What is the name of the gas used in an air conditioner?

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1. Units of electricity consumed by 2500 watt air-conditioner in one hour are_________?

   A. 25 units B. 2.25 units C. 2.5 units D. 0.25 units Submitted by: Ashfaque Ali Khoso...

2. 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...

3. 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...

4. 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...

5. What is the third most common gas found in the air we breathe ________ ?

   A. Hydrogen B. Neon C. Carbondioxide D. Argon Submitted by: Rashid Mehmood...

6. The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is ________ ?

   A. Argon B. Xenon C. Helium D. Krypton Submitted by: Rashid Mehmood...

7. The gas, commonly known as “laughing gas”, is

   A. Carbon Dioxide B. Sulfur Dioxide C. Nitrous Oxide D. Sodium Oxide...

8. Which of the gas is not known as green house gas?

   A. Methane B. Nitrous oxide C. Carbon dioxide D. Hydrogen Submitted by: Farjan Ahmed Soomro...

9. As comets get close to the sun, they start to “melt” and release gas and dust. This gas and dust forms what?

   A. “coma” around the comet’s nucleus and a long tail that points away from the sun B. “coma” that points away from the sun and a long tail around the comet’s nucleus C. Only “coma” around the comet’s nucleus D. Only a long tail that points away from the sun Submitted by: Muhammad Abdullah...

10. Who invented the Hot Air Balloon?

    A. Davy B. Montgolfier C. Edison D. Jarvik Submitted by: Asad Ullah Afridi...