set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

Which pair of following is of Copper alloys?

a) None of the above

b) Brass and Bronze

c) Brass and invar

d) Bronze and Nichrome

Question : 2

Discharge of Nitrogen causes

a) Increase in the amount of Nitrogen in lithosphere

b) The amount of Nitrogen in lithosphere and in atmosphere unchanged

c) Increase in the amount of atmospheric nitrogen

d) Destruction of nitrates bacteria

Question : 3

The halogen being used as analgesic is

a) Bromine

b) Iodine

c) Chlorine

d) Fluorine

Question : 4

What is the approximate percentage of Nitrogen present in the atmosphere?

a) 18-20%

b) 40-42%

c) 10-11%

d) 78-79%

Question : 5

The process used for transforming salty water into pure water is called

a) Reverse osmosis

b) Electric separation

c) Deliquescence

d) Efflorescence

Question : 6

To make the steel hard requires increase in

a) The quantity of Chromium

b) The quantity of Silicon

c) The quantity of Carbon

d) The quantity of Manganese