List of top Physics Questions

Radius of $n^{th}$ orbit of $H$-like particles is proportional to
Heat absorbed by a mass of 1 g of helium, when its temperature rises from $ 11{}^\circ C $ to $ 131{}^\circ C $ at constant volume, is H. Heat absorbed by 7 g of nitrogen, when its temperature rises from $ 11{}^\circ C $ to $ 71{}^\circ C $ at constant volume, is $ {{H}_{N}} $ . The ratio of H to $ {{H}_{N}} $ is
Forces 5 N, 12 N and 13 N are in equilibrium. If $ sin\text{ }23{}^\circ =\frac{5}{13}, $ the angle between 5 N force and 13 N force is
A body moving with uniform acceleration describes 12 m in the third second of its motion and 20 m in the 5th second. Find the velocity after 10 th second.
A man slides down a light rope whose breaking strength is $ \eta $ times his weight. What should be his maximum acceleration so that the rope just not breaks?
By what percent the energy of a satellite has to be increased to shift it from an orbit of radius r to 3r?
The motor of an engine is rotating about its axis with an angular velocity of 100 rev/m. If conies to rest in 15s, after being switched off. Assuming constant angular deceleration. What are the numbers of revolutions made by it before coming to rest?
The dimension of $ \frac{P}{a} $ in the equation $ p=\frac{b-{{t}^{2}}}{ax} $ where p is pressure, $ x $ is distance and t is time are
When monochromatic red light is used instead of blue light in a convex lens, its focal length will :
What is the moment of inertia for a solid sphere w.r.t. a tangent touching to its surface?
What is the dimensions of magnetic field B in terms of C (= coulomb), M, L, T?
Water is flowing with velocity $4 \,m\,s^{-1}$ in a cylinder of diameter $8\,cm$, it is connected to a pipe with it end tip of diameter $2\,cm$, calculate the velocity of water at this free end.
Two particles of equal mass $'m'$ go around a circle of radius $R$ under the action of their mutual gravitational attraction. The speed of each partial with respect to their centre of mass is :
Two bodies of masses 4 kg and 5 kg are moving with equal momentum. Then the ratio of their respective kinetic energies is
Two batteries of emfs $2\, V$ and $1 \,V$ of internal resistances $1 \Omega$ and $ 2 \, \Omega$ respectively are connected in parallel. The effective emf of the combination is
The velocities of a particle in $ SHM $ at positions $ X_1 $ and $ X_2 $ are $ V_1 $ and $ V_2 $ respectively. Its time period will be
The time required for the light to pass through a glass slab (refractive index = $1.5$) of thickness $4 \,mm$ is ($c = 3 \times 10^8\, ms^{-1}$, speed of light in free space).
The statement "Polarity of induced emf is such that it tends to produce a current which opposes the change in magnetic flux that produced it" is known as
The unit of thermal conductivity is :
The plane of a dip circle is set in the geographic meridian and the apparent dip is $\delta_1$. It is then set in a vertical plane perpendicular to the geographic meridian. The apparent dip angle is $\delta_2$. The diclination $\theta$ at the plane is
The minimum force required to start pushing a body up a rough (frictional coefficient $\mu$) inclined plane is $F_1$ while the minimum force needed to prevent it from sliding down is $F_2$. If the inclined plane makes an angle $\theta$ from the horizontal such that tan $\theta$ = 2$\mu$ then the ratio $\frac{F_{1}}{F_{2}}$ is :
The magnetic field at $P$ on the axis of a solenoid having $100$ turn/ $m$ and carrying a current of $5\, A$ is
The kinetic energy of a particle moving along a circle of radius $R$ is $K$. The force acting on the particle is
A steel wire is $1 \,m$ long and has $ 1\, mm^2 $ area of cross-section. If it takes $200\, N$ to stretch thin wire by $1 \,mm$, how much force will be required to stretch a wire of same material and diameter from its normal length of $10\, m$ to a length of $10.02 \,m$?
The distance between the sun and the earth be $r$, then the angular momentum of the earth around the sun is proportional to