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821. Air-pockets that cause aircrafts to lose altitude suddenly are caused by

A. dense cloud cover

B. poor visibility

C. temperature inversions

D. intense low pressure in valleys that suck in air

Explanation:

822. The Electric Lamp was discovered by

A. Ford

B. Marconi

C. Edison

D. None of these

Explanation:

823. A substance which can act both as an acid and a base is known as :

A. amorphous

B. allotropic

C. amphoteric

D. none of these

Explanation:

824. The gas that usually causes explosions in coal mines is

A. hydrogen

B. carbon monoxide

C. air

D. methane

Explanation:

825. What is laughing gas /

A. Carbon dioxide

B. Sulphur dioxide

C. Hydrogne peroxide

D. Nitrous oxide

Explanation:

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