Answer: Here are examples for the above statements: (a) Heating of an iron rod (b) Baking of chapati (f) Formation of ice from water (d) Formation of salt solution (e) Mixing of cement with water Any changes which can be reversed or are a temporary conversion are known as reversible changes. Processes such as melting, boiling, evaporation, freezing, condensation, dissolution are reversible changes. Examples – Melting of wax, freezing of ice, boiling water which evaporates as steam and condenses back to the water. Irreversible changes are permanent changes. Reactants react to form an entirely new compound and cannot be reversed. Heating, burning, mixing, powdering are few processes that cause irreversible changes. Examples – Burning of a piece of paper, cooking of the raw egg.Reversible changes
Irreversible changes
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CBSE Class 6 Science Changes Around Us MCQs Set A with answers available in Pdf for free download. The MCQ Questions for Class 6 Science with answers have been prepared as per the latest syllabus, NCERT books and examination pattern suggested in Standard 6 by CBSE, NCERT and KVS. Multiple Choice Questions are an important part of Term 1 and Term 2 exams for Grade 6 Science and if practiced properly can help you to get higher marks. Refer to more Chapter-wise MCQs for NCERT Class 6 Science and also download more latest study material for all subjects Class 6 Science students should refer to the following multiple-choice questions with answers for Changes Around Us in standard 6. These MCQ questions with answers for Grade 6 Science will come in exams and help you to score good marksChanges Around Us Class 6 Science MCQ
Changes Around Us MCQ Questions Class 6 Science with Answers
Changes Around Us
Question. _____ is an irreversible change.
a. Burning of coal
b. Melting of wax
c. Melting of ice
d. Formation of ice
Answer: A
Question. Which of the following is an irreversible change:
a. A toy aeroplane made by folding paper
b. A roti
c. A balloon changes its size and shape on blowing air into it
d. Melting of wax
Answer: B
Question. Which of the following is not an example of the changes that occur by mixing two substances?
a. Salt dissolved in water
b. Mixing sand and water
c. Sugar dissolved in water
d. Burning of a matchstick
Answer: D
Question. A bag of cement lying in the open gets wet due to rain during the night. The next day the sun shines brightly. Do you think the changes, which have occurred in the cement, could be reversed?
a. Yes
b. No
c. Can’t say
d. All of theabove
Answer: B
Question: Physical chemical changes are a result of absorption ofa) some kind of energyb) light energy onlyc) heat energy onlyd) sound energy only
Answer: A
Question: A chemical change involvesa) change of state as well as compositionb) change of state onlyc) change of colour onlyd) None of these
Answer: A
Question: A physical change is a/an :a) permanent changeb) irreversible changec) temporary changed) None of these
Answer: C
Question: An example of a physical change isa) digestion of foodb) photosynthesis by plantsc) burning of woodd) magnetisation of iron
Answer: D
Question: An example of an undesirable change isa) earthquakeb) melting of snow on mountainsc) evaporation of waterd) flowering of plants
Answer: A
Question: An example of a periodic change isa) swinging of a clock pendulumb) rusting of ironc) landslides during rainsd) sneezing
Answer: A
Question: During physical and chemical changesa) no energy is absorbed or releasedb) energy is always releasedc) energy is always absorbedd) energy is either absorbed or released
Answer: D
Question: A change is an alteration in the physical and chemical properties of matter due to the effect of :a) heatb) lightc) some kind of energyd) pressure
Answer: C
Question: Physical changes area) temparary and can be reversedb) irreversiblec) permanentd) temporary and irreversible
Answer: A
Question. Physical chemical changes are a result of absorption of :
(A) heat energy only
(B) light energy only
(C) sound energy only
(D) some kind of energy
Question. A chemical change involves :
(A) change of state only
(B) change of colour only
(C) change of state as well as composition
(D) None of these
Question. A physical change is a/an :
(A) temporary change
(B) permanent change
(C) irreversible change
(D) None of these
Question. An example of a physical change is:
(A) magnetisation of iron
(B) burning of wood
(C) photosynthesis by plants
(D) digestion of food
Question. An example of a periodic change is :
(A) swinging of a clock pendulum
(B) landslides during rains
(C) rusting of iron
(D) sneezing
Question. During physical and chemical changes :
(A) energy is always absorbed
(B) energy is always released
(C) no energy is absorbed or released
(D) energy is either absorbed or released
Question. A change is an alteration in the physical and chemical properties of matter due to the effect of :
(C) some kind of energy
(D) pressure
Question. Physical changes are :
(A) permanent
(B) irreversible
(C) temporary and irreversible
(D) temparary and can be reversed
Answer Key
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