List of top Physics Questions

Choose correct graph of electric potential for uniformly charged hollow sphere.

Choose correct graph of resistivity and temperature for semi-conductor material.

Find moment of inertia about axis shown which is equidistant from both spheres

If the initial velocity in horizontal direction of a projectile is unit vector $\hat i$ and the equation of trajectory is $y = 5x(1 – x)$. The y component vector of the initial velocity is ______ $\hat j$.
(Take $g=10\ m/s^2$)

A √(34) m long ladder weighing 10 kg leans on a frictionless wall. Its feet rest on the floor 3 m away from the wall as shown in the figure. If F_f and F_w are the reaction forces of the floor and the wall, then ratio of F_w/F_f will be:
(Use g = 10 m/s²)

In the circuit given below, if the equivalent resistance is 10 Ω, find the value of R.

In the arrangement shown in figure a₁, a₂, a₃ and a₄ are the accelerations of masses m₁, m₂, m₃ and m₄ respectively. Which of the following relation is true for this arrangement

What is the density of water in kgdm^–3 if its density in gcm^–3 is 0.863?

A plane of electromagnetic waves travels in a medium with a relative permeability of 1.61 and relative permittivity of 6.44. If the magnitude of magnetic intensity is 4.5 × 10^–2 Am^–1at a point, what will be the approximate magnitude of electric field intensity?(Given: Permeability of free space μ₀ = 4π × 10^–7 NA^–2, speed of light in vacuum c = 3 × 10⁸ ms^–1)

A uniform metal chain of mass m and length ‘$L$’ passes over a massless and frictionless pully. It is released from rest with a part of its length ‘$l$’ is hanging on one side and rest of its length '$L – l$' is hanging on the other side of the pully. At a certain point of time, when $l = L/x$, the acceleration of the chain is $g/2$. The value of $x$ is ______.

If momentum [P], area [A] and time [T] are taken as fundamental quantities, then the dimensional formula for the coefficient of viscosity is

A girl standing on road holds her umbrella at 45° with the vertical to keep the rain away. If she starts running without umbrella with a speed of $15\sqrt2$ $kmh^{–1}$, the rain drops hit herhead vertically. The speed of rain drops with respect to the moving girl is

If $t = \sqrt{x} + 4$, then $\left.\frac{dx}{dt}\right|_{t=4}$ is

If two vectors P = $\hat{i} $+2m$\hat{j}$+m$\hat{k}$ & Q = 4$\hat{i}$-2$\hat{j}$+m$\hat{k}$ are perpendicular to each other, then the value of m will be:

In the following circuit $C_1=12 \mu F, C_2=C_3=4 \mu F$ and $C_4=C_5=2 \mu F$.The Charge stored in $C_3$ is ___$\mu C$

A ball is thrown vertically upwards with a velocity of $19.6 ms^{–1}$ from the top of a tower. The ball strikes the ground after $6 s$. The height from the ground up to which the ball can rise will be $(k/5) m$. The value of k is ______ (use $g = 9.8 m/s^2$)

In a Vernier Calipers, 10 divisions of Vernier scale is equal to the 9 divisions of main scale. When both jaws of Vernier calipers touch each other, the zero of the Vernier scale is shifted to the left of zero of the main scale and 4th Vernier scale division exactly coincides with the main scale reading. One main scale division is equal to 1 mm. While measuring diameter of a spherical body, the body is held between two jaws. It is now observed that zero of the Vernier scale lies between 30 and 31 divisions of main scale reading and 6th Vernier scale division exactly coincides with the main scale reading. The diameter of the spherical body will be

An expression of energy density is given by
$u = \frac{α}{β} sin (\frac{αx}{kt})$
, where α, β are constants, x is displacement, k is Boltzmann constant and t is the temperature. The dimensions of β will be

The de-Broglie wavelength of an electron moving with a velocity $ \frac{c}{3} $ (where $ c = 3 \times 10^8 \, {m/s} $) is equal to the wavelength of a photon. The ratio of the kinetic energies of the electron and the photon is:

Time taken by light to travel in two different materials A and B of refractive indices μ_Aand μ_B of same thickness is t₁ and t₂ respectively. If t₂ – t₁ = 5 × 10^–10 s and the ratio of μA to μB is 1 : 2. Then, the thickness of material, in meter is: (Given v_A and v_B are velocities of light in A and B materials, respectively.)

A square laminar sheet with side a and mass M, has mass per unit area given by $\sigma(x)=\sigma_0[1-\frac{x}{a}]$, (see figure). Moment of inertia of the sheet about y-axis is

To a bird in air, a fish in water appears to be at 30 cm from the surface. If refractive index of water with respect to air is $\frac {4}{3}$ ,the real distance of bird from the surface is

A person moved from A to B on a circular path as shown in figure If the distance travelled by him is 60 m, then the magnitude of displacement would be Given ( Cos 135° = -0.7)

A proton moves with a velocity of 5 x 10⁶ j m/s, through the uniform electric field E = 4 x 10⁶ (2i + 0.2j + 0.1k) Vm^-1and the uniform magnetic field B = 0.2( i + 0.2 j + k) T. The approximate net force acting on the proton is

Two identical positive charges Q each are fixed at a distance of 2a apart from each other. Another point charge q₀ with mass m is placed at midpoint between two fixed charges. For a small displacement along the line joining the fixed charges, the charge q₀ executes SHM. The time period of oscillation of charge q₀ will be