Chemistry mcq questions and answers for competitive exams

Posted on Jun 9, 2022 10:12 PM - 2 years ago

Chemistry mcq questions and answers for competitive exams UPSC SSC , SSC CGL, SSC CHSL, upsc Civils , Entrance exams Online test practice online free Quiz, mock practice online

61.

What is extracted from Bauxite?

Tin

Mica

Copper

Aluminium

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62.

Which is used in preparation of dynamite?

glycol

glycerol

ethyl alcohol

methyl alcohol

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63.

The heat energy produced when the human body metabolises 1 gram of fat is

1 KJ

29 KJ

30 KJ

39 KJ

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64.

Acid rain is due to air pollution by?

Methane

Carbon dioxide

Carbon monoxide

Nitrous oxide and Sulphur dioxide

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65.

Which have the maximum density?

Ice

Water

Benzene

Chloroform

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66.

The graphite rods in the nuclear reactor

produce neutrons

react with U to release energy

convert fast moving neutrons into thermal neutrons

undergo combustion which triggers the nuclear fission

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67.

The nucleus of a hydrogen atom consists of

1 proton only

1 neutron only

1 electron only

1 proton + 2 neutron

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68.

The oil used in the froth floatation process is

pine oil

olive oil

coconut oil

kerosene oil

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69.

Which acid is present in lemon?

citric acid

lactic acid

marlic acid

tartaric acid

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Chemistry mcq questions and answers for competitive exams