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General Science Bits for All Competitive Exams

1. The most abundant metal in the earth’s  crust is–
A. Zinc
B. Copper
C. Aluminium
D. Iron

2. The gas used to extinguish fire is–
A. Neon
B. Nitrogen
C. Carbon dioxide
D. Carbon Monoxide

3. In which of the following activities Silicon Carbide is used ?
A. Making cement and glass
B. Disinfecting water and ponds
C. Making castes for statues
D. Cutting very hard substances

4. The two elements that are frequently used for making transistors are–
A. Boron and Aluminium
B. Silicon and Germenium
C. Iridium and Tungsten
D. Niobium and Columbium

5. Which of the following gas is not known as green house gas ?
A. Methane
B. Carbon dioxide
C. Nitrous oxide

6. Which of the following is not a neutral oxide ?
A. Carbon Monoxide
B. Sulphur Dioxide
C. Water
D. Nitric Oxide

7. Potassium Permanganate is used for purifying drinking water, because–
A. It dissolves the impurities of water
B. It is a sterilizing agent
C. It is an oxidising agent
D. It is a reducing agent.

8. The presence of which of the following salts in water causes corrosion in steam boilers ?
A. Sodium Chloride
B. Magnesium Chloride
C. Calcium bicarbonate
D. Potassium bicarbonate

9. Water is a good solvent of ionic salts because–
A. It has no colour
B. It has a boiling point
C. It has a high dipole moment
D. It has a high specific heat

10. Nuclear fission is caused by the impact of–
A. Proton
B. Electron
C. Neutron
D. (A) and (b)

11. Which is a good nuclear fuel ?
A. Uranium – 238
B. Neptunium – 239
C. Thorium – 236
D. Plutonium – 236

12. Long distance photography is facilitated by–
A. Visible light
B. X-rays
C. Infra Red rays
D. Ultra violet rays

13. Which of the following is used in making artificial sweetener saccharine ?
A. Benzene
B. Toluene
C. Phenol
D. Aniline

14. Rayon is chemically–
A. Glucose
B. Amylase
C. Cellulose
D. Peptin

15. Which of following is used as a filter in rubber tyres?
A. Graphite
B. Coal
C. Coke
D. Carbon Black

16. Which of the following substances exhibit the property of sublimation ?
A. Ice
B. Wax
C. Camphor
D. Ethyl Alcohol

17. Combustion is the process in which–
A. Heat is produced
B. Light is produced
C. Heat and Light is produced
D. None of these

18. The chemical used as a fixer in photography is–
A. Borax
B. Sodium thiosulphate
C. Sodium Sulphate
D. Ammonium persulphate

19. Vitamins are–
A. inorganic substances which cannot be synthesized by animals
B. inorganic by animals
C. organic substances that cannot be generally synthesized by animals
D. organic substances which can be commonly synthesized by animals

20. Richest source of vitamin B1(thiamine) is
A. cod liver oil
B. curd
C. whole bread meal
D. eggs

21. One of these vitamins is called erythrocyte maturation factor–
A. A
B. C
C. K
D. B12

22. Saponification involves the hydrolysis of fats and oils by–
A. water
B. washing soda
C. stearic acid
D. caustic soda

23. Photo-synthesis is a/ an–
A. exothermic process
B. endothermic process
C. a neutral process
D. a thermostatic process

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

25. 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

26. The element common to all acids is–
A. Oxygen
B. Hydrogen
C. Nitrogen
D. Sulphur

27. Gobar gas contains mainly–
A. Methane
B. Carbon dioxide
C. Butane
D. Carbon Monoxide

28. The most malleable metal is–
A. Silver
B. Gold
C. Aluminium
D. Sodium

29. Which of the following is used in making smoke bombs ?
A. Sulphur
B. Phosphorus
C. Hydrogen
D. Carbon

30. Caustic Soda is–
A. Nacl
B. Na2CO3

31. Chemical formula of Water glass is–
A. Na2SiO3
B. Al2O3
C. NaAlO2
D. CaSiO3

32.The hardest substance available in earth is
A. Platinum
B. Silicon
C. Diamond
D. Gold

33. Which of the following is the best conductor of electricity ?
A. Zinc
B. Copper
C. Gold
D. Silver

34. The ratio of pure gold in 18 carat gold is
A. 60%
B. 75%
C. 80%
D. 100%

35. Which radioactive pollutant has recently drawn the attention of the public due to its occurance in the building materials ?
A. Radium
B. Radon
C. Thorium
D. Plutonium

36. In an atomic explosion enormous energy is released which is due to the–
A. Conversions of neutrons into protons
B. Conversion of chemical energy into nuclear energy
C. Conversion of mechanical energy into nuclear energy
D. Conversion of mass into energy

37. Which of the following is used as a coolant in nuclear reactors ?
A. Heavy water
B. Cadmium
C. Liquid sodium
D. Graphite

38. In vulcanization, natural rubber is heated with–
A. Carbon
B. Sulphur
C. Silicon
D. Phosphorus

39. Which type of fire extinguisher is used for petroleum fire ?
A. Foam type
B. Soda acid type
C. Powder type
D. None of these

40. Which is/ are the important raw materials in cement industry ?
A. Limestone
B. Gypsum and Clay
C. Clay
D. Limestone and Clay

41. A mixture of iron filings and sand can be separated by–
A. Heating
B. Sublimation
C. Hand picking
D. Magnetic Separation

42. In which of the following process, Vanadium Pentoxide is used as a catalyst ?
A. Contact process
B. Haber process
C. Solvary process
D. None of these

43. The rate of chemical reaction does not depend on–
A. Concentration
B. Catalyst
C. Temperature
D. Pressure

44. The vitamin which can be synthesized in the gut by bacterial action is–
A. vitamin B1
B. vitmain B2
C. vitmain B12
D. All above

45. Deficiency of vitamin D causes–
A. rickets
B. beri-beri
C. scurvy
D. night blindness

46. Which one of the following is the best source of vitamin A?
A. Apple
B. Carrot
C. Amla
D. Raddish

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

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

49. Photoelectric effect was discovered by–
A. Einstein
B. Hertz
C. Bohr
D. Plank

50. The hydrogenation of the vegetables oils takes place in the presence of finely divided–
A. aluminium
B. charcoal
C. silica
D. nickel

Answers :  
1. c       2.c      3.d       4.b      5.c        6.b       7.c       8.b       9.c     10.c
11.c    12.c     13.b     14.c    15.d      16.c     17.c     18.b     19.c     20.c
21.d    22.d    23.b     24.c     25.c      26.b     27.a     28.b     29.b    30.c
31.a    32.c     33.d     34.b     35.c     36.d     37.c     38.b     39.c     40.d
41.d    42.a     43.d     44.d     45.a     46.b     47.c     48.a     49.a     50.d 

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