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Q:

Calcium salts used as fertilizer is:

A) Calcium Carbide B) Calcium Carbonate
C) Calcium Cyanide D) Calcium Sulphate
 
Answer & Explanation Answer: D) Calcium Sulphate

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Q:

When Granite rocks get metamorphosed, they form

A) Quartzite B) Gneiss
C) Marble D) Slate
 
Answer & Explanation Answer: B) Gneiss

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Q:

Why is argon gas used along with tungsten wire in an electric bulb?

A) To increase the life of the bulb B) To reduce the consumption of electricity
C) To make the emitted light colored D) To reduce the cost of the bulb
 
Answer & Explanation Answer: A) To increase the life of the bulb

Explanation:

Argon gas is used in fluorescent and incandescent light bulbs to stop the oxygen in the light bulbs from corroding the hot tungsten filament.

The use of argon in light bulbs prevents the evaporation of the tungsten filaments, which results in increased light bulb life.

Argon is also used to create an inert atmosphere for growing semiconductor crystals, arc welding and for processes that need protection from other kinds of atmospheric gases.

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Q:

The most extensive use of molasses after fermentation is for producing

A) Methanol B) Sugar
C) Ethanol D) Sugarcane
 
Answer & Explanation Answer: C) Ethanol

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Q:

The main mineral constituents of the continental mass are ________ and alumina.

A) iron oxide B) silica
C) water D) oxygen
 
Answer & Explanation Answer: B) silica

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Q:

Which of the following is not an example of Allotrope?

A) Diamond B) Graphite
C) Ozone D) Steel
 
Answer & Explanation Answer: D) Steel

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1 1034
Q:

A change in which a substance undergoes a change in its physical properties is called _____________.

A) Chemical Properties B) Physical Properties
C) Chemical Change D) Physical Change
 
Answer & Explanation Answer: D) Physical Change

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Q:

In a compound the elements are always present in definite proportions by ______

A) mass B) volume
C) size D) No option is correct
 
Answer & Explanation Answer: A) mass

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