Saturday
1. Potassium nitrate is used in
A. medicine
B. fertiliser
C. salt
D. glass
Answer: Option B
2. Permanent hardness of water may be removed by the addition of
A. sodium carbonate
B. alum
C. potassium permanganate
D. lime
Answer: Option A
3. Soda water contains
A. carbonic acid
B. sulphuric acid
C. carbon dioxide
D. nitrous acid
Answer: Option C
4. The most important ore of aluminium is
A. galena
B. calamine
C. calcite
D. bauxite
Answer: Option D
5. Most soluble in water is
A. camphor
B. sulphur
C. common salt
D. sugar
Answer: Option D
6. Which of the following was to be discovered first in the chromospheres of the sun?
A. Krypton
B. Xenon
C. Neon
D. Helium
Answer: Option D
7. Which of the following is in liquid form at room temperature?
A. Lithium
B. Sodium
C. Francium
D. Cerium
Answer: Option C
8. Sodium metal is kept under
A. petrol
B. alcohol
C. water
D. kerosene
Answer: Option D
9. Which of the following are the ingredients of gun metal?
A. Iron, Zinc, Titanium
B. Iron, tin
C. Iron, Brass, Tin
D. Copper, Tin
Answer: Option D
10. From which mineral is radium obtained?
A. Rutile
B. Haematite
C. Limestone
D. Pitchblende
Answer: Option D
