List of top Physics Questions

A particle of mass $0.2\, kg$ tied at the end of a spring is being rotated along a vertical circle of radius $0.5\, m$ at critical speed of $5 \,m/s$. The tension T in the string at the highest point of its path is

Which of the following pairs does not have same dimensions ?

What is moment of inertia of a cylinder of radius $r$, along its height ?

Two spherical soap bubbles of radii $a$ and $b$ in vacuum coaleasce under isothermal conditions. The resulting bubbles has a radius given by

Two identical charged spheres are suspended by strings of equal lengths. The strings make an angle of $30^{\circ}$ with each other. When suspended in a liquid of density $0.8\, g\, cm^{-3}$, the angle remains the same. If density of the material of the sphere is $16\, g\, cm^{-3}$, the dielectric constant of the liquid is

Two fixed frictionless inclined plane making an angle $30^{\circ}$ and $60^{\circ}$ with the vertical are shown in the figure. Two block $A$ and $B$ are placed on the two planes. What is the relative vertical acceleration of $A$ with respect to $B$ ?

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