EASY
6th CBSE
IMPORTANT
Earn 100

Look at the figure which shows three situations (a) a burning candle (b) an extinguished candle (c) melting wax.

Question Image

Which of these shows a reversible change and why?

Important Questions on Changes Around Us

EASY
6th CBSE
IMPORTANT
NCERT Exemplar Science - Class 6>Chapter 6 - Changes Around Us>VERY SHORT ANSWER QUESTIONS>Q 9
A piece of iron is heated till it becomes red-hot. It then becomes soft and is beaten to a desired shape. What kind of changes are observed in this process– reversible or irreversible?
MEDIUM
6th CBSE
IMPORTANT
NCERT Exemplar Science - Class 6>Chapter 6 - Changes Around Us>VERY SHORT ANSWER QUESTIONS>Q 10
Paheli had bought a new bottle of pickle from the market. She tried to open the metal cap to taste it but could not do so. She then took a bowl of hot water and immersed the upper end of the bottle in it for five minutes. She could easily open the bottle now. Can you give the reason for this?
MEDIUM
6th CBSE
IMPORTANT
NCERT Exemplar Science - Class 6>Chapter 6 - Changes Around Us>SHORT ANSWER QUESTIONS>Q 11

Can we reverse the following change? If yes, suggest the name of the method.

Water vapour into water.

MEDIUM
6th CBSE
IMPORTANT
NCERT Exemplar Science - Class 6>Chapter 6 - Changes Around Us>SHORT ANSWER QUESTIONS>Q 11

Can we reverse the following change? If yes, suggest the name of the method.

Water into water vapour.

EASY
6th CBSE
IMPORTANT
NCERT Exemplar Science - Class 6>Chapter 6 - Changes Around Us>SHORT ANSWER QUESTIONS>Q 11

Can we reverse the following change? If yes, suggest the name of the method.

Ice into water.

EASY
6th CBSE
IMPORTANT
NCERT Exemplar Science - Class 6>Chapter 6 - Changes Around Us>SHORT ANSWER QUESTIONS>Q 11

Can we reverse the following change? If yes, suggest the name of the method.

Curd into milk.

EASY
6th CBSE
IMPORTANT
NCERT Exemplar Science - Class 6>Chapter 6 - Changes Around Us>SHORT ANSWER QUESTIONS>Q 12

Which of the following changes cannot be reversed?
(a) Blowing of a balloon.
(b) Folding a paper to make a toy aeroplane.
(c) Rolling a ball of dough to make roti.
(d) Baking cake in an oven.
(e) Drying a wet cloth.
(f) Making biogas from cow dung.
(g) Burning of a candle.

EASY
6th CBSE
IMPORTANT
NCERT Exemplar Science - Class 6>Chapter 6 - Changes Around Us>SHORT ANSWER QUESTIONS>Q 13
Boojho’s sister broke a white dove, a symbol of peace, made of Plaster of Paris (POP). Boojho tried to reconstruct the toy by making a powder of the broken pieces and then making a paste by mixing water. Will he be successful in his effort? Justify your answer.