TRB Old Question Papers for Chemistry - 4

Question: 16

Which one among the following is the heaviest?

(A) 1 mole of water molecules

(B) 1 mole of ammonia molecules

(C) 1 mole of hydrogen molecules

(D) 1 mole of sodium atoms

Question: 17

Name the steel alloy used in rock crushing machinery

(A) Cobalt steel

(B) Silicon steel

(C) Manganese steel

(D) Nickel steel

Question: 18

The metal compound commonly found in Sindhoor or Kumkum is based on

(A) Tin

(B) Zinc

(C) Copper

(D) Lead

Question: 19

Air is

(A) Mixture

(B) Element

(C) Solution

(D) Compound

Question: 20

What is the ratio of cement and sand required in mortar?

(A) 1:3

(B) 2:3

(C) 3:2

(D) 3:1