Which of the following does not pollute the air? - PakMcqs

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1. Which metal pollute the air of a big city?

   A. Copper B. Chromium C. Lead D. Cadmium Submitted by: Farjan Ahmed Soomro...

2. During which process of energy exchange does cold air displace warmer air?

   A. Convection  B.  Radiation C.  Conduction D.  None of these Submitted by: Rida...

3. Brass gets discoloured in air because of the presence of which of the following gases in air ________ ?

   A. Carbon dioxide B. Oxygen C. Nitrogen D. Hydrogen sulphide Submitted by: Rashid Mehmood...

4. Quantity of fresh air required for a man is 1000 cubic feet of air for every____________?

   A. 5 minutes B. 10 minutes C. 15 minutes D. 20 minutes Submitted by: WIQAR AHMAD...

5. Velocity of sound in air does not change with the change of?

   A. Temperature of air B. Pressure of air C. Moisture content in air D. Wind in the direction of propagation of sound Submitted by: Malik Asghar Hussain...

6. Inhaled air passes through which of the following in the last?

   A. Bronchiole B. Larynx C. Pharynx D. Trachea E. None of these Submitted by: Zeeshan Rafique Soomro...

7. Which of the following noble gases is abundant in air?

   A. Neon B. Helium C. Argon D. Methane Submitted by: Malik Asghar Hussain...

8. When sound waves travel from air to water which of the following quantities remains unchanged?

   A. Speed B. Frequency C. Intensity D. Wavelength Submitted by: Rashid Mehmood...

9. When a warm air is lifted off the surface in temperature depression it is called ________?

   A. An occlusion B. A cold front C. An anticyclone D. A warm front Submitted by: Mansoor Ul Haque...

10. It is observed that the total pressure exerted by air on the man of average size is around 14.7 lb wt. per square inch. But the man feels quite comfortable,. It is because of__________?

    A. An equal and opposite pressure acts from inside B. of the height of a man C. of gravity D. Earth pulls the man upward E. None of these Submitted by: Zeeshan Rafique Soomro...