List of top Physics Questions

Two charges are at a distance $d$ apart. If a copper plate of thickness $ \frac{d}{2} $ is kept between them, the effective force will be
Transpiration Cohesion tension theory operates in ............
The potential energy function for the force between two atoms in a diatomic molecule is approximately given by $U\left(x\right) = \frac{a}{x^{12}} - \frac{b}{x^{6}}$, where a and b are constants and x is the distance between the atoms. If the dissociation energy of the molecule is $d = \left[U\left(x = \infty\right) - U_{at \,equilibrium}\right], D$ is
The optical path of a monochromatic light is same if it goes through $4.0 \,cm$ of glass or $4.5 \,cm$ of water. If the refractive index of glass is $1.53$, the refractive index of the water is
The mass and diameter of a planet are twice those of earth. The period of oscillation of pendulum on this planet will be (if it is a seconds pendulum on earth)
The latent heat of vaporisation of a substance is always
The ionisation potential of mercury is $10.39\, V$. How far ah electron must travel in an electric field of $ 1.5\times {{10}^{6}}V/m $ to gain sufficient energy to ionise mercury?
The following arrangement consists of five identical metal plates marked $1$, $2$, $3$, $4$ and $5$ parallel to each other. Area of each plates is $A$ and separation between the successive plates is $d$. The capacitance between $P$ and $Q$ is
The equation of a particle executing SHM is $\frac{2d^2x}{dt^2}+32x=0$Then the time period of the body is
The core of any transformer is laminated so as to
The capacitance of a metallic sphere is $ 1\,\mu F, $ then its radius is nearly
Rocket propulsion is associated with
One can easily weighs the earth by calculating the mass of earth using the formula (in usual notation)
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.