List of top Physics Questions

The work done in rotating an electric dipole of dipole moment $p$ in a uniform electric field $E$ from $\theta = 0^\circ$ to $\theta = 180^\circ$ is:

If the temperature of the source in a Carnot engine is increased while the sink temperature remains constant, the efficiency will:

In a stationary wave, the distance between a node and the adjacent antinode is:

The moment of inertia of a uniform thin rod of mass $M$ and length $L$ about an axis passing through its center and perpendicular to its length is:

In a stationary wave, the distance between a node and an adjacent antinode is:

The SI unit of Magnetic Induction is:

If the temperature of a hot reservoir is 600K and the cold reservoir is 300K, the efficiency of the Carnot engine is:

What is the moment of inertia for two specific (solid) spheres about their common diameter?

What is the unit of the \(L/R\) ratio?

What is the formula for the safety speed on a banked road?

What is the SI unit of magnetic induction?

What is the shunt resistance \(S\) needed if the galvanometer current \(I_g\) is \(8\%\) of the total current \(I\)?

If a star \(A\) has radiant power three times that of the Sun and a temperature of \(6000\,K\) while the Sun has temperature \(2000\,K\), what is the ratio of their radii \((R_A : R_{Sun})\)?

In a diode rectifier, the capacitors with large values of $C$ are used in filter circuits in order to

If $5,mA$ current is drawn from the voltage source in the circuit connected with two resistors each of $2.4,k\Omega$ and four ideal diodes, then the source voltage is

If $r$ and $v$ represent, respectively, the orbital radius and orbital velocity of the electron in the Bohr's theory of hydrogen atom, then they are proportional to the orbit number as

If two waves of same wavelength with their intensities in the ratio $25:9$ produce interference, then the ratio of the maximum to minimum intensity is

If a radioactive substance is reduced to $6.25%$ of its initial amount in $256$ days then its half-life period is

If the energy of the incident radiation on a metal is increased by $10%$, the kinetic energy of the emitted photoelectrons increases from $0.5,eV$ to $0.75,eV$, then the work function of the metal is

If the de Broglie wavelengths of deuteron, positron and electron are in the ratio $1:2:3$, then the ratio of their respective momenta is

If an object is placed at a distance of $12,cm$ from a thin lens of power $5D$, then the distance of the image from the lens with proper sign convention is

The shunt resistance to be connected across a galvanometer of resistance $50,\Omega$ to send $\dfrac{1}{1000}^{\text{th}}$ of the main circuit current through the galvanometer is nearly

If a coin at the bottom of a lake appears to be at a depth of $6,m$, then the gauge pressure on the coin in pascal is ($\mu$ of water = $\frac{4}{3}$)

For a given ac supply voltage $60\sin\omega t$, the reactances offered by $L$ and $C$ are found to be $20,\Omega$ each. If the resistance of the resistor is also $20,\Omega$, then the current in the circuit is