Atmosphere

Q. The percentage of nitrogen in air is

1. 0.1%
2. 54%
3. 78%
4. 21%

Q.

The most abundant gas in the atmosphere is ___ .

1. Carbon dioxide

2. Nitrogen

3. Oxygen

4. Argon

Q. The layer of atmosphere closest to earth is called as stratosphere. True or false?

1. False
2. True

Q.

Why nitrogen is more in air?

Q.

Question 6

The layer of air around the earth is known as ___.

Q. The nitrogen content in air is:

1. 50%
2. 21%
3. 5%
4. 78%

Q. Which layer protects the Earth from harmful UV rays coming from the Sun?

1. Inert gas
2. Oxygen
3. Nitogen dioxide
4. Ozone

Q.

Which of the following gases cause the harmful greenhouse effect?

1. Hydrogen

2. Oxygen

3. Carbon dioxide

4. Nitrogen

Q. ________ is fast moving air.

Q. Burning of fossil fuels release _______ gas along with heat and light.

1. nitrogen dioxide
2. oxygen
3. hydrogen
4. carbon dioxide

Q. Earth is surrounded by a thick blanket of air called the:

1. All of the above
2. Planet
3. Atmosphere
4. Universe

Q.

A star has a core temperature of about $115,000,000°$$F$. The temperature of a lightning strike is about $10,300°$ $F$. Approximately how many times hotter is the core temperature of the star than the temperature of the lightning strike?

Q.

What are reservoirs of oxygen?

Q.

Which gas is used by living organisms for respiration? Where do they get it from? [2 MARKS]

Q.

The layer of air around the earth is known as __________.

1. environment

2. atmosphere

3. ionosphere

4. ozone layer

Q.

Lack of which of the following will kill you faster?

1. Food

2. Air

3. Soil

4. Water

Q. The percentage of nitrogen in the atmosphere is nearly:

1. 78%
2. 28%
3. 14%
4. 21%

Q.

a) Write down the composition of air.

(b) Give the relative amounts of the gases oxygen, nitrogen, and carbon dioxide present in the air. Based on your answer, arrange these gases in increasing order of their abundance.

Q. The air around us forms the atmosphere of the earth.

1. True
2. False

Q.

Give reason: "An aircraft is unable to fly on the moon".

Q.

What do you mean by fossil fuel? Give two examples of fossil fuel. List effects of pollution caused due to the burning of fossil fuels? [3 MARKS]

Q.

The layer of air around earth is known as ___ .

1. Environment

2. Atmosphere

3. Ionosphere

4. Ozone layer

Q.

__________ is the percentage of nitrogen in air.

1. 78%
2. 21%

3. 0.03%

4. 1%

Q.

Question 3 (e)

Which of the following statement is “true”?
Water vapour condenses to form tiny droplets of water in the upper layers of air where it is cooler.

Q. Which of the following statements are correct?
I - Carbon dioxide is essential for respiration.
II – Nitrogen and carbon dioxide support burning.
III – Oxygen is essential for humans, animals and plants for breathing.
IV – Nitrogen helps in maintaining an inert atmosphere due to its high abundance in the air and low reactivity.

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

Q.

Give one word or term for the following descriptions:

Changes from a vapor to a liquid.

Q. Neha took an apple from the fridge and kept it out. A little later she observed water droplets on it. This is due to the presence of in the air.

1. water vapour
2. carbon dioxide
3. nitrogen

Q. __________ is the most abundant gas in the atmosphere.

1. Carbon dioxide
2. Oxygen
3. None of the above
4. Nitrogen

Q. The layer of air around the earth is known as _________

Q. Air has a variable composition and hence there is more oxygen at higher altitudes than at lower altitudes.

1. True
2. False