List of practice Questions

What are eddy currents? Give two applications of it.
What is electromagnetic induction? Give names of two devices based on it.
Explain why:
[(i)] Lighter nuclei fuse together to form a heavy nucleus.
[(ii)] A heavy nucleus splits into two lighter nuclei.
[(iii)] Energy is released in both phenomenon of nuclear fission and nuclear fusion.
What is $Q$-value of a nuclear reaction? Find (i) nature, (ii) $Q$-value, and (iii) mass defect of nuclear reaction: \[ 2({}^1H^2) \; \longrightarrow \; {}^4He^2 + g \] if the binding energy per nucleon of deuterium and helium are $1.25 \, \text{MeV}$ and $7.2 \, \text{MeV}$ respectively.
On what factors does the internal resistance of a cell depend?
Draw circuit diagram of Wheatstone’s bridge. Which are its conjugate arms?
What is meant by shunt and mention its one use in electrical circuit?
Two lenses of powers +5D and –3D are placed in contact. Find (i) the focal length and (ii) the power of the combined lens.
A metal has work function of 2.0 eV and is illuminated by monochromatic light of wavelength 5000 \AA. Calculate (i) the threshold wavelength and (ii) the stopping potential.
Compare the features of (i) forward biased and (ii) reverse biased p-n junction. Mention the nature of biasing in solar cell.
Show that $\left(\dfrac{\text{Henry}}{\text{Farad}}\right)^{1/2}$ represents resistance.
In the given circuit, calculate the current in each resistance.
Which colour of light has minimum deviation after passing white light through a prism?
The difference in angular momentum of electrons between two successive orbits of hydrogen atom is:
The field produced around current carrying conductor is:
State limitations of the formula for the refraction of light on a spherical surface: \[ \frac{n_1}{u} + \frac{n_2}{v} = \frac{n_2 - n_1}{R} \] where symbols have their usual meanings.
Why LED is kept in forward biased condition?
Find the refractive index of material of a prism, if the angle of prism and the angle of minimum deviation are equal to $A$.
Electric and magnetic field vectors of an EM wave are $\vec{E}$ and $\vec{B}$ respectively. Find the direction of propagation.
What is the principle of a transformer?
Explain the working of oscillating process of a transistor, with the help of circuit diagram.
Explain the full-wave rectification process of p-n junction diode, with the help of a circuit diagram.
Obtain the formula for the distance of $n^{th}$ order dark fringe from the central fringe with the help of Young’s double-slit experiment.
What is Huygens’ wave theory? Enunciate Snell’s law of refraction of light by using this theory.
From the given A.C. circuit, find out:
Inductive and capacitive reactance
Frequency of the applied voltage in the state of resonance
Impedance of the circuit in resonance stage