HSC Science (Computer Science) १२ वीं कक्षा - Maharashtra State Board Important Questions for Physics

A stone is tied to one end of a string. Holding the other end, the string is whirled in a horizontal plane with progressively increasing speed. It breaks at some speed because ______ 

During ice ballet, while in the outer rounds, why do the dancers outstretch their arms and legs.

Two bodies have their moments of inertia I and 2I respectively about their axis of rotation. If their kinetic energies of rotation are equal, then what is the ratio of their angular velocity.

A bucket containing water is tied to one end of a rope 5 m long and it is rotated in a vertical circle about the other end. Find the number of rotations per minute in order that the water in the bucket may not spill.

A flywheel of mass 8 kg and radius 10 cm rotating with a uniform angular speed of 5 rad/sec about its axis of rotation, is subjected to an accelerating torque of 0.01 Nm for 10 seconds. Calculate the change in its angular momentum and change in its kinetic energy. 

What is a conical pendulum? Obtain an expression for its time period

Obtain an expression for maximum safety speed with which a vehicle can be safely driven along a curved banked road. 

When the bob performs a vertical circular motion and the string rotates in a vertical plane, the difference in the tension in the string at horizontal position and uppermost position is ______.

Calculate the moment of inertia of a uniform disc of mass 10 kg and radius 60 cm about an axis perpendicular to its length and passing through its center.

An electron in an atom is revolving round the nucleus in a circular orbit of radius 5.3 × 10^-11 m with a speed of 3 × 10⁶ m/s. Find the angular momentum of electron.

If friction is made zero for a road, can a vehicle move safely on this road?

Derive expressions for the linear velocity at the lowest position, mid-way position and top-most position for a particle revolving in a vertical circle, if it has to just complete circular motion without string slackening at the top.

A ceiling fan has a moment of inertia of 2 kg. m². It attains maximum frequency of 60 r.p.m. in 2π seconds. Calculate its power rating.

State and prove the theorem of the parallel axis about the moment of inertia.

Calculate the change in angular momentum of the electron when it jumps from third orbit to first orbit in hydrogen atom.
(Take h = 6.33 × 10⁻³⁴ Js)

The moment of inertia (MI) of a disc of radius R and mass M about its central axis is ______.

Define centripetal force.

Derive an expression for maximum speed moving along a horizontal circular track.

A horizontal force of 0.5 N is required to move a metal plate of area 10⁻² m² with a velocity of 3 × 10⁻²m/s, when it rests on 0.5 × 10⁻³ m thick layer of glycerin. Find the coefficient of viscosity of glycerin.

The radius of a circular track is 200 m. Find the angle of banking of the track, if the maximum speed at which a car can be driven safely along it is 25 m/sec.