List of top Physics Questions

The path difference produced by two waves is 3.75 $\mu$m and the wavelength is 5000 $\mathring {A}$. The point is
In a circuit, L,C and R are connected in series with an alternating voltage source of frequency f. The current leads the voltage by 45°.The value of C is:
As a result of change in the magnetic flux linked to the closed loop as shown in the figure, an e.m.f. V volt is induced in the loop. The work done (joule) in taking a charge Q coulomb once along the loop is
A point source emits sound equally in all directions in a non-absorbing medium. Two points P and Q are at distances of 2 m and 3 m respectively from the source. The ratio of the intensities of the waves at P and Q is
The simple pendulum acts as second's pendulum on earth. Its time on a planet, whose mass and diameter are twice that of earth is
A ball is thrown vertically upward. It has a speed of 10m/s when it has reached one half of its maximum height. How high does the ball rise?(Taking g=10 m/s2)
A tuning fork arrangement (pair) produces 4 beats/sec with one fork of frequency 288 .cps. A little wax is placed on the unknown fork and it then produces 2 beats/sec. The frequency of the unknown folk is:
In the nuclear reaction, ${ }_{72} X^{180} {->[-\alpha]} Y {->[-\beta]} Z {->[-\alpha]} A {->[-\gamma]} P$ the atomic mass and atomic number of $P$ are, respectively
If the magnetic dipole moment of an atom of diamagnetic material, paramagnetic material and ferromagnetic material are denoted ny $\mu_d, \mu_p$ and $\mu_f$ respectively, then
The displacement x of a particle varies with time t as $x = ae^{-\alpha t}+be^{\beta t}$ where a, b, $\alpha$ and $\beta$ are positive constants. The velocity of the particle will
Escape velocity for 'a projectile at Earth's surface is v,. A body is projected from earth's surface with velocity $2v_e$. The velocity of the body when it is at infinite distance from the centre of the Earth is
If the length of rod $A$ is $ 3.25\pm 0.01\,cm $ and that of $B$ is $ 4.19\pm 0.01\,cm, $ then the rod $B$ is longer than rod $A$ by
For protecting a sensitive equipment from external magnetic field, it should be
Petrol engine does the work during
A circular coil of $20$ turns and radius $10 \,cm$ is placed in uniform magnetic field of $ 0.10\,T $ normal to the plane of the coil. If the current in coil is $5 \,A$, then the torque acting on the coil will be
One milligram of matter converted into energy, will give:
A perfect black body is one whose emissive power is
A geostationary satellite is revolving around the earth. To make it escape from gravitational field of earth, its velocity must be increased
The energy stored per unit volume in copper wire, which produces longitudinal strain of 0.1% is $(Y =1.1\times10^3 Nm^{-2})$
What is the mass of $ 2\,L $ of nitrogen at $ 22.4\,arm $ pressure and $ 273\,K $ ?
If a particle executes SHM with angular velocity $3.5 \,rad\, s^{-1}$ and maximum acceleration $7.5\, ms^{-2},$then the amplitude of oscillation will be
The electric field due to an electric dipole at a distance $r$ from its centre in axial position is $E$. If the dipole is rotated through an angle of $ 90^{\circ} $ about its perpendicular axis, the electric field at the same point will be
Two simple pendulums of lengths $ 1.44\,m $ and $ 1 m $ start swinging together. After how many vibrations will they again start swinging together?
Three sources of equal intensities with frequencies $400,401$ and $402\, vib/s$ are sounded together. The number of beat/s is
A wave has velocity $u$ in medium $P$ and velocity $ 2u $ in medium $Q$. If the wave is incident in medium $P$ at an angle $ 30^{\circ}, $ then the angle of refraction will be