Electronics — Physics STD 12 Science — Question

A strip of copper and another of germanium are cooled from room temperature to 80K. The resistance of:

Consider the following two statements:

1. The linear momentum of a particle is independent of the frame of reference.
2. The kinetic energy of a particle is independent of the frame of reference.

1. Both A and B are true.
2. A is true but B is false.
3. A is false but B is true.
4. Both A and B are false.

Which of the following statement is not correct(a) Photographic plates are sensitive to infrared rays(b) Photographic plates are sensitive to ultraviolet rays(c) Infra-red rays are invisible but can cast shadows like visible light(d) Infrared photons have more energy than photons of visible light

Sound waves in air cannot be polarized because:

The ozone layer in the atmosphere absorbs:

What is the nature of equipotential surfaces in case of a positive point charge?

Which of the following is/ are true for "magnetic lines of force around a bar magnet"?

The photoelectric current does not depend upon the:

1. Frequency of incident light.
2. Work function of the metal.
3. Stopping potential.
4. Intensity of incident light.