set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

Silicon is used in –

a) Transistors

b) Solar energy devices

c) Semiconductors

d) All of these

Question : 2

Which one of the following is the hardest metal?

a) Iron

b) Platinum

c) Gold

d) Tungsten

Question : 3

Which one of the following metals is accessed in the native state?

a) Gold

b) Chromium

c) Aluminium

d) Zinc

Question : 4

Of how many carats is the pure gold?

a) 24

b) 28

c) 22

d) 20

Question : 5

Which of the following do not react with water at all?

a) Lead

b) Magnesium

c) Iron

d) None of the above

Question : 6

What is the colour of oxygen in solid state ?

a) Pale blue

b) Light green

c) Pale yellow

d) Greenish yellow