set 2 MCQ Questions & Answers Detailed Explanation

Question : 1

The difference between a nuclear reactor and atomic bomb is that

a) the chain reaction in nuclear reactor is not controlled.

b) no chain reaction takes place in nuclear reactor while in the atomic bomb there is a chain reaction.

c) the chain reaction in nuclear reactor is controlled.

d) no chain reaction takes place in atomic bomb while it takes place in nuclear reactor.

Question : 2

Which of these choices is not a family of elements?

a) Metals

b) Inert gases

c) Halogens

d) All of these

Question : 3

Which one of the following is not a periodic property i.e., does not show any trend on moving from one side to the other in the periodic table?

a) Valency

b) Radioactivity

c) Atomic size

d) Electronegativity

Question : 4

Consider the following statements :

1. 22gm. of $CO_2$ consist of 1 mole.
2. Number of molecules in 4 gm of oxygen is $10^22$.
3. Mass of 1 mole of a substance is called its formula mass.

a) 1 and 3

b) 1 and 2

c) 2 and 3

d) 1, 2 and 3

Question : 5

Which of the following is an actinide?

a) Polonium

b) Promethium

c) Plutonium

d) Palladium

Question : 6

The number of elements in the third period of periodic table is

a) 8

b) 18

c) 2

d) 32