general science

Chemistry MCQ Questions and Answers page - 3

1.

Which one of the following metals does not react with water to produce Hydrogen ?

Answer/ Hint      

Answer : B

Explanation :

2.

Ozone consists of

Answer/ Hint      

Answer : A

Explanation :

3.

An atomic clock is based on transitions in

Answer/ Hint      

Answer : B

Explanation :

4.

The material used in the manufacture of lead pencil is

Answer/ Hint      

Answer : A

Explanation :

5.

If all bullets could not be removed from gun shot injury of a man, it may cause poisoning by

Answer/ Hint      

Answer : B

Explanation :

6.

The noble gas used in radiotherapy is

Answer/ Hint      

Answer : C

Explanation :

7.

White phosphorus is always kept under

Answer/ Hint      

Answer : D

Explanation :

8.

Galena is a mineral of

Answer/ Hint      

Answer : C

Explanation :

9.

Magnesium is an alloy of

Answer/ Hint      

Answer : A

Explanation :

10.

Two elements which are used to absorb neutrons to control thr chain reaction during nuclear fission are

Answer/ Hint      

Answer : A

Explanation :

11.

Supersonic jet causes pollution by thinning of

Answer : A

Explanation :

12.

Which of the following metals causes Itai-Itai disease ?

Answer/ Hint      

Answer : A

Explanation :

13.

Which one of the following minerals is found in monazite sand ?

Answer/ Hint      

Answer : C

Explanation :

14.

Now-a-says yellow lamps are frequently used as street lights. Which of the following gases is used in these lamps ?

Answer/ Hint      

Answer : A

Explanation :

15.

Which of the following could be used as fuel in propellant or rockets ?

Answer/ Hint      

Answer : D

Explanation :

16.

Hard steel contains

Answer/ Hint      

Answer : B

Explanation :

17.

Cement is formed by strongly heating a mixture of

Answer/ Hint      

Answer : B

Explanation :

18.

Glass is a

Answer/ Hint      

Answer : B

Explanation :

19.

A Balloon filled with helium rises in air because

Answer/ Hint      

Answer : C

Explanation :

20.

Which of the toxic heavy metals is found in modern tannery industries ?

Answer/ Hint      

Answer : C

Explanation :

21.

Which of the following contains high content of lead ?

Answer/ Hint      

Answer : C

Explanation :

22.

Stainless steel is an alloy of

Answer/ Hint      

Answer : B

Explanation :

23.

Which of the following is used in welding broken pieces of iron rails and machine parts ?

Answer/ Hint      

Answer : C

Explanation :

24.

The metals commonly used for electroplating are

Answer/ Hint      

Answer : B

Explanation :

25.

Which of the following in automobile exhaust can cause cancer ?

Answer/ Hint      

Answer : D

Explanation :

26.

Electric bulbs are filled with :

Answer/ Hint      

Answer : C

Explanation :

27.

The purest form of Iron is :

Answer/ Hint      

Answer : D

Explanation :

28.

The gas that is used in the manufacture of Vanaspati ghee is :

Answer/ Hint      

Answer : C

Explanation :

29.

An example of semiconductor is

Answer/ Hint      

Answer : B

Explanation :

30.

Sea weeds are important source of

Answer/ Hint      

Answer : D

Explanation :

31.

Slag is a name given for

Answer/ Hint      

Answer : C

Explanation :

32.

Which one of the following gases has the highest calorific value ?

Answer/ Hint      

Answer : D

Explanation :

33.

Which one of the following minerals is found in pure form ?

Answer/ Hint      

Answer : B

Explanation :

34.

Among the fuels given below, the one with highest calorific value is

Answer/ Hint      

Answer : D

Explanation :

35.

Coal is formed from

Answer/ Hint      

Answer : D

Explanation :

36.

Colour imparted to the Bunsen flame by strontium salt is

Answer/ Hint      

Answer : D

Explanation :

37.

The chemical name of “laughing gas” is

Answer/ Hint      

Answer : D

Explanation :

38.

Brass is an alloy of

Answer/ Hint      

Answer : B

Explanation :

39.

Which one of the following pairs is NOT correctly matched ?

Answer/ Hint      

Answer : A

Explanation :

40.

The charcoal used to decolourise brown sugar solution is

Answer/ Hint      

Answer : C

Explanation :

41.

Which one of the following is used for dating very old objects of archaeological importance ?

Answer/ Hint      

Answer : D

Explanation :

42.

Chemically ‘Quick Silver’ is known as

Answer/ Hint      

Answer : A

Explanation :

43.

Which of the following gases is mixed with oxygen for breathing by divers in aqualungs ?

Answer/ Hint      

Answer : B

Explanation :

44.

Among the following which is always found in free-state in nature ?

Answer/ Hint      

Answer : A

Explanation :

45.

Hardest allotrope of carbon is

Answer/ Hint      

Answer : A

Explanation :

46.

Which metal does not undergo corrosion due to the formation of oxide layer ?

Answer/ Hint      

Answer : C

Explanation :

47.

Solder is an alloy of

Answer/ Hint      

Answer : C

Explanation :

48.

Name two elements that find wide application in transistor industry

Answer/ Hint      

Answer : A

Explanation :

49.

An inert gas mixed with oxygen given to patients suffering from restricted breathing is

Answer/ Hint      

Answer : A

Explanation :

50.

An example of major air pollutant is

Answer/ Hint      

Answer : B

Explanation :

51.

Among the following the hardest metal is

Answer/ Hint      

Answer : D

Explanation :

52.

The material used in solar cells contains

Answer/ Hint      

Answer : B

Explanation :

53.

Which one of the following elements is least likely to be found in commercial fertilisers ?

Answer/ Hint      

Answer : D

Explanation :

54.

The wire of flash bulb is made of :

Answer/ Hint      

Answer : C

Explanation :

55.

The coloured discharge tubes for advertisement mainly contain

Answer/ Hint      

Answer : D

Explanation :

56.

What is the most common salt in sea water ?

Answer/ Hint      

Answer : C

Explanation :

57.

Which one of the following is a renewable source of energy ?

Answer/ Hint      

Answer : B

Explanation :

58.

Which one of the following is a micro-element ?

Answer/ Hint      

Answer : A

Explanation :

59.

Rock salt is a mineral containing

Answer/ Hint      

Answer : C

Explanation :

60.

Which one of the following metals occurs in free state ?

Answer/ Hint      

Answer : A

Explanation :

61.

Copper is refined by

Answer/ Hint      

Answer : A

Explanation :

62.

The element with highest first ionisation energy is

Answer/ Hint      

Answer : B

Explanation :

63.

Carbon dioxide is

Answer/ Hint      

Answer : A

Explanation :

64.

Seaweeds are important source of

Answer/ Hint      

Answer : D

Explanation :

65.

The resources which can be used continuously, year-after-year are called

Answer/ Hint      

Answer : D

Explanation :

66.

When Hydrogen starts burning in air, it produces ?

Answer/ Hint      

Answer : B

Explanation :

67.

Mercury is a :

Answer/ Hint      

Answer : B

Explanation :

68.

Which gas is used for converting vegetable oils into saturated fats ?

Answer/ Hint      

Answer : A

Explanation :

69.

Iodine can be separated from a mixture of Iodine and Potassium Chloride by

Answer/ Hint      

Answer : C

Explanation :

70.

Identify the metal which is non toxic in nature.

Answer/ Hint      

Answer : B

Explanation :

71.

The most reactive among the halogens is

Answer/ Hint      

Answer : A

Explanation :

72.

Which one of the inert gases can form compounds ?

Answer/ Hint      

Answer : B

Explanation :

73.

Which one of the following element is used in the manufacture of fertilizers ?

Answer/ Hint      

Answer : B

Explanation :

74.

In addition to hydrogen, the other abundant element present on Sun’s surface is

Answer/ Hint      

Answer : A

Explanation :

75.

Ozone layer is present in

Answer/ Hint      

Answer : C

Explanation :

76.

An electric iron has a heating element made of :

Answer/ Hint      

Answer : C

Explanation :

77.

Which one of the following is not a method of preparing oxygen ?

Answer/ Hint      

Answer : D

Explanation :

78.

Which one of the following is not a characteristic feature of alloys ?

Answer/ Hint      

Answer : A

Explanation :

79.

Find the odd one :

Answer/ Hint      

Answer : D

Explanation :

80.

Maximum permissible concentration of copper in drinking water in mg/L is

Answer/ Hint      

Answer : C

Explanation :

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