general science

Chemistry MCQ Questions and Answers page - 6

1.

In Modern Periodic Table, the atomic radius increases  ________ .

Answer/ Hint      

Answer : B

Explanation :

2.

Which of the following statement(s) is/are CORRECT ?

Answer/ Hint      

Answer : B

Explanation :

3.

Cement is made hard with

Answer/ Hint      

Answer : B

Explanation :

4.

Commercial nitric acid is coloured because it contains dissolved  :

Answer/ Hint      

Answer : C

Explanation :

5.

Fertiliser having high nitrogen content is  :

Answer/ Hint      

Answer : A

Explanation :

6.

What is the chemical name for  ‘baking soda’  ?

Answer/ Hint      

Answer : B

Explanation :

7.

Which of the following gases is present under pressure in soft drinks  ?

Answer/ Hint      

Answer : C

Explanation :

8.

Table salt gets moist during rainy season because

Answer/ Hint      

Answer : D

Explanation :

9.

Which of the following is used to iodise common salf  ?

Answer/ Hint      

Answer : C

Explanation :

10.

Milk is a colloidal system in which  :

Answer/ Hint      

Answer : B

Explanation :

11.

The major harmful gas emitted by automobile vehicle which causes air pollution is

Answer/ Hint      

Answer : C

Explanation :

12.

The acid used in lead storage cells is

Answer/ Hint      

Answer : D

Explanation :

13.

What is  “milk of magnesia”  chemically  ?

Answer/ Hint      

Answer : D

Explanation :

14.

Soap is prepared by boiling caustic soda with

Answer/ Hint      

Answer : D

Explanation :

15.

Which among the following stage is suitable indicator when solution of sodium carbonate is mixed with sulphuric acid  ?

Answer/ Hint      

Answer : D

Explanation :

16.

Bauxite is an alloy of which of the following metals  ?

Answer/ Hint      

Answer : A

Explanation :

17.

Which is abundant in Gobar gas  ?

Answer/ Hint      

Answer : B

Explanation :

18.

The advantage of detergents over soaps is

Answer/ Hint      

Answer : C

Explanation :

19.

Bleaching action of moist sulphur dioxide is because of its

Answer/ Hint      

Answer : C

Explanation :

20.

Which of the following is a natural dye  ?

Answer/ Hint      

Answer : C

Explanation :

21.

Which amidst the following is not a gem stone  ?

Answer/ Hint      

Answer : A

Explanation :

22.

The metallic constituents of hard water are  :

Answer/ Hint      

Answer : C

Explanation :

23.

The pH of human blood is between  :

Answer/ Hint      

Answer : B

Explanation :

24.

Which of the following imparts deep blue colour to glass  ?

Answer/ Hint      

Answer : D

Explanation :

25.

Which of the following chemical materials is responsible for the depletion of ozone layer in the atmosphere  ?

Answer/ Hint      

Answer : C

Explanation :

26.

Which of the following is the main nitrogenous waste in humans  ?

Answer/ Hint      

Answer : B

Explanation :

27.

Detergents used for cleaning clothes and utensils contain

Answer/ Hint      

Answer : C

Explanation :

28.

Which of the following is a supercooled liquid  ?

Answer/ Hint      

Answer : C

Explanation :

29.

Which of the following is used to remove rust stains on cloth  ?

Answer/ Hint      

Answer : C

Explanation :

30.

Tear gas is  :

Answer/ Hint      

Answer : B

Explanation :

31.

Which of the following compounds is commonly used as an antiseptic in mouthwashes and toothpastes  ?

Answer/ Hint      

Answer : D

Explanation :

32.

Which one of the following is used to restore the colour of old oil-paintings  ?

Answer/ Hint      

Answer : B

Explanation :

33.

Heat resistant variety of glass is 

Answer/ Hint      

Answer : C

Explanation :

34.

Sour taste of  ‘Coca Cola’  is due to the presence of

Answer/ Hint      

Answer : B

Explanation :

35.

Bhopal gas tragedy is associated with leakage of

Answer/ Hint      

Answer : D

Explanation :

36.

Iodized salt is beneficial for

Answer/ Hint      

Answer : C

Explanation :

37.

The acid rain destroys vegetations because it contains

Answer/ Hint      

Answer : D

Explanation :

38.

The substance most commonly used as a food preservative is

Answer/ Hint      

Answer : D

Explanation :

39.

Which of the following gases is most toxic  ?

Answer/ Hint      

Answer : B

Explanation :

40.

‘Plaster of Paris’  is made by partial dehydration of

Answer/ Hint      

Answer : B

Explanation :

41.

By-product obtained by soap-industry is

Answer/ Hint      

Answer : B

Explanation :

42.

For determination of the age of which among the following is carbon dating method used ?

Answer/ Hint      

Answer : D

Explanation :

43.

When conc. H2SO4  is added to dry  KNO3,  brown fumes are evolved. These fumes are due to

Answer/ Hint      

Answer : C

Explanation :

44.

Which of the following chemicals is used in photography  ?

Answer/ Hint      

Answer : B

Explanation :

45.

Which of the following is extensively used for sterilizing water  ?

Answer/ Hint      

Answer : A

Explanation :

46.

Cream gets separated out of milk when it is churned. This is due to

Answer/ Hint      

Answer : C

Explanation :

47.

The chemical name of  ‘Common salt’  is

Answer/ Hint      

Answer : A

Explanation :

48.

Detergents clean surfaces on the principle of

Answer/ Hint      

Answer : B

Explanation :

49.

Ammonal is a mixture of

Answer/ Hint      

Answer : A

Explanation :

50.

What are the major pollutants of cigarette smoke  ?

Answer/ Hint      

Answer : B

Explanation :

51.

Zinc sulphide is commonly used as

Answer/ Hint      

Answer : C

Explanation :

52.

The purest form of water is

Answer/ Hint      

Answer : B

Explanation :

53.

Mortar is a mixture of water, sand and

Answer/ Hint      

Answer : A

Explanation :

54.

Silver halides are used in photographic plates because they are

Answer/ Hint      

Answer : C

Explanation :

55.

The chemical(s) most commonly used for cloud seeding or  ‘artificial rainmaking’  is/are

Answer/ Hint      

Answer : A

Explanation :

56.

Dry powder fire extinguishers contain

Answer/ Hint      

Answer : D

Explanation :

57.

Which type of glass is used for making glass reinforced plastic  ?

Answer/ Hint      

Answer : D

Explanation :

58.

The constituents of automobile exhaust that can cause cancer is/are  :

Answer/ Hint      

Answer : D

Explanation :

59.

For generation of biogas, the materials commonly used are

Answer/ Hint      

Answer : A

Explanation :

60.

Raw materials used for the manufacture of glass are

Answer/ Hint      

Answer : A

Explanation :

61.

The  BOD  values of water indicate the

Answer/ Hint      

Answer : B

Explanation :

62.

Setting of plaster of parts involves

Answer/ Hint      

Answer : B

Explanation :

63.

The common name for the compound having formal  NaOH  is

Answer/ Hint      

Answer : A

Explanation :

64.

Which one of the following is found in kidney stones  ?

Answer/ Hint      

Answer : B

Explanation :

65.

Bone ash contains

Answer/ Hint      

Answer : C

Explanation :

66.

Acid secretion is characteristic of

Answer/ Hint      

Answer : B

Explanation :

67.

Which one of the following is not a fertilizer  ?

Answer/ Hint      

Answer : B

Explanation :

68.

A potato tuber has been cut into two halves. A few drops of iodine solution are placed on the cut surface of one of the halves. What colour change will be noticed  ?

Answer/ Hint      

Answer : A

Explanation :

69.

Epsom salt is used

Answer/ Hint      

Answer : A

Explanation :

70.

The chemical name of rat poison is

Answer/ Hint      

Answer : D

Explanation :

71.

Silver nitrate solution is kept in brown bottles in laboratory because

Answer/ Hint      

Answer : B

Explanation :

72.

Gold dissolves in

Answer/ Hint      

Answer : C

Explanation :

73.

The element used in the manufacture of safety matches is

Answer/ Hint      

Answer : A

Explanation :

74.

When lime juice is dropped on baking soda, brisk effervescence takes place because the gas evolved is

Answer/ Hint      

Answer : C

Explanation :

75.

pH  value between  6.5-7.5  makes the soil

Answer/ Hint      

Answer : D

Explanation :

76.

When quick lime is added to water

Answer/ Hint      

Answer : A

Explanation :

77.

This group of aluminosilicate minerals is widely used in making electrical insulators

Answer/ Hint      

Answer : D

Explanation :

78.

The acid which is secreted by the glands in the stomach wall is

Answer/ Hint      

Answer : B

Explanation :

79.

Dry ice is

Answer/ Hint      

Answer : D

Explanation :

80.

Cement containing excess amount of lime

Answer/ Hint      

Answer : A

Explanation :

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