Atomic and Nuclear Physics — Physics STD 12 Science — Question

The electrostatic potential due to a point charge is directly proportional to:

A particle moving in a magnetic field increases its velocity, then its radius of the circle(a) Decreases(b) Increases(c) Remains the same(d) Becomes half

Among which of the following the magnetic susceptibility does not depend on the temperature?

What is the valence electron in alkali metal?

Fast neutrons can easily be slowed down by(a) The use of lead shielding(b) Passing them through water(c) Elastic collisions with heavy nuclei(d) Applying a strong electric field

In electromagnetic spectrum, the component whose wavelength is minimum is:

A particle moves in a region having a uniform magnetic field and a parallel, uniform electric field. At some instant, the velocity of the particle is perpendicular to the field direction. The path of the particle will be:

1. A straight line.
2. A circle.
3. A helix with uniform pitch.
4. A helix with nonuniform pitch.

X-rays are produced due to (a) Break up of molecules          (b) Changing in atomic energy level(c) Changing in nuclear energy level(d) Radioactive disintegration

A person wears glasses of power – 2.0 D. The defect of the eye and the far point of the person without the glasses will be(a) Nearsighted, 50 cm(b) Farsighted, 50 cm(c) Nearsighted, 250 cm(d) Astigmatism, 50 cm