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General Science Day 1

Q1. For instant energy, athletes take 

(a) Sucrose 

(b) Vitamin C

(c) Sodium chloride

(d) Milk

Q2. For protection against gamma radiations, the shields used should be made of

(a) Iron 

(b) Lead

(c) Copper

(d) Tin

Q3. Froth flotation is generally used for the concentration of 

(a) Oxide ores

(b) Sulphate ores

(c) Sulphide ores

(d) Carbonate ores

Q4. Soaps are obtained from oils and fats by

(a) Acid hydrolysis

(b) Saponification

(c) Steam hydrolysis

(d) Fat splitting

Q5. Gelatin is added to ice cream to

(a) Hasten freezing

(b) Avoid crystal formation

(c) Give flavor and taste

(d) None of the above

Q6. Glass is a good

(a) Insulator

(b) Semi-conductor

(c) Electrical conductor

(d) Thermal conductor

Q7. Glycol is added to aviation petrol because it

(a) Minimizes the loss of petrol

(b) Increases the efficiency of the fuel

(c) Prevents the engine from heating up

(d) Prevents the freezing of petrol

Q8. Gypsum is

(a) CaSO_4 2H_2 O

(b) 2CaSO_4 H_2 O

(c) BaSO_4

(d) MgSO_4 7H_2 O

Q9. Heavy water is

(a) H_2 O^18

(b) D_2 O

(c) Water at 4 °C

(d) Water obtained by repeated distillation

Q10. The brown ring test is used for the 

(a) Analysis of nitrates

(b) Identification of certain elements in a solution

(c) Measurement of nitrogen in an organic compound

(d) None of the above

Q11. Helium is preferred to hydrogen in airships because helium

(a) Has greater lifting power

(b) Is less dense

(c) Is cheaper

(d) Does not form explosive mixtures with air

Q12. Helium is used in gas balloons instead of hydrogen because it is

(a) Lighter than hydrogen

(b) Easily available

(c) Incombustible

(d) Chemically inert

Q13. Hess’s Law is associated with

(a) Heat exchange in a chemical reaction

(b) Decomposition during electrolysis

(c) Effect of pressure on gases

(d) None of the above

Q14. How can a heap of oily clothes catch fire without the presence of a flame?

(a) When the oil comes into contact with oxygen, it catches fire

(b) The oil undergoes oxidation resulting in heat which, if allowed to accumulate, causes the clothes to catch fire

(c) The air moving over oily clothes produces friction and inevitably causes fire

(d) It is not possible

Q15. Insulin is

(a) An enzyme 

(b) A vitamin

(c) Hormone

(d) A synthetic drug

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