1) What does airbag, used for safety of car driver, contain?
A. Sodium bicarbonate
B. Sodium azide
C. Sodium nitrite
D. Sodium peroxide
Answer : B.

2) The weight of an object will be minimum when it is placed at
A. The North Pole
B. The South Pole
C. The Equator
D. The center of the Earth
Answer : D.

3) The uranium fuel used worldwide is mainly in the form of
A. U3O8
B. UO2
C. UF6
D. U metal
Answer : B.

4) The time taken by the Sun to revolve around the center of our galaxy is
A. 50 mn years
B. 100 mn years
C. 250 mn years
D. 365 mn years
Answer : C.

5) Consider the following:
1. Photosynthesis
2. Respiration
3. Decay of organic matter
4. Volcanic action
Which of the above add carbon dioxide to the carbon cycle on Earth?
A. 1 and 4 only
B. 2 and 3 only
C. 2, 3 and 4 only
D. 1, 2, 3 and 4
Answer : C.

6) Chemically, lime water is
A. Calcium hydroxide
B. Sodium carbonate
C. Sodium hydroxide
D. Calcium carbonate
Answer : A.

7) Chlorination is a process used for water purification. The disinfecting action of chlorine is mainly due to
A. The formation of hydrochloric acid when chlorine is added to water.
B. The formation of hypochlorous acid when chlorine is added to water.
C. The formation of nascent oxygen when chlorine is added to water.
D. The formation of hydrogen when chlorine is added to water.
Answer : C.

8) Chemically, bleaching powder is
A. Calcium hypochlorite
B. Calcium hydroxide
C. Sodium hydroxide
D. Calcium sulphate
Answer : A.

9) Consider the following statements:
1. Biodiversity is normally greater in the lower latitudes as compared to the higher latitudes.
2. Along the mountain gradients, biodiversity is normally greater in the lower altitudes as compared to the higher altitudes.
Which of the statements given above is/are correct?

A. 1 only
B. 2 only
C. Both 1 and 2
D. Neither 1 nor 2
Answer : C.

10) Consider the following statements:
1. Hepatitis B is several times more infectious than HIV / AIDS.
2. Hepatitis B can cause liver cancer.
Which of the statement given above is/are correct?
A. 1 only
B. 2 only
C. Both 1 and 2
D. Neither 1 nor 2
Answer : C.