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General Science

General Science
The percentage of oxygen present in air is approximately-

0.21
0.23
0.44
0.4

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General Science
The tree sends down roots from its branches to the soil is know as

Palm
Oak
Pine
Banyan

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General Science
The chemical (Ethyl Mercaptan) added to the otherwise odourless LPG cooking gas for imparting a detectable smell to the gas is a compound of

Sulphur
Chlorine
Bromine
Fluorine

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General Science
A chronometer measures:

Colour contrast
Time
Water waves
Sound waves

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General Science
Actinides are the elements with atomic numbers from

97 to 104
101 to 115
36 from 43
89 to 103

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General Science
Carbon, diamond and graphite are together called

Isomorphs
Isomers
Isotopes
Allotrope

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