List of top Physics Questions

The velocity \(v\) of a particle as a function of time t is given by \(v(t) = v_0 (1 – e^{–αt})\). The dimension of \(v_0/α\) is

A thin uniform rod of length L and mass M is swinging freely about a horizontal axis passing through its end. Its maximum angular speed is ω. Its centre of mass rises to a maximum height of

A particle moves along x-axis following the relation x = 4(t-2)+a(1-2)², where x is the distance travelled in time t. In that case, which of the following statement(s) is/are true?

As shown above, a hollow cylinder has a charge q within it. If Φ is the electric flux through the curved surface ‘B’, then the flux linked with the plane surface ‘A’ is,

The variation of voltage V with charge Q of a capacitor is shown in the figure. The area of the triangle OAB represents,

The given figure shows the variation of pressure P versus density ρ for an ideal gas at two temperatures T₁ and T₂. Then,

A particle is moving in a straight line with simple harmonic motion of amplitude ‘A’. At a distance B from the mean position, the particle receives a blow in the direction of motion which instantaneously doubles the velocity. The new amplitude A' will be,

An electron of mass m and a photon have same energy E. If their de Broglie wavelengths \(λ\) are \(λ_e\) and \(λ_p\), respectively, then \(\frac{λ_e}{λ_p}\) is proportional to,

An artificial satellite is moving in a circular orbit around the earth with a speed equal to half the magnitude of the escape velocity from the earth's surface. The height of the satellite above the earth's surface is [R = Radius of the earth]

An electron, an \(\alpha\)-particle and a proton have the same kinetic energy. which of these has the longest de Broglie wavelength? 

If the height of the tower used for L.D.S is increased by 21% then percentage change in range is?

A body is doing SHM with amplitude A. When it is at \( x =+ \frac{A}{2}\) , find ratio of kinetic energy to potential energy.

What is the correct expression for enthalpy?

Time taken by light to travel in two different materials $A$ and $B$ of refractive indices $\mu_{ A }$ and $\mu_{ B }$ of same thickness is $t _1$ and $t _2$ respectively If $t_2-t_1=5 \times 10^{-10} s$ and the ratio of $\mu_{ A }$ to $\mu_{ B }$ 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)

\(S_1\) and \(S_2\) are two identical sound sources of frequency \(656\) \(Hz\). The source \(S_1\) is located at \(𝑂\) and \(𝑆_2\) moves anti-clockwise with a uniform speed \(4\sqrt2\)  \(m s ^{−1}\) on a circular path around \(𝑂\), as shown in the figure. There are three points \(𝑃\), \(𝑄\) and \(𝑅\) on this path such that \(𝑃\) and \(𝑅\) are diametrically opposite while \(𝑄\) is equidistant from them. A sound detector is placed at point \(𝑃\). The source \(𝑆_1\) can move along direction \(𝑂𝑃\). [Given: The speed of sound in air is \(324\) \(m s ^{−1}\) ]

When someone punches a wall, there is no visible effect upon it. This example can be used to teach?
(1) Law of conservation of energy can be violated in specific cases 
(2) Law of conservation of energy can never be violated. 
(3) Sometimes energy is invisible and needs to be visualised. 
(4) Sometimes there is no effect of force on energy.

A string of length 1m and mass 2 x 10^-5 kg is under tension T. When the string vibrates two successive harmonics are found to occur at frequencies 750 Hz and 1000 Hz. The value of tension is ___ Newton.

A circular ring is placed in magnetic field of 0.4 T. Suddenly its radius starts shrinking at the rate of 1 mm/s. Find the induced emf in the ring at r = 2 cm.

Assertion (A): An electrical dipole is enclosed in a closed gaussian surface. The total flux through the enclosed surface is zero. 
Reason (R): Net charge inside the enclosed surface is zero.

Consider an LC circuit, with inductance $L =01 H$ and capacitance $C=10^{-3} F$, kept on a plane The area of the circuit is $1 \,m ^2$ It is placed in a constant magnetic field of strength $B_0$ which is perpendicular to the plane of the circuit At time $t=0$, the magnetic field strength starts increasing linearly as $B=B_0+\beta t$ with $\beta=004\, Ts ^{-1}$ The maximum magnitude of the current in the circuit is ___$ m A$

Equation of progressive wave is \(y = A\text{ sin}(160t-0.5x)\). Let the speed of the wave be 10x then, find x.

Electric field due to a dipole at a equatorial point depends upon r-n . Value of n is

If the length of a conductor is increased by 20% and cross-sectional area is decreased by 4% ,then calculate the percentage change in the resistance of the conductor.

A wire of length 2 m, radius of cross-section 20 mm and Young's Modulus 2×10¹¹ N/m is subjected to a force of 62.8 kN.The change in length of the wire is p×10^–5 (in m). Find P.