Tag: air exerts pressure

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Questions Related to air exerts pressure

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

The experiment conducted using glass filled with water and card board indicates that _________. 

  1. Air has mass

  2. Air occupies space

  3. Air expands when heated

  4. Air exerts pressure
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The experiment conducted using glass filled with water and card board indicates that air exerts pressure.

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

Which of the following doesn't show that air exerts pressure?

  1. Riding a bicycle against wind

  2. Flying a kite

  3. Ball falling to the ground

  4. Drinking a soft drink through a straw
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A ball falling down to the ground is due to gravity and not due to air pressure. Hence, it doesn't show that air exerts pressure.

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

What is the best thing to do when strong winds are blowing over a hut having a weak thatched roof?

  1. Open the doors and windows

  2. Close all the doors and windowns

  3. Make holes in the roof

  4. Burn wood inside
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When winds blow over a week roof, it creates a low pressure over it and a high pressure inside causing the roof to be blown off. Opening the doors and windows reduces this pressure difference and avoids the roof from being blown off.

So, the correct answer is open the doors and windows

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

During the takeoff of an aeroplane there is a _____________pressure on the top and a _____ pressure below.

  1. Low, low

  2. Low, high

  3. High, high

  4. High, low
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Because of the curved upper surface of the aeroplane more air flows in the same time as compared to the lower surface. Therefore, the pressure over the aeroplane is less when compared to the lower surface.

So, the answer is low , High

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

Overhead cables need not be insulated because :

  1. air is a bad conductor of electricity

  2. air is a good conductor of electricity

  3. bare wires conduct electricity better than insulated wires

  4. none of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

As we know air is a bad conductor (It consists of mostly nitrogen and oxygen which are electrically neutral and are not easily ionized) of electricity. So, Overhead cables need not be insulated.

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

The humidity of a place:

  1. lies between 10% -20%

  2. is always more than 50%

  3. is always less than 80%

  4. varies from time to time
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The humidity of a place varies from time to time as it also depends on the place we reside in. Coastal areas have more humidity or is more humid due to the pressure of the sea breeze.