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:
A ray of light passing through an equilateral triangular glass prism from air undergoes minimum deviation when angle of incidence is 75% of the angle o...
What happens to the resistance of a wire if its length is doubled? Â
Where is the magnetic force of a bar magnet the strongest?
Which of the following rays are not deflected by a magnetic field?
