MAH-MHT CET (PCM/PCB) entrance exam Question Bank Solutions for Physics

Two toroids 1 and 2 have total number of turns 400 and 200 respectively with average radii 40 cm and 20 cm respectively. If they carry same current I, the ratio of the magnetic fields along the two loops is, ____________.

Moment of inertia of earth about its axis of rotation is ____________.

If a million tiny droplets of water of the same radius coalesce into one larger drop, then the ratio of the surface energy of the large drop to the total surface energy of all the droplets will be ____________.

A 600 turn coil of effective area 0.05 m² is kept perpendicular to a magnetic field 4 x 10^-5 T. When the plane of the coil is rotated by 90° around any of its coplanar axis in 0.1 s, the e.m.f. induced in the coil will be: ____________.

In inelastic collision, ____________.

On the surface of the liquid in equilibrium, molecules of the liquid possess ____________.

A mass M moving with velocity 'v' along x-axis collides and sticks to another mass 2M which is moving along Y-axis with velocity 3v. After collision, the velocity of the combination is ______.

Consider a process shown in the figure. During this process, the work done by the system ______.

From a disc of mass 'M' and radius 'R', a circular hole of diameter 'R' is cut whose rim passes through the center. The moment of inertia of the remaining part of the ruse about perpendicular axis passing through the center is ______.

Absorption coefficient of totally blackbody is ______.

A cord is wound round the circumference of a wheel of radius 'r'. The axis of the wheel is horizontal and moment of inertia about it is T. A block of mass 'm' is attached to free end of the cord, initially at rest. When the wheel rotates and the block moves vertically downwards through distance 'h', the angular velocity of the wheel will be ______.
(Neglect the mass of cord, g =acceleration due to gravity)

The magnetic induction along the axis of a toroidal solenoid is independent of ______.

A solenoid of 1.5 m length and 4 cm diameter possesses 20 turns per m. A current of 6 A is flowing through it. The magnetic induction at axis inside the solenoid is ____________.

The moment of inertia of a body initially at rest about a given axis is 1.2 kg m². On applying an acceleration of 25 rad/s², the time it will take to acquire a rotational kinetic energy of 1500 J is ____________.

A proton is projected with a uniform velocity 'v' along the axis of a current carrying solenoid, then ____________.

Out of 20 J of radiant energy incident on a surface, the energy absorbed by the surface is 4 J and the energy reflected is 8 J. Then, coefficient of transmission of the body is ____________.

The space within a current carrying toroid is filled with a m metal of susceptibility 16.5 x 10^-6. The percentage increase in the magnetic field B is ____________.

A rod of length 1 m and mass `1/2` kg rotates at an 2 angular speed of 6 rad s^-1 about one of its ends. The kinetic energy of the rod is ______.

Magnetic induction due to a toroid does not depend upon ______.

Three rings, each of mass P and radius Q, are arranged as shown in the figure. The moment of inertia of the arrangement about YY' will be ______.