List of top Physics Questions

When a low flying aircraft passes over head, we sometimes notice a slight shaking of the picture on our $TV$ screen. This is due to
A straight wire of mass $200\, g$ and length $1.5\, m$ carries a current of $2\, A$. It is suspended in mid-air by a uniform horizontal magnetic field $B$. The magnitude of $B$ (in tesla) is (assume $g=9.8\, ms ^{-2}$ )
According to classical theory of Rutherford's model, the path of electron will be
An unpolarised beam of intensity $I_{0}$ is incident on a pair of nicols making an angle of $60^{\circ}$ with each other. The intensity of light emerging from the pair is
A diverging meniscus lens of $ 1.5 $ refractive index has concave surfaces of radii $ 3 $ and $ 4\,cm. $ The position of the image, if an object is placed $ 12\,cm $ in front of the lens, is
A converging lens forms a real image $I$ of an object on its principal axis. A rectangular slab of refractive index $\mu$ and thickness $x$ is introduced between $I$ and the lens, $I$ will move
A coin is placed on a horizontal platform which undergoes vertical simple harmonic motion of angular frequency $ \omega $ . The amplitude of oscillation is gradually increased. The coin will leave contact with the platform for the first time
A clock which keeps correct time at $20^{\circ} C$, is subjected to $40^{\circ} C .$ If coefficient of linear expansion of the pendulum is $12 \times 10^{-6} /{ }^{\circ} C$. How much will it gain or lose time ?
A parachutist after bailing out falls $50\, m$ without friction. When parachute opens, it decelearates at $ 2\,m/s^{2} $ . He reaches the ground with a speed of $3 \,m/s$. At what height, did he bail out?
A car, starting from rest, accelerates at the rate $f$ through a distance $S$, then continues at constant speed for time $t$ and then decelerates as the rate $f / 2$ to come to rest. If the total distance travelled is $15 S$, then
A smooth block is released at rest on a $45^{\circ}$ incline and then slides a distance $d$. The time taken to slide is $n$ times as much to slide on rough incline than on a smooth incline. The coefficient of friction is
A hollow cylinder has a charge $q\,\, C$ within it. If $ \Phi $ is the electric flux in unit of voltmeter associated with the curved surface $B$, the flux linked with the plane surface $A$ in unit of voltmeter will be
A particle of mass $10\, g$ is kept on the surface of a uniform sphere of mass $100\, kg$ and radius $10 \,cm$. Find the work to be done against the gravitational force between them, to take the particle far away from the sphere (you may take $G=6.67 \times 10^{-11} Nm ^{2} / kg ^{2}$ )
If in a p-n junction diode, a square input signal of $10 \,V$ is applied as shown
Then the output signal across $ R_L$ will De
For the given uniform square lamina $ABCD$, whose centre is $O$
A wheel has angular acceleration of $ 3.0\,rad/s^{2} $ and an initial angular speed of $2.00 \,rad/s$. In a time of $2 \,s$ it has rotated through an angle (in radian) of
A bullet is fired from a rifle and the rifle recoils. Kinetic energy of rifle is
A boy playing on the roof of a 10 m high building throws a ball with a speed of 10 m/s at an angle of $ 30{}^\circ $ with the horizontal. How far from the throwing point will the ball be at the height of 10 m from the ground? $ (g=10\,m/{{s}^{2}},\,\sin {{30}^{o}}=1/2,\,\cos {{30}^{o}}=\sqrt{3}/2) $
A stress of $3.18 \times 10^{8} Nm ^{-2}$ is applied to a steel rod of length $1\, m$ along its length. Its Young's modulus is $2 \times 10^{11} N-m^{-2}$. Then, the elongation produced in the rod (in $mm$ ) is
A sphere of mass $m$ moving with constant velocity $ u $ , collides with another stationary sphere of same mass. If $e$ is the coefficient of restitution, the ratio of the final velocities of the first and second spheres is
A body of mass $ 2\,kg $ is thrown up vertically with kinetic energy of $ 490\,J $ . If $ g=9.8\,m/s^{2} $ , the height at which the kinetic energy of the body becomes half of the original value, is
The apparent weight of a person inside a lift is $ w_{1}$ when lift moves up with a certain acceleration and is $ w_{2}$ when lift moves down with same acceleration. The weight of the person when lift moves up with constant speed is
If force $ (F) $ , work $ (W) $ and velocity $ (V) $ are taken as fundamental quantities, then the dimensional formula of time $ (T) $ is
In Ramsden eye-piece the focal length of each lens is $F$ . The distance of the image formed by the objective lens from the eye lens is
A body is thrown vertically up with certain initial velocity. The potential and kinetic energies of the body are equal at a point $P$ in its path. If the same body is thrown with double the velocity upwards, the ratio of potential and kinetic energies of the body when it crosses the same point, is