Tag: properties of natural resources

Questions Related to properties of natural resources

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

Show answer
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

Show answer
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

Show answer
Correct Option: C
Explanation:

Oxygen is required for burning or combustion to take place. 

Which of the following is a property of air?

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

  1. Air has mass

  2. Air occupies space

  3. Air expands when heated

  4. All of the above

Show answer
Correct Option: D
Explanation:

Air has mass, air occupies space and air expands when heated are all properties of air.

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

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

  1. Air has mass

  2. Air occupies space

  3. Air expands when heated

  4. Air exerts pressure

Show answer
Correct Option: D
Explanation:

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

Which of the following is an air pollutant?

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

  1. $N _2$

  2. $CO _2$

  3. $O _2$

  4. $CO$

Show answer
Correct Option: D
Explanation:

Carbon monoxide is an air pollutant whereas carbon dioxide is considered as a greenhouse gas.

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

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

Show answer
Correct Option: C
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.

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

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

  1. Open the doors and windows

  2. Close all the doors and windowns

  3. Make holes in the roof

  4. Burn wood inside

Show answer
Correct Option: A
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

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

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

  1. Low, low

  2. Low, high

  3. High, high

  4. High, low

Show answer
Correct Option: B
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

Overhead cables need not be insulated because :

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

  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

Show answer
Correct Option: A
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.