12th Standard Physics March 2024: Online Practice Test

The principle based on which a solar cell operates is :

If the amplitude of the magnetic field is \(3\times10^{-6}\) T, then the amplitude of the electric field for a electromagnetic wave is :

A toaster operating at 240 V has resistance of 120 Ω. Its power is :

Atomic number of H - like atom with ionization potential 122.4 V for n = 1 is :

The transverse nature of light is shown in :

In an oscillating LC circuit, the maximum charge on the capacitor is Q. The charge on the capacitor when the energy is stored equally between the electric and magnetic field is :

A bar magnet of length 'ℓ' and magnetic moment '\(P_m\)' is bent in the form of an arc as shown in figure. The new magnetic dipole moment will be :

The speed of light in an isotropic medium depends on :

In a series RL circuit, the resistance and inductive reactance are the same. Then the phase difference between voltage and current in the circuit is :

Two identical conducting balls having positive charges \(q_1\) and \(q_2\) are separated by a center to center distance 'r'. If they are made to touch each other and then separated to the same distance, the force between them will be :

Three capacitors are connected in triangle as shown in figure. The equivalent capacitance between the points A and C is :

The threshold wavelength for a metal surface whose photoelectric work function is 3.313 eV :

Light transmitted by Nicol prism is :

The gravitational waves were theoretically proposed by :

The value of forbidden energy gap for Si at room temperature is :