Human beings can tolerate a daily exposure of upto what level of noise without suffering a substantial damage to hearing?

Which one of the following is not an ionising radiation?

All of the following rivers join the Ganga except:

All of the following Indian rivers are snow-fed except:

In India, the farmers traditionally sow the "kharif" crop during which of the following months?

The National Flag is a horizontal tri-colour. The deep saffron colour at the top represents?