List of top Physics Questions asked in UP Board XII

Derive Lens Maker's formula for a thin lens.
The peak value of an alternating current is 14.14 Amp., and its frequency is 50 Hz. Draw current-time graph for two cycles. Find r.m.s. value of current. What time will the current take to reach the peak value starting from zero ?
What is radial magnetic field ? Explain principle of moving coil galvanometer with the help of suitable diagram. How can its sensitivity be increased ?
Write Gauss's law. Derive the formula for electric field due to a linear charge distribution.
Deduce the expression of intensity of magnetic field produced inside long current carrying solenoid with the help of Ampere's law.
Find the currents in the resistors \(2 \, \Omega\) and \(10 \, \Omega\) in the network shown in figure, also find charge on the capacitor :
\includegraphics[width=0.5\linewidth]{2.png}
A metallic rod of 1.0 m length is rotating about a perpendicular axis passing through its one end with an angular frequency of 400 rad/s. The other end of the rod is in contact with a ring of metal. Magnetic field of 0.5 T is along its axis. Calculate the induced emf between the ring and the axis.
Draw (\(i - \delta\)) curve for a prism, and show angle of minimum deviation in the curve.
Find current through the battery in the circuit shown in fig :
\includegraphics[width=0.5\linewidth]{1.png}
Explain Nuclear fusion.
What is total internal reflection?
Write Kirchhoff's laws related to electric circuit by drawing suitable circuit diagram.
Write equation of energy of photon in terms of Planck's constant (h) and wavelength (\(\lambda\)).
Define work-function.
When an impurity is doped in a pure semiconductor, the conductivity of the semiconductor
Write the unit of specific resistance.
A current of 10 A is flowing in a long wire along the positive Z-axis. Find the intensity of magnetic field at a point (10 cm, 0, 0).
Write Lenz's law.
A free electron is placed in the path of a plane electromagnetic waves. The electron will start moving
A double convex lens has radius of curvature R of each surface and refractive index of its material is \(\mu = 1.5\). We have
The peak voltage in a 220 volt A.C. source is
An electron projected towards East is deflected towards North by a magnetic field. The direction of magnetic field may be
A charge q is placed at the centre of the open end of a cylindrical vessel. The flux of the electric-field through the surface of the vessel is
Describe the atomic model of Rutherford. How did Bohr model removed its drawbacks?
Same current in same direction is flowing in two parallel wire with 0.06 metre distance apart with each other. The attractive force per metre length of \(3 \times 10^{-3}\) newton is working between the two. Determine the value of current flowing in each wire.