List of top Physics Questions

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 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:
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 $O_2 = 32\text{ g/mol}$, $He = 4\text{ g/mol}$)
The ratio of the stress to the strain within the elastic limit is called
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
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 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:
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 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:
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:
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:
If the dimensional formula of a physical quantity is $[M^1 L^2 T^{-2}]$, then the quantity 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 long solenoid has \(500\) turns per meter and carries a current of \(5\,\text{A}\). Magnetic field inside the solenoid is: (\(\mu_0 = 4\pi \times 10^{-7}\))
In a loop, EMF \(= 10\,\text{V}\) and total resistance \(= 5\,\Omega\). Current in circuit is:
A capacitor of capacitance \(2\,\mu\text{F}\) is charged to \(10\,\text{V}\). Energy stored is:
Two charges \(+2\,\mu\text{C}\) and \(-2\,\mu\text{C}\) are placed \(2\,\text{m}\) apart. Electric field at midpoint is:
Water flows in a horizontal pipe. At a point where speed is \(2\,\text{m/s}\), pressure is \(2000\,\text{Pa}\). At another point, speed becomes \(4\,\text{m/s}\). Find pressure at second point. (Density \(= 1000\,\text{kg/m}^3\))
Pressure of \(2 \times 10^6\,\text{Pa}\) causes volume decrease of \(0.1\%\) in a material. Bulk modulus is:
At what depth inside Earth does g become half of its surface value? (Earth radius = R)
A force F = 6t acts on a body of mass 2 kg initially at rest. Find velocity at t = 2 s.
The velocity-time graph of a particle is given by v = 4t. The acceleration is:
The measured value of a quantity is 98 units, while the true value is 100 units. The percentage error is:
In an EM wave, electric field amplitude is \( 300\,\text{V/m} \). Magnetic field amplitude is:
At a place, horizontal component of Earth's field is \( 0.3\,\text{T} \) and angle of dip is \( 60^\circ \). Total magnetic field is: