List of top Physics Questions

If the kinetic energies of an electron, an alpha particle, and a proton having the same de-Broglie wavelength are $\varepsilon_1, \varepsilon_2, \varepsilon_3$ respectively, then
Suppose in a hypothetical world the angular momentum is quantized to be even integral multiples of $\frac{h}{2}$. The largest possible wavelength emitted by hydrogen atoms in the visible range in a world according to Bohr's model will be (consider $h_e = 1224$ MeV-fm)
When an AC source of EMF $E$ with frequency = 100 Hz is connected across a circuit, the phase difference between $E$ and current $I$ in the circuit is observed to be $\pi/4$ as shown in the figure. If the circuit consists of only RC or RL in series, then
When an AC source of EMF
Two wires $A$ and $B$ of the same length are made of the same material. The Load ($F$) vs. elongation ($x$) graph for these two wires is shown in the figure. Then which of the following statement(s) is/are true?
Two wires A and B of the same length are made of same material Load
If a string suspended from the ceiling is given a downward force $F_1$, its length becomes $L_1$. Its length is $L_2$ if the downward force is $F_2$. What is its actual length?
A particle is subjected to two simple harmonic motions in the same direction having equal amplitudes and equal frequency. If the resultant amplitude is equal to the amplitude of the individual motion, the phase difference $(\delta)$ between the two motions is
The electric potential for an electric field directed parallel to the X-axis is shown in the figure. Choose the correct plot of electric field strength.
A battery of emf E and internal resistance r is connected with an external resistance R as shown in figure. The battery will act as a constant voltage source if:
A battery of emf E and internal resistance r
The expression $A(A + B) + (B + AA)(A + B)$ simplifies to
Consider two concentric conducting spheres of radii $R$ and $2R$ respectively. The inner sphere is given a charge $+Q$. The other sphere is grounded. The potential at $r = \frac{3R}{2}$ is
Three particles, each of mass $m$ grams situated at the vertices of an equilateral $\Delta ABC$ of side $a$ cm (as shown in the figure). The moment of inertia of the system about a line $AX$ perpendicular to $AB$ and in the plane of $\Delta ABC$ in $g$-cm² units will be:
Three particles, each of mass
A straight wire is placed in a magnetic field that varies with distance $x$ from origin as $B = B_0 (2 - \frac{x}{n}) \hat{k}$. The ends of the wire are at $(a, 0)$ and $(2n, 0)$ and it carries a current $I$. If the force on the wire is $F = 1 B_0 \left(\frac{k a}{2}\right) \hat{j}$, then the value of $k$ is
Given: The percentage error in the measurements of A, B, C, and D are respectively 4%, 2%, 3%, and 1%. The relative error in $Z = \frac{A^4 B^{1/3}}{C D^{3/2}}$ is
A rod of length $50\ \text{cm}$ is pivoted at one end. It is raised such that it makes an angle of $30^\circ$ from the horizontal as shown and released from rest. Its angular speed when it passes through the horizontal (in rad s$^{-1}$) will be
A long cylindrical rod is welded to a thin circular disc of diameter $0.5\,\text{m}$ at a point on its circumference. The rod is in the same plane as that of the disc and forms a tangent to the disc. The radius of gyration of the disc about the rod (in m) is
Moon is revolving in a circular orbit of radius $60R$ ($R=$ radius of earth). Assume that the radius of the moon is $\dfrac{R}{4}$. If the moon is stopped for an instant and then released, it will fall towards the earth. Ignoring atmospheric friction, the velocity of the moon just before it strikes the earth is (Take $g=$ acceleration due to gravity at the surface of earth)
An ideal gas enclosed in a cylinder is at pressure $2$ atm and temperature $300\,\text{K}$. The mean time between two successive collisions is $6\times10^{-8}\,\text{s}$. If the pressure is doubled and temperature is increased to $500\,\text{K}$, the mean time between two successive collisions will be close to
Two point charges $q_1(\sqrt{10}\,\mu\text{C})$ and $q_2(-25\,\mu\text{C})$ are placed on the $x$-axis at $x=1\,\text{m}$ and $x=4\,\text{m}$ respectively. The electric field (in V/m) at a point $y=3\,\text{m}$ on the $y$-axis is (take $\dfrac{1}{4\pi\varepsilon_0}=9\times10^9\,\text{Nm}^2\text{C}^{-2}$)
A proton accelerated by a potential difference $V=500\,\text{kV}$ moves through a transverse magnetic field $B=0.51\,\text{T}$ as shown in the figure. The width of the magnetic field region is $d=10\,\text{cm}$. Then the angle $\theta$ through which the proton deviates from the initial direction of its motion is (approximately)
If $\lambda_1$ and $\lambda_2$ are the wavelengths of the photons emitted when an electron in the $n^{\text{th}}$ orbit of a hydrogen atom falls to the first excited state and the ground state respectively, then the value of $n$ is
The energy released per fission of ${}^{235}_{92}\mathrm{U}$ is $200\,\text{MeV}$. The fission rate of ${}^{235}_{92}\mathrm{U}$ required to produce $2\,\text{W}$ power is
For the following question, enter the correct numerical value upto TWO decimal places. If the numerical value has more than two decimal places, round-off the value to TWO decimal places. (For example: Numeric value 5 will be written as 5.00 and 2.346 will be written as 2.35) A body moves along a circular path of radius 10 m and the coefficient of friction is 0.5. What should be its angular velocity in rad/s if it is not to slip from the surface? ____. (\(g = 9.8 \, \text{m s}^{-2}\))
For the following question, enter the correct numerical value upto TWO decimal places. If the numerical value has more than two decimal places, round-off the value to TWO decimal places. (For example: Numeric value 5 will be written as 5.00 and 2.346 will be written as 2.35) On interchanging the resistances, the balance point of a meter bridge shifts to the left by 10 cm. The resistance of their series combination is 1 k\(\Omega\). How much was the resistance on the left slot before interchanging the resistances? ____ \(\Omega\).
For the following question, enter the correct numerical value upto TWO decimal places. If the numerical value has more than two decimal places, round-off the value to TWO decimal places. (For example: Numeric value 5 will be written as 5.00 and 2.346 will be written as 2.35) A 1 kW carrier is modulated to a depth of 80%. The total power in the modulated wave is ____ kW.
For the following question, enter the correct numerical value upto TWO decimal places. If the numerical value has more than two decimal places, round-off the value to TWO decimal places. (For example: Numeric value 5 will be written as 5.00 and 2.346 will be written as 2.35) A mass of 10 kg is suspended vertically by a rope from the roof. When a horizontal force is applied on the rope at some point, the rope deviates at an angle of \(45^\circ\) at that point. If the suspended mass is at equilibrium, the magnitude of the force applied is ____ N. (\(g = 10 \, \text{m s}^{-2}\))