General Science Objective Questions

1. Which of the following is not an ore of Aluminium?
(A) Felsper
(B) Bauxite
(C) Cryolite
(D) Azurite

2. Most soluble in water is —
(A) Camphor
(B) Sugar
(C) Sulphur
(D) Common Salt

3. Bromine is —
(A) colourless gas insoluble in water
(B) A highly inflammable gas
(C) A Black solid.
(D) A red liquid.

4. The metal used in storage batteries —
(A) Iron
(B) Copper
(C) Lead
(D) Zinc

5. Water has maximum density at —
(A) –4°C
(B) 0°C
(C) 4°C
(D) 100°C

6. The chemial name of Uria is —
(A) Aneurin
(B) Chloroetane
(C) Carbamide
(D) None of these

7. Permanent hardness of water can be removed by adding —
(A) Potassium Permanganate
(B) Chlorine
(C) Bleaching Powder
(D) Washing Soda

8. The formula of Plaster of Paris is —
(A) CaSO₄
(B) CaSO₄, 2H₂O
(C) 2CaSO₄, 4H₂O
(D) 2CaSO₄, H₂O

9. Which of the following substance is a bad conductor of electricity but a good conductor of heat?
(A) Asbestos
(B) Celluloid
(C) Purspecks
(D) Mica

10. Carborandum is —
(A) Silicon Dioxide
(B) Silicon Carbide
(C) Silicon Nitride
(D) Silicon Phosphide

11. Which of the following is the best conductor of electricity ?
(A) Copper
(B) Mica
(C) Zinc
(D) Silver

12. Washing soda is the common name of —
(A) Calcium Carbonate
(B) Calcium Bi-Carbonate
(C) Sodium Carbonate
(D) Sodium Bi-Carbonate

13. The filament of electric bulb is made of —
(A) Iron
(B) Nichrome
(C) Tungsten
(D) Graphite

14. Bleaching powder is made from —
(A) Sulphur dioxide and gypsum
(B) Chlorine and Charcoal
(C) Soda ash and lime
(D) Lime and Chlorine

15. The two elements that are frequently used for making transistors are —
(A) Boron and Aluminium
(B) Silicon and Germenium
(C) Iridium and Tungsten
(D) Niobium and Columbium

16. Which of the following gas is not known as green house gas ?
(A) Methane
(B) Carbon dioxide
(C) Nitrous oxide
(D) CFC

17. Which of the following is not a neutral oxide ?
(A) Carbon Monoxide
(B) Sulphur Dioxide
(C) Water
(D) Nitric Oxide

18. Which of the following is used in making smoke bombs ?
(A) Sulphur
(B) Phosphorus
(C) Hydrogen
(D) Carbon

19. Caustic Soda is —
(A) Nacl
(B) Na₂CO₃
(C) NaOH
(D) NaHCO₃

20. Chemical formula of Water glass is —
(A) Na₂SiO₃
(B) Al₂O₃
(C) NaAlO₂
(D) CaSiO₃

21. Which of the following is not a bleaching agent?
(A) Sulpher di-oxide
(B) Carbon di-oxide
(C) Sodium hypochlorite
(D) Chlorine

22. The gas usually filled in electric bulb is —
(A) Hydrogen
(B) Oxygen
(C) Nitrogen
(D) Carbon di-oxide

23. Heavy water is —
(A) Tritium oxide
(B) Deuterium oxide
(C) Rain water
(D) Water at 4°C

24. The gases used in different types of welding would include —
(A) Oxygen & Hydrogen
(B) Oxygen, acetylene & argon
(C) Oxygen & acetylene
(D) Oxygen, hydrogen & nitrogen

25. Which of the following alloys is used for making magnets ?
(A) Duralumin
(B) Stainless Steel
(C) Alnico
(D) Magnelium

Answers:
1. (D) 2. (B) 3. (D) 4. (C) 5. (A) 6. (C) 7. (D) 8. (D) 9. (D) 10. (B) 11. (D) 12. (C)
13. (C) 14. (D) 15. (B) 16. (C) 17. (B) 18. (B) 19. (C) 20. (A) 21. (B) 22. (C) 23. (B) 24. (C) 25. (C

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