A. He
B. H2
C. N2
D. O2
Answer –B. H2
Explanation-
12. Silk fibre chemically is : [SSC CGL Prelim 2002]
A. Carbohydrate
B. Fat
C. Protein
D. Cellulose
Answer –C. Protein
Explanation-
13. The substance which does not expand on going from liquid state to solid state is – [SSC Section Officer (Audit) 2001]
A. Water
B. Cast-iron
C. Aluminium
D. Type metal
Answer –D. Type metal
Explanation-
14. Which among the following is a carbohydrate? [SSC Section Officer (Audit) 1997]
A. Nylon
B. Cane-sugar
C. Turpentine
D. Hydrogen peroxide
Answer –B. Cane-sugar
Explanation-
15. Soap is prepared by boiling caustic soda with [SSC CGL Prelim 2003]
A. Alcohol
B. Kerosene oil
C. Glycerine
D. Fats
Answer –D. Fats
Explanation-
16. The natural source of hydro-carbon is_ [SSC CPO Sub-Inspector 2003]
A. Crude oil
B. Biomass
C. Coal
D. Carbohydrates
Answer –A. Crude oil
Explanation-
17. By which organic compound all the oils are known ?[SSC CG Level Prelim 2002]
A. Carbohydrate
B. Protein
C. Hydrocarbon
D. Ester
Answer –C. Hydrocarbon
Explanation-
18. Which of the following is used as a lubricant in heavy machines? [SSC Section Officer (Audit) 2001]
A. Bauxite
B. Sulphur
C. Phosphorus
D. Graphite
Answer –D. Graphite
Explanation-
19. What happens when a chemical bond is formed ? [SSC Section Officer (Audit) 1997]
A. energy is always absorbed
B. energy in always released
C. more energy is released tha is absorbed
D. energy is neither released nor absorbed
Answer –A. energy is always absorbed
Explanation-
20. The three elements most needed in common fertilisers are : [SSC CGL Prelim 2000]
A. Sulphur, Phosphorous and Sodium
B. Nitrogen, Potassium and Phosphorous
C. Phosphorous, Sodium and Nitrogen
D. Calcium, Phosphorous and Potassium
Answer –B. Nitrogen, Potassium and Phosphorous
Explanation-
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