Air and Atmosphere
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Composition of Air
SubtopicComposition of Air under Air and Atmosphere for Grade 7 ICSE.
Preview questions (no answers)
- 1.
Which gas acts as a diluent and prevents rapid burning in our atmosphere?
A.Oxygen
B.Carbon dioxide
C.Nitrogen
D.Hydrogen
- 2.
What provides the energy for the movement of air (wind) in the atmosphere?
A.The Moon
B.The Sun
C.Ocean waves
D.Volcanoes
- 3.
Which of the following gases is NOT used for breathing by humans?
A.Oxygen
B.Nitrogen
C.Carbon dioxide
D.Argon
- 4.
What is the state of water vapor in the atmosphere?
A.Solid
B.Liquid
C.Gaseous
D.Plasma
- 5.
Which property of air is utilized when we use a drinking straw to sip a liquid?
A.Air has no color
B.Air exerts pressure
C.Air is a mixture of gases
D.Air contains moisture
- 6.
When we exhale, the composition of the air changes. Which gas shows a significant increase in the exhaled air compared to inhaled air?
A.Oxygen
B.Nitrogen
C.Carbon dioxide
D.Argon
- 7.
The transparent nature of air is important because it allows:
A.Sunlight to reach the Earth's surface for photosynthesis
B.Heat to escape easily into space
C.Birds to fly at high speeds
D.Sound waves to travel faster
- 8.
The relative proportions of the major gases in the atmosphere (Nitrogen and Oxygen) remain nearly constant up to an altitude of approximately km. This region is known as the:
A.Heterosphere
B.Homosphere
C.Exosphere
D.Mesopause
- 9.
Which of the following statements about the 'Noble Gases' in the atmosphere is false?
A.They are chemically unreactive under normal conditions
B.They have a full outer shell of electrons
C.Argon is the most abundant noble gas in air
D.They constitute about of the atmosphere
- 10.
What is the result of passing air through a concentrated solution of Pyrogallol?
A.Carbon dioxide is absorbed
B.Nitrogen is absorbed
C.Oxygen is absorbed
D.All inert gases are absorbed
Download the worksheet for Air and Atmosphere - Composition of Air to practice offline. It includes additional chapter-level practice questions.
Properties and Uses of Oxygen and Nitrogen
SubtopicProperties and Uses of Oxygen and Nitrogen under Air and Atmosphere for Grade 7 ICSE.
Preview questions (no answers)
- 1.
Which gas remains in a test tube after all the oxygen has been removed from a sample of air?
A.Pure Oxygen
B.Mainly Nitrogen
C.Pure Hydrogen
D.Pure Carbon dioxide
- 2.
Which gas is crucial for the process of 'slow oxidation' occurring in our body cells to produce energy?
A.Nitrogen
B.Hydrogen
C.Oxygen
D.Argon
- 3.
The term 'Azote', meaning 'no life', was once used for which gas because it does not support respiration?
A.Oxygen
B.Nitrogen
C.Carbon dioxide
D.Hydrogen
- 4.
When magnesium ribbon is burnt in a jar of oxygen, it produces a:
A.Black soot
B.Dazzling white light
C.Blue flame
D.Yellow smoke
- 5.
In the laboratory preparation of Oxygen from , what is the recommended ratio of Potassium Chlorate to Manganese Dioxide by weight?
A.1:1
B.4:1
C.1:4
D.10:1
- 6.
What is the effect of increasing the pressure on the solubility of Oxygen in water?
A.Solubility decreases.
B.Solubility remains the same.
C.Solubility increases.
D.Oxygen becomes insoluble.
- 7.
Which oxide of Nitrogen is known as 'Laughing Gas'?
A.Nitric Oxide ()
B.Nitrogen Dioxide ()
C.Nitrous Oxide ()
D.Nitrogen Pentoxide ()
- 8.
Which of the following forms of 'Oxygen' protects the Earth from harmful ultraviolet (UV) radiation from the sun?
A.Diatomic Oxygen ()
B.Ozone ()
C.Nascent Oxygen ()
D.Liquid Oxygen
- 9.
If a burning candle is covered with a glass jar, it goes out after some time. This proves that:
A.Air contains nitrogen which is a non-supporter of combustion.
B.Oxygen is necessary for combustion and is present in limited amounts in the jar.
C.Carbon dioxide produced by the candle is a supporter of combustion.
D.The jar creates a vacuum that sucks out the flame.
- 10.
The percentage of oxygen in the air remains relatively constant at because:
A.Oxygen is not used in any natural process.
B.The rate of respiration and combustion is balanced by photosynthesis.
C.Nitrogen converts into oxygen during lightning.
D.Oxygen is continuously being produced by the evaporation of seawater.
Download the worksheet for Air and Atmosphere - Properties and Uses of Oxygen and Nitrogen to practice offline. It includes additional chapter-level practice questions.
Atmospheric Pollution
SubtopicAtmospheric Pollution under Air and Atmosphere for Grade 7 ICSE.
Preview questions (no answers)
- 1.
Which of the following gases is present in a very small amount () but plays a huge role in the Earth's temperature regulation?
A.Oxygen
B.Carbon dioxide
C.Nitrogen
D.Argon
- 2.
What is the result of excessive smoke and dust particles blocking sunlight in big cities?
A.Increased visibility
B.Haze and reduced visibility
C.Clear blue skies
D.More plant growth
- 3.
Which of these is a non-polluting way to travel short distances?
A.Motorcycle
B.Walking or cycling
C.Diesel bus
D.Petrol car
- 4.
Which of the following gases is NOT considered a major air pollutant in its natural concentration?
A.Nitrogen
B.Sulfur dioxide
C.Carbon monoxide
D.Nitric oxide
- 5.
The presence of which of the following in air causes irritation in the eyes and respiratory tract?
A.Helium
B.Argon
C.Oxides of Nitrogen
D.Neon
- 6.
Large scale planting of trees to combat air pollution and soil erosion is known as:
A.Deforestation
B.Afforestation
C.Agriculture
D.Sericulture
- 7.
Which chemical is often used in scrubbers to neutralize acidic exhaust gases like sulfur dioxide?
A.Water or Slaked lime
B.Concentrated sulfuric acid
C.Alcohol
D.Pure Nitrogen
- 8.
Hydrocarbons are a major group of air pollutants. What is the main environmental concern regarding unburnt hydrocarbons in the atmosphere?
A.They cause acid rain directly
B.They react with to form photochemical smog
C.They deplete the nitrogen content of the air
D.They increase the pH of rainwater
- 9.
Which metal used in the manufacture of batteries and glass can cause chronic poisoning leading to 'Plumbism' when inhaled or ingested as a pollutant?
A.Cadmium
B.Lead
C.Mercury
D.Chromium
- 10.
Soot, or 'Black Carbon,' is produced by the incomplete combustion of fossil fuels. Why is it considered a 'Short-Lived Climate Pollutant'?
A.It reflects all sunlight, causing immediate cooling
B.It only lasts in the atmosphere for a few days to weeks
C.It is easily converted into by bacteria
D.It has no impact on global temperature
Download the worksheet for Air and Atmosphere - Atmospheric Pollution to practice offline. It includes additional chapter-level practice questions.
Greenhouse Effect and Global Warming
SubtopicGreenhouse Effect and Global Warming under Air and Atmosphere for Grade 7 ICSE.
Preview questions (no answers)
- 1.
To help prevent global warming, we should promote the use of:
A.Petrol vehicles
B.Renewable energy sources
C.Coal stoves
D.Firewood
- 2.
What is the effect of global warming on mountain glaciers?
A.They grow in size
B.They remain unchanged
C.They melt and retreat
D.They turn into volcanic rock
- 3.
The increase in concentration since the Industrial Revolution is mainly due to:
A.Planting more forests
B.Increase in solar radiation
C.Burning of fossil fuels
D.Decrease in human population
- 4.
Which of these gases does NOT contribute to the greenhouse effect?
A.Methane
B.Oxygen
C.Carbon dioxide
D.Nitrous oxide
- 5.
Which of these is considered a 'clean' energy source because it does not emit greenhouse gases during operation?
A.Coal-fired power plants
B.Diesel generators
C.Wind turbines
D.Natural gas boilers
- 6.
If we stop all greenhouse gas emissions today, why would global warming still continue for some time?
A.Because the Sun is getting hotter every day.
B.Because existing greenhouse gases stay in the atmosphere for many years.
C.Because the Earth's core is releasing more heat to compensate.
D.Because plants will stop doing photosynthesis.
- 7.
What is the main reason why sea levels are rising currently?
A.More rain is falling directly into the ocean from the clouds.
B.The seafloor is rising due to volcanic activity.
C.A combination of melting land-based ice and the thermal expansion of water.
D.The melting of icebergs that are already floating in the ocean.
- 8.
If we stopped all human emissions today, why would global warming continue for several decades?
A.Because has a long atmospheric lifetime and the oceans have a high thermal inertia (holding heat).
B.Because the sun would start producing more heat to compensate.
C.Because plants would stop doing photosynthesis without human emissions.
D.Because the ozone layer would immediately disappear.
- 9.
What is the effect of 'Ocean Warming' on the intensity of the 'Water Cycle'?
A.It slows down the cycle as water becomes heavier.
B.It accelerates the cycle, leading to more intense evaporation and heavier precipitation events.
C.It stops the cycle by preventing clouds from forming.
D.It has no effect because the water cycle is driven by the moon.
- 10.
Why does 'Global Warming' potentially decrease the nutritional value of some crops like wheat and rice?
A.Because high levels can lead to faster growth but lower concentrations of essential minerals and proteins.
B.Because heat causes the crops to turn into sugar instantly.
C.Because there is not enough for the plants to breathe.
D.Because the plants spend all their energy reflecting sunlight.
Download the worksheet for Air and Atmosphere - Greenhouse Effect and Global Warming to practice offline. It includes additional chapter-level practice questions.