set 3 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) Pieces of copper
(b) Table salt
(c) Bottled water
(d) Candle
The correct answers to the above question in:
Answer: (d)
Candle is a heterogeneous mixture of wax and thread. Copper is element while bottled water and table salt are compounds.
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Read more nature of matter and composition Based General Science Questions and Answers
Question : 1
In which of the following the constituents are present in any ratio?
a) Solution
b) Compound
c) Mixture
d) Colloid
Answer »Answer: (c)
Question : 2
Which one of the following mixtures is homogeneous?
a) Graphite and charcoal
b) Starch and sugar
c) Methanol and water
d) Calcium carbonate and calcium bicarbonate
Answer »Answer: (c)
Question : 3
Normal solution is :
a) one litre containing one equivalent
b) acidic solution
c) inert solution
d) basic solution
Answer »Answer: (a)
The solution which has one gram equivalent in one litre is called normal solution.
Question : 4
Which of the following is a compound ?
a) Graphite
b) Bronze
c) Stainless steel
d) Hydrogen sulphide
Answer »Answer: (d)
Hydrogen sulphide (H2 S) is a compound of hydrogen and sulphur.
Stainless steel and bronze are alloys whereas graphite is an allotropic form of the element carbon.
Question : 5
Iodised salt is a
a) compound formed by combination of potassium iodide and common salt
b) mixture of potassium iodide and common salt
c) mixture of molecular iodide and common salt
d) compound formed by molecular iodine and common salt
Answer »Answer: (a)
Question : 6
Air is regarded as a mixture because
a) its volume changes under different conditions
b) its temperature may change
c) its pressure may very
d) its composition may vary
Answer »Answer: (d)
Air is a mixture of different gases like N2 , O2 , CO2 etc.
Its general composition is N2 = 78%, O2 = 21% and
traces of a few other gases but there may be variation in its composition from place to place and at different heights.
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