1000+ General Chemistry MCQ for DRDO [Solved]

1. Coke is a substance obtained
A. from coal mines
B. when wood is burnt in excess of air
C. by heating coal out of contact with air
D. by heating wood out to contact with air
Answer : C

2. Which or the following is not a constituent or gun powder?
A. Ammonium nitrate
B. Nitre
C. Charcoal powder
D. Sulphur
Answer : A

3. Which of the following act a both u oxidising and reducing agent?
A. nitric acid
B. ammonia
C. nitrous acid
D. nitrogen peroxide
Answer : C

4. According to the modern Periodic Law, the properties of elements are periodic functions of their
A. valency
B. atomic mass
C. number of neutrons
D. atomic number
Answer : D

5. Which of the following is used as an illuminant?
A. Gasoline
B. Benzoline
C. Kerosene
D. Petroleum ether
Answer : C

6. Hypo' is
A. sodium nitrate
B. Potassium nitrate
C. sodium thiosulphate
D. ammonium chloride
Answer : C

7. White vitriol is
A. ZnSO4 . 7H2O
B. FeSO4 . 7H2O
C. MgSO4 . 7H2O
D. CaSO4 . 2H2O
Answer : A

8. Which one of the following gases is extremely soluble in water?
A. Carbon dioxide
B. Ammonia
C. Chlorine
D. Hydrogen sulphide
Answer : B

9. Deficiency of iron causes
A. nervous disorders
B. heart diseases
C. anaemia
D. impairment of vision
Answer : C

10. On chemical analysis, a bottle cork is found to contain primarily
A. proteins
B. carbohydrates
C. tannins
D. lipids
Answer : B

11. Acute diabetes patients smell of
A. acetone
B. ether
C. ethyl alcohol
D. methyl alcohol
Answer : A

12. Which of the following types of water gives lather easily with soap?
A. Hard water
B. Heavy water
C. Soft water
D. Both (a) and (b)
Answer : C

13. The alloy added in the preparation of steel contains
A. Fe and C
B. Mn and C
C. Fe and Mn
D. Fe, Mn and C
Answer : D

14. The science which deals with the chemistry of life processes is known as
A. electrochemistry
B. physical chemistry
C. biochemistry
D. tinctorial chemistry
Answer : C

15. The purest form of carbon is
A. animal charcoal
B. coal
C. wood charcoal
D. sugar charcoal
Answer : D

16. Which of the following is not a food material?
A. silicate
B. protein
C. fat
D. carbohydrate
Answer : A

17. Heavy water was discovered by
A. TW Richards
B. FW Aston
C. Stas
D. Urey
Answer : D

18. Vinegar is an aqueous solution of
A. oxalic acid
B. citric acid
C. acetic acid
D. hydrochloric acid
Answer : C

19. The alloy which is extremely hard and resistant to acids is
A. chrome steel
B. silicon steel
C. stainless steel
D. invar
Answer : B

20. Ozone is an allotrope of Oxygen, containing ______ atom/s of oxygen per molecule instead of two.
A. three
B. four
C. one
D. five
Answer : A

21. Jeweller's rouge is
A. magnetic oxide of iron
B. ferric oxide
C. ferrous oxide
D. ferrous carbonate
Answer : B

22. The formula for cane sugar is
A. C6H12O6
B. C2H5OH
C. C12H22O11
D. C7H8O
Answer : C

23. Radium was isolated from
A. galena
B. dolomite
C. sylvine
D. pitchblende
Answer : D

24. Laughing gas is
A. nitric oxide
B. nitrogen peroxide
C. nitrogen pentoxide
D. nitrous oxide
Answer : D

25. The substance most abundantly found in sea water is
A. magnesium chloride
B. sodium chloride
C. calcium sulphate
D. potassium chloride
Answer : B

26. The term 'nucleons' apples to
A. neutrons
B. protons
C. protons and neutrons
D. protons and electrons
Answer : C

27. The rate of setting of cement is slowed down by the addition of
A. quicklime
B. gypsum
C. soda lime
D. bleaching powder
Answer : B

28. Plaster of Paris
A. contracts while setting
B. expands while setting
C. is highly volatile
D. does not suffer any changes in volume while setting
Answer : B

29. The most abundant noble gas present in air is
A. neon
B. argon
C. helium
D. krypton
Answer : B

30. Setting of cement is due to
A. hydration
B. dehydration
C. dialysis
D. osmosis
Answer : A

31. Lead pencils contain
A. white lead
B. graphite
C. red lead
D. coke
Answer : B

32. The freezing point of water at 760 mm pressure is
A. 273 K
B. 0 K
C. 273°C
D. -273°C
Answer : A

33. The compound used in photography is
A. ammonium dichromate
B. copper Sulphate
C. magnesium Sulphate
D. sodium thiosulphate
Answer : D

34. The atomic number of an element represents
A. number of neutrons in the nucleus
B. number of protons and neutrons in the nucleus
C. the valency of the element
D. number of protons in the nucleus
Answer : D

35. Two or more entirely different compounds having the same molecular formula are known as
A. isobars
B. isotopes
C. isomorphs
D. isomers
Answer : D

36. The value of Avogadro Number is
A. 6.023 x 1022
B. 1 x 10-14
C. cl 6.056 x 10-6
D. 6.023 x 1023
Answer : D

37. In photography, the compound or nitrogen used is
A. Potassium nitrate
B. Silver nitrate
C. Ammonium carbonate
D. Ammonium bicarbonate
Answer : B

38. A light alloy having high tensile strength is
A. German silver
B. solder
C. magnalium
D. bell metal
Answer : C

39. Which or the following gases is soluble in water and Is collected by the downward displacement or air?
A. Carbon dioxide
B. Sulphur dioxide
C. Ammonia
D. Hydrogen
Answer : C

40. Soda-water contains
A. sodium bicarbonate
B. sodium carbonate
C. carbonic acid
D. sodium hydroxide
Answer : C

41. One method by which the components of air can be separated is
A. shaking with caustic soda solution
B. shaking with water
C. fractional distillation of liquid air
D. passing air over heated magnesium
Answer : C

42. The scientist who synthesised the first organic compound (urea) in the laboratory was
A. Wohler
B. Dalton
C. Lavoisier
D. Fischer
Answer : A

43. Apart from lead tetra-ethyl, the other compound used as antiknock is
A. n-heptane
B. n-octane
C. iso-heptane
D. iso-octane
Answer : D

44. Iron is coated with zinc to prevent rusting. The process is called
A. annealing
B. tempering
C. calcining
D. galvanising
Answer : D

45. A mixture of naphthalene and sand is separated by
A. evaporation
B. using a magnet
C. sublimation
D. sedimentation
Answer : C

46. Galvanising is the process of coating
A. iron with zinc
B. zinc with iron
C. copper with silver
D. silver with gold
Answer : A

47. Which of the following biology laboratory?
A. Phenol
B. Benzaldehyde
C. Formaldehyde
D. Acetic acid
Answer : C

48. Rusting is a special case of corrosion applied to
A. nickel
B. tin
C. iron
D. chromium
Answer : C

49. Glass is a ______ mixture of metallic ______.
A. homogeneous, sulphates
B. heterogeneous, nitrates
C. heterogeneous, carbonates
D. homogeneous, silicates
Answer : D

50. A metal which exhibits allotropy is
A. cobalt
B. tin
C. manganese
D. platinum
Answer : B