List of top Physics Questions

The weight of a body at a height of 3$R_E$ from the surface of the earth is 90 N, where $R_E$ is the radius of the earth. The weight of the same body at a height of $R_E$ from the surface of the earth is:
The displacement of a body executing simple harmonic motion is $y = 8\cos(\pi t)$ cm. The displacement of the body in the time interval between 1.5 s and 2.5 s is:
A uniform circular disc of mass $\dfrac{\pi}{40}$ kg is rotating about an axis passing through its center and perpendicular to its plane with an angular speed of 150 rev/min. If the angular momentum of the disc is 6.25 Js, then its radius is:
A uniform metre scale of mass 700 g is suspended horizontally using two strings tied at 20 cm and 70 cm marks on the scale. The tension in the string at 70 cm mark is (Acceleration due to gravity = 10 m/s$^2$):
The blades of a windmill generating electrical energy sweep out an area of 20 m$^2$. If the efficiency of the windmill is 25% and wind speed is 36 kmph, then the electrical power generated is (Density of air = 1.2 kg m$^{-3}$):
A bullet of mass $m$ moving with a velocity $u$ gets embedded in a block of mass $M$ initially at rest. If $\mu$ is the coefficient of friction between the block and the ground, then the displacement of the block due to the impact is:
A ball of mass 250 g moving with a speed of 72 kmph is deflected by a batsman by an angle of 120$^\circ$ without changing its initial speed. The impulse imparted to the ball is:
A cannon on a cliff 55 m above the ground fires a shell with a velocity of \(50\hat{i}+50\hat{j}\) ms\textsuperscript{−1}. The displacement vector of the shell when it hits the ground is (Acceleration due to gravity = 10 ms\textsuperscript{−2})
A motor cyclist is travelling towards north with a uniform speed of 10 ms\textsuperscript{−1} and a train is travelling towards north-west with a uniform speed of 102 ms\textsuperscript{−1}. The direction of motion of the motor cyclist as observed by a passenger in the train is
If the relative error in the determination of area of a body is 0.08, then the percentage error in the determination of its volume is
In the $\beta^{+}$ decay, the particle emitted along with neutron and positron is

The motion of an airplane is represented by the velocity-time graph as shown below. The distance covered by the airplane in the first 30.5 seconds is                km.

A motor cyclist has to rotate in horizontal circles inside the cylindrical wall of inner radius 'R' metre. If the coefficient of friction between the wall and the tyres is '$\mu_s$', then the minimum speed required is ( g = acceleration due to gravity)
The motion of the particle is given by the equation x = A $\sin \omega t$ + B $\cos \omega t$. The motion of the particle is
For an experimental expression \( y = \frac{32.3 \times 1125}{27.4} \), where all the digits are significant. Then to report the value of \( y \), we should write:
A (2.5 V) battery is connected to a potentiometer wire. A cell of e.m.f. (1.08 V) is balanced by the voltage drop across (2.16 m) of wire. The length of the potentiometer wire is
A photon has energy of \(3.1\times10^{-19}\ \text{J}\). Its wavelength (in \(\AA\)) is _ _ _. (round off to one decimal place)
A ball is thrown vertically upward with a speed of \(19.6\ \text{m/s}\). The value of acceleration due to gravity at that place is \(9.8\ \text{m/s}^2\). The maximum height (in cm) that the ball reaches is _ _ _. (in integer)
Consider that \(M\), \(L\), and \(T\) indicate mass, length and time, respectively. If \([ML^2T^{-n}]\) is the dimensional formula for the physical quantity Torque, then the value of \(n\) is _ _ _. (in integer)
If a light beam (solid arrow in the shown figure) is entering from Air medium to Glass medium (having refractive index of \(1.5\)), then while entering
The capacitance of a parallel plate capacitor will get doubled if
If a simple pendulum has length \(l\) and time period \(T\) then a pendulum of length \(2l\) will have a time period of
Consider a block of mass \(m\) hanging using a string and pulley arrangement, as shown in the figure. The weight \(mg\) and tension \(T\) are working on the block in such a way that the block is not moving and the string is parallel to the perfectly vertical wall. If the block is just in contact but not attached/fixed with the wall and the coefficient of static friction is \(\mu\), then the static frictional force acting on the block is

A point particle of charge \( Q \) is located at \( P \) along the axis of an electric dipole 1 at a distance \( r \) as shown in the figure. The point \( P \) is also on the equatorial plane of a second electric dipole 2 at a distance \( r \). The dipoles are made of opposite charge \( q \) separated by a distance \( 2a \). For the charge particle at \( P \) not to experience any net force, which of the following correctly describes the situation?


 

The expression given below shows the variation of velocity \( v \) with time \( t \): \[ v = At^2 + \frac{Bt}{C + t}. \] The dimension of \( ABC \) is: