List of top Physics Questions

A ball dropped from a point A falls down vertically to C, through the midpoint B. The descending time from A to B and that from A to C are in the ratio
The magnitudes of a set of 3 vectors are given below. The set of vectors for which the resultant cannot be zero is
A cricket ball is hit at an angle of 30° to the horizontal with a kinetic energy E. Its kinetic energy when it reaches the highest point is
The time required to stop a car of mass 800 kg, moving at a speed of 20 ms\(^{-1}\) over a distance of 25 m is
If n bullets each of mass \(m\) are fired with a velocity \(v\) per second from a machine gun, the force required to hold the gun in position is
From a balloon moving upwards with a velocity of 12 ms\(^{-1}\), a packet is released when it is at a height of 65 m from the ground. The time taken by it to reach the ground is (g = 10 ms\(^{-2}\))
If the displacement of a body varies as the square of elapsed time, then its
A bus is moving with a velocity of 10 ms\(^{-1}\) on a straight road. A scooterist wishes to overtake the bus in one minute. If the bus is at a distance of 1.2 km ahead, then the velocity with which he has to chase the bus is
A force F is applied onto a square plate of side L. If the percentage error in determining L is 2% and that in F is 4%, the permissible percentage error in determining the pressure is
The physical quantity that does not have the dimensional formula \( [ML^{-1}T^{-2}] \) is
The enolic form of ethyl acetoacetate as below has
The fundamental frequency of a closed organ pipe of length $20\,cm$ is equal to the second overtone of an organ pipe open at both the ends. The length of organ pipe open at both the ends is
The heart of a man pumps $5$ litres of blood through the arteries per minute at a pressure of $150 \,mm$ of mercury. If the density of mercury be $13.6 \times 10^3$ $kg/m^3$ and $g$ = $10\, m/s^2$ then the power
A simple harmonic oscillator of angular frequency $2 \,rad \,s^{-1}$ is acted upon by an external force $F= \sin\, t \,N$. If the oscillator is at rest in its equilibrium position at $t\, =\, 0$, its position at later times is proportional to :
A projectile is thrown in upward direction making an angle of 60° with the horizontal direction with a velocity of 150 ms\(^{-1}\). Then, the time after which its inclination with horizontal is 45°, is
In Young's double slit experiment, fringes of width \(\beta\) are produced on the screen kept at a distance of 1 m from the slit. When the screen is moved away by \(5 \times 10^{-2}\) m, fringe width changes by \(3 \times 10^{-5}\) m. The separation between the slits is \(1 \times 10^{-3}\) m. The wavelength of light used is .................... nm.
A uniform rod of length 2 m, specific gravity 0.5 and mass 2 kg is hinged at one end to the bottom of a tank of water (specific gravity = 1.0) filled upto a height of 1 m as shown in the figure. Taking the case \(\theta \neq 0°\), the force exerted by the hinge on the rod is
When a copper sphere is heated, percentage change is
Find the frequency of light which ejects electrons from a metal surface fully stopped by a retarding potential of 3 V. The photoelectric effect begins in this metal at a frequency of \(6 \times 10^{15}\) Hz.
Out of a photon and an electron, the equation \(E = Pc\), is valid for
Equations of a stationary and a travelling waves are as follows: \(y_1 = a\sin kx\cos\omega t\) and \(y_2 = a\sin(\omega t - kx)\). The phase difference between two points \(x_1 = \dfrac{\pi}{3k}\) and \(x_2 = \dfrac{3\pi}{2k}\) are \(\phi_1\) and \(\phi_2\) respectively for two waves. The ratio \(\dfrac{\phi_1}{\phi_2}\) is
A small block of wood of specific gravity 0.5 is submerged at a depth of 1.2 m in a vessel filled with water. The vessel is accelerated upwards with an acceleration \(a_0 = g/2\). Time taken by the block to reach the surface, if it is released with zero initial velocity is
An electron beam accelerated from rest through a potential difference of 5000 V in vacuum is allowed to impinge on a surface normally. The incident current is 50 \(\mu\)A and if the electron comes to rest on striking the surface, the force on it is
Figure shows an irregular block of material of refractive index \(\sqrt{2}\). A ray of light strikes the face AB as shown in figure. After refraction, it is incident on a spherical surface CD of radius of curvature 0.4 m and enters a medium of refractive index 1.514 to meet PQ at E. Find the distance OE upto two places of decimal.
The frequency of sonometer wire is \(f\), but when the weights producing the tensions are completely immersed in water, the frequency becomes \(f/2\) and on immersing the weights in a certain liquid, the frequency becomes \(f/3\). The specific gravity of the liquid is