How many major gases have been used in re​frig​er​a​tors since its invention?

Related Mcqs:

1. Which of the following invention is oldest ?

   A. Clock
   B. Microscope
   C. Barometer
   D. Cycle

   Submitted by: Mansoor Ahmed Suhag

2. Which one of the following gases is readily soluble in water at room temperature?

   A. Chlorine
   B. Nitrogen
   C. Ammonia
   D. Carbon dioxide

   Submitted by: ABDUL HAYEE

3. Which of the following gases do plants and trees give out during photosynthesis?

   A. Hydrogen
   B. Nitrogen
   C. Oxygen
   D. Carbon dioxide

   Submitted by: ABDUL HAYEE

4. Which of the following mixture of gases is required in gas welding?

   A. Oxygen and ethylene
   B. Oxygen and hydrogen
   C. Acetylene and oxygen
   D. Acetylene and hydrogen

   Submitted by: Ashfaque Ali Khoso

5. Most gases conduct electricity at:

   A. Normal pressure
   B. Very low pressure
   C. Very high pressure
   D. None of these

   Submitted by: Sami Khan

6. Cooking gas is mixture of which two gases?

   A. Hydrogen and oxygen
   B. Methane and CO2
   C. Methane and oxygen
   D. None of these

   Submitted by: Muhammad Mumtaz Haider

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. Which of the following noble gases is not present in atmosphere?

   A. Argon
   B. Helium
   C. Radon
   D. Xenon

   Submitted by: Malik Asghar Hussain

9. The gases used in different types of welding would include ___________?

   A. Oxygen and hydrogen
   B. Oxygen, hydrogen, acetylene and nitrogen
   C. Oxygen, acetylene and argon
   D. Oxygen and acetylene

   Submitted by: Rashid Mehmood

10. The gases used in different types of welding would include:__________?

    A. oxygen and hydrogen
    B. oxygen, hydrogen, acetylene and nitrogen
    C. oxygen, acetylene and argon
    D. oxygen and acetylene

    Submitted by: Farjan Ahmed Soomro