alloys, carbon & its various forms, hydrogen & compounds, sulphur, nitrogen, halogen & inert gases - Category wise Question and Answer Practice Test with Solutions

Question : 21 [PSC (Pre) 2019]

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

Question : 22 [UPPCS (Mains) 2013]

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

a) Reverse osmosis

b) Electric separation

c) Deliquescence

d) Efflorescence

Question : 23 [MPPCS (Pre) 2006]

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

a) 18-20%

b) 40-42%

c) 10-11%

d) 78-79%

Question : 24 [PSC (Pre) 2019]

Statement (A):
Galvanized iron does not rust.
Statement (R):
Zinc has the efficiency of oxidation.

a) (A) is false, but (R) is true

b) (A) is true, but (R) is false

c) Both (A) and (R) are true and (R) is the correct explanation of (A)

d) Both (A) and (R) are true, but (R) is not the correct explanation of (A)

Question : 25 [PCS (Pre) 2016]

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