List of top Physics Questions

Two mercury drops (each of radius \( r \)) merge to form a bigger drop. The surface energy of the bigger drop is, if \( T \) is the surface tension, is
The value of \( \tan(90^\circ - \theta) \) in the graph gives
A hollow insulated conduction sphere is given a positive charge of 10 μC. What will be the electric field at the centre of the sphere if its radius is 2 meters?
An alternating voltage of 220 V, 50 Hz frequency is applied across a capacitor of capacitance 2 μF. The impedance of the circuit is
A current carrying coil is subjected to a uniform magnetic field. The coil will orient so that its plane becomes
The current in a coil of \( L = 40 \, \text{mH} \) is to be increased uniformly from 1 A to 11 A in 4 milli sec. The induced e.m.f. will be
A vessel of depth 2d cm is half-filled with a liquid of refractive index \( \mu_1 \) and the upper half with a liquid of refractive index \( \mu_2 \). The apparent depth of the vessel seen perpendicularly is
Two capacitors \( C_1 \) and \( C_2 \) in a circuit are joined as shown in the figure. The potentials of points A and B are \( V_1 \) and \( V_2 \), respectively. Then the potential of point D will be
A smooth sphere of mass \( M \) moving with velocity \( u \) directly collides elastically with another sphere of mass \( m \) at rest. After collision, their final velocities are \( V \) and \( v \) respectively. The value of \( v \) is
Kerosene oil rises up in a wick of a lantern because of
Light of wavelength 500 nm is incident on a metal with work function \( 2.28 \, \text{eV} \). The de Broglie wavelength of the emitted electron is:
A conducting circular loop of radius \( r \) carries a constant current \( i \). It is placed in a uniform magnetic field \( \vec{B} \) such that \( \vec{B} \) is perpendicular to the plane of the loop. The magnetic force acting on the loop is
Two bodies A and B having masses in the ratio of 3 : 1 possess the same kinetic energy. The ratio of linear momentum of B to A is
Six identical conducting rods are joined as shown in the figure. Points A and D are maintained at 200\(^\circ C\) and 20\(^\circ C\) respectively. The temperature of junction B will be
In which sequence the radioactive radiations are emitted in the following nuclear reaction? \[ Z^{X}A \rightarrow Z+1Y^{A} \rightarrow Z-1K^{A-4} \]
If the kinetic energy of a moving particle is \( E \), then the de-Broglie wavelength is
A hydrogen atom is in ground state. Then to get six lines in emission spectrum, wavelength of incident radiation should be
Which of the following does not support the wave nature of light?
The power dissipated in the circuit shown in the figure is 30 Watts. The value of \( R \) is
A 5000 kg rocket is set for vertical firing. The exhaust speed is 800 m/s. To give an initial upward acceleration of 20 m/s\(^2\), the amount of gas ejected per second to supply the needed thrust will be (Take \(g = 10 \, \text{m/s}^2\))
A cylinder rolls up an inclined plane, reaches some height and then rolls down (without slipping throughout these motions). The directions of the frictional force acting on the cylinder are
A solid cylinder is attached to a horizontal massless spring as shown in figure. If the cylinder rolls without slipping, the time period of oscillation of the cylinder is
A solid cylinder is attached to a horizontal massless spring as shown in figure
The displacement of a particle along the x-axis is given by \(x=a sin^2ω\). The motion of the particle corresponds to
What will be the displacement equation of the simple harmonic motion obtained by combining the motions? Given: \[ x_1 = 2 \sin(\omega t), \quad x_2 = 4 \sin(\omega t + \frac{\pi}{2}), \quad x_3 = 6 \sin(\omega t) \]
Two soap bubble coalesce. It is noticed that, whilst joined together, the radii of the two bubbles are a and b where a>b. Then the radius of curvature of interface between the two bubbles will be