List of top Physics Questions asked in MHT CET

Two vessels separately contain two ideal gases A and B at the same temperature. The pressure of A is twice that of B. Under such conditions, the density of A is found to be 1.5 times the density of B. The ratio of molecular weights of A and B is:

Which one of the following is a unit vector?

The radiations of energies 1eV and 2.5eV are incident on a metal surface having work function 0.5 eV. The ratio of the maximum velocities of the emitted photo-electrons is:

Magnetic induction at a point along the axis of a bar magnet is equal to magnetic induction at a point along the equator. The ratio of the distance along the axis to distance along equator is:

A transistor is connected in C-E mode. If collector current is \( 72 \times 10^{-5} \, \text{A} \) and \( \alpha = 0.96 \), then base current will be:

The excess pressure inside a soap bubble of volume \( V \) is three times the excess pressure inside a second soap bubble of volume \( V_1 \). The value of \( \left( \frac{V}{V_1} \right) \) is:

The gravitational potential energy of a rocket of mass 200 kg at a distance \( 10^6 \, \text{m} \) from the centre of the earth is \( 3 \times 10^8 \, \text{J} \). The weight of the rocket at a distance \( 10^7 \, \text{m} \) from the centre of the earth is:

The wave described by \( y = 0.35 \sin (2\pi t - 10\pi x) \), where \( x \) and \( y \) are in metre and \( t \) in second, is a wave travelling along the:

A vector \( \mathbf{P} \) has components along X and Y axis having magnitude 2 units and 4 units respectively. A vector along negative X-axis, \( \mathbf{Q} \) has magnitude 6 units. Then vector \( (\mathbf{P} - \mathbf{Q}) \) is:

A large number of liquid drops each of radius \( r \) coalesce to form a big drop of radius \( R \). The energy released in the process is converted into kinetic energy of the big drop. The speed of the big drop is: (T = surface tension of liquid, \( \rho = \) density of liquid)

In a semiconductor diode, the barrier potential offers opposition to only:

A block of mass \( m \) collides with another stationary block of mass \( 2m \). The lighter block comes to rest after collision. If the velocity of the first block is \( u \), then the value of the coefficient of restitution is:

A thin lens of glass of refractive index 1.5 has focal length 24 cm in air. It is now immersed in a liquid of refractive index \( \frac{9}{8} \). Its new focal length is:

A particle starting from mean position oscillates simple harmonically with period 4 s. After what time will its kinetic energy be 75% of the total energy? (cos \( 30^\circ = \frac{\sqrt{3}}{2} \))

If number of turns in moving coil galvanometer becomes half, then the deflection for the same current will become:

In the figure shown, the voltage across \( C_3 \) will be:

A circular disc \( X \) of radius \( R \) made from iron plate of thickness \( t \) has moment of inertia \( I_x \) about an axis passing through the centre of the disc and perpendicular to its plane. Another disc \( Y \) of radius \( 3R \) made from an iron plate of thickness \( \frac{t}{3} \) has moment of inertia \( I_y \) about the axis same as that of disc X. The relation between \( I_x \) and \( I_y \) is:

To what depth must a rubber ball be taken in deep sea so that its volume is decreased by 0.2%? The bulk modulus of rubber is \( 9.8 \times 10^8 \, \text{N/m}^2 \) and the density of sea water is \( 10^3 \, \text{kg/m}^3 \) (g = 9.8 m/s\(^2\))

Two wires carrying currents \( I \) and \( 2I \) (in opposite directions) are parallel to each other. Third wire carrying current \( I \) is placed midway between the two wires and anti-parallel to a wire carrying current \( I \). Force due to magnetic field on third wire will be:

Length of an organ pipe open at both ends is 34 cm. If velocity of sound is 340 m/s, then the frequency of 2nd overtone is:

A wooden block is placed on a rough horizontal surface. It is given a velocity \( u \) m/s and the coefficient of friction between the block and the surface is \( \mu \). The distance covered by the block before coming to rest is: (g = acceleration due to gravity)

Two identical wires of same length are vibrating in unison with a tuning fork, under same tension. The length of one wire is decreased by 1 cm and it produces 3 beats per second with the tuning fork. The length of the other wire is increased by 1 cm and it produces 2 beats per second with the tuning fork. If the original length of wire is 67 cm, the frequency of the tuning fork is:

The r.m.s. velocity of hydrogen molecules at temperature \( T \) is seven times the r.m.s. velocity of nitrogen molecules at 300 K. This temperature \( T \) is (Molecular weights of hydrogen and nitrogen are 2 and 28 respectively):

The surface density of charge on the surface of a charged conductor in air is \( 0.885 \, \mu C/m^2 \). The outward force per unit area of charged conductor is:

An electron moving with initial velocity \( \mathbf{V} = V_0 \hat{i} \) is moving in a magnetic field \( \mathbf{B} = B \hat{k} \). Then its de-Broglie wavelength: