List of top Questions asked in UP Board XII

Profits of the last three years were Rs. 6,000, Rs. 13,000 and Rs. 8,000 respectively. Goodwill at two years' purchase of the average net profit will be.

Revaluation gains and losses are carried at the time of retirement

On dissolution of a firm, the final balance of Capital Account is transferred to

For the firm, interest on partner's drawing is a/an

In between two crossed polaroids A and B, a third polaroid C is placed in such a way that its polarising axis makes an angle \( \theta \) from the polarising axis of the polaroid A. If the intensity of the transmitted light from the polaroid A is \( I_0 \), then find out the intensity of the polarised light transmitted from the polaroid B. For which angle \( \theta \) the intensity of the transmitted light will be maximum?

Compute the electric flux linked with a surface \( \vec{A} = 2 \hat{j} \, \mathrm{m}^2 \), placed in a uniform electric field \( \vec{E} = (4 \hat{i} + 3 \hat{j}) \, \mathrm{V/m} \).

Write the formula of refraction of light through a single spherical surface. The radius of curvature of one end of a cylindrical glass (n = 1.5) rod is 2 cm. Find the position and nature of the image of the point source S. See the figure and also draw the ray diagram.

What is meant by the electric potential energy of the system of point charges? Compute the total electric potential energy of the system of charges given in the figure.

Explain the principle of Wheatstone's bridge by Kirchhoff's law. In the given circuit, there is no deflection in the galvanometer \( G \). What is the current flowing through the cell?

What are the conditions for the minimum deviation by a prism? One face (AC) of a prism of refracting angle 30° and refractive index \( \sqrt{2} \), is silvered. What should be the angle of incidence \( i \) on the surface AB, so that after refraction into the prism, the reflected ray from the silvered surface retraces its path? See the figure.

Three ac circuits are shown in the figures with equal currents. Explain with reason, if the frequency of the voltage \( E \) is increased then what will be the effect on the currents in them.

In the given circuit, find out the equivalent resistances across the points A and B when:
(i) \(V_A>V_B\), (ii) \(V_A<V_B\).

Find out the equivalent capacitance and total energy stored in the given combination of capacitors:

An a.c. voltage of peak value 20 V is connected in series with a silicon diode and a load resistance of 500 \(\Omega\). The forward resistance of the diode is 10 \(\Omega\) and the resistive voltage is 0.7 V. Find the peak current through the diode and peak voltage across the load.

What is the first law of Kirchhoff of the electrical circuit? Find out the potential difference between the ends of 2 \(\Omega\) resistor with the help of Kirchhoff's law. See the figure:

On the basis of energy band diagram in solids, explain the difference between conductor, semiconductor, and insulator. What is the need of doping in pure semiconductors? Write the value of current in the ideal diodes \( D_1 \) and \( D_2 \) in the given circuit.

State Kirchhoff's law related to electrical circuits. In the given metre bridge, balance point is obtained at D. On connecting a resistance of 12 ohm parallel to S, balance point shifts to D'. Find the values of resistances R and S.

With the help of given circuit, find out:
(i) Equivalent capacity of the combination
(ii) Charge on capacitor \(c_1\)
(iii) Total stored energy of the combination.}

With the help of the given circuit, find out the total resistance of the circuit and the current flowing through the cell.