List of top Physics Questions

A screw gauge has a least count of $0.01$ mm. Using this screw gauge a measurement was done. When nothing was present in the jaw, zero of circular scale was above reference line by $3$ units. When a sphere was kept between the jaws, main scale reads $1$ mm and $51^{\text{st}$ division of circular scale coincides with reference line. Find the actual diameter of the ball:}

Masses $m$ and $2m$ are connected by a massless rod of length $d$. If angular momentum about an axis passing through centre of mass and perpendicular to the rod is $L$, then the angular speed $(\omega)$ of the system is:

Figure beside represents strain versus stress graph for four materials $A, B, C$ and $D$. Which material has maximum Young's modulus?
A set of measurements of a certain parameter is: $20.00,\; 19.75,\; 18.25,\; 17.01$. Find the relative error for the set of measurements.
Among the given options choose the correct energy of transition:

All are cylindrical rods having radius of cross-section $R$ and mass of each rod $\dfrac{M}{4}$. Find the moment of inertia about $yy'$ axis:

A projectile is projected with speed $v$ at an angle $60^\circ$ with the horizontal. Find the ratio of the difference of kinetic energies at point $C$ (at ground) and point $B$ (at highest point) with the kinetic energy at point $C$ as shown in the diagram:
The RMS speeds of \( \mathrm{H_2} \) and \( \mathrm{O_2} \) gases are the same. If the temperature of \( \mathrm{O_2} \) gas is \(23^\circ\mathrm{C}\), find the temperature of \( \mathrm{H_2} \) gas.
A block of mass \(m\) is at rest with respect to a hollow cylinder which is rotating with angular speed \( \omega \). The radius of the cylinder is \(R\). Find the minimum coefficient of friction between the block and the cylinder.
Two balls of mass \(2m\) and \(m\) collide with a rod of mass \(m\) and length \(L\) as shown. The balls stick to the rod after collision. Find \( \dfrac{v}{\omega} \) if the rod is hinged at its centre. (Given: \( L = 8\,\text{m} \))
Find the volume flow rate in the Venturi meter shown below in which water is flowing. Given that the cross-sectional areas at \(A\) and \(B\) are \(A\) and \(a\) respectively, \[ \frac{A}{a} = 2, A = \sqrt{3}\,\text{m}^2, \] the difference in water levels is \(5\,\text{cm}\) and \(\rho = 1000\,\text{kg m}^{-3}\).
If the electric field of an EM wave is given by \[ 60\,[\sin(3\times10^{14}t) + \sin(12\times10^{14}t)] \] at \( x = 0 \) and it falls on a photosensitive material having work function \( 2.8\,\text{eV} \), find the maximum kinetic energy (in eV) of the ejected electrons.
Find the moment of inertia of the system formed using two identical rods about the given axis of rotation as shown in the figure. Each rod has mass \( M \) and length \( L \). v
An \( \alpha \)-particle having kinetic energy \(7.7\,\text{MeV}\) is approaching a fixed gold nucleus (atomic number \(Z = 79\)). Find the distance of closest approach.
Find dimensions of \( \dfrac{A}{B} \) if \[ \left( P + \frac{A^2}{B} \right) + \frac{1}{2}\rho V^2 = \text{constant}, \] where \( P \rightarrow \) pressure, \( \rho \rightarrow \) density, \( V \rightarrow \) speed.
Find the dimensions of the expression \( \dfrac{\varepsilon_0 E}{T} \), where \( \varepsilon_0 \), \(E\), and \(T\) are permittivity, electric field, and time respectively.
For the given logic gate, find the output function.
If a projectile is projected with speed \(v\) at an angle \(60^\circ\) with the horizontal, find the ratio of speed at the highest point (\(v_B\)) to the speed at the final point (\(v_C\)).
An object is being dropped from a height \(h\) above the ground. Apart from the force of gravity, an additional drag force \(F=-kv\) acts on the object. Find the correct graph of velocity \(v\) versus time \(t\).
There are three long parallel wires in a plane as shown. Find the force on \(15\) cm of length of the middle wire.
Which of the following material has bigger Young's modulus?
A particle moves along the \(x\)-axis and has its displacement \(x\) varying with time \(t\) according to the equation \[ x = c_0 (t^2 - 2) + c(t - 2)^2 \] where \(c_0\) and \(c\) are constants of appropriate dimensions. Which of the following statements is correct?
Given below are two statements:
Statement (I): The dimensions of Planck's constant and angular momentum are same.
Statement (II): In Bohr's model, electrons revolve around the nucleus only in those orbits for which angular momentum is an integral multiple of Planck's constant.
In the light of the above statements, choose the most appropriate answer from the options given below:
A block of mass \( m \) is at rest w.r.t. a hollow cylinder which is rotating with angular speed \( \omega \), radius of the cylinder is \( R \). Find the minimum coefficient of friction between the block and the cylinder.
RMS speed for \( \mathrm{H_2} \) and \( \mathrm{O_2} \) are same. If temperature of \( \mathrm{O_2} \) gas is \( 23^\circ\text{C} \), find the temperature of \( \mathrm{H_2} \) gas.