Reversible and Irreversible Changes

Q. Boiling of water is an example of ___________ change.

1. irreversible
2. chemical
3. irrecoverable
4. reversible

Q.

Melting of ice cream is a ___ change. (reversible/irreversible)

Q. Wet clothes getting dry is an example of_____________.

1. non-desirable changes
2. chemical changes
3. irreversible changes
4. reversible changes

Q.

A small quantity of curd is added to warm milk. The milk is stirred and is set aside for a few hours at a warm place. In a few hours, the milk changes into curd. This is an irreversible change

1. Curd can be converted back to milk.

2. Curd cannot be converted back to milk.

Q.

Give an example of a physical change that is reversible and one of a chemical change that is reversible.

Q. Which amongst the following are physical reversible changes?

1. Tearing of paper
2. The melting of wax
3. Bursting of balloon
4. Freezing of water

Q.

1. Only (i) and (ii)
2. Only (ii) and (iii)
3. Only (i) and (iii)
4. (i), (ii) and (iii)

Q.

Which of the following is both reversible and irreversible change?

1. Rusting of iron

2. Formation of curd from milk.

3. There is no such case possible in general.

4. Both rusting of iron and formation of curd from milk.

Q.

Which of the following is both a reversible and an irreversible change?

1. Rusting of iron

2. There is no such case possible in general.

3. Both rusting of iron and formation of curd from milk.

4. Formation of curd from milk.

Q.

9. Heating and cooling any object is a _______ change.

Q. Dissolution of salt in water is a reversible change.

1. True
2. False

Q.

4. Write the changes which can be reversed.

Q.

Which among the following is an example of reversible change?

1. Making structures of sand on beach

2. Burning gasoline

3. Cutting of trees

4. Making egg omlett

Q.

Which of the following can be categorised as both reversible and irreversible change?

1. Formation of curd from milk.

2. Rusting of iron

3. There is no such case possible in general.

4. Both rusting of iron and formation of curd from milk.

Q. Reversible change refers to:

1. Change in which shape and size is changed
2. Change in which new substance is formed
3. Change that can be undone
4. Change that cannot be undone

Q.

The following figure shows irreversible change because,

1. Bread Omelette cannot be converted back to egg.

2. Bread Omelette on cooling can be converted back to egg.

3. Sometimes it is possible to get egg back from bread omlett and sometimes not.

4. No change will happen.

Q. Burning something is a/an ___________ change.

1. temporary
2. periodic
3. irreversible
4. reversible

Q. What type of changes are observed in the following image?

1. Man-made
2. Natural
3. Temporary
4. Permanent

Q. __________ are the changes that can be undone.

1. Reversible changes
2. Irreversible changes
3. Fast changes
4. Chemical changes

Q. Which among the following types of change are being depicted in the below figure?

1. Irreversible change

2. Reversible change.

3. No change is happening

4. It can be both reversible and irreversible changes.

Q. Isha was cutting some apples but in the middle of it Harry took her to play volleyball. After coming back she saw a brown coating over the apple slices. This formation of brown coating is which kind of change?

1. Physical change
2. Chemical change
3. Reversible change
4. Irreversible change

Q. Isha was cutting some apples but in the middle of it Harry took her to play volleyball. After coming back she saw a brown coating over the apple slices. This formation of brown coating is which kind of change?

1. Physical change
2. Chemical change
3. Reversible change
4. Irreversible change

Q. Bharath heated a vessel full of water. The water started boiling and after some time there is no water left inside the vessel. This is an example of _______ change.

1. reversible
2. irreversible
3. chemical
4. periodic

Q. Which among the following changes is irreversible in nature?

1. Setting of cement
2. Dissolution of sugar in water
3. Melting of candle wax
4. Woollen yarn to knitted sweater

Q. A small quantity of curd is added to warm milk. The milk is stirred and is set aside for a few hours at a warm place. In a few hours, the milk changes into curd. Which among the following statements is correct?

1. It is a periodic change.
2. It is a temporary change.
3. It is an irreversible change.
4. It is a reversible change.

Q. Identify the irreversible changes.

1. Breaking an egg
2. Tearing a paper
3. Curdling of milk
4. Breaking
   a mirror
5. Burning of wood
6. Folding of paper
7. Moulding clay
8. Blowing
   a balloon

Q. Which of the following is a reversible change?

1. Ripening of mango
2. Burning of wood
3. Melting of wax
4. Spoiling of milk