List of top Physics Questions

The net resistance of an ammeter should be small to ensure that:
In a transistor:
The electric field of intensity \( \vec{E} = (3 \hat{i} + 4 \hat{j}) \, \text{N/C} \) passes through the plane of area \( \vec{A} = (10 \hat{i}) \, \text{m}^2 \). Find the electric flux.
Define optical centre of a lens.
How much energy is released in mass defect of 1 amu?
Write the minimum orbital angular momentum of the electron in a hydrogen atom.
As compared to \(^{12}_6C\) atom, how many extra protons and neutrons does the \(^{14}_6C\) atom have?
The equivalent resistance of the network shown in figure between A and B is:
What do you understand by electromagnetic induction? State Faraday’s laws regarding electromagnetic induction.
What is LED? Explain its principle, construction and working.
As the temperature of a metal and of a semiconductor is increased, the:
The equation \( E = pc \), where \( E \), \( p \), and \( c \) represent energy, momentum, and velocity of light, is valid:
What is the meaning of wavefront? Explain the laws of reflection by explaining Huygens' principle of wavefront.
Explain both the laws of Kirchhoff of electrical circuits.
Obtain the formula for refractive index of material of prism in terms of angle of minimum deviation and angle of prism.
What is the meaning of matter-wave of Louis de Broglie? Deduce the relation for wavelength of de Broglie in terms of kinetic energy.
Derive the formula for the capacitance of a parallel plate capacitor, partially filled with a dielectric.
The energy of an electron of excited hydrogen atom is -3.4 eV. Determine the angular momentum of the electron.
What is a transistor? By drawing the circuit diagram of common emitter configuration, plot the output characteristics.
Define the formula for the resonant frequency in a series L-C-R alternating current circuit.
Explain Bohr's model of the atom.
Classify nuclei on the basis of atomic number and mass number and define them.
What are meant by ohmic and non-ohmic resistances? Draw the graph between voltage and current for a non-ohmic circuit and define dynamic resistance.
The magnifying power of a telescope is 9. When it is adjusted for parallel rays, the distance between the eye lens and objective is 20 cm. Determine the focal lengths of both the lenses.
Equiconcave lens of crown glass has to be made. How much radii of the surfaces of the lens should be kept so that its power would be -2.5 D? The refractive index of crown glass is 1.65.