List of top Physics Questions asked in MHT CET

Determine the ratio of the speed of sound in Oxygen to that in Hydrogen at the same temperature.

Find the equivalent resistance between two opposite corners of a cube made of wires, each having resistance \(R\).

Calculate the de-Broglie wavelength of an electron accelerated through a potential difference of \(100\text{ V}\).

A gas having \(\gamma = \frac{5}{2}\) and volume 360 cc is suddenly compressed to 90 cc. If the initial pressure of the gas is \(P\), find the final pressure.

Find the heat energy that must be supplied to 14 g of nitrogen at room temperature to raise its temperature by \(48^\circ\text{C}\) at constant pressure. (Molecular weight of nitrogen = 28; \(R\) is the gas constant; \(C_p = \frac{7}{2}R\) for a diatomic gas.)

A particle starts oscillating simple harmonically from its mean position with time period \(T\). At time \(t = \frac{T}{6}\), find the ratio of potential energy to kinetic energy of the particle.

An air column is of length 17 cm. Find the ratio of the frequency of the 5th overtone when the column is closed at one end to that when it is open at both ends. (Speed of sound in air = 340 m/s.)

A ball is dropped on the floor from a height of \(20 \text{ m}\). It rebounds to a height of \(5 \text{ m}\). Ball remains in contact with floor for \(1 \text{ s}\). The average acceleration during contact is (\(g = 10 \text{ m/s}^2\))

Two long parallel wires carry currents \( I_1 \) and \( I_2 \) (\( I_1 > I_2 \)). When currents are flowing in the same direction, the magnetic field at a point midway between the wires is \( 6 \times 10^{-6} \, \text{T} \). If the direction of \( I_2 \) is reversed, the field at the midpoint becomes \( 3 \times 10^{-5} \, \text{T} \). The ratio \( I_1 : I_2 \) is

Heat is given to an ideal gas in an isothermal process. Then

A parallel plate capacitor has plate area 50 cm\(^2\) and plate separation 3 mm. The space between the plates is filled with a dielectric medium of thickness 1 mm and dielectric constant 4. The capacitance becomes ( \( \epsilon_0 \) = permittivity of free space)

When a light of wavelength \( \lambda \) falls on the emitter of a photocell, maximum speed of emitted photoelectrons is \( v \). If the incident wavelength is changed to \( \frac{2}{3} \lambda \), the maximum speed of emitted photoelectrons will be:

A vehicle starts from rest and accelerates along straight path at \( 2 \, \text{m/s}^2 \). At the starting point of the vehicle, there is a stationary electric siren. How far has the vehicle nearly gone when the driver hears the siren at 94% of its value when the vehicle was at rest? (speed of sound = 220 m/s)

A pendulum bob has a speed of 4 m/s at its lowest position. The pendulum is 1 m long. When the length of the string makes an angle of 60° with the vertical, the speed of the bob at that position is (acceleration due to gravity, \( g = 10 \, \text{m/s}^2, \cos(60^\circ) = 0.5) \)

What is the phase difference between the flux linked with a coil rotating in a uniform magnetic field and the induced e.m.f. produced in it?

The temperature of an ideal gas is increased from 100 K to 400 K. If \( v \) is the R.M.S. velocity of its molecules at 100 K, it becomes

If an ammeter is to be used in place of a galvanometer, then we must connect

Moment of inertia of a thin uniform rod rotating about the perpendicular axis passing through its centre is \( I \). If the same rod is bent in the form of a ring, its moment of inertia about the diameter is \( I' \). If \( I_1 = I_2 \), then the value of \( x \) is

A plano-convex lens fits exactly in to a plano-concave lens. Their plane surfaces are parallel to each other. Lenses are made up of different materials of refractive indices \( n_1 \) and \( n_2 \) and \( R \) is the radius of curvature of the curved surface of lenses. Focal length of the combination is

The length of the simple pendulum is made 3 times the original length. If \( T \) is its original time period, then the new time period will be

A parallel plate capacitor having plate area \( A' \) and separation \( d' \) is charged to a potential difference \( V \). The charging battery is disconnected and the plates are pulled apart to four times the initial separation. The work required to increase the distance between the plates is

In an electrical circuit \( R, L, C \) and an a.c. voltage source are all connected in series. When \( L' \) is removed from the circuit, the phase difference between the voltage and the current in the circuit is \( \frac{3}{4} \). If instead \( C' \) is removed from the circuit, the phase difference is again \( \frac{3}{4} \). The power factor of the circuit is

Water flows through a horizontal pipe of varying cross-section at the rate of \( \pi \times 10^{-1} \, \text{m}^3/\text{s} \). The velocity of water at a point where the radius of the pipe is 10 cm is \( (\pi = 3.14) \)

If the internal resistance of the cell is negligible, then the current flowing through the circuit is