Pilots uses aneroid barometer to know the height above sea level because

Under which conditions is work done

Which of the following operates based on magnetic effect of electric current?

When a bus is accelerating, it must be

The friction due to air mass can be reduced by

The stress experienced by a wire of diameter yπ m loaded by a weight y2 N is

The mechanical advantage of the machine shown above

Find the value of a capacitor with voltage 5V and 30C.

Rainbow is formed when sunlight undergoes