List of top Physics Questions asked in MHT CET

When a beam of unpolarised monochromatic light is incident on a plane glass plate at a polarising angle, which one of the following statements is correct?

According to Bohr’s postulate, the centripetal force \(F\) necessary for the electron of mass \(m\) in a hydrogen atom to revolve in the \(n^{\text{th}}\) circular orbit round the nucleus as the centre is given by \([e =\) charge on electron, \(h =\) Planck’s constant, \(\varepsilon_0 =\) permittivity of free space\(]\)

A note produces 4 beats/s with a tuning fork of frequency \(510\,\text{Hz}\) and 6 beats/s with a fork of frequency \(512\,\text{Hz}\). The frequency of the note is

For an ideal gas, if the ratio of molar specific heats \(\gamma = 1.4\), then the specific heat at constant pressure \(C_p\), specific heat at constant volume \(C_v\) and corresponding molecule are respectively

A smooth sphere of mass \(M\) moving with velocity \(u\) directly collides elastically with another sphere of mass \(m\) at rest. After collision, their final velocities are \(V'\) and \(V\) respectively. The value of \(V\) is given by

What is the stopping potential, when a metal surface with work function \(1.2\,\text{eV}\) is illuminated with light of energy \(3\,\text{eV}\)?

A body performs S.H.M. due to force \(F_1\) with time period \(0.8\,\text{s}\). If the force is changed to \(F_2\), it executes S.H.M. with time period \(0.6\,\text{s}\). Now both the forces act simultaneously in the same direction on the same body. The new periodic time is

An ideal gas occupies a volume \(V\) at pressure \(P\) and absolute temperature \(T\). The mass of each molecule is \(m\). If \(K_B\) is the Boltzmann constant, then the density of the gas is given by

The depth of an ocean is \(2000\,\text{m}\). The compressibility of water is \(45 \times 10^{-11}\,\text{m}^2/\text{N}\) and density of water is \(10^3\,\text{kg m}^{-3}\). At the bottom of the ocean, the fractional compression of water will be \((g = 10\,\text{m s}^{-2})\)

A uniform wire has length \(L\) and weight \(W\). One end of the wire is attached rigidly to the roof and weight \(W_1\) is suspended from its lower end. If \(A\) is the cross-sectional area of the wire, then the stress in the wire at a height \(\dfrac{3L}{4}\) from its lower end is

Pascal’s law is not applied in

In communication with the help of antenna, the range covered (for the line of sight propagation) is initially \(d\). If the height of antenna is doubled, the range covered would become

A small mass \(m\) is suspended at the end of a wire of negligible mass, length \(L\) and cross-sectional area \(A\). The frequency of oscillation for S.H.M. along the vertical line is \([Y =\) Young’s modulus of the material of the wire\(]\)

A body of mass \(m\) is moving along a circle of radius \(r\) with linear speed \(v\). Now, to change the linear speed to \(\dfrac{v}{2}\) and to move it along the circle of radius \(4r\), required change in the centripetal force of the body is

In suspended type of moving coil galvanometer

In a balanced metre bridge, \(5\,\Omega\) is connected in the left gap and \(R\,\Omega\) in the right gap. When \(R\,\Omega\) is shunted with an equal resistance, the new balance point is at \(1.6\,\ell_1\), where \(\ell_1\) is the earlier balancing length. The value of \(\ell_1\) is

A positively charged particle \((q)\) travelling at \(30^\circ\) with respect to the direction of a magnetic field of strength \(2.4 \times 10^{-6}\,\text{T}\) experiences a force of \(4.8 \times 10^{-19}\,\text{N}\). The speed of the charged particle will be \([q = 1.6 \times 10^{-19}\,\text{C},\ \sin 30^\circ = \tfrac{1}{2}]\)

A current of \(3\,\text{A}\) flows through the following circuit in anticlockwise direction as well as in clockwise direction. The value of \(E\) respectively is

Electric field intensity at a point outside uniformly charged thin infinite plane sheet is \(E_1\). The electric field intensity at a point near and outside the surface of a positively charged conductor of any shape is \(E_2\). The relation between magnitude of \(E_1\) and \(E_2\) is (assume air as the medium)

The relation between force \(F\) and density \(d\) is \(F \propto \dfrac{x}{\sqrt{d}}\). The dimensions of \(x\) are

A mass \(m\) suspended from a spring stretches it by \(5\,\text{cm}\) when on the surface of the earth. The mass is then taken to a height of \(1600\,\text{km}\) above earth’s surface and again suspended from the same spring. At this altitude the extension of the spring is (Radius of earth \(= 6400\,\text{km}\))

For a photocell, the work function is \(\phi\) and the stopping potential is \(V_s\). The wavelength of the incident radiation is

In a resonance tube, the first and second resonance are heard when water level is \(24.1\,\text{cm}\) and \(74.1\,\text{cm}\) respectively below the open end of the tube. The inner diameter of the tube is

A ring and a disc roll on a horizontal surface without slipping with same linear velocity. If both have same mass and total kinetic energy of the ring is \(4\,\text{J}\), then total kinetic energy of the disc is

The electron in the hydrogen atom is moving with a speed of \(2 \times 10^{6}\,\text{m s}^{-1}\) in an orbit of radius \(0.5\,\text{\AA}\). The magnetic moment of the revolving electron is