The main constituent of haemoglobin is ?

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Laughing gas has chemical composition of following two elements ?

A. Nitrogen + Hydrogen B. Nitrogen + Carbon C. Nitrogen + Oxygen D. Oxygen + Carbon E. None of these...

Which of the following atmospheric layers help in radio communication?

A. Exosphere B. Ionosphere C. Troposphere D. Stratosphere E. Ozone layer...

The luster of diamond is due to_________?

A. Reflection B. Total internal reflection C. Refraction D. None of these...

What method of energy transfer requires no medium for transfer?

A. Radiation  B. Convection C. Conduction D. A and B both...

Which gas is used in preparation of Soda water?

A. Ammonia B. Hydrogen C. Nitrogen D. Carbon Dioxide...