What is given off on burning a candle ?
Why is ammonia solution added while preparing edta solution?
Explain the Hydrogen and its Compounds ?
What are the names of the three different rays emitted by radioactive substances ?
Why ate shadows longer at the end of the day ?
What are the factors that affect the viscosity of a liquid?
What is the composition of gun-powder ?
What is gas-filled lamp ?
Which wavelengths are visible to human eye?
Explain the Compound?
Why is the total eclipse of the earth a rare phenomenon ?
Explain the Isobars?
What is the difference between iron and steel ?