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
Fluorine
Bromine

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General Science
The dark lines in the solar spectrum are due to

Absorption of corresponding wavelengths by the prism used in the photograph.
Absorption of corresponding wavelengths by the outer layers of the sun.
Destructive interference between waves of certain definite wavelengths.
Absence of corresponding wavelengths from the light emitted by the core of the sun.

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