The earth’s atmosphere is an envelope of gases present upto a height of about ______________ kms?

Related Mcqs:

Workers working in _______________ industry are most prone to white lung cancer?

A. Coal mining B. Limestone mining C. Textile D. Asbestos...

Presence of iron and manganese in water causes___________________?

A. Reduction in its dissolved oxygen content B. Discoloration of bathroom fixtures C. Temporary hardness D. None of these...

The destruction of water-borne pathogens is termed as disinfection of water. Which of the following is a water disinfectant ?

A. Chlorine B. Alkalis C. Benzene hexachloride D. Alkyl benzene sulphonate (ABS)...

Acute danger to human life (i.e. death) exists, if the concentration of CO2 in atmospheric air exceeds ______________ percent (by volume)?

A. 1 B. 3 C. 7 D. 20...

TLV of aldrin in public water supply system is about ____________ μg/litre?

A. 0.5 B. 17 C. 357 D. 1097...