List of top Physics Questions

The escape velocity for the earth is $11.2 \,km / sec$. The mass of another planet $100$ times mass of earth and its radius is $4$ times radius of the earth. The escape velocity for the planet is:

Which one is a vector quantity?

Which one proves transverse nature of waves?

Water rises in a vertical capillary tube upto a length of $10 \,cm$. If the tube is inclined at $ 45{}^\circ $ , the length of water column risen in the tube will be

Two identical photo cathodes receive light of frequencies $f_1$ and $f_2$. if the velocities of the photoelectrons (of mass m) coming out are respectively $v_1$ and $v_2$, then

Two coils are placed close to each other. The mutual inductance of the pair of coils depends upon

To demonstrate the phenomenon of interference we require two soruces which emit radiation of

Three charges $-q_1, +q_2$ and $-q_3$ are placed as shown in the figure. The x-component of the force on $-q_1$ is proportional to

The work done in placing a charge of $8 ??10^{-18}$ coulomb on a condenser of capacity 100 micro-farad is

The velocity with which a projectile must be fired so that it escapes earth's gravitation does not depend on

The physical quantities not having same dimensions are

The kinetic energy of an electron is $ 5\,\,eV $ . Calculate the de-Broglie wavelength associated with it ( $ h=6.6\times {{10}^{-34}}\,\,Js $ , $ {{m}_{e}}=9.1\times {{10}^{-31}}kg $ ):

A resonance air column of length $ 40\,\,cm $ resonates with a tuning fork of frequency $ 450\,\,Hz $ . Ignoring end correction, the velocity of sound in air will be:

The work done in pulling up a block of wood weighing $ 2\,\,kN $ for a length of $ 10\,\,m $ on a smooth plane inclined at an angle of $ {{15}^{o}} $ with the horizontal is:

A siren emitting sound of frequency 500 Hz is going away from a stationary listener with a speed of $ 50\,\,m/s $ , the frequency of sound to be heard directly from the siren is:

The peak value of alternating current is $ 5\sqrt{2} $ ampere. The mean square value of current will be:

In junction diode, the holes are because of:

The length of a simple pendulum executing simple harmonic motion is increased by $21\%$. The percentage increase in the time period of the pendulum of increased length is

The image formed by an objective of a compound microscope is

The electrostatic capacitance depends on:

The electric potential between a proton and an electron is r given by $V = V_0 in\frac{r}{r_0}, where r_0$ is a constant. Assuming Bohr's model to be applicable, write variation of rn with n, n being the principal quantum number.

The displacement of a particle varies according to the relation $x = 4(cos\, pt + sin \,pt).$ the amplitude of the particle is

Reverse bias applied to a junction diode

The slope of plate characteristic and mutual characteristic curves of a triode valve is $0.02\, mA / V$ and $1 \,mA / V$. The amplification factor of triode valve is:

In the following common emitter configuration an $n p n$ transistor with current gain $\beta=100$ is used. The output voltage of the amplificr will be