Nuclei — Physics STD 12 Science — Question

In an n-type silicon, which of the following statement is true:

1. Electrons are majority carriers and trivalent atoms are the dopants.
2. Electrons are minority carriers and pentavalent atoms are the dopants.
3. Holes are minority carriers and pentavalent atoms are the dopants.
4. Holes are majority carriers and trivalent atoms are the dopants.

The acceleration of a particle is zero as measured from an inertial frame of reference. Can we conclude that no force acts on the particle?

An incomplete sentence about transistors is given below:
The emitter ...... junction is ....... and the collector ..... junction is ..... The appropriate words for the dotted empty positions are, respectively.

1. 'Collector' and 'base'.
2. 'Base' and 'emitter'.
3. 'Collector' and 'emitter'.
4. 'Base' and 'base'.

How is the magnitude of magnetic field inside a solenoid?

If a graph is drawn between different potential differences applied across the ends of the conductor and their corresponding values of current, then what type of graph is obtained?

A scooter weighing 150kg together with its rider moving at 36km/ hr is to take a turn of radius 30m. What horizontal force on the scooter is needed to make the turn possible?

In the circuit shown below, the potential at point A is 100 volts. What will be the potential at point B?

In a real gas the internal energy depends on temperature and also on volume. The energy increases when the gas expands isothermally. Looking into the derivation of C_P - C_v = R, find whether C_P - C_v will be more than R, less than R or equal to R for a real gas.

A point charge Q is placed at point ‘O’ as shown in the figure. Is the potential at point A, i.e. V_A, greater, smaller or equal to potential, V_B, at point B, when Q is (i) positive, and (ii) negative charge?