Atomic and Nuclear Physics — Physics STD 12 Science — Question

The figure shows some of the electric field lines corresponding to an electric field. The figure suggests
  

In the equation AB = C, A is the current density, C is the electric field, Then B is:

A hollow metal sphere of radius 5cm is charged such that the potential on its surface is 10V. The potential at a distance of 2cm from the centre of the sphere(a) Zero(b) 10 V(c) 4 V(d) 10/3 V

When a hot liquid is mixed with a cold liquid, the temperature of the mixture:

1. First decreases then becomes constant.
2. First increases then becomes constant.
3. Continuously increases.
4. Is undefined for some time and then becomes nearly constant.

A charged particle is released from rest in a region of steady uniform electric and magnetic fields which are parallel to each other the particle will move in a(a) Straight line(b) Circle(c) Helix  (d) Cycloid

Sun radiates continuously and maintains its brightness because(a) Helium is converted into iron in its core(b) Of fusion of hydrogen nuclei into helium(c) Fusion of helium in hydrogen(d) Burning of carbon, in its core

A capacitor of 4μ F is connected as shown in the circuit (Fig.). The internal resistance of the battery is 0.5Ω. The amount of charge on the capacitor plates will be:

To demonstrate the phenomenon of interference, we require two sources which emit radiation(a) Of the same frequency and having a define phase relationship(b) Of nearly the same frequency(c) Of the same frequency (d) Of different wavelengths

Einstein was awarded Noble prize for: