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Prepared by: learnloophq@gmail.com

Last edited 25 days ago by Learn LoopHQ.

Answer key

Chapter: 06. Air And Atmosphere

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Air and Atmosphere: Practice Exam

Total Marks: [Decide based on your grading criteria, e.g., 50 marks] Time: [Decide based on your grading criteria, e.g., 1 hour]

Section A: Multiple Choice Questions (MCQs)

Choose the best answer for each question.

What is the thin layer of air surrounding the Earth called? (a) Gravity (b) Wind © Atmosphere (d) Oxygen

Which force binds the layer of air to the surface of the Earth? (a) Frictional force (b) Magnetic force © Gravitational force (d) Atmospheric pressure

Which of the following is NOT a characteristic of air? (a) It has mass. (b) It cannot be compressed easily. © It occupies space. (d) It is a mixture of gases.

Approximately what percentage of air is Nitrogen? (a) 21% (b) 0.03% © 78% (d) 0.93%

Which component of air is essential for burning? (a) Nitrogen (b) Carbon dioxide © Water vapour (d) Oxygen

The amount of water vapour present in the air is called: (a) Precipitation (b) Condensation © Humidity (d) Evaporation

Which process do green plants use to make their food from carbon dioxide and water? (a) Respiration (b) Combustion © Photosynthesis (d) Nitrogen fixation

What is the main substance formed during the rusting of iron? (a) Carbon dioxide (b) Hydrated iron oxide © Nitrogen (d) Water

Which human activity primarily contributes to increasing carbon dioxide in the atmosphere? (a) Planting trees (b) Burning fossil fuels © Using public transport (d) Nitrogen fixation

Which atmospheric layer protects us from harmful ultraviolet (UV) rays from the Sun? (a) Troposphere (b) Stratosphere © Ozone layer (d) Mesosphere

Section B: Fill in the Blanks

Complete the following sentences with the correct word(s).

Moving air is called _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.

Air is _ _ _ _ _ _ _ _ _ _ _ _ _ _ _, odourless, tasteless, and transparent.

The process by which plants make their food is called _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.

The amount of water vapour in the air is called _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.

Oxygen reacts with digested food to produce energy in a process called _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.

The main component of air by volume is _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.

The solid form of carbon dioxide used for cooling is called _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.

LPG has an added chemical called _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ to detect leaks.

The increase in the average temperature of the Earth’s atmosphere is known as _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.

Acid rain is formed when harmful gases like sulphur dioxide and nitrogen dioxide react with _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ in the atmosphere.

Section C: True/False Questions

State whether the following statements are True or False.

Air can be seen and smelled.

The composition of air is fixed at all places and all times.

Oxygen is needed for burning.

Plants only breathe out oxygen and never breathe in oxygen.

Rusting of iron requires the presence of both oxygen and water vapour.

CNG and LPG are considered cleaner fuels because they leave no residue on burning.

Deforestation helps to maintain the balance of oxygen and carbon dioxide in nature.

Smog improves visibility on roads.

The ozone layer protects us from harmful UV rays.

Respiration is a faster process than burning.

Section D: Explanations of Terms

Explain the following terms in one or two sentences.

Atmosphere

Humidity

Photosynthesis

Rusting

Air Pollutants

Section E: Short Answer Questions

Answer the following questions briefly.

List three characteristics of air.

What is the difference between inhaled air and exhaled air in terms of carbon dioxide content?

Why do divers carry oxygen cylinders when diving into the deep sea?

How does the presence of air in soil affect earthworms during heavy rains?

Give two uses of nitrogen in living organisms or industries.

What is the greenhouse effect, and which gas is a major contributor to it?

Why is the depletion of the ozone layer a concern?

Section F: Diagram-Based Questions

Observe the image below, which shows a simplified diagram of processes involving air.

{

"image_description": "A simplified cycle diagram showing a plant and an animal. Arrows indicate gases exchanged between the plant, animal, and the atmosphere. The plant takes in 'Gas A' from the atmosphere and releases 'Gas B'. The animal takes in 'Gas B' from the atmosphere and releases 'Gas A'.",

"style": "simple, educational, clear, line art",

"elements_to_include": ["plant", "animal", "atmosphere label", "arrows indicating gas exchange", "labels 'Gas A' and 'Gas B'"]

}

a. Identify Gas A. b. Identify Gas B. c. What process is shown by the arrow from the plant releasing Gas B into the atmosphere?

Observe the image below, which demonstrates a property of air.

{

"image_description": "A glass tumbler is inverted and pushed into a large vessel of water. Water does not enter the glass, indicating something is preventing it. A label points to 'Air trapped in glass'.",

"style": "simple, experimental setup, clear",

"elements_to_include": ["glass tumbler", "inverted position", "large vessel", "water", "label 'Air trapped in glass'"]

}

a. What property of air is demonstrated in this experiment? b. What would happen if you slightly tilted the glass while it is still inverted and submerged?

Section G: Identifying and Differentiating Concepts

Differentiate between Respiration and Burning based on: a. The amount of energy released. b. The speed of the process.

Identify whether the following substances are Air Pollutants (AP) or Essential Air Components (EAC): a. Oxygen b. Sulphur dioxide c. Nitrogen d. Carbon monoxide e. Water vapour

Section H: Environmental Awareness / Everyday Use

Why is it important to “grow more and more trees” as a measure to prevent air pollution?

What is the significance of the “Pollution Under Control (PUC)” certificate for vehicles in India?

Section I: Long Answers

Describe the composition of air, listing at least five components and their approximate percentages. Explain how the presence of water vapour and dust particles in air can be demonstrated with simple activities.

Explain the natural balance of oxygen and carbon dioxide in the atmosphere. Discuss how human activities, specifically deforestation and burning fossil fuels, disrupt this balance and lead to environmental concerns.

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