
The temperature of oxy-acetylene flame is around
2800°C
3200°C
3600°C
4000°C
Q.9
Rock salt is a mineral containing
Potassium
Magnesium
Sodium
Iron
Q.10
Piped Natural Gas (PNG) is used for
Mining
Welding
Anaesthesia
Cooking
Q.11
Petroleum consists of a mixture of
Carbohydrates
Carbonates
Hydrocarbons
Carbides
Q.12
The components of water can be separated by
Physical methods
Chemical methods
Both A and B
They can not be separated
Q.13
Which one is a soluble salt in H
2
O?
CuS
Zn(OH)
2
CaCl
2
PbCl
2
Q.14
Chemical name of common salt is
Sodium Chloride
Sodium Bicarbonate
Sodium
Sodium Oxide
Q.15
The quality of petrol is expressed in terms of
Cetane number
Gold number
Octane number
Added unlead compounds
Q.16
The gas that usually causes explosions in coal mines is
Hydrogen
Carbon monoxide
Air
Methane
Q.17
Thermal electricity is generated by using which of these ?
Coal only
Coal and Natural Gas only
Coal, Natural Gas and Petroleum
None of these
Q.18
The charcoal used to decolourise brown sugar solution is
Wood charcoal
Coconut charcoal
Animal charcoal
Sugar charcoal
Q.19
The major component in the LPG is
Methane
Butane
Ethane
Propane
Q.20
The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing is:
Neon
Argon
Krypton
Helium
Q.21
The chemical formula of the laughing gas is
NO
N
2
O
NO
2
N
2
O
3
Q.22
The common name for the compound having formal NaOH is
Caustic soda
Caustic potash
Soda ash
Sodium hydroxide
Q.23
What is the element that is in the highest percentage in the composition of the earth ?
Silicon
Oxygen
Magnesium
Iron
Q.24
Which one of the following is also known as solution ?
A compound
A homogeneous mixture
A heterogeneous mixture
A suspension
Q.25
The coloured discharge tubes for advertisement mainly contain
Xenon
Argon
Helium
Neon
Q.26
Helium gas is used in gas balloons instead of hydrogen gas because it is
Lighter than hydrogen
More abundant than hydrogen
Non-combustible
More stable
Q.27
Baking soda is :
Potassium carbonate
Sodium hydroxide
Sodium carbonate
Sodium bicarbonate
Q.28
Sodium Carbonate is commonly known as
Baking Soda
Washing Soda
Caustic Soda
Caustic Potash
Q.29
Brine refers to :
Salt water
Sweet water
Pure water
Starch water
Q.30
White coal is
Uranium
Hydro-electricity
Diamond
None of these
Q.31
Which of the following is not a chemical reaction?
Burning of paper
Digestion of food
Conversion of water into steam
Burning of coal
Q.32
Chemical formula of washing soda is
Na
2
SO
4
.10H
2
O
NaHCO
3
Na
2
CO
3
.10H
2
O
Ca(OH)
2
Q.33
Vinegar is ________ .
Diluted acetic acid
Glacial acetic acid
Glacial formic acid
Diluted formic acid
Q.34
pH value between 6.5-7.5 makes the soil
Basic
Neutral
Acidic
None of these
Q.35
Nitrogen forms a variety of compounds in all oxidation states ranging from
–3 to +5
–3 to +3
–3 to +4
–3 to +6
Q.36
What is the covalency of nitrogen in ammonia molecule
2
3
4
5
Q.37
Which of the following type of coal has the lowest proportion of volatile matter ?
Lignite
Peat
Bituminous
Anthracite
Q.38
Sour taste of lemon is due to the presence of which of the following ?
Citric acid
Acetic acid
Oxalic acid
Formic acid
Q.39
pH scale ranges from
0 – 7
8 – 14
0 – 14
None
Q.40
Which of these acids is not organic in origin?
Lactic acid
Sulphuric acid
Citric acid
Oxalic acid
Q.41
Match the sourc in Column B with the product of
Column A. (Product)
Column B (Source)
A. Formic acid
1. Lemon
B. Citric acid
2. Tamarind
C. Tartaric acid
3. Ants
A B C
3 2 1
A B C
3 1 2
A B C
2 3 1
A B C
2 1 3
Q.42
A fertile soil is likely to have a pH of
3
9
6-7
14
Q.43
Submarines move under water. They have engines that run on
Petrol and oxygen
Diesel
Batteries
Steam
Q.44
Which is the highest quality of hard coal?
Anthracite
Bituminous
Lignite
Peat
Q.45
In which of the following states maximum iron ore is found ?
FeCO
3
Fe
2
O
3
Fe
3
O
4
FeS
2
Q.46
Which of the following is the major constituent of LPG?
Methane
Ethane
Propane
Butane
Q.47
Which variety of coal contains recognisable traces of the original plant material ?
Anthracite
Lignite
Peat
Bitumen
Q.48
Domestic cooking gas consists mostly of
Methane and ethane
Liquified butane and isobutane
Hydrogen and acetylene
Ethylene and carbon monoxide
Q.49
Philosopher’s wool is chemically
Aluminium oxide
Magnesium oxide
Zinc oxide
Calcium oxide
Q.50
What is the atomic number of Oxygen?
5
8
12
22
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