Indicators of a Change

Q.

Which of the following are the required conditions for rusting of iron?

1. None of the given options

2. It should be exposed to water

3. It should be exposed to air

4. It should be exposed to both air and water

Q.

What are the factors responsible for rusting in iron?

1. Physical process.

2. Chemical process.

3. Physical and chemical process.

4. Biological Process.

Q.

Which of the following is/are not a property of an acid?

1. Acids turn blue litmus red.

2. Acids turn red litmus blue.

3. These are sour to taste.

4. They are made up of non-metal oxides.

Q. Rotting of an egg is identified by:

1. change in smell
2. change in taste
3. change in state
4. change in colour

Q. Which of the following things change during the inflation of a balloon?

1. Size
2. Shape
3. State
4. Temperature

Q. In which of the following cases a tasting can be harmful to detect a change?

1. Ripening of mango
2. Cooking of rice
3. Souring of curd
4. Contamination of food

Q. An unknown substance X is poisonous. It also releases some toxic fumes. Which of the following indicators of change should not be used to identify any change in X?

1. Change in taste
2. Change in smell
3. Change in state
4. Change in colour

Q.

Rusting of iron can be identified by change in it's:

1. 
   

   Shape

2. 
   

   Volume

3. 
   

   Colour

4. 
   

   State

Q. Rusting of iron can be identified by change in it's:

1. state
2. shape
3. colour
4. volume

Q. Rusting of iron can be identified by change in it's:

1. colour
2. volume
3. shape
4. state

Q. Which of the following things change during the inflation of a balloon?

1. Size
2. Shape
3. State
4. Temperature

Q. Rusting of iron can be identified by change in it's:

1. shape
2. volume
3. colour
4. state

Q. Which of the following option cannot be used to identify the change when some sugar is dissolved in water?

1. Change in taste
2. Change in smell
3. Change in colour
4. Change in temperature

Q. Rotting of a banana can be identified by:

1. change in weight
2. change in temperature
3. change in colour
4. change in state

Q. Volume of a liquid can change on heating.

1. True
2. False

Q. Water droplets on a cold water bottle are the condensed form of water vapour in air.

1. True
2. False