General Science - Important Questions and Answers - 6

1. Tetraethyl lead is used as–
(A) Mosquito repellent (B) Pain Killer
(C) Fire extinguisher (D) Petrol additive (Ans : D)

2. Which of the following is used in beauty parlours for hair setting ?
(A) Phosphorus (B) Sulphur
(C) Chlorine (D) Silicon (Ans : B)

3. Which of the following is a non-metal that remains liquid in room temperature ?
(A) Bromine (B) Chlorine
(C) Helium (D) Phosphorus (Ans : A)

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

5. The gas usually filled in electric bulb is–
(A) Hydrogen (B) Oxygen
(C) Nitrogen (D) Carbon di-oxide (Ans : C)


6. Heavy water is–
(A) Tritium oxide (B) Deuterium oxide
(C) Rain water (D) Water at 4°C (Ans : B)

7. Cow milk is a rich source of–
(A) Vitamin A (B) Vitamin B1
(C) Vitamin C (D) Vitamin D (Ans : B)

8. The element found in the surface of the Moon is–
(A) Tin (B) Tungsten
(C) Tantalum (D) Titanium (Ans : D)

9. The average salinity of sea water is–
(A) 2% (B) 3%
(C) 2.5% (D) 3.5% (Ans : D)

10. The isotope of Uranium capable of sustaining chain reaction is–
(A) U 235 (B) U 238
(C) U 239 (D) None of these (Ans : A)

11. Radioactive disintegration of Uranium ultimately results in formation of–
(A) Radium (B) Thorium
(C) Polonium (D) Lead (Ans : D)

12. Atom bomb is made on the basis of–
(A) Nuclear fusion (B) Nuclear fission
(C) Both (A) and (B) (D) None of these (Ans : B)

13. Which of the following is the petroleum wax ?
(A) Bees wax (B) Carnauba wax
(C) Paraffin wax (D) Jojoba wax (Ans : C)

14. Which of the following fibres is generally preferred for making gauze and lint ?
(A) Cotton (B) Rayon
(C) Nylon (D) Terylene (Ans : B)

15. Rubber is coagulated from latex by adding–
(A) Hydrochloric acid (B) Acetic acid
(C) Sulphuric acid (D) Carbonic acid (Ans : B)

16. Which of the following metals can displace hydrogen from dilute acids ?
(A) Zinc (B) Gold
(C) Copper (D) Silver (Ans : A)

17. Reaction of alcohol, with carboxylic acid is known as–
(A) Substitution reaction (B) Addition reaction
(C) Esterification (D) Hydrogenation (Ans : C)

18. Saponification involves the hydrolysis of fats and oils by–
(A) Water (B) Washing soda
(C) Stearic acid (D) Caustic acid (Ans : D)

19. Ascorbic acid is–
(A) Vitamin K (B) Vitamin B
(C) Vitamin A (D) Vitamin C (Ans : D)

20. Sterility in some animals is caused due to deficiency of–
(A) vitamin B (B) vitamin D
(C) vitamin B12 (D) vitamin E (Ans : D)

21. At the boiling temperature an enzyme becomes–
(A) killed (B) denatured
(C) uneffected (D) inactivated (Ans : B)

22. The penetrating power is maximum in–
(A) a-rays (B) b-rays
(C) g-rays (D) cathode rays (Ans : A)

23. Which of the following rays carry no charge ?
(A) Cathode rays (B) X-rays
(C) a-rays (D) Positive rays (Ans : B)

24. An atom bomb is based on the principle of–
(A) Chemical reaction (B) Chain reaction in the form of fission
(C) Nuclear fusion (D) None (Ans : B)

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