CBSE 12 Physics Question Paper-2025 Set-4

Two identical point charges are placed at the two vertices A and B of an equilateral triangle of side l. The magnitude of the electric field at the third vertex P is E. If a hollow conducting sphere of radius (l/4) is placed at P, the magnitude of the electric field at point P now becomes

A coil of an ac generator with 100 turns and each turn of area 0.1 m^2 rotates half a revolution per second in a magnetic field of 0.02 T. The maximum emf generated in the coil is -

Atomic spectral emission lines of hydrogen atom are incident on a zinc surface. The lines which can emit photoelectrons from the surface are members of

The energy of an electron in a hydrogen atom in ground state is -13.6 eV. The energy of the electron when it makes a transition to a state where its kinetic energy is 1.7 eV, is -

In a p-type Si-semiconductor, an acceptor atom is added on an average of one atom per 5 x 10^7 silicon atoms. If the number density of silicon atoms in the sample is 5 x 10^28 atoms per cubic meter, the number of holes per cubic centimeter created by doping in the sample will be -

Two monochromatic waves of intensity I and 4I interfere. The ratio of maximum to minimum intensity in the resulting wave is -

The total energy of an electron in the ground state of a hydrogen atom is -13.6 eV. What will be the total energy of the electron when it makes a transition to a state where its kinetic energy is 1.7 eV?

In a p-type Si-semiconductor, an acceptor atom is added on an average of one atom per 5 x 10^7 silicon atoms. If the number density of silicon atoms in the sample is 5 x 10^28 atoms per cubic meter, the number of holes per cubic centimeter created by doping in the sample will be -

Two light waves of intensity I each, interfere at a point on the screen where the path difference is λ/8. The intensity at this point will be -

In a diffraction experiment, the slit is illuminated by light of wavelength 600 nm. The first minimum of the diffraction pattern falls at θ = 30°. The width of the slit will be -

Two identical point charges are placed at the two vertices A and B of an equilateral triangle of side l. The magnitude of the electric field at the third vertex P is E. If a hollow conducting sphere of radius (l/4) is placed at P, the magnitude of the electric field at point P now becomes

A coil of an ac generator with 100 turns and each turn of area 0.1 m^2 rotates half a revolution per second in a magnetic field of 0.02 T. The maximum emf generated in the coil is -

Atomic spectral emission lines of hydrogen atom are incident on a zinc surface. The lines which can emit photoelectrons from the surface are members of

The energy of an electron in a hydrogen atom in ground state is -13.6 eV. The energy of the electron when it makes a transition to a state where its kinetic energy is 1.7 eV, is -

In a p-type Si-semiconductor, an acceptor atom is added on an average of one atom per 5 x 10^7 silicon atoms. If the number density of silicon atoms in the sample is 5 x 10^28 atoms per cubic meter, the number of holes per cubic centimeter created by doping in the sample will be -

Two monochromatic waves of intensity I and 4I interfere. The ratio of maximum to minimum intensity in the resulting wave is -

The total energy of an electron in the ground state of a hydrogen atom is -13.6 eV. What will be the total energy of the electron when it makes a transition to a state where its kinetic energy is 1.7 eV?

In a p-type Si-semiconductor, an acceptor atom is added on an average of one atom per 5 x 10^7 silicon atoms. If the number density of silicon atoms in the sample is 5 x 10^28 atoms per cubic meter, the number of holes per cubic centimeter created by doping in the sample will be -

Two light waves of intensity I each, interfere at a point on the screen where the path difference is λ/8. The intensity at this point will be -

In a diffraction experiment, the slit is illuminated by light of wavelength 600 nm. The first minimum of the diffraction pattern falls at θ = 30°. The width of the slit will be -