CBSE Class 6 Science - CH6 - Changes Around Us (MCQs)

Changes Around Us

There are numerous ways to classify changes. Can you guess more types?

MCQs

Q1: Baking of dough into bread is a kind of change 

(a) that can be reversed
(b) that cannot be reversed
(c) that can be reversed at very hot temperature
(d) can't say


Q2: Which of the following is a reversible change?

(a) Curdling of milk
(b) Ripening of fruits
(c) Melting of ice
(d) Burning of wood


Q3: Which of the following is a desirable change?

(a) Burning of House
(b) Floods
(c) Landslides
(d) Burning of cooking gas



Q4(NCERT): Salt can be separated from its solution (salt dissolved in water), because

(a) mixing of salt in water is a change that can be reversed by heating and melting of salt.
(b) mixing of salt in water is a change that cannot be reversed.
(c) mixing of salt in water is a permanent change.
(d) mixing of salt in water is a change that can be reversed by evaporation.


Q5: Which of the following is an example of periodic change?

(a) Eruption of volcano
(b) Heartbeat
(c) A car accident
(d) Landslide


Q6: Changes in which heat is liberated are called _________

(a) exothermic changes
(b) endothermic changes
(c) rapid changes
(d) none of these


Q7: Iodine sublimes on heating i.e. directly changes into a gas state without going through liquid state. Which of the following change is not true for iodine sublimation?

(a) change is fast
(b) change is physical
(c) change is chemical
(d) change is reversible


Q8: In general, on heating metals _______

(a) contract
(b) expand
(c) can expand or contract
(d) none of these


Q9(NCERT): Iron rim is made slightly smaller than the wooden wheel. The rim is usually heated before fixing into the wooden wheel, because on heating the iron rim

(a) expands and fits onto the wooden wheel.
(b) contracts and fits onto the wooden wheel.
(c) no change in the size takes place.
(d) expands first, then on cooling contracts and fits onto the wooden wheel.


Q10: Which of the following can be considered as fast change?

(a) Growth of child
(b) Germination of seed
(c) Bursting of crackers
(d) Cooking of food



 Answers:
1: (b) that cannot be reversed

2: (c) Melting of ice
3: (d) Burning of cooking gas
4: (d) mixing of salt in water is a change that can be reversed by evaporation.
5: (b) Heartbeat
6: (a) exothermic changes
7: (c) change is chemical
8: (b) expand
9: (d) expands first, then on cooling contracts and fits onto the wooden wheel.
10: (c) Bursting of crackers