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TNPSC General Science-Important Questions & Answers (101-120)

1. PVC is obtained by the Polymerisation of?

(A) propane 
(B) vinyl chloride
(C) styrene 
(D) Acetylene 

(Answer : B)
2. The gas used to extinguish fire is?

(A) Neon 
(B) Nitrogen
(C) Carbon dioxide 
(D) Carbon Monoxide 

(Answer : C)
3. The process by which an organic compound breaks down into simpler compounds on heating to high temperature is known as?

(A) Aromatisation 
(B) Polymerisation
(C) Pyrolysis 
D) Reduction 

(Answer : C)
4. Cotton fibers are made of?

(A) cellulose 
(B) starch
(C) proteins 
(D) fats 

(Answer : A)
5. Which variety of glass is heat resistant?

(A) Hard glass 
(B) Flint glass
(C) Pyrex glass 
(D) Bottle glass 

(Answer : C)
6.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 

(Answer : B)
7. In which following processes light energy is converted into chemical energy?

(A) Respiration 
(B) Fermentation
(C) Photosynthesis 
(D) Photorespiration 

(Answer : C)
8. Photosynthesis is?

(A) An exothermic process 
(B) An endothermic process
(C) A neutral process 
(D) A thermostatic process 

(Answer : B)
9. Brass is an alloy of?

(A) Nickel and Copper 
(B) Copper and Silver
(C) Nickel and Zinc 
(D) Zinc and Copper 

(Answer : D)
10. Ethyl-alcohol is mixed completely with water. How ethyl alcohol is separated from the mixture ?

(A) by separation flannel 
(B) by evaporation
(C) partial-distillation 
(D) evaporation of water 

(Answer : C)
11. Washing soda is the common name of?

(A) Calcium Carbonate 
(B) Calcium Bi-Carbonate
(C) Sodium Carbonate 
(D) Sodium Bi-Carbonate 

(Answer : C)
12. Bleaching powder is made from?

(A) Sulphur dioxide and gypsum 
(B) Chlorine and Charcoal
(C) Soda ash and lime 
(D) Lime and Chlorine
 
(Answer : D)
13. The most abundant metal in the earth’s crust is?

(A) Zinc 
(B) Copper
(C) Aluminium 
(D) Iron 

(Answer : C)
14. Long distance photography is facilitated by?

(A) Visible light 
(B) X-rays
(C) Infra Red rays 
(D) Ultra violet rays
 
(Answer : C)
15. The chemical used as a fixer in photography is–(A) Borax (B) Sodium thiosulphate
(C) Sodium Sulphate (D) Ammonium persulphate (Ans : B)

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

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

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

19. 16. Polythene is industrially prepared by the polymerization of–(A) Methane (B) Styrene
(C) Acetylene (D) Ethylene (Ans : D)

20. 5. Carborandum is–(A) Silicon Dioxide (B) Silicon Carbide
(C) Silicon Nitride (D) Silicon Phosphide (Ans : B)

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