Nucleus — Physics STD 12 Science — Question

Field lines start from____ charges and ends at _____ charges.

For small currents, ‘X’ obeys Ohm’s law. But when large currents are passed through the same conductor, it deviates from ohmic behaviour. Identify X.

The band spectra (characteristic of molecular species) is due to emission of radiation:

Time period of oscillation of a magnetic needle is

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

________  represents the most significant digits of the resistance value in finding the  resistance of carbon resistor.

Particles which can be added to the nucleus of an atom without changing its chemical properties are called:

In the absence of an electric field, the mean velocity of free electrons in a conductor at absolute temperature (T) is:

The photoelectric effect can be understood on the basis of(a) The principle of superposition(b) The electromagnetic theory of light(c) The special theory of relativity(d) Line spectrum of the atom