Nucleus — Physics STD 12 Science — Question

When a resistance of 2ohm is connected across the terminals of a cell, the current is 0.5 amperes. When the resistance is increased to 5 ohm, the current is 0.25 amperes. The internal resistance of the cell is(a) 0.5 ohm (b) 1.0 ohm(c) 1.5 ohm (d) 2.0 ohm

A strip of copper and another of germanium are cooled from room temperature to 80 K. The resistance of(a) Each of these increases(b) Each of these decreases(c) Copper strip increases and that of germanium decreases(d) Copper strip decreases and that of germanium increases

Production of electricity from magnetism is called.

Who discovered spin quantum number(a) Unlenbeck and Goudsmit(b) Nell’s Bohr(c) Zeeman(d) Sommerfield

For any charge configuration, equipotential surface through a point is _____ to electric field at that point.

When the light source is approaching, the Doppler effect for light is known as:

Who discovered the first spectral series?

The reactance of a circuit is zero. It is possible that the circuit contains:

1. An inductor and a capacitor.
2. An inductor but no capacitor.
3. A capacitor but no inductor.
4. Neither an inductor nor a capacitor.