Tag: air exerts pressure

Questions Related to air exerts pressure

The atmospheric pressure decreases at the rate of ______________.

geography in search of the source of wind variations in atmospheric pressure properties of air pressure belts the concept of bernoulli's principle air exerts pressure

  1. 1 millibar/altitude of 10 meters

  2. 1 millibar/altitude of 15 meters

  3. 1 millibar/altitude of 18 meters

  4. 1 millibar/altitude of 20 meters

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Correct Option: A
Explanation:

Near Earth's surface the pressure decreases with height at a rate of about 1 millibars for every 10 metres. However, over cold air the decrease in pressure can be much steeper because its density is greater than warmer air.

When the temperature increases atmospheric pressure _________.

geography in search of the source of wind variations in atmospheric pressure properties of air pressure belts the concept of bernoulli's principle air exerts pressure

  1. increases

  2. decreases

  3. remains same

  4. became zero

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Correct Option: B
Explanation:

There exists a negative relation between pressure and temperature. When temperature increases pressure will fall and vice versa. That is why, pressure increases from equatorial region towards the polar region.

As one goes up from earth's surface, the temperature of air:

biology properties of natural resources the concept of bernoulli's principle variations in atmospheric pressure air exerts pressure

  1. increases

  2. decreases

  3. first increases and then decreases

  4. first decreases and then increases

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Correct Option: D

Fog can be defined as:

biology properties of natural resources the concept of bernoulli's principle variations in atmospheric pressure air exerts pressure

  1. Smoke from cigarette

  2. Polluted air from vehicles

  3. Clouds forming close to the ground

  4. A combination of smoke and dust particles

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Correct Option: C
Explanation:

Fog is a thick cloud of tiny water droplets suspended in the atmosphere at or near the earth's surface which obscures or restricts visibility.

Which of the following statements is true regarding the properties of air?

biology properties of natural resources the concept of bernoulli's principle variations in atmospheric pressure air exerts pressure

  1. It is a good conductor of electricity

  2. It is a good conductor of heat

  3. It is translucent in nature

  4. None of these

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Correct Option: D
Explanation:

Air is a good conductor of heat.

It is a good conductor of electricity.
It is translucent in nature.
Hence, option $(D)$ is the answer.

Which of the following can show the direction of wind ?

biology properties of natural resources the concept of bernoulli's principle variations in atmospheric pressure air exerts pressure

  1. Anemometer

  2. Wind wane

  3. Wind mill

  4. Barometer

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Correct Option: B
Explanation:

Anemometer: Used to measure the speed of the wind.


Wind wane: Used to show the direction of wind.


Windmill: Converts wind energy to rotational energy.

Barometer: Used to measure atmospheric pressure. 


Hence, option B is correct.

Which of the following is not true about air?

biology properties of natural resources the concept of bernoulli's principle variations in atmospheric pressure air exerts pressure

  1. air can be separated into components

  2. it can be liquefied

  3. liquid nitrogen has a b.p of $-196^\circ C$

  4. air has a chemical formula

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Correct Option: D
Explanation:

The statement which is not true about air is that it has a chemical formula. Air has no chemical formula. It is a mixture of gases.

Air can be separated into components by:

biology properties of natural resources the concept of bernoulli's principle variations in atmospheric pressure air exerts pressure

  1. filtration

  2. distillation

  3. fractional distillation

  4. any of the above

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Correct Option: C
Explanation:

The method used to separate air into its components is by fractional distillation.

Which of the following is not true about air?

biology properties of natural resources the concept of bernoulli's principle variations in atmospheric pressure air exerts pressure

  1. air has no chemical formula

  2. air can be separated

  3. air has no specific set of properties

  4. air has fixed composition

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Correct Option: D
Explanation:

Air has a variable composition. The other options are true regarding air.

Which gas in the air is essential for burning of wood?

biology properties of natural resources the concept of bernoulli's principle variations in atmospheric pressure air exerts pressure

  1. nitrogen

  2. hydrogen

  3. oxygen

  4. helium

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Correct Option: C
Explanation:

Oxygen is required for burning or combustion to take place.