List of top Physics Questions asked in MHT CET

What should be the length of a closed pipe to produce resonance with sound wave of wavelength 62 cm, in fundamental mode? (Neglect end correction)
The refraction of light ray takes place from air to water, water to glass and again glass to air. The ray emerges parallel to incident ray. The correct relation is [\(n_a, n_w, n_g\) represent refractive indices of air, water and glass respectively]
Soap solution is used for cleaning dirty clothes because
A constant torque of 200 N m turns a flywheel, which is at rest, about an axis through its centre and perpendicular to its plane. If its moment of inertia is \(50 \, \text{kg m}^2\), then in 4 second, what will be change in its angular momentum?
A force \(F\) of same magnitude is applied tangentially on upper and lower face of a cube, in opposite directions. Side of the cube is \(L\). The upper face of the cube shifts parallel to itself by a distance \(x_1\). If another cube of same material but side \(2L\) is subjected to the above condition, then the displacement of the top layer is
The fundamental frequency of a sonometer wire is 50 Hz for some length and tension. If the length is increased by 25% by keeping tension same, then frequency change of second harmonic is
A concave mirror of focal length \(f_1\) is placed at a distance \(d\) from a convex lens of focal length \(f_2\). A parallel beam of light coming from infinity parallel to principal axis falls on the convex lens and then after refraction falls on the concave mirror. If it is to retrace the path, the distance \(d\) should be
If the radius of the spherical Gaussian surface is increased then the electric flux due to a point charge enclosed by the surface
A charged particle is always moving parallel to the direction of magnetic field. The magnetic force acting on the particle will be
A closed pipe containing liquid showed a pressure \(P_1\) by gauge. When the valve is opened, pressure was reduced to \(P_2\). The speed of water flowing out of the pipe is ( \(\rho\) = density of water )
When a mass \(m\) is suspended from a spring of length \(\ell\), the length of the spring becomes \(L\). The mass is pulled down by a distance \(d\) and released. If the equation of motion of the mass is \( \frac{d^2x}{dt^2} + Px = 0 \), then \(P\) is equal to ( \(g\) = acceleration due to gravity )
Young's double slit experiment is performed in water instead of air, then fringe width
A particle executes uniform circular motion with angular momentum \(L\). Its rotational kinetic energy becomes half when the angular frequency is doubled. Its new angular momentum is
An alternating current of frequency 50 Hz has the peak value as 14.14 A. The time taken by the alternating current in reaching from zero to maximum value and r.m.s. value of current will be respectively
I–V characteristics for a junction diode is shown. The device is
A shell of mass \(M\) initially at rest suddenly explodes into three fragments. Two of these fragments are of mass \(M/4\) each, which move with velocities \(3 \, \text{m s}^{-1}\) and \(4 \, \text{m s}^{-1}\) respectively in mutually perpendicular directions. The magnitude of velocity of the third fragment is
The coefficient of mutual induction is 2 H and induced e.m.f. across secondary is 2 kV. Current in the primary is reduced from 6 A to 3 A. The time required for the change of current is
In the block diagram of generalized communication system, the element labelled as 'X' is
At any instant, the magnitude of the centripetal force on a particle of mass \( m \) performing circular motion is given by
A sample of radioactive element contains \( 8 \times 10^{16} \) active nuclei. The half-life of the element is 15 days. The number of nuclei decayed after 60 days is
Two waves given as \( y_1 = 10 \sin t \, \text{cm} \) and \( y_2 = 10 \sin \left( \omega t + \frac{\pi}{3} \right) \, \text{cm} \) are superimposed. What is the amplitude of the resultant wave?
A cube of mass \( M \) and side \( L \) is fixed on the horizontal surface. Modulus of rigidity of the material of the cube is \( \eta \). A force is applied perpendicular to one of the side faces. When the force is removed, the cube executes small oscillations. The time period is
A body attached to a spring oscillates in horizontal plane with frequency \( n \). Its total energy is \( E \). If the velocity in the mean position is \( v \), then the spring constant is
A charged particle carrying a charge \( q \) and moving with velocity \( v \), enters into a solenoid carrying a current \( I \), along its axis. If \( B \) is the magnetic induction along the axis of solenoid, then the force \( F \) acting on the charged particle will be
In the given electrical network, the correct equation for the loop 'ABEFA' is