Why is black the colour of mourning? Scientifically black denotes absence of all the colours. When a person dies, it leaves everybody in a state of mourning with no …
Why is a civil lines area called so? When the Britishers ruled over India, they wanted to keep both the Army and themselves away from the general public, for …
Why is the weather forecast an important part of the daily news. Weather is news today because people need accurate weather forecast to plan out their activities. Farmers need …
Why were the seven wonders of the ancient world famous? The seven wonders are man-mad objects which excelled in their architecture or craftsmanship built in the ancient times. They …
Why do aircrafts have to be pressurised? The density of the atmosphere at the ground is such that it is easy to breathe but as we go up, the …
Why is a fuse used in the electric circuits? The current passing through the domestic wiring depends on the power ratings of the appliance being used. If too many …
Why are chemical fertilisers preferred to manure? Chemical fertilisers are nutrient specific i.e. they can provide specifically nitrogen, potassium or phosphorus to the soil, as desired A manure on …
Why LPG is more advantageous than any other domestic fuels? Liquefied petroleum gas or LPG has a high calorific value than other domestic fuels of about 50 KJ per …
