CBSE 12 Physics Question Paper-2025 Set-1

A charge Q is fixed in position. Another charge q is brought near charge Q and released from rest. Which of the following graphs is the correct representation of the acceleration of the charge q as a function of its distance r from charge Q?

A 1 cm segment of a wire lying along x-axis carries current of 0.5 A along +x direction. A magnetic field B=(0.4 mT) j + (0.6 mT) k is switched on, in the region. The force acting on the segment is -

In the given diagram, the curved lines represent equipotential surfaces. A charge is moved along different paths A, B, C and D. Along which path is the maximum work done on the charge?

A wire of length L and radius r has resistance R. Which of the following wires of the same material will have resistance ½R?

Two wires P and Q are made of the same material. Diameter of wire Q is twice that of wire P and length of wire Q is half that of wire P. If the resistance of wire P is R, then the resistance of wire Q will be -

Two conductors A and B of the same material have their lengths in the ratio 1:2 and radii in the ratio 2:3. If they are connected in parallel across a battery, the ratio (A) 2 (C) $\frac{3}{2}$ (B) (D) $\frac{8}{9}$ of the drift velocities of electrons in them will be -

The ratio of the number of turns of the primary to the secondary coils in an ideal transformer is 20: 1. If 240 V ac is applied from a source to the primary coil of transformer and a 6.0 ohm resistor is connected across the output terminals, then current drawn by the transformer from the source will be -

A coil with diameter 15 mm and 300 turns is placed in a magnetic field of 30 mT such that the plane of the coil is perpendicular to the direction of the magnetic field. The field intensity is uniformly decreased to zero in 20 ms and then again uniformly increased to 30 mT in 40 ms. If the induced emf in the two time intervals are $e_{1}$ and $e_{2}$ respectively, the value of $e_{1}/e_{2}$ is -

In the diagram, the variation of Coulomb's force (F) with 1/r^2 is shown between two point charges. Here r is the separation between the two charges ($q_1, q_2$) and ($q_2, q_3$). If $q_2$ is positive and its magnitude is minimum then the magnitudes of $q_1, q_2$ and $q_3$ are such that:

A coil has 100 turns, each of area 0.05 $m^2$ and its total resistance is 1.5 $\Omega$. The coil is immersed in a magnetic field of 90 mT at an instant with its axis parallel to the field. At the same instant, the induced charge in the coil is -

Two conductors A and B of the same material have their lengths in the ratio 1:2 and radii in the ratio 2:3. If they are connected in parallel across a battery, the ratio of the drift velocities of electrons in them will be -

A coil with diameter 15 mm and 300 turns is placed in a magnetic field of 30 mT such that the plane of the coil is perpendicular to the direction of the magnetic field. The field intensity is uniformly decreased to zero in 20 ms and then again uniformly increased to 30 mT in 40 ms. If the induced emf in the two time intervals are $e_{1}$ and $e_{2}$ respectively, the value of $e_{1}/e_{2}$ is -

In the diagram, the variation of Coulomb's force (F) with 1/r^2 is shown between two point charges. Here r is the separation between the two charges ($q_1, q_2$) and ($q_2, q_3$). If $q_2$ is positive and its magnitude is minimum then the magnitudes of $q_1, q_2$ and $q_3$ are such that:

A coil has 100 turns, each of area 0.05 $m^2$ and its total resistance is 1.5 $\Omega$. The coil is immersed in a magnetic field of 90 mT at an instant with its axis parallel to the field. At the same instant, the induced charge in the coil is -

You have to design an air-filled solenoid of length 0.81 m and radius 0.02 m with an inductance of 0.016 H. If the average length of the turn is 0.063 m, the number of layers of windings and the number of turns per unit length respectively are -

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 $5 \times 10^{7}$ silicon atoms. If the number density of silicon atoms in the sample is $5 \times 10^{28}$ 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 $\lambda/8$. 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 $\theta = 30^{\circ}$. The width of the slit will be -

The ratio of the number of turns of the primary to the secondary coils in an ideal transformer is 20: 1. If 240 V ac is applied from a source to the primary coil of transformer and a 6.0 ohm resistor is connected across the output terminals, then current drawn by the transformer from the source will be -

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 -

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?

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

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 -

The ratio of the number of turns of the primary to the secondary coils in an ideal transformer is 20: 1. If 240 V ac is applied from a source to the primary coil of transformer and a 6.0 ohm resistor is connected across the output terminals, then current drawn by the transformer from the source will be -

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 -

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?

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

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 -