Bihar Board Class 12 Physics Question Paper PDF with Solutions is available for download. The Bihar School Examination Board (BSEB) conducted the Class 12 examination for a total duration of 3 hours 15 minutes, and the Bihar Board Class 12 Physics question paper was of a total of 100 marks.
Bihar Board Class 12 Physics 2025 Question Paper with Solutions Set D
| Bihar Board Class 12 Physics 2025 Question Paper with Answer Key Set D | Download PDF | Check Solutions |
Two equal positive point charges of \(1~\mu C\) charge are kept at a distance of \(1~metre\) in air. The electric potential energy of the system will be
Which one of the following is unit of capacity?
The capacity of any condenser does not depend upon
The electric field on the outer surface of a charged conductor is
If a conductor is placed in an external electric field, the field inside the conductor will be
Which of the following statements is true for two point charges of opposite sign?
Gauss’s law states that the electric flux through a closed surface is
Kilowatt-hour (kWh) is the unit of
Which of the following laws is based on the principle of energy conservation?
When an ammeter is shunted then its measurement limit
Dimensional formula of permeability is
Unit of \(\sqrt{\dfrac{\mu_0}{\varepsilon_0}}\) is
If the number of turns is increased in any moving coil galvanometer, then its sensitivity
At neutral points
The peak value of an alternating current is \(10~A\). Its root mean square value will be
In a purely inductive circuit, the power factor is
In an a.c. circuit containing only capacitor, the phase difference between current and voltage is
In resonance condition, the frequency of \(L-C\) circuit is
In a step-up transformer, the value of current in secondary compared to the primary coil is
Image formed by convex mirror is always
If the critical angle for total internal reflection from any medium to vacuum is 30°, then the velocity of light in the medium is
The distance between two charges is made half and one of the charges is also halved. The force acting between the two will become as compared to previous value
The speed of an electron accelerated from rest under a potential difference \(V\) is
The specific charge of electron is
In parallel combination of condensers, which quantity remains same for each condenser?
On inserting a dielectric material between two positive charges in air, the value of repulsive force will
The distance between two equal and opposite charges of 0.2 C is 3.0 cm. Their electric dipole moment will be
Inside a closed surface, \(n\) electric dipoles are situated. The electric flux coming out from the closed surface will be
Two light waves of equal amplitude and equal wavelengths are superimposed. The amplitude of the resultant wave will be maximum when the phase difference between them is
In polarised light, the angle between plane of vibration and plane of polarization is
Which of the following is not an electromagnetic wave?
The speed of electromagnetic wave in any material medium does not depend
In the phenomenon of photoelectric emission, on increasing the intensity of incident light, the photoelectric current
The wavelength of de Broglie wave associated with any moving particle does not depend on
The formula of kinetic mass of photon is
If two converging lenses of equal focal length \(f\) are kept in contact, then the focal length of the combination will be
Power of a convex lens is 2 dioptre. Its focal length will be
Which of the following is used to reduce chromatic aberration in lenses?
A convex lens is dipped in a liquid, whose refractive index is equal to the refractive index of the material of the lens. Then its focal length will
The bubble of soap appears coloured due to
Which of the following cannot be polarized?
A person uses spectacles (lens) of +2D power. His defect of vision is
When boron is mixed as impurity in silicon, the resultant matter is
In n-type semiconductor the minority charge carrier is/are
Which logic gate's output is true only if the inputs are different?
Reverse biased diode is
Boolean expression of NAND gate is
What type of wave is used in fibre optic communication?
Which one of the following frequency ranges is used for TV transmission?
What is the main difference between isotopes of the same element?
Which one of the following is not a type of radioactive decay?
What is the energy of a photon with a wavelength of 500 nm? (Use \( c = 3 \times 10^8 \, m/s \) and \( h = 6.626 \times 10^{-34} \, Js \))
Which series of hydrogen spectrum lies in visible portion?
Which of the following is a chargeless particle?
X-rays are
Equivalent energy of 1 amu is
A capacitor of \( 100 \, \mu F \) is charged to 100 volt. The energy stored in it will be
Which of the following has unit volt-metre\(^{-1}\)?
The relation between drift velocity \(v\) of free electrons in conductor in electric conduction and potential difference \(V\) between ends of conductor is
The graph between voltage \(V\) of a conductor and current \(I\) is a straight line which makes an angle \(\theta\) with y-axis (which represents \(I\)). The resistance of the conductor will be
Power of electric circuit is
With the rise in temperature, the resistance of semiconductor
Which of the following represents resistance, \( R \)? (\( \rho \) = resistivity, \( l \) = length of a material, \( A \) = cross-sectional area)
The relative permeability (\( \mu_r \)) of ferromagnetic substance is
In a series circuit with resistors \( R_1, R_2, \) and \( R_3 \), the current flowing through each resistor is
The unit of current density is
If the length of a conductor is doubled while keeping the potential difference across it constant, then the drift velocity of electrons will
The direction of magnetic field inside a current-carrying solenoid is
Which of the following devices is based on the principle of electromagnetic induction?
The self-inductance of a solenoid depends on
What do you mean by power of accommodation of eye?
Explain electrical resonance.
The applied voltage in an alternating circuit is \(220\ V\). If \(R = 8\ \Omega\) and \(X_L = X_C = 6\ \Omega\), then find the root mean square value of voltage and the impedance of the circuit.
How does the refractive index of any medium depend upon the wavelength of light?
What is Curie temperature?
Write two properties of paramagnetic substance.
Convert decimal numbers 21 and 43 into their equivalent binary numbers.
Write down the difference between nuclear fission and nuclear fusion.
Write the necessary conditions for total internal reflection of light.
Write Fleming's left hand rule.
Write down two basic differences between interference and diffraction.
Compare the magnetic properties of steel and soft iron.
Mention the two characteristic properties of the material suitable for making core of a transformer.
A proton and an electron have the same kinetic energy. Which one has the greater de Broglie wavelength and why?
Define volume density of charge. Write its SI unit.
Explain magnetic moment. Write its SI unit.
Write two properties of beta (\(\beta\)) rays.
Explain Bohr’s stable orbit.
An electric dipole is held in a uniform electric field. The dipole is aligned parallel to the electric field. Find the work done in rotating it through an angle of \(180^\circ\).
Mention two different modes of propagation used in communication system.
State and prove Gauss’s theorem in electrostatics. Calculate the electric field intensity at a point outside a hollow uniformly charged sphere.
State Kirchhoff’s laws and use them to obtain the condition for balance of a Wheatstone bridge.
Define wavefront and secondary wavelets. Verify the law of reflection on the basis of Huygens’ wave theory.
What is equivalent lens? Derive an expression for equivalent focal length of two lenses of focal lengths \(f_1\) and \(f_2\) kept at a distance \(d\).
Define self-inductance and mutual inductance. Find an expression for mutual inductance of two coaxial solenoids.
What is photoelectric effect? What are the laws of photoelectric effect? Explain this law given by Einstein.
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