Top 500+ TRB Chemistry Model Question Paper with Answers - 1

Question: 1

Efficiency of the catalysts depends on its

(A) Number of free valencies

(B) Molecule state

(C) Amount used

(D) Physical state

Ans: B

Molecule state

Question: 2

Hardness of water is due to the presence of soluble salts in

(A) Sodium and Calcium

(B) Sodium and Lead

(C) Sodium and Magnesium

(D) Calcium and Magnesium

Ans: D

Calcium and Magnesium

Question: 3

An example for substances that undergo physical change is

(A) Burning of paper

(B) Rusting of iron

(C) Burning of coal

(D) Evaporation of water

Ans: D

Evaporation of water

Question: 4

The pH of lemon juice is

(A) 1.0 - 3.0

(B) 2.2 - 2.4

(C) 4.5 - 5.5

(D) 6.5 - 7.5

Ans: B

2.2 - 2.4

Question: 5

An example for chemical change is

(A) Boiling of water of naphthalene

(B) Change of milk into curd

(C) Melting of ice

(D) Evaporation of water

Ans: B

Change of milk into curd

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