Atmosphere

Q. When does the Summer Solstice occur?

1. 21st June
2. 23rd September
3. 22nd December
4. 21st March

Q.

Write just a few sentences for an imaginary situation if any of the following gases disappear from the atmosphere. (a) Oxygen (b) Nitrogen (c) Carbon dioxide.

Q. Which gas is the major component of the atmosphere?

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

Q.

101 Air is a mixture of two gases. Comment?

Q. How does the air around us heat up?

1. Rays of Sunlight.
2. Heat radiated from the Earth's surface.
3. Smoke from factories.
4. Humans

Q.

The thick layer of air present around the earth is known as ___________.

Q.

Make sentences using the given set of words.

(a) 99%, oxygen, nitrogen, air, together

(b) Respiration, dissolved, animals, air, aquatic

(c) Air, wind, motion, called

Q.

The amount of oxygen in the air remains the same, because the earth gives out oxygen.

1. True
2. False

Q. Which of these devices is commonly used to measure temperature?

1. Thermometer
2. Manometer
3. Barometer
4. Lactometer

Q. The huge blanket of air that surrounds the Earth is called _____.

1. atmosphere
2. troposphere
3. mesosphere
4. exosphere

Q.

How do you find the freezing point and boiling point ?

Q.

Carbon dioxide plays no role in respiration but all life would come to an end if there were no carbon dioxide in air. Support this statement with relevant facts.

Q.

The major consumers of carbon dioxide are___________.

Q.

Give one word for:

A device is used to measure the temperature.

Q.

Human beings contain oxygen in ______state.

Q. What is the freezing point of water?

1. 1°C
2. 0°C
3. 0.5°C
4. -1°C

Q. How does the sunss energy cause local winds?

Q.

48 Write a few sentences for an imaginary situation if any of the following gases disappear from the atmosphere

(a) Oxygen

Q. Which device would you use to measure temperature?

1. Barometer
2. Meter Scale
3. Thermometer
4. Anemometer

Q.

_______ and ________ are supplied by air to plants.

Q. Ozone layer is essential because it absorbs most of the

1. infrared radiations
2. heat
3. solar radiation
4. ultraviolet-radiation