List of top Questions asked in UP Board XII

Explain the meaning of binding energy of a nucleus. Write the dependency of binding energy per nucleon on the mass number of the nucleus.
Give pictorial representation of polarized and unpolarised light. Polarizing angle for a transparent medium is 60°. Find the value of angle of refraction and refractive index of the medium.
Name the waves of longest wavelength and highest frequency in the given electromagnetic waves — microwaves, X-rays, radio waves, and \(\gamma\)-rays. What is meant by displacement current?
What is the meaning of stationary orbit of atom? Deriving formula for the energy of the electron in the stationary orbit of the hydrogen atom, mention its relation with the radius of the orbit of electron.
With the help of the given circuit, find out the total resistance of the circuit and the current flowing through the cell.
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On connecting a cell of e.m.f. 0.5 volt with an external resistance of 1.9 $\Omega$, the current flowing is 0.75 A. The internal resistance of the cell is:
Write down Einstein's equation for the photoelectric effect.
Write de-Broglie formula for the wavelength of matter waves.
Equation of electric field of a plane electromagnetic wave is given as:
\[ E_z = 60 \sin(500x + 1.5 \times 10^{11} t) \, \text{V/m}. \] Write the equation for the magnetic field of the wave.
In an alternating circuit, the reading of the voltmeter is 220 V. Write the peak value of the voltage.
Do two equipotential surfaces intersect each other? Answer with reason.
On which principle does a nuclear reactor work?
Electrostatic force between two point charges placed in a medium of dielectric constant \( k \) is \( F_1 \). On changing the medium, electrostatic force between the charges becomes \( F_2 \). Dielectric constant of the medium will be:
A concave lens of focal length -18 cm is placed in contact with a convex lens of focal length +12 cm. The focal length of the combination will be:
Resistance of an ideal p-n junction diode in reverse bias is:
Resistivity of a conducting wire depends on:
A charge \( q \) enters with speed \( v \) in the direction of magnetic field \( B \). The force on the charge in magnetic field will be:
Discuss the effect of change in Aggregate Demand on Income and Output. OR Calculate Gross Value Added at Market prices of a Firm from the following data: Sales: Rs. 100 Lakh, Purchase: Rs. 40 Lakh, Opening Stock: Rs. 20 Lakh, Closing Stock: Rs. 25 Lakh
Explain Law of Diminishing Returns with the help of an example and diagram.
Differentiate between Fiscal Deficit and Primary Deficit.
Discuss the difference between Balance of Payment and Balance of Trade.
Explain consumer's equilibrium by utility analysis. OR When the price of a commodity decreases from Rs. 5 per unit to Rs. 4 per unit, its demand increases from 100 units to 110 units. Calculate elasticity of demand.
Explain Total Revenue, Average Revenue and Marginal Revenue with the help of a diagram. OR How are quantity and price determined under perfect competition? Explain.
What is meant by "Effective Demand"?
What is "Exchange Rate"?