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Air Around Us

Description: This test is standardised achievment test in biology suitable for the students of cbse,icse and all other boards of class 6 and also useful for the students of diferent competitions and olympiads.
Number of Questions: 25
Created by:
Tags: Importance of air Air Around Us Air Expressing Amount, C.I
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Air exerts pressure in

  1. upward direction

  2. downward direction

  3. all directions

  4. north and south direction

  5. east and west direction

Show answer
Correct Option: C
Explanation:

Air exerts pressure in all the directions.

Which of the following gases is used in light bulbs?

  1. Neon

  2. Helium

  3. Argon

  4. Xenon

  5. Krypton

Show answer
Correct Option: C
Explanation:

Argon gas is used in electric lamps.

What is the full form of LPG?

  1. Light petrol gas

  2. Liquid petrol gas

  3. Liquefied petroleum gas

  4. Liquefied piped gas

  5. Liquid phosphorus gas

Show answer
Correct Option: C
Explanation:

Yes, the full form of the LPG is liquefied petroleum gas.

Mountaineers carry oxygen cylinders with them because____

  1. oxygen supports combustion.

  2. mountain air is very polluted.

  3. air becomes thinner as we go higher.

  4. air becomes denser as we go higher.

  5. there is no oxygen on the mountains.

Show answer
Correct Option: C
Explanation:

The air gets thinner as we go higher up towards space. When mountaineers climb very high peaks, they face Oxygen shortage due to less dense air and due to the  efforts being put in climbing, the need of their body increases .

Which of the following gases is required in the process of photosynthesis?

  1. Oxygen

  2. Water vapours

  3. Helium

  4. Carbon dioxide

  5. Nitrogen

Show answer
Correct Option: D
Explanation:

Carbon dioxide is required in the process of photosynthesis. Plants prepare their food with the help of carbon dioxide, water and sunlight and release oxygen.

Which of the following is called dry ice?

  1. Solid oxygen

  2. Solid helium

  3. Solid carbon dioxide

  4. Solid air

  5. Solid nitrogen

Show answer
Correct Option: C
Explanation:

Solid carbon dioxide is known as dry ice.

Which of the following is used to generate electricity by wind-power?

  1. Sail boats

  2. Wind mill

  3. Wind vane

  4. Balloons

  5. Parachutes

Show answer
Correct Option: B
Explanation:

Yes, wind mill can be used to generate electricity.

Which of the following gases is responsible for global warming?

  1. Oxygen

  2. Nitrogen

  3. Water vapours

  4. Carbon dioxide

  5. Inert gases

Show answer
Correct Option: D
Explanation:

Carbon dioxide has the property of absorbing heat. It traps the Earth's heat, as a result the temperature of the Earth's surface increases, resulting in global warming.

Which of the following property of air is used in the brake mechanisms of train?

  1. Work on air pressure

  2. Work on compressed air

  3. Correlate with air movements

  4. Runs on tyres with inflated air

  5. For generating energy by blowing wind

Show answer
Correct Option: B
Explanation:

Brake mechanism of train works on the compressed air.

Which of the following gases is released by denitrifying bacteria?

  1. Oxygen

  2. Nitrogen

  3. Carbon dioxide

  4. Helium

  5. Water vapours

Show answer
Correct Option: B
Explanation:

Nitrogen is released by denitrifying bacteria.

Which of the following is used as catalyst, during photosynthesis?

  1. Carbon dioxide

  2. Oxygen

  3. Water

  4. Chlorophyll

  5. Glucose

Show answer
Correct Option: D
Explanation:

Chlorophyll is used as catalyst during photosynthesis.

Which of the following plays an important part in the formation of coal?

  1. Starch of plants

  2. Chlorophyll of plants

  3. Gum and resins of plants

  4. Cellulose of plants

  5. Sucrose of the plants

Show answer
Correct Option: D
Explanation:

The cellulose of the plants is acted upon by bacteria, which removes the hydrogen and oxygen from the cellulose, leaving a residue rich in carbon which is known as coal.

How do animals, fishes and plants live without air, under water?

  1. The plants and animals come to the surface in regular intervals

  2. Aquatic plants and animals do not need air to survive

  3. Water contains dissolved gases which enable them to live

  4. They survive because of the interdependence of plants and animals

  5. The temperature of the water is suitable for them

Show answer
Correct Option: C
Explanation:

Yes, gases which are dissolved in the water, enable plants and animals to live.

Which of the following turns lime water milky?

  1. Oxygen

  2. Nitrogen

  3. Argon

  4. Carbon dioxide

  5. Helium

Show answer
Correct Option: D
Explanation:

Carbon dioxide turns lime water milky.

Nitrogen is utilized by plants for

  1. reproduction

  2. photosynthesis

  3. transpiration

  4. growth & development

  5. excretion

Show answer
Correct Option: D
Explanation:

Nitrogen is utilized by plants for protein synthesis, which is essential for growth and development of the plants.

An animal is kept in an air tight jar. After some time, it was found that the animal was struggling to remain alive and its movements were reduced. Why?

  1. Humidity in the jar increased

  2. Carbon dioxide in the jar has decreased and oxygen has increased

  3. Oxygen in the jar has decreased and carbon dioxide has increased

  4. Both oxygen and carbon dioxide have increased

  5. There is no proper space in the jar

Show answer
Correct Option: C
Explanation:

As we know, during respiration, oxygen is inhaled and carbon dioxide is exhaled. The animal, which was kept in the air tight jar, exhaled carbon dioxide and inhaled oxygen. After some time, all the oxygen of the jar was inhaled by the animal and carbon dioxide was exhaled, so the jar is filled with the carbon dioxide and there is a lack of oxygen, as a result the movements of the animal have reduced.

Which of the following statements is not true, regarding the properties of air?

  1. Air occupies space

  2. Air can be compressed

  3. Air exerts pressure

  4. Air has weight

  5. Air is a good conductor of electricity

Show answer
Correct Option: E
Explanation:

No, air is a bad conductor of electricity.

Which of the following gases is acidic in nature?

  1. Oxygen

  2. Carbon dioxide

  3. Nitrogen

  4. Helium

  5. Argon

Show answer
Correct Option: B
Explanation:

Carbon dioxide is slightly acidic in nature.

Which layer of atmosphere contains the ozone layer?

  1. Troposphere

  2. Mesosphere

  3. Stratosphere

  4. Thermosphere

  5. Exosphere

Show answer
Correct Option: C
Explanation:

Stratosphere contains the ozone layer and is above troposphere.

Which of the following statement is not true, about the balance of components in air?

  1. Carbon dioxide is released by respiration

  2. Oxygen is removed by respiration

  3. Nitrogen is removed by nitrogen fixation

  4. Carbon dioxide is removed by volcanic eruptions

  5. Oxygen is released by photosynthesis

Show answer
Correct Option: D
Explanation:

It is a wrong statement, because carbon dioxide is released by volcanic eruptions and not removed by it.

The humidity of a place

  1. lies between 10 - 20%

  2. is always more than 50%

  3. is always less than 1%

  4. is always about 80%

  5. always varies from time to time

Show answer
Correct Option: E
Explanation:

Humidity of a place is due to water vapours present in the atmosphere, which always vary from time to time.

Which scientist discovered carbon dioxide first, in 1630?

  1. Van Helmont

  2. Antoine Lavoisier

  3. Carl Scheele

  4. Joseph Pristeley

  5. Daniel Rutherford

Show answer
Correct Option: A
Explanation:

Van Helmont discovered carbon dioxide in 1630.

Which of the following gases protect us from the harmful ultraviolet rays of the earth?

  1. Carbon dioxide

  2. Oxygen

  3. Nitrogen

  4. Ozone

  5. Helium

Show answer
Correct Option: D
Explanation:

Ozone layer prevents us from the ultraviolet radiations of the sun.

Which of the following causes air pollution?

  1. Planting trees

  2. Taking measures to reduce smoke

  3. Using catalytic converters

  4. Burning of fuels

  5. Using unleaded petrol

Show answer
Correct Option: D
Explanation:

Burning of fuels is the main cause of air pollution.

Which of the following plays an important part while drinking a liquid with a straw?

  1. Humidity

  2. Composition of air

  3. Temperature

  4. Atmospheric pressure

  5. Space

Show answer
Correct Option: D
Explanation:

While drinking liquid with a straw, atmospheric pressure plays an important role.

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