General Science 9

1. The term ‘enzyme’ was coined by —
(A) de Duve
(B) Kunhe
(C) C. Darwin
(D) de Candolle

2. Which set of conditions represents easiest way to liquify gas ?
(A) Low temperature, high pressure
(B) High temperature, low pressure
(C) Low temperature, low pressure
(D) High temperautre, high pressure

3. Artificial rain is caused by spraying small pellets of which of the following over clouds ?
(A) Ice
(B) Dry Ice
(C) NaOH
(D) NH4Cl

4. Galvanisation is deposition of —
(A) Zinc of iron
(B) aluminium on Iron
(C) tin on iron
(D) copper on iron

5. Equal volumes of different gases at any definite temperature and pressure have —
(A) Equal weights
(B) equal masses
(C) equal density
(D) equal no. of molecules

6. Milk is an example of —
(A) suspension
(B) true solution
(C) emulsion
(D) gel

7. Which of the following modes of expressing concentration is independent of temperature —
(A) Molarity
(B) Molality
(C) Normality
(D) Formality

8. If temperature is kept constant during the reaction the process is called —
(A) Adiabatic
(B) Isobaric
(C) Isochoric
(D) Isothermal

9. Cholera is caused by —
(A) vibrio cholerae
(B) salmonella
(C) bacterioceoccurs
(D) None of these

10. Why do colloidal substance do not deposited below ?
(A) Specific gravity is less
(B) It is of very less amount in respect of solvent
(C) They carry electrical charges
(D) They are converted to sovent

11. Lightening cause rainfall because —
(A) It cause combination of oxygen and nitrogen
(B) Some of the gas molecules become bigger
(C) It activate H2O molecule
(D) Photo-electricity reaction starts

12. Nitrification means —
(A) Liquifaction of nitrogen
(B) Convert the atmospheric nitrogen to effective nitrogen compound.
(C) Production of nitrogen from air
(D) Conversion of nitrogen to nitric acid.

13. Cell membrane is —
(A) permeable
(B) selectively permeable
(C) semipermeable
(D) impermeable

14. Cholesterol is one kind of —
(A) Saturated fatty acid
(B) unsaturated fatty acid
(C) Steroid
(D) Diglyceride

15. 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

16. White vitriol is —
(A) FeSO4, 7H2O
(B) ZnSO4, 7H2O
(C) MgSO4, 7H2O
(D) CuSO4, 7H2O

17. C.T. Scanning uses —
(A) Ultrasound waves
(B) Gamma rays
(C) X-rays
(D) None of the above

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

19. A mixture of salt and sand can be separated by —
(A) Sublimation
(B) Dissolving water
(C) Gravity separation
(D) Dry distillation

20. Saponification involves the hydrolysis of fats and oils by —
(A) water
(B) washing soda
(C) stearic acid
(D) caustic soda

21. Photo-synthesis is a/ an —
(A) exothermic process
(B) endothermic process
(C) a neutral process
(D) a thermostatic process

22. Which of the following is a physical change ?
(A) oxidation
(B) reduction
(C) sublimation
(D) decomposition

23. Which of the following is not a chemical reaction ?
(A) Burningof paper
(B) Digestion of food
(C) Conversion of water into steam
(D) Burning of coal

24. Which of the following is a chemical change ?
(A) Rusting of iron
(B) Tempering of iron
(C) Melting of iron
(D) Bending of iron

25. Photoelectric effect was discovered by —
(A) Einstein
(B) Hertz
(C) Bohr
(D) Plank

Answers: 1. (B) 2. (A) 3. (C) 4. (A) 5. (D) 6. (C) 7. (B) 8. (D) 9. (A) 10. (A)
11. (C) 12. (B) 13. (C) 14. (A) 15. (C) 16. (B) 17. (A) 18. (A) 19. (B) 20. (D)
21. (B) 22. (C) 23. (C) 24. (A) 25. (A) 
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