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

Related Mcqs:

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

   A. Neon
   B. Helium
   C. Argon
   D. Methane

   Submitted by: Malik Asghar Hussain

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. The thermosphere extends from an altitude of ________ to the base of ________ at ________?

   A. 75 km, Mesosphere, 670 km
   B. 80 km, Ionosphere, 680 km
   C. 85 km, Exosphere, 690 km
   D. 90 km, Ozone Layer , 690 km

   Submitted by: Muhammad Abdullah

5. Which Vitamin gets destroyed on heating?

   A. B
   B. E
   C. K
   D. C

   Submitted by: WIQAR AHMAD

6. Which body part gets older first?

   A. Face
   B. Feet
   C. Hands
   D. None of these

   Submitted by: ENGR. HAFIZ RASHEED

7. 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

8. 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

9. 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

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

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

    Submitted by: Malik Asghar Hussain