Who among the following became the first Indian to be

The distance between the focus and the centre of curvature of a spherical mirror in terms of the radius of curvature R, is equal to:

Half-life of a radioactive substance is 10 days. The time after which only 1/16th of it remains is:

The force that resists the motion of a body sliding over a surface is called:

Which of the following statement is correct?

I. Magnetite is a natural magnet

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

A silicon sample is doped such that the number of holes far exceeds the number of electrons. Which of the following is true about its conductivity?

A uranium nucleus undergoes fission and releases 200 MeV per event. If 1 gram undergoes complete fission, the energy released in kWh is:

What happens to the resistance of a wire if its length is doubled?  

Where is the magnetic force of a bar magnet the strongest?

Which of the following rays are not deflected by a magnetic field?