Q. A charged particle oscillates about its equilibrium position with an frequency of $100MHz$. What is the frequency of electromagnetic waves produced by the oscillator?

Q. Write the name of any four waves (radiations) produced in electromagnetic spectrum.

Q. A conducting rod of length ${}^{\prime }{l}^{\prime }$ is moving with constant linear speed ${}^{\prime }{v}^{\prime }$ in a uniform magnetic field ${}^{\prime }{B}^{\prime }$. This arrangement is mutually perpendicular. Obtain the expression of motional electromotive force.

Q. A parallel plate capacitor with air has a capacity of $8pF$. Calculate the capacity of the capacitor if the distance between the plates in halved and the space between them is fully filled with a substance of dielectric constant $5$.

Q. What is wavefront? Explain laws of refraction of light on the bases of Huygens wave theory.

Q. Write Heisenberg's uncertainty principle.

Q. Why self induction is called inertia of electricity?

Q. What is lateral shift? Establish relation between focal length and radius of curvature of a mirror.

Q. What is photo electric effect? On which two factors the photo electric current depends.

Q. What is optoelectronic junction devices? Write any two names of optoelectronic junction devices.

Q. Write the name of device ${}^{\prime }{X}^{\prime }$ in the following given diagram. Explain its working making its circuit diagram.

Q. What is broadcast communication?

Q. Distinguish between modulation and demodulation.

Q. An electron, an alpha $\left(\alpha \right)$ particle and a proton have same kinetic energies. Which one of these particles has largest de Broglie wavelength?

Q. The focal lengths of an objective lens and eyepiece are $192cm$ and $8cm$ respectively in a small telescope. Calculate its magnifying power and the separation between the two lenses.

Q. Which waves normally broadcast the frequencies in ultra high frequency (UHF) range?

Q. What is logic gates? Write two names of universal logic gates.

Q. What is Ohm's law? Write any two limitations of it.

Q. A battery of electromotive force $12V$ and internal resistance $2\Omega$ is connected to a resistor. If the current of $0.5A$ is flowing through the circuit then calculate the resistance of resistor. If the circuit is closed then what will be terminal voltage of the cell?

Q. "The half life of ${}_6^{14}C$ is $5700$ years." What does it mean?

Q. Describe any two energy losses occurring in transformers. How these can be minimized?
Why electric power is transmitted at high voltage upto large distances?

Q. "Light added to light can produce darkness". Write the name of this phenomenon.

Q. Write the Rydberg formula for the spectrum of the hydrogen atom.

Q. Define Curie temperature in magnetism.

Q. Write the name of fields produced by a moving charged particles.

Q. Write the definition of refractive index of a medium.

Q. Define the activity of radioactive substances. Write its S.I. unit.

Q. Write two limitations of Bohr's model.

Q. Define 'drift velocity' of electrons in a conductor.

Q. Write one main use of Zener diode.