List of top Physics Questions asked in MHT CET

At constant pressure, which of the following is true ?
Direction of magnetic field at equatorial point is
The displacement of a particle performing simple harmonic motion is given by, x=8sin$\omega t+6cos \omega t$, where distance is in cm and time is in second. The amplitude of motion is
The minimum phase difference between two simple harmonic oscillations, $ \, \, \, \, \, \, \, \, y_1 =\frac{1}{2}sin \omega t +\frac{\sqrt 3}{2} cos \omega t$ $ \, \, \, \, \, \, \, \, \, \, \, y_2 =sin \omega t +cos \omega t$ is
Two light rays having the same wavelength $\lambda$ in vacuum are in phase initially. Then the first ray travels a path $L_1$ through a medium of refractive index $n_1$ while the second ray travels a path of length $L_2$ through a medium of refractive index $n_2$. The two waves are then combined to produce interference. The phase difference between the two waves is
Turning effect is produced by
A thick wire is stretched, so that its length become two times. Assuming that there is no change in its density, then what is the ratio of change in resistance of wire to the initial resistance of wire?
In Melde's experiment, the string vibrates in 4 loops when a 50 g weight is placed in the pan of weight 15 g. To make the strings to vibrates in 6iJoops the weight that has to be removed from the pan is
The time period of a particle in simple harmonic motion is 8 second. At t = 0 it is at the mean position. The ratio of the distances travelled by it in the first and second seconds is:
A galvanometer of 100 $ \Omega $ resistance gives full scale deflection with 0.01 A current. How much resistance should be connected to convert it into an ammeter of range , 10 A :
A transformer is used to light a 100W and 110V lamp from 220V mains. If the main current is 0.5 amp, the efficiency of the transformer is approximately:
A ray of light passes through a glass slab with refractive index \( n = 1.5 \) at an angle of incidence of \( 30^\circ \). What is the angle of refraction inside the glass? (Use \( \sin 30^\circ = 0.5 \))
A spherical object of radius \( R \) is placed in a uniform electric field \( E \). If the dielectric constant of the material of the object is \( K \), find the induced charge on the surface of the object.
A body of mass 5 kg is initially at rest on a smooth horizontal surface. A constant force of 20 N is applied to the body. Find the acceleration of the body and the distance traveled by the body in 10 seconds.
A body oscillates with simple harmonic motion with an amplitude of 2 cm and a period of 4 seconds. What is the maximum speed of the body?
A magnetic field of strength \( B = 2 \, \text{T} \) is applied perpendicular to a current-carrying conductor. If the current in the conductor is \( I = 3 \, \text{A} \) and the length of the conductor within the magnetic field is \( L = 1.5 \, \text{m} \), calculate the force acting on the conductor.
What is the entropy change when 1.0 kg of water at \( 100^\circ C \) is converted to steam at the same temperature? The latent heat of vaporization of water is \( 2.25 \times 10^6 \, \text{J/kg} \).
What is the wavelength of a sound wave that has a frequency of \( 500 \, \text{Hz} \) and travels at a speed of \( 343 \, \text{m/s} \)?
A current of \( 2.0 \, \text{A} \) is passed through a conductor for \( 10 \, \text{minutes} \). How much charge passes through the conductor?
A radioactive substance has a half-life of \( 10 \, \text{hours} \). If the initial amount of the substance is \( 200 \, \text{g} \), how much of the substance remains after \( 30 \, \text{hours} \)?
A capacitor of capacitance \( 10 \, \mu\text{F} \) is charged to a potential difference of \( 100 \, \text{V} \). What is the energy stored in the capacitor?
A 1.0 kg sample of water at \( 80^\circ C \) is placed in thermal contact with a 2.0 kg sample of water at \( 20^\circ C \). If the system is insulated, what will be the final equilibrium temperature of the system? Assume no heat loss to the surroundings, and the specific heat capacity of water is \( 4.18 \, \text{J/g}^\circ \text{C} \).
In an electromagnetic wave traveling in a vacuum, the electric field amplitude is \( 3.0 \times 10^3 \, \text{V/m} \). What is the magnetic field amplitude of the wave? Assume the speed of light in vacuum is \( c = 3.0 \times 10^8 \, \text{m/s} \).
A photon has an energy of \( 5.0 \, \text{eV} \). What is its wavelength? (Planck's constant \( h = 6.626 \times 10^{-34} \, \text{J} \cdot \text{s} \), speed of light \( c = 3.0 \times 10^8 \, \text{m/s} \))
In a semiconductor, the intrinsic carrier concentration is \( 1.5 \times 10^{10} \, \text{cm}^{-3} \) at room temperature. If the energy band gap of the semiconductor is \( 1.1 \, \text{eV} \), calculate the intrinsic carrier concentration at a temperature of \( 500 \, \text{K} \). The intrinsic carrier concentration at room temperature (\( 300 \, \text{K} \)) is known to vary with temperature according to the relation: \[ n_i(T) = n_{i0} \left( \frac{T}{T_0} \right)^{3/2} \exp \left( -\frac{E_g}{2k} \left( \frac{1}{T} - \frac{1}{T_0} \right) \right) \] Where: - \( n_{i0} = 1.5 \times 10^{10} \, \text{cm}^{-3} \), - \( T_0 = 300 \, \text{K} \), - \( E_g = 1.1 \, \text{eV} \), - \( k = 8.617 \times 10^{-5} \, \text{eV/K} \), - \( T = 500 \, \text{K} \).