Fire

Q.

Is fire living or nonliving?

Q. How do aquatic animals respire?

1. They come to surface of the water everytime they respire.
2. They take in dissolved carbon dioxide for respiration.
3. They use water for respiration.
4. They taken in dissolved oxygen for respiration.

Q. Among the gases present in air, which one supports burning of a substance?

1. Oxygen
2. Nitrogen
3. Carbon dioxide
4. Water vapour

Q. The Earth is surrounded by a thick layer of air called the ___________.

Q.

Air supports burning.

1. True

2. False

Q.

Wind does not help in the movement of which of the following?

1. Firki

2. Weathercock

3. Ceiling fan

4. Sailing yacht

Q.

Air is not present in:

1. Buildings

2. Ocean

3. Vacuum

4. Caves

Q.

Which Venn diagram represents the truth of the statement:

All smokers are drinkers and all drinkers are smokers

1. 

2. 

3. 

4. None of these.

Q.

Which of the following statement is correct ?

1. Air is present everywhere but not in water.
2. Air is present everywhere but not in mountains.
3. Air is present everywhere but not in soil.
4. Air is present everywhere but not in vacuum.

Q. Air, containing oxygen, is present all around us. We know that oxygen supports burning. So logically, in the presence of oxygen, even a small fire should burn down everything.

1. True
2. False

Q.

The main constituent of air is nitrogen, which supports combustion.

1. True
2. False

Q. Which of the following gases do not get involved in the process of combustion?
I. Argon
II. Oxygen
III. Hydrogen
IV. Nitrogen

1. I and IV only
2. I, III and IV only
3. I and II only
4. II and III only

Q.

Aquatic animals use _________ in water for respiration.

1. Dissolved salts.

2. Dissolved oxygen

3. Oxygen atom present in water molecule

4. Dissolved carbon dioxide

Q.

Question 3

How will you prove that air supports burning?

Q. why does a fish die when kept outside water inspiteof having oxygen in the air around it?

Q.

How will you show that air supports burning?

Q.

Air doesn't support burning.

1. True

2. False

Q. Among the gases present in air, which one supports burning of a substance?

1. Nitrogen
2. Carbon dioxide
3. Water vapour
4. Oxygen

Q. supports the burning/fire.

1. Water
2. Oxygen
3. Nitrogen
4. Carbon dioxide

Q. supports the burning/fire.

1. Water
2. Oxygen
3. Nitrogen
4. Carbon dioxide

Q. Which gas does not support burning?

Q.

1 Can you think of two situations when air is around us?

Q.

WHO DESCORSD LIQUID OXYGEN?

Q. Which of the following is required for combustion?​

1. Oxygen
2. Water vapour
3. Nitrogen
4. CO2