Semiconductor Electronic: Material, Devices And Simple Circuits — Physics STD 12 Science — Question

Two sources are called coherent if they produce waves:

1. Of equal wavelength.
2. Of equal velocity.
3. Having same shape of wavefront.
4. Having a constant phase difference.

Non polar molecules has:

Heavy water is used as moderator in a nuclear reactor. The function of the moderator is(a) To control the energy released in the reactor(b) To absorb neutrons and stop chain reaction(c) To cool the reactor faster(d) To slow down the neutrons to thermal energies

A piece of copper and the other of germanium are cooled from the room temperature to 80 K, then which of the following would be a correct statement(a) Resistance of each increases(b) Resistance of each decreases(c) Resistance of copper increases while that of germanium decreases (d) Resistance of copper decreases while that of germanium increases

A steady electric current is flowing through a cylindrical conductor.

The angle between magnetic meridian and geographical meridian is called :

If the current is doubled, the deflection is also doubled in:

1. A tangent galvanometer.
2. A moving-coil galvanometer.
3. Both.
4. None.

What is the space around a current-carrying conductor, in which its magnetic effect can be experienced called?