set 2 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) A sample of air increases in volume when heated at constant pressure but mass remains unchanged
(b) When 12 gm of carbon is heated in vacuum, there is no change in mass
(c) Weight of platinum wire is the same before and after heating
(d) 12 gm of carbon combines with 32 gm of oxygen to give 44 gm of carbondioxide.
The correct answers to the above question in:
Answer: (b)
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Read more nature of matter and composition Based General Science Questions and Answers
Question : 1
The chemical name of 'Marsh gas' is
a) Propane
b) Ethene
c) Methane
d) Hexane
Answer »Answer: (c)
Question : 2
Select the one that is a physical change.
a) Rusting of iron
b) Growth of plant
c) Digestion of food
d) None of these
Answer »Answer: (d)
Each of the process given in options are irreversible and involve change in chemical properties hence all are chemical changes.
Question : 3
The boiling point of alcohol is 78°C. What is this temperature in Kelvin scale
a) 375 K
b) 373 K
c) 351 K
d) 78 K
Answer »Answer: (c)
Question : 4
A change is said to be a chemical change when
a) it is accompanied by change in physical properties
b) it is accompanied by formation of new substances
c) it is accompanied by energy change
d) All the above are correct
Answer »Answer: (d)
Question : 5
On passing through a colloidal solution, the beam of light gets ..........
a) scattered
b) refracted
c) reflected
d) absorbed
Answer »Answer: (a)
This is due to Tyndall effect.
Question : 6
Which of the following statements is true about a colloidal system?
a) It can be made out of two gases
b) It consists of one phase only
c) It carries a net electric charge
d) It is electrically neutral as a whole
Answer »Answer: (d)
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