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Chemistry

Chemistry
The number of hydrogen bonds between guanine and cytosine in DNA is

3
2
4
1

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Chemistry
Persons working in cement plants and lime stone quarries are prone to disease like

Cancer
Silicosis
Asthma
Pneumoconiosis

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

Solder
None of these
Aluminium sulphate
Aluminium powder

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Chemistry
In vulcanisation process, rubber can be hardened by adding

Nitrogen
Alcohol
Sulphur
Silicon

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Chemistry
Ultraviolet rays can be used in water treatment as

Disinfectant
Precipitator
Hydrolyser
Flocculator

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Chemistry
Periodic table contains how many periods

8
10
6
7

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