1. Which one of the following
materials is suitable for water purification?
(a)
Silicones
(b)
Zeolites
(c)
Asbestos
(d)
Quartz
2. Which are Rubles and Sapphires Chemically known as?
(a)
Silicon dioxide
(b)
Aluminium oxide
(c)
Lead tetraoxide
(d)
Boron nitrite
(a)
Soda glass
(b)
Pyrex glass
(c)
Jena glass
(d)
Reinforced glass
4. Talc contains which of the following?
(a)
Zinc, calcium and oxygen
(b)
Calcium, oxygen and tin
(c)
Magnesium, silicon and oxygen.
(d)
Zinc, tin and sulphur
5. Why hard water does not give lather with soap?
(a)
Hard water contains calcium and magnesium ions
which form perceptible with soap
(b)
Hard water contains sulphate and chloride ions
which form precipitate
(c)
pH of hard water is high
(d)
pH of hard water is less
6. Which one of the following is correct? Setting of plaster of Paris
is
(a)
dehydration
(b)
oxidation with atmospheric oxygen
(c)
hydration leading to another hydrate
(d)
combination with atmospheric
7.
In which one of the following situations a chemical reaction does not occur?
(a)
Common salt is exposed to air
(b)
Coal is burnt in air
(c)
Sodium is placed in water
(d)
Iron is kept in moist air
8. Which
of the following gases in the atmosphere is / are responsible for acid rains?
1.
Oxides of sulphur
2.
Oxides of nitrogen
3.
Oxides of carbon
Select the correct answer using the codes
given below
(a)
1 and 2
(b)
1 and 3
(c)
Only 2
(d)
All of these
9. Which
chemical was an important symbol in our struggle for freedom?
(a)
Glucose
(b)
Fertilizer
(c)
Medicine
(d)
Sodium chloride
10.
Which of the following is used as moderators in nuclear reactors?
(a)
Graphite
(b)
Paraffin
(c)
Heavy water
(d)
All of these
Answer:
1.
b
2.
b
3.
d
4.
c
5.
a
6.
c
7.
a
8.
a
9.
d
10.
d
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