List of top Physics Questions

Four molecules of a gas have speeds $1,2,3$ and $4\, kms ^{-1}$. The value of rms speed of the gas molecules is :
Three vectors satisfy the relation $\overrightarrow{A}.\overrightarrow{B}=0$ and $\overrightarrow{A}.\overrightarrow{C}=0$ then $\overrightarrow{A}$ is parallel to
The time taken by AC of 50 Hz in reacting from zero to the maximum value is
The aperture of objective lens of a telescope is made large so as to
A steel wire $0.5\, m$ long has a total mass $kg$ and stretched with a tension of $800\, N$. The frequency with which it vibrates in its fundamental note will be :
A girl is swinging on a swinging plate form in sitting position when the girl stands up then the period of swinging?
An automobile in travelling at 50 km/h, can be stopped at a distance of 40 m by applying brakes. If the same automobile is travelling at 90 km/h, all other conditions remaining same and assuming no skidding, the minimum stopping distance in metres is:
A man of weight $80\, kg$ is standing in an elevator which is moving with an acceleration of $ 6\,m/{{s}^{2}} $ in upward direction. The apparent weight of the man will be $ (g=10\,\,m/{{s}^{2}}) $ :
The magnetic lines of force inside a bar magnet
Three forces start acting simultaneously on a particle moving with velocity $\vec{v}$ . These forces are represented in magnitude and direction by the three sides of a triangle ABC(as shown). The particle will now move with velocity
The value of amu is which of the following?
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: