What are the environmental hazards that may occur when oil spills over a large surface area of the sea?
Explain how an “excited” hydrogen atom is able to emit radiations of different wavelengths.
Briefly explain how electric locomotives achieve their performance.
Explain how doping produces a p-type semi-conductor from pure semi-conductor material.
When a moving car encounters a patch of ice the brakes are applied. Why is it desirable to keep the wheels rolling on the ice without locking up?
A girl carries 20 litres in a Jerry can on her head and walks for 200 metres on a horizontal level ground. Explain why the girl does no work (Assume air resistance is negligible).
It is observed that a vehicle which has a door at the rear side gathers more dust inside when moving at high speed on a dusty road with the door open than the one which has an open door on ...
The control grid in a cathode ray oscilloscope (CRO) is used to control the brightness of the beam on the screen. Explain how this is achieved.
Differentiate between Zener breakdown and Avalanche breakdown as used in electronics.
