List of top Physics Questions

Block of mass $3\,\text{kg}$ is connected to a flywheel of mass $3\,\text{kg}$ and radius $5\,\text{m}$ through a massless string wrapped around the flywheel. Find kinetic energy (in J) of flywheel when block descends by $3\,\text{m}$.

Find time taken by the block to reach the bottom.

Mass number of a nucleus is $\alpha$ and its radius is $R_\alpha$. Radius of another nucleus of mass number $\beta$ is $R_\beta$. If $\beta = 8\alpha$, then find $\dfrac{R_\alpha}{R_\beta}$.

For a particle moving in x-direction according to the relation $x = 4t^3 - 3t$, consider the following statements:

[(a)] At $t = 0.866$, $x = 0$
[(b)] Direction of velocity of particle remains same
[(c)] Direction of velocity of particle changes at $x = -1$
[(d)] Direction of velocity of particle changes at $x = 0.5\,\text{m}$
[(e)] Acceleration is non-negative
Correct statements are:

If percentage increase in Young's modulus $Y$ is $1%$, percentage increase in density of material is $0.5%$ and longitudinal wave traveling in a metallic bar has wave velocity of $400\,\text{m/s}$, then find final velocity of the wave.

A current is flowing along the surface of a long solid cylinder of radius $R$. Select the correct statement(s):

[(A)] Magnetic field ($B$) is minimum along the axis of cylinder
[(B)] Magnetic field ($B$) is minimum at the surface of cylinder
[(C)] Magnetic field ($B$) is maximum at the surface of cylinder
[(D)] Magnetic field ($B$) is maximum along the axis of cylinder
[(E)] Magnetic field ($B$) is same all over the cross section of cylinder

In the given circuit, energy stored in the inductor is $16\,\text{J}$ and power dissipated in resistance is $32\,\text{W}$. Find the value of $\dfrac{X_L}{R}$.

A light ray incident on a slab of refractive index $ \frac{3}{2} $. If the wavelength of the refracted ray is 520 nm, find the wavelength of the incident ray.

Ice is heated from $-20^\circ C$ to $200^\circ C$. Which of the following temperature (T) vs heat (Q) graph is correct ?

If nothing is kept between jaws, zero of Vernier scale lies right of 0 cm of main scale and $4^{th}$ line of Vernier scale matches perfectly with any line of main scale. An object is kept between jaws and zero of Vernier scale crosses $15^{th}$ division of main scale and $5^{th}$ division of Vernier scale exactly matches with any line of main scale. (Least count = 0.1 mm and 1 MSD = 1mm). Find dimension of object :

A particle is falling under gravity. Air resistance on particle is F = $-$kv. Find correct option :

Two wires of cross sectional area $1 \text{ cm}^2$ and $2 \text{ cm}^2$ and lengths 20 cm and 30 cm are connected to the same load. If their extensions are same, find the ratio of their Young's modulus :

10kg ice at $-10^\circ C$ & 100kg water at $25^\circ C$ are mixed together. Find final temperature. (Given $S_{ice} = \frac{1}{2}$ cal/g$^\circ C$, $L_{fusion} = 80$cal/g and $S_{water} = 1$cal/g$^\circ C$)

An atom ${}_3^8 X$ is bombarded with electrons, neutrons and protons and in 10 sec, 10 electrons, 10 protons and 9 neutrons are absorbed. If final surface area is x% of initial area, find x : -

In the system of two discs and a rod of mass 600 g each, a torque of magnitude $43 \times 10^5$ dyne-cm is applied along the axis of rotation as shown in figure. Find the approx angular acceleration about given axis :

Find external force F so that block can move on inclined plane with constant velocity.

As shown in the figure, radius of gyration about the axis shown in $\sqrt{n}$ cm for a solid sphere. Find 'n'.

Find the ratio of de-Broglie wavelengths of deuteron having energy E and $\alpha$-particle having energy 2E :

In YDSE, slit separation $d = 2$ mm, distance between slits and screen $D = 10$ m. Wavelength of light is $\lambda = 6000$\AA. If intensity of light through each slit is $I_0$, find intensity at point directly in front of one of the slits.

In case of meter bridge experiment balance length for $2\Omega$ and $3\Omega$ is $\ell$ and for $x\Omega$ and $3\Omega$ is $(\ell + 10)$ cm. Find $x$.

A cylindrical object of density $600\,\text{kg/m}^3$ and height $8$ cm is floating in a liquid of density $900\,\text{kg/m}^3$. Find height of cylinder inside liquid.

A soap bubble of diameter $7$ cm, its diameter is increased to $14$ cm. If change in its surface energy is $(15000 - x)\,\mu$J, find $x$. (Given surface tension = $0.04$ N/m)

A flexible chain of mass $m$ is hanging as shown. Find tension at the lowest point.

When rod becomes horizontal find its angular velocity. It is pivoted at point A as shown.

An electron makes transition from higher energy orbit to lower energy orbit in $Li^{2+}$ ion such that $n_1 + n_2 = 4$ and $n_2 - n_1 = 2$. Determine the wavelength of emitted photon in transition (in cm).