CURIOUSITY QUIZ: AIR

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Test Your knowledge on 'Air' devised according to the DAV school science syllabus of 'My Living World' and the NCERT syllabus for the topic ' Blow Hot, Blow Cold' of 'Looking Around' for Class-5. Attempt all the questions by clicking on the right option. Submit the completed Form by clicking the 'Submit' button at the end of the Form. Get your score and the correct answer by clicking the 'View score' button. Good Luck! (Although the quiz is primarily meant for Class-5, students from Class-6 to Class-10 can, however, participate and enjoy the fun of the quiz.) You can also write your comments on the quiz in the Comment space given at the end of this Page or send your comments and questions related to this quiz for answer directly to the email account given below:

curiousitygroi@gmail.com

Before attempting the quiz, you may read an overview of the topic given below which will make you feel easier to answer the questions.

Overview:

Air is a mixture of various gases. Nitrogen and Oxygen are the two most abundant gases of air. The third most abundant gas is Argon. Although greenhouse gases like carbon dioxide account for a rise in global temperature, they maintain the minimum temperature of the earth conducive for life. Air also contains Ozone gas. It is a toxic gas at the ground level, but has a great role to play at the upper stratosphere to support life as it absorbs most of the harmful radiation from the sun. Air also contains dust particles and water vapours. Too much particulate matter generated by burning of fossil fuels causes a haze called the Smog reducing the visibility. The amount of water vapour in air keeps on varying depending on the temperature. Certain gasses released from industries and automobile exhausts get dissolved in the water vapours of the air that falls back to the earth in the form of Acid rain. Monuments like the Taj Mahal are at risk to acid rain as the marble of which they are made lose lustre on reacting with the acid rain. Hot air rises up as it is lighter than cold air. While Oxygen is the most reactive gas of air, Hydrogen is the lightest gas . Nitrogen is a chemically passive gas and it can be directly taken by the pants from air to make certain nitrogenous substances needed for their growth. We should plant trees and check air pollution for a cleaner and better air.

Now, attempt the quiz.

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The two most abundant gases of our atmosphere are Nitrogen and Oxygen. Which is the third most abundant gas of air of our atmosphere?

1 point

Ozone

Carbon dioxide

Helium

Argon

Clear selection

Which gas some plants can use directly from the air to produce useful substances needed for their growth?

1 point

Carbon dioxide

Nitrogen

Oxygen

Ozone

Clear selection

Which gas present in air is beneficial to us at the higher atmosphere , but is a pollutant at the ground level?

1 point

Argon

Helium

Carbon dioxide

Ozone

Clear selection

The gas whose amount varies in air depending on the wind and weather :

1 point

Carbon dioxide

Ozone

Water vapour

Nitrogen

Clear selection

How are the greenhouse gases (like carbon dioxide, methane etc) present in the air useful for sustaining life on the Earth?

1 point

They maintain the minimum temperature of the Earth for life by trapping the heat from the Sun.

They help in the photosynthesis process of the green plants.

They absorb the harmful ultra-violet rays of the Sun thus saving life on the Earth.

They save life on the Earth by regulating the weather and climate .

Clear selection

Recently, there has been an increase in the amount suspended particulate matter in the air over Delhi resulting in severe air pollution. What might be the main cause of this problem?

1 point

Burning of coal in coal based power plants in the neighboring regions of Delhi.

Increased number of vehicular traffic in and around the national capital.

Burning of crop residue by farmers after harvesting in the neighboring states.

Release of particles from construction sites in and around Delhi.

All the above answers are correct.

Clear selection

Why are our breath visible on a cold winter morning?

1 point

Our breathe rapidly gains moisture from the surrounding cold air making it visible.

The water vapours in our breathe freeze to tiny ice particles on meeting cold air making our breathe visible.

The water vapours present in our breathe condense to tiny droplets on meeting cold air making it visible.

The water from our mouth get deposited over the smoke particles of the surrounding air making visible for us.

Clear selection

Why does a paper snake rotate when placed over a candle?

1 point

The carbon dioxide gas rising from the burning candle rotates the paper snake.

The cold air rising from the burning candle rotates the paper snake.

The hot air rising from the burning candle rotates the paper snake.

As oxygen gas rushes towards the flame of the burning candle , it causes a current in the air making the paper snake to rotate.

Clear selection

How do the elephants living in the tropical rain forests of India cool themselves to get rid of the prevailing dry harsh conditions?

1 point

By spraying water on their bodies with the help of their trunks.

By lying in the muds of nearby water bodies and resting under shady trees.

By taking frequent baths in jungle streams

By swinging their large ears like fans to blow air around their bodies.

Clear selection

What is NOT true about Oxygen present in air?

1 point

It helps in burning.

It oxidizes the food we eat to provide us energy required for various life processes.

It is a combustible gas.

It is not combustible, but it helps in combustion.

Clear selection

What is NOT true about Carbon dioxide present in air?

1 point

It is used in fire fighting as it extinguishes fire.

It is present in a very large amount in air.

Plants absorb it directly from the air to produce carbohydrates, the food that we eat.

It is a greenhouse gas.

Clear selection

How does a hot tea get cooled when we rapidly blow air over it from our mouths to prevent our tongues from getting burnt?

1 point

The hot tea losses its heat by gaining moisture from the surrounding air.

The hot tea losses its heat to the cold air being blown over it.

The hot tea gets cooled by radiating heat to the surroundings.

The hot tea gets cooled by absorbing water vapour from the surrounding air.

Clear selection

I am a gas present in air. I am very light to weigh as children often love to put me in gas balloons to fly in air. People also use me as a fuel as I am highly combustible by nature . Can you identify me?

1 point

Helium

Argon

Hydrogen

Oxygen

Clear selection

Sometimes we blow hot air from our mouths to warm our hands on a cold winter morning. How is the air coming from our mouth is warmer ?

1 point

The air coming out from our mouths is maintained at a higher pressure and, hence, is warmer.

The air coming out from our mouths has less moisture content and , hence, is warmer.

The air coming out from our mouths mostly contains Carbon dioxide gas which is hotter than the surrounding air.

The air coming out from our mouths is maintained at the body temperature which is warmer than the surrounding cold temperature.

Clear selection

Why does the sky generally appear cleaner after a shower of rain?

1 point

The rains wash out the dirty particles of the air.

The rains increase the moisture contents of air making it cleaner to look.

The suspended dust particles in air are settled down because of the rains making it cleaner to look.

The rains remove the smoke particles from the air making it cleaner to look.

Clear selection

If we blow air to a burning candle, it extinguishes. On the other hand, if we blow air to a red hot ( burning) charcoal, it burns more vigorously. Can you explain this phenomenon ?

1 point

The burning candle extinguishes because it gets more of Carbon dioxide ; on the other hand, the red hot charcoal burns more vigorously as it gets more of oxygen from the air we blow.

The burning candle extinguishes because the burning fuel matter (i.e. the vapourized wax particles ) are blown away by the air we blow ; on the other hand, the red hot charcoal burns more vigorously as it gets more of oxygen from the air we blow.

The burning candle extinguishes because it is cut off from oxygen gas from the surrounding air ; on the other hand, the red hot charcoal burns more vigorously as it gets more of oxygen from the air we blow.

The burning candle extinguishes because it gets more of water vapour from the air we blow ; on the other hand; on the other hand, the red hot charcoal burns more vigorously as it gets more of oxygen from the air we blow.

Clear selection

The highest altitude a man has flown in a Hot Air Balloon is 68,986 feet which was achieved by Dr Vijaypat Singhania of India who flew over Mumbai in India in November 2005. The working of a Hot Air Balloon is based on the principle :

1 point

As the balloon goes up, the temperature continuously decreases allowing it to move up easily.

Bodies tend to float in air if they are lighter than air.

Hot air rises up.

As the balloon goes up, the density of air continuously decreases allowing it to move up easily.

Clear selection

A highly poisonous gas present in air that is produced by the incomplete combustion of fuel . This gas is highly poisonous because it reduces the oxygen carrying capacity of the blood. Name the gas:

1 point

Ozone

Carbon dioxide

Carbon monoxide

Argon

Clear selection

This is a colourless, odourless gas present in air. This is insoluble in water. The gas is mainly used for making fertilizers for plants. Name the gas :

1 point

Ozone

Carbon dioxide

Chlorine

Nitrogen

Clear selection

Which is the most reactive gas present in air (as it has most number of compounds found in nature) ?

1 point

Ozone

Carbon monoxide

Carbon dioxide

Oxygen

Clear selection

The amount of water vapour present in air is highly variable ( 0.2% to 4%). What property of air determines the amount of water vapour that it will contain?

1 point

Pressure

Temperature

Humidity

Wind speed

Clear selection

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