Which instrument is used to detect the purity of milk?

A: Manometer

B: Sonometer

C: Lactometer

D: Hygrometer

Which one of the following is a water soluble vitamin ?

A: Vitamin A

B: Vitamin D

C: Vitamin B

D: Vitamin K

What is the biggest species of the cat family ?

A: Jaguar

B: Leopard

C: Lion

D: Tiger

Which one is the biggest planet in our solar system ?

A: Jupiter

B: Earth

C: Venus

D: Pluto

Who invented the smallpox vaccine ?

A: Louis Pasteur

B: James Chadwick

C: A. Fleming

D: Ronald Ross

Which of the following is not an element ?

A: Gold

B: Diamond

C: Ruby

D: Silver

Which one of the following is the lightest metal ?

A: Lithium

B: Mercury

C: Silver

D: Lead

Which gas is use in balloons ?

A: Oxygen

B: Argon

C: Nitrogen

D: Helium

Which element is common to all acids?

A: Oxygen

B: Carbon

C: Hydrogen

D: Sulfur

Which gas is usually filled in the electric bulb ?

A: Oxygen

B: Carbon dioxide

C: Hydrogen

D: Nitrogen