Formation of Curd

Q. Germination of seeds is a change.

1. slow
2. physical
3. reversible

Q.

During winter the color of maple leaf changes to bright colors. What do you think about this change?

1. Physical change

2. Chemical change

3. Not sure as no pigment details are provided

4. Both chemical and physical changes

Q.

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

1. Curd can be converted back to milk.

2. Sometimes curd can be reverted back to milk and sometimes not.

3. Curd cannot be converted back to milk.

4. No change is happening.

Q.

Which of the following is physical change?

1. Grinding of wheat to make flour

2. Cooking of rice

3. Ripening of fruit

4. None of these

Q.

Chef Mehboob is mixing water and adding colour to the food he is cooking. Are we looking at physical or chemical change?

1. Chemical change

2. Physical change

3. Cannot be ascertained

Q.

Rashi added ice cubes to orange juice. This is an example of physical change.

1. True

2. False

Q. Which of the following is an irreversible change?

1. Folding of paper
2. Formation of curd
3. Melting of ice cream
4. Melting of ice

Q.

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

(d) Curd into milk.

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 an irreversible change.
2. It is a reversible change.
3. It is a very fast change.
4. It is a temporary change.

Q. Growth in plants and animals is
(a) a physical change.
(b) a chemical change.
(c) neither a physical change nor a chemical change since it is a life process.
(d) either a physical change or a chemical change depending on how much the growth is.

Q. Baking of bread, biscuits and muffins is a reversible change.

1. False
2. True

Q.

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

1. Curd cannot be converted back to milk.

2. Curd can be converted back to milk.

3. Sometimes curd can be reverted back to milk and sometimes not.

4. No change is happening.