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) Rusting of iron
(b) Growth of plant
(c) Digestion of food
(d) None of these
The correct answers to the above question in:
Answer: (d)
Each of the process given in options are irreversible and involve change in chemical properties hence all are chemical changes.
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Read more nature of matter and composition Based General Science Questions and Answers
Question : 1
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 : 2
Match the following columns ?
Column I (Fuel Gas) | Column II (Major constituent) |
A. CNG | 1. Carbon monoxide, hydrogen |
B. Coal gas | 2. Butane, propene |
C. LPG | 3. Methane, ethane |
D. Water gas | 4. Hydrogen, methane, carbon monoxide |
a) A - 3, B - 4, C - 2, D - 1
b) A - 2, B - 1, C - 3, D - 4
c) A - 2, B - 4, C - 3, D - 1
d) A - 3, B - 1, C - 2, D – 4
Answer »Answer: (a)
Question : 3
Filtration can be used to separate
a) liquids from liquids
b) liquids from solids
c) solids from solids
d) liquids from gases
Answer »Answer: (b)
Question : 4
The chemical name of 'Marsh gas' is
a) Propane
b) Ethene
c) Methane
d) Hexane
Answer »Answer: (c)
Question : 5
Which of the following is the best example of the law of conservation of mass?
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.
Answer »Answer: (b)
Question : 6
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)
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