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Air Around Us

Description: All about air
Number of Questions: 15
Created by:
Tags: Atmosphere carbon dioxide nitrogen windmill Air Around us Composition of Air Where is Air Present? Air Pollution Oxygen as a Component of Biotic and Abiotic World Comparison of Products of Fractions with the Fractions Themselves Multiplication of a Fraction by an Integer or Another Fraction Division in Fractions Multiplication Involving of Division of Decimal Numbers
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Plants take in nitrogen from ___________, which is used by plants to make proteins.

  1. atmosphere

  2. water

  3. bacteria in soil

  4. sunlight

  5. bacteria in leaves

Show answer
Correct Option: C
Explanation:

Yes, nitrogen fixing bacteria live in soil. They help in nitrogen fixation in soil. Thus, plants are able to take nitrogenous compounds from the soil.

A weathercock is an instrument used to ____________.

  1. forecast weather conditions

  2. tell the direction of wind

  3. work as an alarm to wake up with the sunrise

  4. works as an alarm for bad weather conditions

  5. tells the humidity in air

Show answer
Correct Option: B
Explanation:

Yes, it is an instrument to tell the direction of the wind.

Why do mountaineers carry oxygen cylinders with them while climbing high mountains?

  1. At high altitudes, pure oxygen is not available

  2. Oxygen available is very cold

  3. There is not sufficient amount of oxygen at higher altitudes

  4. The atmospheric pressure increases at higher altitudes

  5. None of these

Show answer
Correct Option: C
Explanation:

Yes, as height increases, the atmospheric pressure decreases. Therefore, when we move up the oxygen available for breathing becomes less and so the mountaineers need to carry oxygen cylinder to ensure sufficient oxygen supply.

Which of the statements is true regarding soil organisms?

  1. They get their nutrition from soil, hence known as soil organisms.

  2. They live in soil and respire in soil, hence known as soil organisms.

  3. Their colour resembles the soil, hence known as soil organisms.

  4. Both 1 and 2.

  5. Both 1 and 3.

Show answer
Correct Option: D
Explanation:

Yes, it is the correct answer.

Which of the following options support all the given statements?

(a) 1% of air is composed of it. (b) It does not support burning. (c) Plants need it for photosynthesis. (d) Humans exhale during respiration.

  1. Oxygen

  2. Carbon dioxide

  3. Nitrogen

  4. Carbon mono oxide

  5. Water

Show answer
Correct Option: B
Explanation:

Yes, 1% of air is composed of carbon dioxide, plants need it to make food during photosynthesis, carbon dioxide does not support burning.

Why do earthworms come out of soil, during heavy rainfall?

  1. To drink water

  2. To wash their old skin

  3. To breathe in air

  4. Their houses in soil get damaged

  5. Other soil organisms grow and push them out

Show answer
Correct Option: C
Explanation:

Yes, it is correct. Water fills up all the spaces occupied by the air in the soil. In this situation, animals living in the soil have to come out for respiration.

Which of the statements is / are incorrect?

  1. Atmospheric oxygen cannot be finished.

  2. Plants produce more oxygen than what they consume.

  3. Balance between oxygen and carbon dioxide is maintained by plants and animals.

  4. Plants are dependent on animals for food.

  5. Animals are dependent on plants for food.

Show answer
Correct Option: D
Explanation:

No, plants make their own food. They require sunlight and CO2 and chlorophyll. Hence, it is the correct answer.

Which of the following use / s wind energy to move?

  1. Yatch

  2. Gliders

  3. Parachute

  4. Dispersal of seeds

  5. All of these

Show answer
Correct Option: E
Explanation:

Yes, it is the correct answer.

Wind mill cannot be used for which of the following tasks?

  1. Generating electricity

  2. Running tube wells

  3. Running flour mills

  4. Water aeration

  5. Dispersal of seeds and pollens

Show answer
Correct Option: E
Explanation:

No, it cannot help in dispersal of seeds and pollen grains of flowers. Hence, it is the correct answer.

When water is poured on the lump of soil, bubbles are seen coming out of it. What are these bubbles made of?

  1. Soil organisms breathing out air.

  2. Soil has air, which gets replaced by water.

  3. The organisms in the soil decompose and foul CO2 comes out.

  4. The water poured on it gets evaporated by sunlight.

  5. None of these

Show answer
Correct Option: B
Explanation:

Yes, soil has air, which when replaced by water, comes out in the form of bubbles.

Ramesh dipped the open mouth of his glass bottle, keeping the bottle straight in a bucket filled with water to fill it. What happened?

  1. His bottle got half filled.

  2. His bottle was filled completely.

  3. His bottle was as it is i.e. no water went inside.

  4. His bottle first got filled but then again the water came out as it was upside down.

  5. His bottle sank inside.

Show answer
Correct Option: C
Explanation:

Yes, it is correct. The inverted bottle could not be filled with water as water was already filled with air, which could not escape out.

When water is boiled, bubbles can be seen coming up from the bottom of the pan. Which of the following is present in the water?

  1. Live microorganisms

  2. Carbon-dioxide

  3. Dissolved air in water

  4. Atmospheric oxygen entering water

  5. Excess of nitrogen gas in water as in atmosphere

Show answer
Correct Option: C
Explanation:

Yes, when water is boiled, air bubbles can be seen coming up from the bottom of the pan. This simple activity shows that air is present in water.

Which of the following statements is / are correct regarding water vapour? (a) Water vapour is the water that diffuses in the air above its boiling point. (b) Water vapour is water in its liquid state. (c) Fog and mist are forms of water vapour. (d) It is invisible.

  1. Only a

  2. Only b

  3. Only d

  4. Both a and c

  5. Both b and c

Show answer
Correct Option: C
Explanation:

Yes, it is the only correct statement. Water vapour is water in its gaseous state. Cloud, fog, or mist are all liquid water, not water vapour.

Factories have long _______________, to prevent us from harmful smoke.

  1. trees

  2. boundary walls

  3. pipe lines

  4. chimneys

  5. blast furnaces

Show answer
Correct Option: D
Explanation:

Yes, long chimneys protect us from the harmful smoke. It takes away the smoke.

What will happen if a child breathes with mouth and not with nose?

  1. He will breathe in more oxygen.

  2. Harmful dust particles will also enter.

  3. Saliva will not let harmful particles enter.

  4. Teeth will not let enough oxygen enter.

  5. None of these

Show answer
Correct Option: B
Explanation:

Yes, harmful dust particles may enter his body. Fine hair and mucus are present inside the nose to prevent dust particles from getting into the respiratory system.

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