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 6 ICSE.
Preview questions (no answers)
- 1.
Plants use Carbon dioxide and release Oxygen. Humans use Oxygen and release Carbon dioxide. This balance is maintained by:
A.The Nitrogen cycle
B.The Oxygen-Carbon dioxide cycle
C.The Water cycle
D.The Rock cycle
- 2.
What is the approximate percentage of Argon in the air?
A.B.C.D. - 3.
Which gas is used for filling weather balloons because it is very light?
A.Nitrogen
B.Helium
C.Oxygen
D.Carbon dioxide
- 4.
Which of the following is used to measure the speed of wind?
A.Thermometer
B.Barometer
C.Anemometer
D.Lactometer
- 5.
During respiration, which gas is primarily absorbed by the blood from the air in the lungs?
A.Nitrogen
B.Carbon dioxide
C.Oxygen
D.Argon
- 6.
Which of these is the most significant noble gas found in the Earth's atmosphere?
A.Helium
B.Argon
C.Neon
D.Xenon
- 7.
Which gas is produced during the fermentation of sugar by yeast cells?
A.Oxygen
B.Nitrogen
C.Carbon dioxide
D.Helium
- 8.
In a sample of air, what is the approximate combined volume of Nitrogen and Oxygen?
A.495
B.100
C.390
D.250
- 9.
A sample of air is collected in a rainy season. How will its composition differ from air collected in a peak summer season?
A.It will have more Oxygen.
B.It will have less Nitrogen.
C.It will have a higher percentage of water vapor.
D.It will have more Carbon dioxide.
- 10.
Which constituent of air is used in its liquid form as a refrigerant for preserving biological samples?
A.Liquid Oxygen
B.Liquid Nitrogen
C.Liquid Argon
D.Liquid Carbon dioxide
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 6 ICSE.
Preview questions (no answers)
- 1.
Which gas is present in the bubbles that escape from tap water when it is heated?
A.Dissolved air (including Oxygen and Nitrogen)
B.Only Carbon dioxide
C.Pure Hydrogen
D.Steam only
- 2.
What is the effect of Oxygen on a glowing splinter of wood?
A.It puts the flame out
B.It makes the splinter burst into flame
C.It turns the splinter blue
D.Nothing happens
- 3.
Which gas is described as the 'life-giver' or 'life-supporting gas'?
A.Oxygen
B.Nitrogen
C.Helium
D.Argon
- 4.
In a crowded room with no windows, which gas increases in concentration over time?
A.Oxygen
B.Nitrogen
C.Carbon dioxide
D.Argon
- 5.
The level of nitrogen in the atmosphere is maintained through a continuous recycling process. Based on the diagram of the nitrogen cycle, which term correctly identifies 'Process X', where bacteria convert nitrogenous compounds from decaying matter back into free nitrogen gas ()?
A.Nitrogen Fixation
B.Respiration
C.Denitrification
D.Photosynthesis
- 6.
Which gas is released when dilute nitric acid reacts with certain metals under specific conditions (though it is usually not used for lab prep of this gas)?
A.Oxygen
B.Nitrogen
C.Hydrogen
D.Helium
- 7.
A gas jar is filled with Oxygen. If a piece of burning phosphorus is introduced into it, what will be observed?
A.It will stop burning immediately
B.It will burn with a bright dazzling flame and form white fumes
C.It will produce a black soot on the sides of the jar
D.There will be no change in the burning phosphorus
- 8.
In the context of the environment, how does the high percentage of Nitrogen in air help in preventing frequent forest fires?
A.Nitrogen absorbs all the heat from the sun.
B.Nitrogen acts as a buffer that reduces the concentration of Oxygen, making it harder for a spark to start a large fire.
C.Nitrogen reacts with dry leaves to make them fireproof.
D.Nitrogen creates a layer of liquid on the trees.
- 9.
A scientist fills a jar with Nitrogen and another with Oxygen. She drops a piece of hot Sodium metal into each. In which jar will a reaction occur?
A.Only in the Oxygen jar, forming Sodium oxide.
B.Only in the Nitrogen jar, forming Sodium nitride.
C.In both jars, but the reaction in the Oxygen jar will be much more vigorous.
D.In neither jar, as Sodium only reacts with water.
- 10.
When Oxygen gas is passed through a silent electric discharge, it partially converts into Ozone (). How does this change affect the properties of the gas?
A.The gas becomes chemically inert like Nitrogen.
B.The gas gains a distinct pungent smell and becomes more reactive.
C.The gas becomes lighter than Hydrogen.
D.The gas turns into a liquid at room temperature.
Download the worksheet for Air and Atmosphere - Properties and Uses of Oxygen and Nitrogen to practice offline. It includes additional chapter-level practice questions.
Air Pollution and its Control
SubtopicAir Pollution and its Control under Air and Atmosphere for Grade 6 ICSE.
Preview questions (no answers)
- 1.
Which gas makes up the remaining 1% of the atmosphere along with argon and water vapor?
A.Oxygen
B.Nitrogen
C.Carbon dioxide
D.None of these
- 2.
What is the main cause of the hole in the Ozone layer?
A.Planting trees
B.Excessive use of CFCs
C.Using solar energy
D.Breathing
- 3.
Using lead-free petrol helps to reduce the amount of which toxic metal in the air?
A.Iron
B.Lead
C.Gold
D.Copper
- 4.
Which of the following is a symptom of breathing in soot and smoke?
A.Stronger lungs
B.Coughing and irritation
C.Better sleep
D.Higher energy levels
- 5.
Which of the following actions at an individual level can help reduce air pollution?
A.Using a private car for every short trip
B.Switching off lights and fans when not needed
C.Burning plastic bags in the backyard
D.Using chemical sprays frequently
- 6.
What is the impact of sulfur dioxide () on the leaves of plants?
A.It makes the leaves turn darker green
B.It causes yellowing of leaves (chlorosis)
C.It increases the size of the fruit
D.It strengthens the stem
- 7.
Which gas act as a diluent in the atmosphere, preventing the rapid burning of objects?
A.Oxygen
B.Carbon dioxide
C.Nitrogen
D.Hydrogen
- 8.
How does 'Crop Residue Burning' (Stubble Burning) contribute to a seasonal air quality crisis in many parts of the world?
A.It creates large amounts of water vapor that cause floods
B.It releases massive amounts of , , and fine particulate matter into the air
C.It removes the weight of the air, causing high winds
D.It absorbs all the nitrogen from the atmosphere
- 9.
What is the long-term effect of 'Ocean Acidification', a consequence of high atmospheric , on marine life?
A.It helps fish breathe better by providing more oxygen
B.It makes it difficult for shell-forming organisms (like corals and mollusks) to build their skeletons
C.It turns the entire ocean into fresh water
D.It increases the growth of all seaweeds exponentially
- 10.
Why does the 'Acid Rain' phenomenon often occur far away from the actual industrial source of pollution?
A.Because the acid only forms when the gases reach the poles
B.Because wind carries the and gases over long distances before they react with rain
C.Because factories are only built in rainy areas
D.Because the sun's rays are stronger in distant areas
Download the worksheet for Air and Atmosphere - Air Pollution and its Control to practice offline. It includes additional chapter-level practice questions.