Atmosphere

Q.

Which substance is a gas at room temperature?

Q. What is the percentage proportion of oxygen in air ? Why is oxygen called active air.

Q. Which of the following is a major source of carbon dioxide emissions?

1. Forest cover
2. Hydroelectric power plant
3. Wind mills
4. Burning of fossil fuels

Q.

Air contains highest percentage of oxygen.

1. True
2. False

Q. What is atmosphere? [1 MARK]

Q.

Which of the following statements is true regarding the earth's atmosphere?

1. It gets denser with an increase in the altitude

2. It gets thinner with an increase in the altitude

3. It remains the same.

4. It contains no solid particles.

Q. what is a defination of carbon?

Q.

The layer of air around Earth is known as:

1. Atmosphere

2. Ionosphere

3. Environment

4. Ozone layer

Q.

The air that covers the whole of earth like a blanket is called ____

1. lithosphere

2. biosphere

3. atmosphere

4. hydrosphere

Q. The melting point of ice is _____ degree Celcius.

1. 50
2. 0
3. 100
4. 4

Q.

27. Troposphere is extended up to 6-20 km altitude from the earths surface but the amount of oxygen is less at higher altitudes, i.e., on mountains or hill tops. Justify.

Q.

Which of the following is the most abundant component of air?

1. Nitrogen

2. Oxygen

3. Carbon Dioxide

4. Water Vapour

Q. Which amongst these gases contribute to the greenhouse effect?

1. Oxygen
2. Nitrogen
3. Methane
4. Chlorine

Q.

Which of the constituents of air on increasing, causes global warming?

1. Nitrogen

2. Oxygen

3. Inert gases

4. Carbon dioxide

Q. Which of the following gases cause the harmful greenhouse effect?

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