set 1 MCQ Questions & Answers Detailed Explanation
MOST IMPORTANT general science mcq - 3 EXERCISES
The following question based on nature of matter and composition topic of general science mcq
(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
The correct answers to the above question in:
Answer: (c)
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Read more nature of matter and composition Based General Science Questions and Answers
Question : 1
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
Answer »Answer: (a)
Question : 2
Which one of the following petroleum refinary products has the lowest boiling point?
a) Gasoline
b) Kerosene
c) Diesel
d) Lubricating oil
Answer »Answer: (a)
Question : 3
The chemical technique applied to find out age of fossils is knows as
a) Photosynthesis
b) Carbon dating
c) Nuclear fusion
d) Fermentation
Answer »Answer: (b)
Question : 4
Cloud or fog is an example of colloidal system of
a) solid dispersed in gas
b) gas dispersed in gas
c) liquid dispersed in gas
d) solid dispersed in liquid
Answer »Answer: (c)
Fog is a colloidal system consisting water droplets dispersed in air.
Question : 5
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)
Answer »Answer: (b)
Question : 6
What happens when a fixed amount of oxygen gas is taken in a cylinder and compressed at constant temperature?
- Number of collisions of oxygen molecules at per unit area of the wall of the cylinder increase.
- Oxygen ($O_2$) gets converted into ozone ($O_3$).
- Kinetic energy of the molecules of oxygen gas increases.
a) C only
b) A and C
c) B and C
d) A only
Answer »Answer: (d)
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