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UP Board XII
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Physics
List of top Physics Questions asked in UP Board XII
Explain p-n-p transistor as a common emitter amplifier. What are the gains in it?
UP Board XII - 2023
UP Board XII
Physics
Semiconductor electronics: materials, devices and simple circuits
State the conditions of interference of light. Obtain the expression for the fringe width in Young's double slit experiment.
UP Board XII - 2023
UP Board XII
Physics
Wave Optics
In the given circuit, calculate:
i) Current
ii) Voltage across the resistor
iii) Phase difference between L and C
UP Board XII - 2023
UP Board XII
Physics
Alternating Current Circuits
Find the angle of minimum deviation for an equilateral prism made of refractive index \( 1.732 \). What is the angle of incidence for the deviation?
UP Board XII - 2023
UP Board XII
Physics
Ray optics and optical instruments
A diverging lens of focal length 20 cm and a converging lens of focal length 30 cm are placed 15 cm apart with their principal axes coinciding. Where should an object be placed on the principal axis so that its image is formed at infinity?
UP Board XII - 2023
UP Board XII
Physics
Ray optics and optical instruments
Draw a suitable ray diagram of a compound microscope, when the image is formed at the least distance of distinct vision. Find the expression of magnifying power in this case.
UP Board XII - 2023
UP Board XII
Physics
Ray optics and optical instruments
Find the expression of the capacity of the parallel plate capacitor partly filled with dielectric substance. If the capacitor is charged by 100 μC and dielectric constant of the slab putting in it is 2.0, then find the induced charge on the dielectric slab in the capacitor.
UP Board XII - 2023
UP Board XII
Physics
Electrostatics
Explain the classification of conductors, insulators, and semiconductors on the basis of energy bands.
UP Board XII - 2023
UP Board XII
Physics
Semiconductor electronics: materials, devices and simple circuits
Write the principle of Wheatstone's Bridge. Find the current measured by the ammeter in the given circuit diagram.
UP Board XII - 2023
UP Board XII
Physics
Current electricity
A metallic stick of length \( L \) confined in a plane is rotated in its own plane with angular velocity \( \omega \) in a uniform magnetic field \( \vec{B} \) exists in the region. Find the expression of emf induced between the ends of the stick.
UP Board XII - 2023
UP Board XII
Physics
Electromagnetic induction
The electric field in an electromagnetic wave is given by \( E = 50 \sin \left( \omega t - \frac{x}{c} \right) \, \text{N/C}\). Find the energy contained in a cylinder of cross-section \( 10 \, \text{cm}^2 \) and length 50 cm along the x-axis.
UP Board XII - 2023
UP Board XII
Physics
Electromagnetic waves
Calculate the energy of a \( \text{He}^+ (Z = 2) \) in its first excited state.
UP Board XII - 2023
UP Board XII
Physics
Atoms
Define critical angle. Explain working of optical fibre.
UP Board XII - 2023
UP Board XII
Physics
Ray optics and optical instruments
Obtain the formula for the electric potential on the axial line of an electric dipole.
UP Board XII - 2023
UP Board XII
Physics
Electrostatics
Define drift velocity of free electrons and write the relation between drift velocity and current density.
UP Board XII - 2023
UP Board XII
Physics
Current electricity
What are matter waves? Write de Broglie equation.
UP Board XII - 2023
UP Board XII
Physics
Dual nature of radiation and matter
Draw the logic symbol of a NOR gate and write its truth table.
UP Board XII - 2023
UP Board XII
Physics
Logic gates
The work function of a metal is \( 2.5 \times 10^{-9} \) joule. If the metal is exposed to a light beam of frequency \( 6.0 \times 10^{14} \) Hz, what will be the stopping potential?
UP Board XII - 2023
UP Board XII
Physics
Photoelectric Effect
Explain Biot-Savart law and find the unit of \( \mu_0 \) with the help of the Biot-Savart equation.
UP Board XII - 2023
UP Board XII
Physics
Moving charges and magnetism
Define optical centre of a lens.
UP Board XII - 2023
UP Board XII
Physics
Ray optics and optical instruments
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.
UP Board XII - 2023
UP Board XII
Physics
Electrostatics
In a transistor:
UP Board XII - 2023
UP Board XII
Physics
Semiconductor electronics: materials, devices and simple circuits
The net resistance of an ammeter should be small to ensure that:
UP Board XII - 2023
UP Board XII
Physics
Current electricity
Write the minimum orbital angular momentum of the electron in a hydrogen atom.
UP Board XII - 2023
UP Board XII
Physics
Bohr Model Of The Hydrogen Atom
As compared to \(^{12}_6C\) atom, how many extra protons and neutrons does the \(^{14}_6C\) atom have?
UP Board XII - 2023
UP Board XII
Physics
Nuclei
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