The Article of a company may be altered by _____________

The speed of a fast moving electron, having total energy of 2 MeV, is nearly:

Ultra violet radiations of the Sun do not reach the earth because, earth's atmosphere is surrounded by –

Which of the following is the best conductor of electricity?

A sphere of radius 1m encloses a charge of 10μC. Another charge of −5μC is placed inside the sphere. The net electric flux would be :

Which of the following statement is correct?

I. Magnetite is a natural magnet

II. A freely suspended magnet always aligns in N-S direction

The mass and energy equivalent to 1 a.m.u. respectively are -

In the absence of ozone layer, which rays will enter into atmosphere?

The mass of a star is two times the mass of the Sun. How it will come to an end?

Let the electric field part of an electromagnetic wave is E = {(2.3 N/C) cos [(1.2 rad/m) y + (2.4 × 10⁸ rad/s)t]} î.