General Science - Important Questions and Answers - 3

1. Which of the following is the best conductor of Electricity ?
(A) Ordinary water (B) Sea water
(C) Boiled water (D) Distilled water (Ans : B)

2. Balloons are filled with–
(A) Helium (B) Oxygen
(C) Nitrogen (D) Argon (Ans : A)

3. The charcoal used to decolourise raw sugar is–
(A) Animal charcoal (B) Sugar charcoal
(C) Cocoanut charcoal (D) Wood charcoal (Ans : D)

4. Washing soda is the common name of–
(A) Calcium Carbonate (B) Calcium Bi-Carbonate
(C) Sodium Carbonate (D) Sodium Bi-Carbonate (Ans : C)

5. The filament of electric bulb is made of–
(A) Iron (B) Nichrome
(C) Tungsten (D) Graphite (Ans : C)



6. Bleaching powder is made from–
(A) Sulphur dioxide and gypsum (B) Chlorine and Charcoal
(C) Soda ash and lime (D) Lime and Chlorine (Ans : D)

7. Brass is an alloy of–
(A) Nickel and Copper (B) Copper and Silver
(C) Nickel and Zinc (D) Zinc and Copper (Ans : D)

8. The element required for Solar energy conversion–
(A) Beryllium (B) Silicon
(C) Tantalum (D) Ultra pure carbon (Ans : B)

9. Monazite is an ore of–
(A) Sodium (B) Titanium
(C) Thorium (D) Zirconium (Ans : C)

10. The gas usually causing explosions in coal mines is–
(A) Hydrogen (B) Carbon monoxide
(C) Air (D) Methane (Ans : D)

11. Cotton fibers are made of–
(A) cellulose (B) starch
(C) proteins (D) fats (Ans : A)

12. Which of the following ores does not contain iron?
(A) Haematite (B) Magnetite
(C) Limonite (D) Cassiterite (Ans : D)

13. Which variety of glass is heat resistant ?
(A) Hard glass (B) Flint glass
(C) Pyrex glass (D) Bottle glass (Ans : C)

14. Which of the following is used for removing air bubbles from glass during its manufacture ?
(A) Fledspar (B) Arsenic oxide
(C) Potassium Carbonate (D) Soda Ash (Ans : B)

15. What are soaps ?
(A) Salts of silicates (B) Ester of heavy fatty acids
(C) Sodium or potassium salts of heavier fatty acids (D) Mixture of glycerol and alcohol (Ans : C)

16. In which following processes light energy is converted into chemical energy ?
(A) Respiration (B) Fermentation
(C) Photosynthesis (D) Photorespiration (Ans : C)

17. Cooking oil can be converted into vegetables ghee by the process of–
(A) Oxidation (B) Hydrogenation
(C) Distillation (D) Crystallisation (Ans : B)

18. Photosynthesis is–
(A) An exothermic process (B) An endothermic process
(C) A neutral process (D) A thermostatic process (Ans : B)

19. J. B. Sumner isolated first enzyme from Jackbeans as–
(A) amylase (B) trypsin
(C) urease (D) renin (Ans : C)

20. Enzymes are absent in–
(A) fungi (B) bacteria
(C) viruses (D) algae (Ans : C)

21. The enzymes sucrase acts on–
(A) sucrose only (B) sucrose and starch
(C) all disaccharides (D) any organic monomer (Ans : A)

22. C.T. Scanning uses–
(A) Ultrasound waves (B) Gamma rays
(C) X-rays (D) None of the above (Ans : A)

23. Chemically ‘speropolenin’ is a / an–
(A) co-polymer of carotinoid and fatty acid (B) Carbohydrate
(C) Propene (D) Lactic acid (Ans : A)

24. A mixture of salt and sand can be separated by–
(A) Sublimation (B) Dissolving water
(C) Gravity separation (D) Dry distillation (Ans : B)

25. PVC is obtained by the polymerisation of–
(A) propane (B) vinyl chloride
(C) styrene (D) Acetylene (Ans : B)