List of top Physics Questions

A transverse wave is represented by $y = A \sin(kx - \omega t)$. The maximum particle velocity is

The electric potential at a distance $r$ from a point charge $q$ is proportional to

The time period of a simple pendulum of length $l$ is $T$. If its length is increased to $4l$, its new time period will be

The rate of flow of a liquid through a capillary tube of radius $r$ and length $l$ under a pressure difference $P$ is proportional to

A copper rod and an iron rod of the same length have their temperature raised by the same amount. If the coefficient of linear expansion of copper is greater than that of iron, then

A liquid rises to a height of $4 \text{ cm}$ in a capillary tube of radius $r$. If another capillary tube of radius $r/2$ is dipped in the same liquid, the height of liquid rise will be}

The mean free path of a gas molecule is inversely proportional to

The specific heat capacity of a gas at constant pressure ($C_p$) and at constant volume ($C_v$) are related as

The efficiency of a Carnot engine working between temperatures $127^\circ\text{C}$ and $27^\circ\text{C}$ is}

In an isothermal process, which of the following remains constant?

At what temperature is the root mean square (rms) speed of oxygen molecules ($O_2$) equal to that of helium molecules ($He$) at $27^\circ\text{C}$? (Given molar mass of $O_2 = 32\text{ g/mol}$, $He = 4\text{ g/mol}$)}

A Carnot engine operates between a heat source at $T_1 = 600\text{ K}$ and a sink at $T_2 = 300\text{ K}$. If the engine absorbs $1000\text{ J}$ of heat from the source per cycle, the work done per cycle is:

Two copper wires of length $L$ and $2L$ have radii $r$ and $2r$ respectively. If they are subjected to the same tension force, the ratio of their extension ($\Delta L_1 / \Delta L_2$) is:

The acceleration due to gravity at a height $h$ above the Earth's surface is the same as that at a depth $d$ below the surface. If both $h$ and $d$ are much smaller than the radius of Earth $R$, then the relation between $h$ and $d$ is:

The time period of a simple pendulum is $T$ in air. When the bob is completely immersed in a non-viscous liquid of density $\rho / 10$ (where $\rho$ is the density of the bob), the new time period of oscillation is: [H] [width=0.5\linewidth]{86.png}

The ratio of the stress to the strain within the elastic limit is called

An engine pumps water continuously through a hose pipe. If the water leaves the pipe with velocity $v$ and $m$ is the mass per unit length of the water in the pipe, then the rate at which kinetic energy is imparted to the water is:

A lift of mass $M$ is accelerating upwards with an acceleration $a$. If the tension in the supporting cable is $T_1$ during upward acceleration and $T_2$ when it accelerates downwards with the same acceleration $a$, then the ratio $T_1 / T_2$ is:

A projectile is launched from the ground with an initial velocity $v$ at an angle $\theta$ to the horizontal. If its horizontal range is equal to its maximum height, then the value of $\tan \theta$ is:

A thin circular ring of mass $M$ and radius $R$ is rotating about its central axis with a constant angular velocity $\omega$. Two objects, each of mass $m$, are gently attached to the opposite ends of a diameter of the ring. The new angular velocity of the ring is: [H] [width=0.5\linewidth]{85.png}

If the dimensional formula of a physical quantity is $[M^1 L^2 T^{-2}]$, then the quantity is:

The most exotic diamagnetic materials are superconductors. They exhibit perfect diamagnetism and perfect conductivity. The values of magnetic susceptibility \((\chi)\) and relative permeability \((\mu_r)\) for such materials are:

A straight wire of mass \(500\,\text{g}\) and length \(7\,\text{m}\) carries a current of \(1.4\,\text{A}\). It is suspended in mid-air by a uniform horizontal magnetic field \(B\) perpendicular to the length of the wire. The magnitude of the magnetic field is:

If a straight wire of length \(175\,\text{cm}\) and mass \(250\,\text{g}\) is suspended freely in a uniform horizontal magnetic field of \(0.7\,\text{T}\), then the current flowing through the wire is:

For the given mixed combination of resistors, calculate the total resistance between points \(A\) and \(B\).