set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

Of how many carats is the pure gold?

a) 24

b) 28

c) 22

d) 20

Question : 2

Cinnabar is an ore of

a) Pb

b) Hg

c) Cu

d) Zn

Question : 3

Silicon is used in –

a) Transistors

b) Solar energy devices

c) Semiconductors

d) All of these

Question : 4

What is the colour of oxygen in solid state ?

a) Pale blue

b) Light green

c) Pale yellow

d) Greenish yellow

Question : 5

Which reducing agent is used in chemical reduction?

a) Al

b) C

c) CO

d) All of these

Question : 6

Mica is a

a) Bad conductor of both heat and electricity

b) Good conductor of heat and electricity both

c) Good conductor of heat and bad conductor of electricity

d) Bad conductor of heat and good conductor of electricity