What is a good source of energy?
A good energy source is more efficient than any other energy source. They are called good sources because they can produce lots of heat per unit mass.
They are easily available in nature and cause very less amount of pollution.
They are very cheap in price and easily accessible.
Why does a compass needle get deflected when brought near a bar magnet?
Answer: A compass needle is also one type of small bar magnet. So, if we bring a compass needle near a bar magnet, it will either attract or repel the compass needle.
Download NCERT Solutions pdf of Electricity class 10. All questions are answered by our top teachers. NCERT Solutions Class 10 – Electricity
Why does the sky appear dark instead of blue to an astronaut?
Answer: The sky appears black instead of blue to an astronaut in outer space because there is no atmosphere. Hence no scattering happens. As no scattered light reaches the eyes of the astronauts, the sky appears black to them.
Chapter 10 – Page no 168 Question 1: Define the principal focus of a concave mirror. Answer: When Light rays that are parallel to the… Read More »Light Reflection and Refraction – NCERT Solutions for Class 10 with pdf
