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Q:

Which among the following is white phosphorus?

A) P1 B) P6
C) P4 D) P5
 
Answer & Explanation Answer: C) P4

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Q:

In arc welding, Argon is used because of its

A) Low reactivity with metal B) Ability to lower the melting point of the metal
C) High flammability D) High calorific value
 
Answer & Explanation Answer: A) Low reactivity with metal

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Q:

Removal of carbon particles from air involves the principle of

A) Precipitation B) Filteration
C) Electrophoresis D) Sedimentation
 
Answer & Explanation Answer: C) Electrophoresis

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Q:

Release of which among the following is the primary reason for depletion of the ozone layer?

A) Nitrous oxide B) Hydrogen dioxide
C) Chlorofluro carbon D) Carbon monoxide
 
Answer & Explanation Answer: C) Chlorofluro carbon

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Q:

What is the chemical formula for Sodium Chloride (Salt)?

A) NaCl2 B) NaCl
C) Na2Cl D) Na2C
 
Answer & Explanation Answer: B) NaCl

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Q:

The absolute zero is a temperature at which _______

A) molecular motion in a gas would cease B) water freezes
C) all gases become liquid D) all gases become solid
 
Answer & Explanation Answer: A) molecular motion in a gas would cease

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Q:

An element A forms an oxide with formula A3O4. What is the valency of element A?

A) 3 B) 2
C) 1 D) 4
 
Answer & Explanation Answer: D) 4

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Q:

Besides CO2, the other green house gas is

A) CH4 B) N2
C) Ar D) O2
 
Answer & Explanation Answer: A) CH4

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