CBSE 12 Physics Question Paper-2023 Set-4

Two charges q₁ and q₂ are placed at the centres of two spherical conducting shells of radius r₁ and r₂ respectively. The shells are arranged such that their centres are d[>(r₁+r₂)] apart. The force exerted by q₁ on q₂ is:

An electron enters a uniform magnetic field with a speed v. It leaves the field after traversing a semicircular path. The final speed of the electron is:

The magnetic field lines near a material are as shown in the diagram. This material is:

The variation of current (I) with time (t) for four devices P, Q, R, and S is shown in the diagram. Which of these devices has an alternating current flowing through it?

In a Young's double-slit experiment, the fringe width is β. If the entire apparatus is immersed in a liquid of refractive index μ, the new fringe width will be:

An electron enters a uniform magnetic field with speed v. It describes a semicircular path and comes out of the field. The final speed of the electron is:

In a Young's double-slit experiment, the fringe width is β. If the entire apparatus is immersed in a liquid of refractive index μ, the new fringe width will be:

A proton and a deuteron, with the same kinetic energy, enter a region of uniform magnetic field B, moving perpendicular to B. The ratio of the radii of their circular paths is:

An electric dipole of moment p is placed in a uniform electric field E. The maximum torque experienced by the dipole is:

If a charge q is placed at the center of a cube, the flux coming out from any one of its faces is:

The instantaneous voltage and current in an a.c. circuit are given by V = 100 sin(100t) V and I = 20 sin(100t + π/3) A. The power dissipated in the circuit is:

The ratio of minimum to maximum frequency of light emitted in Balmer series of hydrogen spectrum, in Bohr's model is:

At a certain temperature in an intrinsic semiconductor, the electrons and holes concentration is 1.5 × 10¹⁶ m⁻³. When it is doped with a trivalent dopant, hole concentration increases to 4.5 × 10²² m⁻³. In the doped semiconductor, the concentration of electrons (ne) will be:

A voltage signal is described by: v = V₀ for 0 ≤ t ≤ T/2 and v = 0 for T/2 ≤ t ≤ T for a cycle. Its rms value is:

The momentum of a photon of wavelength λ is:

In a series LCR circuit, the voltage across the resistance, capacitance, and inductance is 15 V, 20 V, and 40 V respectively. The supply voltage is:

The ratio of maximum frequency and minimum frequency of light emitted in Balmer series of hydrogen spectrum, in Bohr's model is:

An infinite uniformly charged wire produces an electric field of 18 × 10⁴ NC⁻¹ at a distance of 1.0 cm. The linear charge density on the wire is: