Changes Around Us Class 6 Quiz Question with Answer
Changes Around Us Class 6 Quiz Question with Answer. CBSE Class 6 Science Lesson 6 Mock Test.
(1) Which of the following changes can be reversed?
(a) Cooked dal to dal
(b) Cold milk to hot milk
(c) Idali to batter
(d) None of the above
Answer: – b) cold milk to hot milk
Explanation: – cold milk to the hot milk and hot milk to the cold milk both are reversible processes. But the other changes are not reversible this are irreversible changes which cannot be reversed.
(2) Which of the following changes can not be reversed?
(a) Bud to flower
(b) Raw egg to boil egg
(c) All of the these are irreversible
(d) Rusted iron to non-rusted iron
Answer: – d) All of these are irreversible.
Explanation: – Among the given options no one can be reversed into original condition hence these all are irreversible.
(3) Metal rim is fired on wooden wheel by _______
(a) heating
(b) cooling
(c) both a and b
(d) none of these
Answer: – a) heating
Explanation: – when we heat metal rim it expand and it gets fixed on wooden wheel.
(4) heating of metal rim does the process of __________
(a) expansion
(b) contraction
(c) both a and b
(d) none of these
Answer: – a) Expansion
Explanation: – expansion is the process which is carried out on heating the metal.
(5) Melting of wax is done with the help of which of the following process?
(a) Heating
(b) Without heating
(c) Cooling
(d) Evaporation
Answer: – a) Heating
Explanation: – heating leads to the melting of wax. All the other options are wrong in these condition.
(6) Sawing of a piece of wood is what type of change?
(a) Chemical and Reversible change
(b) Chemical and irreversible change
(c) Physical and irreversible change
(d) Physical and reversible change
Answer: – c) Physical and irreversible change
Explanation: – sawing a piece of wood is a physical change along with that it is a irreversible process, after sawing it cannot get back to that condition again.
(7) Which of the following process converts solid into liquid by heating?
(a) Condensation
(b) Evaporation
(c) Melting
(d) Freezing
Answer:-c) Melting
Explanation: – By the process of melting solid is converted into liquid.
Evaporation changes liquid into gaseous,
Freezing changes liquid into solid,
Condensation is the process in which gaseous are converted into liquid.
(8) Which process is carried out for the conversion of gaseous into liquid?
(a) boiling
(b) Heating
(c) Freezing
(d) Condensation
Answer: – d) condensation
Explanation: – Condensation is the process in which gaseous are converted into liquid.
Freezing changes liquid into solid, heating leads to change the solid into liquid, boiling convert the liquid to the vapors.
(9) Which one is not expands after heating?
(a) Iron
(b) Aluminum
(c) Wood
(d) Copper
Answer: – c) Wood
Explanation: – all metals expand on heating. Thus Copper, aluminum, iron expands on heating but wood is not metal hence it does not expand.
(10) Which type of change is found in Rusting of Iron?
(a) Physical change
(b) Chemical change
(c) Slow change
(d) Reversible change
Answer: – b) chemical change
Explanation: – Rusting of iron is a chemical change, and chemical change is irreversible process.
(11) Which of the following pair is incorrect?
a) sawing of a piece of wood | Physical changes |
b) melting of wax | Without heating |
c) Irreversible changes | No new substance is formed |
d)Reversible changes | New substance is formed |
Answer: – b) melting of wax – without Heating
Explanation: – All pairs are correct only melting of wax needs heating so correct option is (b).
(12) water vapor changes into liquid
(a) Heating
(b) Melting
(c) cooling
(d) All the above
Answer: – c) cooling
Explanation: – water vapour converted into liquid when it is cooled.
Other option heating and melting does not convert water vapors into liquid.
(13) When we provide continue heat on water in the pan, then what will happen?
(a) quantity decrease
(b) quantity increase
(c) No changes will be occur
(d) None of these.
Answer: – a) quantity decrease
Explanation: – quantity of water will be decrease because continue heat on water liquid will be changed into water vapour are quantity is decreased.
(14) Milk to paneer is which type of process?
(a) Reversible process
(b) Irreversible process
(c) Chemical process
(d) All of these
Answer: – b) irreversible process
Explanation: – paneer cannot be converted into milk again so it irreversible process.
(15) Which of the following process is responsible for changes?
(a) chemical reaction
(b) heating
(c) melting
(d) all of these
Answer: – d) all of these
Explanation: – all of these factors can bring a changes to the substance.
(16) The process by which material become larger is ______?
(a) chemical change
(b) physical changes
(c) expansion
(d) contraction
Answer: – c) expansion
Explanation: – material increase in size by heating is called expansion.