set 2 MCQ Questions & Answers Detailed Explanation

Question : 1

Which of the following is made up of Carbon only?

a) Spider silk

b) Kevlar

c) Lexan

d) Graphene

Question : 2

Helium is preferred to Hydrogen in air balloons because it

a) Is less dense

b) Has greater lifting power

c) Is cheaper

d) Does not form an explosive mixture with air

Question : 3

Which is used as Laughing gas?

a) Nitrogen dioxide

b) Nitrogen trioxide

c) Nitrous oxide

d) Nitrogen tetra oxide

Question : 4

Which of the following remains in a solid state at normal temperature?

a) Bromine

b) Iodine

c) Chlorine

d) Fluorine

Question : 5

Mercury metal mixture is

a) Highly resisting alloy for malfriction

b) Mercury mixed alloy

c) High colour alloy

d) Carbon mixed alloy

Question : 6

The pH value for water is

a) 8.7 or more

b) 5 or less than 5

c) Nearly zero

d) Nearly 7