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) its volume changes under different conditions
(b) its temperature may change
(c) its pressure may very
(d) its composition may vary
The correct answers to the above question in:
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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Question : 1
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 : 2
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 : 3
Which of the following is an example of a heterogeneous substance?
a) Pieces of copper
b) Table salt
c) Bottled water
d) Candle
Answer »Answer: (d)
Candle is a heterogeneous mixture of wax and thread. Copper is element while bottled water and table salt are compounds.
Question : 4
The compound used as 'artificial sweetener' is
a) citric acid
b) Saccharine
c) Tartaric acid
d) octane
Answer »Answer: (b)
Question : 5
Physical properties of a mixture
a) depend on the organization of the substance
b) depend on the volume of the substance
c) vary with the amount of substance.
d) vary depending upon its components
Answer »Answer: (d)
Physical properties of mixtures are same as of its components.
Question : 6
Salt can be obtained from sea water by
a) evaporation
b) decantation
c) filtration
d) sublimation
Answer »Answer: (a)
Sea water is a solution of salt and water.
During evaporation, water gets evaporated off and salt is left as a residue.
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