set 2 MCQ Questions & Answers Detailed Explanation

Question : 1

Which one of the following is heavy water used in nuclear reactor?

a) Water at 4°C but having molecular weight 19 u

b) Water having molecular weight 20 u

c) Water having molecular weight 18 u

d) Water below the ice in a frozen sea

Question : 2

Which one of the following reactions is the main cause of the energy radiation from the Sun?

a) Chemical reaction

b) Fission reaction

c) Fusion reaction

d) Diffusion reaction

Question : 3

Which of the following has a charge of +1 and a mass of 1 amu ?

a) A proton

b) An electron

c) A neutron

d) A helium nucleus

Question : 4

Which of the following pairs is/are correctly matched?

1. Isotopes : Atoms with same atomic number but different atomic mass
2. Isobars : Atoms with same number of neutrons but different atomic number
3. Isotones : Atoms with same mass number but different atomic number

a) 1 and 2 only

b) 1 only

c) 1, 2 and 3

d) 2 only

Question : 5

Which of the following pairs are isotopes?

a) Ice and steam

b) Nitric oxide and nitrogen dioxide

c) Oxygen and ozone

d) Hydrogen and deuterium

Question : 6

The atomic weights are expressed in terms of atomic mass unit. Which one of the following is used as a standard?

a) ¹²C₆

b) ¹⁶O₈

c) ¹H₁

d) ³⁵Cl₁₇