*General Science Questions and Answers*

1. The element common to all acids is–

(A) Oxygen
(B) Hydrogen ✔
(C) Nitrogen
(D) Sulphur

2. Gobar gas contains mainly–

(A) Methane ✔
(B) Carbon dioxide
(C) Butane
(D) Carbon Monoxide

3. The most malleable metal is–

(A) Silver
(B) Gold ✔
(C) Aluminium
(D) Sodium

4. Which of the following is used in making smoke bombs ?

(A) Sulphur
(B) Phosphorus ✔
(C) Hydrogen
(D) Carbon

5. Caustic Soda is–

(A) Nacl
(B) Na2CO 3
(C) NaOH ✔
(D) NaHCO3

6. Chemical formula of Water glass is–

(A) Na 2SiO 3 ✔
(B) Al 2O 3
(C) NaAlO 2
(D) CaSiO 3

7. The hardest substance available in earth is–

(A) Platinum
(B) Silicon
(C) Diamond ✔
(D) Gold

8. Which of the following is the best conductor of electricity ?

(A) Zinc
(B) Copper
(C) Gold
(D) Silver ✔

9. The ratio of pure gold in 18 carat gold is–

(A) 60%
(B) 75% ✔
(C) 80%
(D) 100%

10. Which radioactive pollutant has recently drawn the attention of the public due to its occurance in the building materials ?

(A) Radium
(B) Radon
(C) Thorium ✔
(D) Plutonium

11. In an atomic explosion enormous energy is released which is due to the–

(A) Conversions of neutrons into protons

(B) Conversion of chemical energy into nuclear energy

(C) Conversion of mechanical energy into nuclear energy

(D) Conversion of mass into energy ✔

12. Which of the following is used as a coolant in nuclear reactors ?

(A) Heavy water
(B) Cadmium
(C) Liquid sodium ✔
(D) Graphite

13. In vulcanization, natural rubber is heated with–

(A) Carbon
(B) Sulphur ✔
(C) Silicon
(D) Phosphorus

14. Which type of fire extinguisher is used for petroleum fire ?

(A) Foam type
(B) Soda acid type
(C) Powder type ✔
(D) None of these

15. Which is/ are the important raw materials in cement industry ?

(A) Limestone
(B) Gypsum and Clay
(C) Clay
(D) Limestone and Clay ✔

16. A mixture of iron filings and sand can be separated by–

(A) Heating
(B) Sublimation
(C) Hand picking
(D) Magnetic Separation ✔

17. In which of the following process, Vanadium Pentoxide is used as a catalyst ?

(A) Contact process ✔
(B) Haber process
(C) Solvary process
(D) None of these

18. The rate of chemical reaction does not depend on–

(A) Concentration
(B) Catalyst
(C) Temperature
(D) Pressure ✔

19. The vitamin which can be synthesized in the gut by bacterial action is–

(A) vitamin B 1
(B) vitmain B 2
(C) vitmain B 12
(D) All above ✔

20. Deficiency of vitamin D causes–

(A) rickets ✔
(B) beri-beri
(C) scurvy
(D) night blindness

21. Which one of the following is the best source of vitamin A?

(A) Apple
(B) Carrot ✔
(C) Amla
(D) Raddish

22. Which of the following is not a chemical reaction ?

(A) Burning of paper
(B) Digestion of food
(C) Conversion of water into
steam ✔
(D) Burning of coal

23. Which of the following is a chemical change ?

(A) Rusting of iron ✔
(B) Tempering of iron
(C) Melting of iron
(D) Bending of iron

24. Photoelectric effect was discovered by–

(A) Einstein ✔
(B) Hertz
(C) Bohr
(D) Plank

25. The hydrogenation of the vegetables oils takes place in the presence of finely divided–

(A) aluminium
(B) charcoal
(C) silica
(D) nickel ✔