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Science MCQ GK Questions


  1. Brass gets discolored in air because of the presence of which of the following gases in air?

 

Oxygen

Hydrogen sulphide

Carbon dioxide

Nitrogen

 

 

 

 


  1. Which of the following is a nonmetal that remains liquid at room temperature?

 

Phosphorous

Bromine

Chlorine

Helium

 

 

 

 


  1. Chlorophyll is a naturally occurring chelate compound in which central metal is

 

copper

magnesium

iron

calcium

 

 

 


 

  1. Which of the following is used in pencils?

 

Graphite             

silicon  

charcoal              

zinc

 

 

 

 


5.Which of the following metals forms an amalgam with other metals?

 

Tin

Mercury

Lead

Zinc  

Phosphorous

 

 

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