set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

Which of the following processes is known as fusion?

a) change of liquid to vapour

b) change of liquid to solid

c) change of solid to liquid

d) change of gaseous state to solid state

Question : 2

A gas can be compressed to a fraction of its volume. The same volume of a gas can be spread all over a room. The reason for this is that

a) gases consist of molecules having very large intermolecular space which can be reduced or increased under ordinary conditions

b) the volume occupied by molecules of a gas is negligible as compared to the total volume of the gas.

c) gases consists of molecules which are in a state of random motion

d) None of these

Question : 3

Which one of the following petroleum refinary products has the lowest boiling point?

a) Gasoline

b) Kerosene

c) Diesel

d) Lubricating oil

Question : 4

Aqua-regia used by alchemists to separate silver and gold is a mixture of

a) nitric acid (concentrated) and sulphuric acid (concentrated)

b) hydrochloric acid (concentrated) and nitric acid (concentrated)

c) hydrochloric acid (concentrated) and sulphuric acid (concentrated)

d) hydrochloric acid (dilute) and sulphuric acid (dilute)

Question : 5

What happens when a fixed amount of oxygen gas is taken in a cylinder and compressed at constant temperature?

1. Number of collisions of oxygen molecules at per unit area of the wall of the cylinder increase.
2. Oxygen ($O_2$) gets converted into ozone ($O_3$).
3. Kinetic energy of the molecules of oxygen gas increases.

a) C only

b) A and C

c) B and C

d) A only

Question : 6

The main constituent of vinegar is

a) Citric acid

b) Acetic acid

c) Ascorbic acid

d) Tartaric acid