1.
If four balloons A, B C and D are filled with
hydrogen, oxygen, helium and nitrogen gases respectively and left in air, which
balloon reaches to the highest distance from the Earth?
(a)
Balloon A
(b)
Balloon B
(c)
Balloon C
(d)
Balloon D
2.
Which one among the following is a strong
smelling agent added to LPG cylinder to help in the detection of gas leakage?
(a)
Ethanol
(b)
Thioethanol
(c)
Methane
(d)
Chloroform
3.
Which one among the following is not a
greenhouse gas?
(a)
Methane
(b)
Ozone
(c)
Chlorofluorocarbon
(d)
Sulphur dioxide
4.
Which one among the following is the main
ingredient in cement?
(a)
Gypsum
(b)
Limestone
(c)
Clay
(d)
Ash
5.
Solutions in test tubes containing H₂ O and
aqueous NaOH can be differentiated with the help of
(a)
Red litmus
(b)
Blue litmus
(c)
Na₂ CO₃
(d)
HCI (aqueous)
6.
Which one among the following salts causes
hardness ot the water?
(a)
Calcium bicarbonate
(b)
Calcium carbonate
(c)
Sodium sulphate
(d)
Potassium chloride
7.
Which one among the following substances evolve
heat when dissolved in water?
(a)
Potassium nitrate
(b)
Sodium chloride
(c)
Glucose
(d)
Calcium oxide
8.
Among the following elements, which one is not
present in a pure cugar?
(a)
Carbon
(b)
Hydrogen
(c)
Nitrogen
(d)
Oxygen
9.
Human stomach produces acid ‘X’ which helps in
digestion of food. Acid ‘X’ is
(a)
Acetic acid
(b)
Methanoic acid
(c)
Hydrochloric acid
(d)
Citric acid
10.
Statement I Chlorine radicals CI initiate the
chain reaction for ozone depletion.
Statement II Gaseous hypochlorous acid and chlorine are photolysed by
sunlight
Codes
(a)
Both the statements are true and Statement II is
the correct explanation of Statement I
(b)
Both the statements are true, but statement II
is not the correct explanation of statement I
(c)
Statement I is true, but statement II is false
(d)
Statement I is false, but Statement II is true
Answer:
1.
A
2.
B
3.
B
4.
B
5.
A
6.
A
7.
D
8.
C
9.
C
10.
A
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