List of top Physics Questions

Moment of inertia of a ring of mass $M$ and radius $R$ about a tangent to the circle of the ring is
If the energy, $E = G^p \,h^q \,c^r$, where $G$ is the universal gravitational constant, $h$ is the Planck?? constant and $c$ is the velocity of light, then the values of $p$, $q$ and $r$ are, respectively
Gravitational acceleration on the surface of a planet is $\frac{ \sqrt{6}}{11}$ where g is the gravitational acceleration on the surface of the earth. The average mass density of the planet is 1/3 times that of the earth. If the escape speed on the surface of the earth is taken to be 11 kms$^{-1}$, the escape speed on the surface of the planet in kms$^{1}$ will be.
Four holes of radius $R$ are cut from a thin square plate of side $4R$ and mass $M$. The moment of inertia of the remaining portion about z-axis is
For a particle in uniform circular motion the acceleration $\vec{a}$ at a point $P\left(R,\,\theta\right)$ on the circle of radius $R$ is (here $\theta$ is measured from the x-axis)
Binding energy of nucleus is defined as
Two balls of different masses are thrown vertically upward with same speed. They will pass through their point of projection in the downward direction with the same speed. The maximum height and downward velocity attained at the point of projection are independent of the mass of the ball.
X-ray astronomy is possible only from satellites orbiting the earth. Efficiency of X-rays telescope is large as compared to any other telescope.
The apparent weight of a body in an elevator moving with some downward acceleration is less than the actual weight of a body. The part of the weight is spent in producing downward acceleration, when body is in elevator.
In javelin throw, the athlete throws the projectile at an angle slightly more than 45$^{\circ}$. The maximum range does not depend upon angle of projection.
The fundamental frequency of an open organ pipe increases as the temperature is increased. As the temperature increases, the velocity of sound increases more rapidly than length of the pipe.
The change in kinetic energy of a particle is equal to the work done on it by the net force. Change in kinetic energy of particle is equal to the work done only in case of a system of one particle.
The value of DC voltage in half wave rectifier in converting AC voltage V = 100 gm (314 t) into DC is
What controls the conduction of p-n function?
If half-Iife of radio isotope is 2 s and number of atoms is 25. The activity of a radioactive sample is measured as only 4, then after one half-life, the remaining atoms are
Mean free path of gas molecule at constant temperature is inversely proportional to
Electric field and current density have relation
Simple behaviour under all conditions of real gas is governed by the equation
Angular resolving power of human eye is
An open water tight railway wagon of mass $ 5\times 10^{3}kg $ coasts at an initial velocity of $1.2\,ms^{-1}$ without friction on a railway track. Rain falls vertically downwards into the wagon. What change occurs in KE of the wagon, when it has collected $10^3\, kg$ of water?
A transformer of 100% efficiency has 200rums in the primary and 40000 turns in secondary. It is connected to a 220 V main supply and secondary feeds to a 100 $ K\Omega $ resistance. The potential difference per turn is
In a single slit diffraction pattern, the distance between the first minimum on the left and the first minimum on the right is 5 mm. The screen on which the diffraction pattern is displayed is at a distance of 80 cm from the slit. The wavelength is $ 6000{AA} $ The slit width (in mm) is about
Two coherent monochromatic light beams of intensities $ I $ and 9 $ I $ are superimposed. The maximum and the minimum intensities of the resultant beams are
When a ray is incident on a medium of refractive index n at Brewster's angle, it gets
A solenoid of length 50 cm and a radius of cross-section 1 cm has 1000 turns of wire wound over it. If the current carried is 5 A, the magnetic field on its axis, near the centre of the solenoid is approximately (permeability of free space $ {{\mu }_{0}}~=4\pi \times {{10}^{-7}}T-m/A $ )