List of top Physics Questions

From a solid sphere of mass $M$ and radius $R$, a cube of maximum possible volume is cut. Moment of inertia of cube about an axis passing through its centre and perpendicular to one of its faces is

For an amplitude modulated wave the maximum amplitude is found to be $ 10\,V $ while the minimum amplitude is found to be $ 2V $ , the modulation index is

Consider a ray of light travelling from a denser to a rarer medium. If it is incident at the critical angle then

Consider a bi-convex lens and a plano-convex lens, with radii of curvature of all the curved surfaces being same. If $f$ is the focal length of bi-convex lens then, the focal length of the plano-convex lens is

At a certain time a particle has a speed of $18\, m/s$ in positive x-direction and $2.4\, s$ later its speed was $30\, m/s$ in the opposite direction. What is the magnitude of the average acceleration of the particle during the $2.4\, s$ interval?

Astronomical unit $(Au)$ is the average distance between the earth and sun approximately $1.5 \times 10^{8} km$. The speed of light is about $3.0 \times 10^{8} m / s$. The speed of light in astronomical unit per minute is

A triangular loop of side $ 1 $ carries a current $ i $ . It is placed in a magnetic field $ B $ , such that the plane of the loop is in the direction of $ B $ . The torque on the loop is

A solid sphere falls with a terminal velocity of $20\, m/s$ in air. If it is allowed to fall in vacuum?

A shell fired from a gun at sea level rises to a maximum height of $ 5\, km $ when fired at a ship $ 20 \,km $ away. The muzzle velocity should be

A conductor (shown in the figure) carrying constant current $I$ is kept in the $x-y$ plane in a uniform magnetic field $\vec{B}$. If $F$ is the magnitude of the total magnetic force acting on the conductor, then the correct statement(s) is(are)

A rectangular loop of sides $10\, cm$ and $5\, cm$ carrying a current $I$ of $12 \,A$ is placed in different orientations as shown in the figures below,

If there is a uniform magnetic field of $0.3\, T$ in the positive $z$-direction in which orientations the loop would be in (i) stable equilibrium and (ii) unstable equilibrium?

A quarter horse power motor runs at a speed of $ 600\, rpm $ . Assuming $ 40\% $ efficiency, the work done by the motor in the one rotation will be

A long wire carrying a steady current is bent into a circular loop of one turn. The magnetic field at the centre of the loop is $B$. It is then bent into a circular coil of $n$ turns. The magnetic field at the centre of this coil of $n$ turns will be

A circular loop of area $1\,cm^{2} $ , carrying a current of $10\,A$ is placed in a magnetic field of $0.1\,T$ perpendicular to the plane of the loop. The torque on the loop due to the magnetic field is

According to Newton's law of cooling, the rate of cooling of a body is proportional to $(\Delta \theta)^n$, where $\Delta \theta$ is the difference of the temperature of the body and the surroundings, and $n$ is equal to

If $ S $ is the stress and $ Y $ is the Young?s modulus of material of a wire, the energy stored in the wire per unit volume is

From a building two balls $A$ and $B$ are thrown such that $A$ is thrown upwards and $B$ downwards with the same speed (both vertically). If $v_A$ and $v_B$ are their respective velocities on reaching the ground then,

In a transformer the number of primary turns is four times that of the secondary turns. Its primary is connected to an $AC$ source of voltage $V$. Then,

Which of the following is NOT an electromagnetic wave?

A parallel narrow-beam of light is falling normally on a glass sphere. It will come to a focus

A block of mass $M$ is pulled along a horizontal frictionless surface by a rope of mass $m$. If a force $P$ is applied at the free end of the rope, the force exerted by the rope on the block is

Two ideal diodes are connected to a battery as shown in the circuit. The current supplied by the battery is

The plane face of a planoconvex lens is silvered. If $\mu$ be the refractive index and $R$, the radius of curvature of curved surface, then the system will behave like a concave mirror of radius of curvature

The dimensions of heat capacity are

The diameter of a flywheel is increased by 1%. Increase in its moment of inertia about the central axis is