List of top Physics Questions

Work required to shift an artificial satellite from an orbit of radius \(r\) to an orbit of radius \(2r\) is

Three rods made of the same material and having the same cross-section have been joined as shown in figure. Each rod is of same length. The left and right ends are kept at \(0^\circ C\) and \(90^\circ C\) respectively. The temperature of the junction will be center

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A \(5\,\text{kg}\) block pushed by \(100\,\text{N}\) over \(10\,\text{m}\) on a plane. If the coefficient of friction between the block and plane is \(0.2\), then the final kinetic energy of the block is _ _ _ (\(g=10\,\text{m s}^{-2}\)):

A force \(F=4x\) is applied to move an object from \(x=0\) to \(x=2\,m\), then the work done is:

A thin wire of length \(L\) and uniform linear mass density \(\rho\) is bent into a circular loop with centre at \(O\) as shown. The moment of inertia of the loop about the axis \(XX'\) is: center

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A particle is executing simple harmonic motion with time period \(T\) and amplitude \(A\). The distance travelled by the particle in \(\frac{T}{12}\) time starting from rest is:

On imparting an initial velocity \(v_0\), a ball begins to move in horizontal circle of radius \(R\) on horizontal plane. If the coefficient of friction between the ball and plane is \(\mu\), then the time required by ball to come to rest is: center

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Two blocks each of mass \(m\) are connected to a spring of spring constant \(K\). If both are given velocity \(V\) in opposite directions as shown in the figure, then the maximum elongation of the spring is center

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If \(Q\), \(L\) and \(T\) represent the electric charge, inductance and time respectively, then the physical quantity having the dimensions of \( \dfrac{QL}{T^2} \) is:

A body is placed at the top of an inclined plane of angle of inclination \( \tan^{-1}\left(\frac{9}{16}\right) \). If the plane is smooth, the body reaches the bottom in time \(T\) and if the plane is rough, it takes time \(3T\) to reach the bottom of the plane, then the coefficient of kinetic friction between the body and the rough inclined plane is:

A small bead is placed on a thin circular loop of radius \(25\,\text{cm}\) which is rotating about its vertical diameter with a constant velocity of \(10\,\text{rad s}^{-1}\). The angle made by the radius vector joining the center of the loop to the bead with the vertically downward direction is (Neglect friction and take \(g=10\,\text{m s}^{-2}\)):

A body is falling freely under gravity from a height of \(200\,\text{m}\). The total displacement of the body during the second half-second, fourth half-second and sixth half-second of its motion is (Acceleration due to gravity \(=10\,\text{m s}^{-2}\)):

If the minimum velocity of a projectile during its motion is \(40\,\text{m s}^{-1}\) and the ratio of its vertical and horizontal displacements at a time of \(2\,\text{s}\) is \(1:2\), then the angle of projection of the projectile is:

A body is projected with a velocity of \(15\sqrt3\,\text{m s}^{-1}\) at an angle of \(60^\circ\) with the horizontal and another body is projected simultaneously from the same point in the same vertical plane with a velocity of \(40\,\text{m s}^{-1}\) at an angle of \(30^\circ\) with the horizontal. The time at which the velocity vectors of the two bodies will be in the same direction is:

Approximate bandwidth required to transmit music is:

Electron-positron annihilation produces photons. Momentum of each photon is: (m = $9\times10^{-31}$ kg)

An electron in n-region enters p-region with speeds $5\times10^5$ m/s and $3\times10^5$ m/s before and after barrier. Find barrier potential.

Ratio of wavelengths of first and third Lyman spectral lines of hydrogen atom is:

If a thorium nucleus of mass number 232 and atomic number 90 emits six $\alpha$-particles and four $\beta$-particles, then the ratio of number of protons to neutrons in the final nucleus is:

Two OR gates and one AND gate are connected as shown. Find correct truth table output Y.

If magnetic field at equator is 0.4 G, earth's magnetic dipole moment is of order: (R = 6400 km)

A proton and alpha particle enter same magnetic field with same KE at 30° angle. Ratio of pitches is:

The rms electric field of an EM wave is $30\sqrt{\pi}\ \text{V m}^{-1}$. Find its intensity in free space.}

A series RC circuit has R = $\frac{125}{\sqrt{3}}\ \Omega$, C = $\frac{40}{\pi}\ \mu F$, and f = 100 Hz. Find phase difference between current and voltage.}

The magnetic flux linked with a coil varies as $\phi = 2.5t^2 + 5t + 7$ (t in s). If the induced electric power at t = 3 s is 2 W, then the power at t = 5 s is: