set 3 MCQ Questions & Answers Detailed Explanation

Question : 1

The number of neutrons in ₇Al²⁷ is

a) 14

b) 27

c) 40

d) 13

Question : 2

Which of the following isotopes of carbon is/are used in carbon dating?

a) ₆ C¹⁴ only

b) ₆ C¹³ only

c) ₆ C¹² only

d) ₆ C¹² and ₆ C¹⁴

Question : 3

Valency of Cr in CrP$O_4$ is

a) 2

b) 3

c) 4

d) 1

Question : 4

Radioactivity is measured by

a) Geiger Counter

b) Seismometer

c) Hydrometer

d) Ammeter

Question : 5

Dalton's atomic theory successfully explained

1. Law of conservation of mass
2. Law of constant composition
3. Law of radioactivity
4. Law of multiple proportions

a) (i), (iii) and (iv)

b) (ii), (iii) and (iv)

c) (i), (ii) and (iii)

d) (i), (ii) and (iv)

Question : 6

What is the weight of one atom of Hydrogen in grams?

a) 6.62 × 10^–24

b) 1.66 × 10^–24

c) 6.023 × 10^–23

d) None of these