List of top Physics Questions asked in MHT CET

A uniform rod AB of mass \( m \) and length \( l \) is at rest on a smooth horizontal surface. An impulse \( P \) is applied to the end B. The time taken by the rod to turn through a right angle is

A pipe closed at one end has length 0.8 m. At its open end, a 0.5 m long uniform string is vibrating in its second harmonic and it resonates with the fundamental frequency of the pipe. If the tension in the wire is 50 N and the speed of sound is 320 m/s, the mass of the string is

The magnitude of total energy and angular momentum of an electron in the \( n \)th orbit of a Bohr atom is denoted by \( E_n \) and \( L_n \), respectively. Then

A cylindrical magnetic rod has length 5 cm and diameter 1 cm. It has uniform magnetization \( 5 \times 10^3 \, \text{A/m} \). Its net magnetic dipole moment is nearly

A ray of light passes through an equilateral prism such that the angle of incidence is equal to angle of emergence and each of these angles is equal to \( \frac{1}{3} \)rd the angle of prism. The angle of deviation is

A uniform metal wire of length \( L \), mass \( M \) and density \( \rho \) is under a tension \( T \). If the speed of transverse wave along the wire is \( V \), then area of cross-section of the wire is

Two identical parallel plate air capacitors are connected in series to a battery of e.m.f. \( V \). If one of the capacitors is inserted in liquid of dielectric constant \( K \), then potential difference of the other capacitor will become

In communication system, the range for line of sight propagation in case of earth is \( d \), for the height of antenna \( h \). If \( h \) is doubled then the new range is

From a disc of mass \( M \) and radius \( R \), a circular hole of diameter \( R \) is cut whose rim passes through the centre. The moment of inertia of the remaining part of the disc about perpendicular axis passing through the centre is

A glass convex lens is of refractive index 1.55 with both faces of same radius of curvature. What will be the radius of curvature if focal length is to be 20 cm?

The 3rd overtone of a closed organ pipe is in unison with 3rd overtone of an open pipe. The ratio of the length of the closed pipe to the length of open pipe is

An alternating e.m.f. is given by \( e = e_0 \sin \omega t \). In what time the e.m.f. will have half its maximum value, if \( e_0 \) starts from zero? (T = Time period)

The polarising angle for a transparent medium is \( \theta \) and \( v \) is the speed of light in that medium, then relation between \( \theta \) and \( v \) is (c = velocity of light)

What should be the velocity of earth due to rotation about its own axis so that the weight at equator becomes \( \frac{1}{25} \) of initial value?
(Radius of Earth on equator = 6400 km, \( g = 10 \, \text{m/s}^2 \), \( \cos 0^\circ = 1 \))

In energy band diagram of insulators, a band gap and the conduction band is respectively

Due to surface tension, the excess pressure inside a smaller drop is 9 units. If 27 smaller drops combine, then the excess pressure inside the bigger drop is

A circular and a square coil is prepared from two identical metal wires and a current is passed through them. Ratio of magnetic dipole moment associated with circular coil to that with square coil is

The unknown resistances are connected in two gaps of a metre bridge. The null point is at 20 cm from zero end. A resistance of 15 \( \Omega \) is connected in series with the smaller of the two. The null point shifts to 40 cm. The smaller resistance is

Light of incident frequency 2 times the threshold frequency is incident on a photosensitive material. If the incident frequency is made \( \frac{1}{3} \)rd and intensity is doubled then the photoelectric current will

If a gas is compressed isothermally then the r.m.s. velocity of the molecules

When a photosensitive surface is irradiated by lights of wavelengths \( \lambda_1 \) and \( \lambda_2 \), kinetic energies of emitted photoelectrons are \( E_1 \) and \( E_2 \) respectively. The work function of the photosensitive surface is

Two galvanometers 'G1' and 'G2' require 2 mA and 3 mA respectively to produce the same deflection. Then

A body of mass 5 kg is moving in a straight line. The relation between its displacement and time is \( x = (t^3 - 2t - 10) \) m. What is the force acting on it at the end of 5 seconds?

In communication system, for a given block diagram of receiver, the boxes 'X' and 'Y' respectively represent

A torque of 50 Nm acts on a body for 8 seconds which is initially at rest. The change in its angular momentum is