Explain refraction?
You want to magnetize a metal. How would you do that?
What is the value of magnetism at the center of earth?
Explain diffraction?
What are rectifiers used for?
Explain big bang theory?
Explain radio telescopes?
What do you mean by newton meter?
What is the weight of automotive oil?
What is the difficulty in making fusion based nuclear reactors?
State 'law of machines'?
In which medium does the sound travel fatest?
Explain optical telescopes?
Which property of the rain coat makes it water proof?
Explain nuclear fission?