MAH-MHT CET (PCM/PCB) entrance exam Question Bank Solutions for Physics

A spring of force constant of 400 N/m is loaded with a mass of 0.25 kg. The amplitude of oscillations is 4 cm. When mass comes to the equilibrium position. Its velocity is ______.

A series L-C-R circuit is connected to a source of alternating emf of 50 V and the potential difference across inductor and capacitor is 90 V and 60 V, respectively. The potential difference across the resistor is ______.

A particle of mass 5 kg moves in a circle of radius 20 cm. Its linear speed at a time t is given by v = 4t, t is in the second and v is in ms^-1. Find the net force acting on the particle at t = 0.5 s.

The readings of the ammeter and voltmeter in the given circuit are respectively.

Let E_e and E_p represent the kinetic energy of electron and photon, respectively. If the de-Broglie wavelength λ_p of a photon is twice the de-Broglie wavelength λ_e of an electron, then `E_p/E_e` is ______.

(speed of electron = `c/100`, c = velocity of light)

A potentiometer wire AB having length L and resistance 12r is joined to a cell D of emf ε and internal resistance r. A cell C having emt `ε/2` and internal resistance 3r is connected. The length AJ at which the galvanometer as shown in the figure shows no deflection is ______.

Ultraviolet light of wavelength 300 nm and intensity 1.0 Wm⁻² falls on the surface of a photosensitive material. If one percent of the incident photons produce photoelectrons, then the number of photoelectrons emitted from an area of 1.0 cm² of the surface is nearly ______.

An AC source of voltage V = (100 sin 100πt) V is connected to a resistor of resistance 20 Ω. The rms value of current through resistor is ______.

The displacement of a particle of mass 3 g executing simple harmonic motion is given by Y = 3 sin (0.2 t) in SI units. The kinetic energy of the particle at a point which is at a distance equal to `1/3`​ of its amplitude from its mean position is ______.

In Bohr’s atomic model, speed and time period of revolution of an electron in n = 3 level are respectively.

A body of mass 0.5 kg travels in a straight line with velocity v = ax^3/2 where a = 5 m^–1/2s^–1. The change in kinetic energy during its displacement from x = 0 to x = 2 m is ______.

If a gas is compressed adiabatically:

When monochromatic light of frequency v₁ falls on a metal surface, the stopping potential required is found to be V₁. If the radiation of frequency v₂ is incident on the surface, the stopping potential required V₂ is ______. (v₂ > v₁)

In the given figure, a = 15 m/s² represents the total acceleration of a particle moving in the clockwise direction on a circle of radius R = 2.5 m at a given instant of time. The speed of the particle is ______.

Two wires of different materials have same length L and same diameter d. The second wire is connected at the end of the first wire and forms one single wire of double the length. This wire is subjected to stretching force F to produce the elongation l. The two wires have ______.

When wavelength of light used in optic I instruments A and Bare 4500 Å and 6000 Å respectively, the ratio of resolving pow of A to B will be ______.

Refractive index of the medium isµ and wavelength is λ, then which of the following proportionality relation is correct?

Two parallel SHMs have equations y₁ = a₁ sin(ωt + 2π) and y₂ = a₂ sin(ωt + 4π). The amplitude of the resultant is ______

In a p-type semiconductor, the acceptor impurity produces an energy level ______

The number of molecules in 100 cc of gas at N.T.P. is ______ if the mass of each molecule is 4.556 x 10^-25 kg and R.M.S. speed is 250 m/s.