List of top Physics Questions

Water rises to a height of \(15\,\text{mm}\) in a capillary tube having cross-sectional area \(A\). If the cross-sectional area of the tube is made \( \dfrac{A}{3} \), then the water will rise to a height
A closed organ pipe and an open organ pipe have their first overtones identical in frequency. Their lengths are in the ratio
A mass \(M\) attached to a horizontal spring executes S.H.M. of amplitude \(A_1\). When the mass passes through its mean position, a smaller mass \(m\) is placed over it and both move together with amplitude \(A_2\). The ratio \( \left(\dfrac{A_1}{A_2}\right) \) is
Inside a bar magnet, the magnetic lines of force
Threshold frequency for a metal is \(15 \times 10^{14}\,\text{Hz}\). The light of wavelength \(6000\,\text{\AA}\) falls on the metal surface. Which one of the following statements is correct?
(Velocity of light, \(c = 3 \times 10^8\,\text{m/s}\))
In Melde’s experiment, when the tension decreases by \(0.009\,\text{kg-wt}\), the number of loops changes from 4 to 5. The initial tension is
Two identical progressive waves moving in opposite directions superimpose to produce a stationary wave. The wavelength of each progressive wave is \( \lambda \). The wavelength of the stationary wave is
In a system of two particles of masses \(m_1\) and \(m_2\), the second particle is moved by a distance \(d\) towards the centre of mass. To keep the centre of mass unchanged, the first particle will have to be moved by a distance
Magnetization of the sample is
Water flows through a horizontal pipe at a speed \(V\). Internal diameter of the pipe is \(d\). If the water is emerging at a speed \(V_1\), then the diameter of the nozzle is
Water rises upto a height \(h\) in a capillary tube on the surface of the earth. The value of \(h\) increases, if the capillary tube apparatus is kept
With what velocity should an observer move relative to a stationary source so that a sound of double the frequency of source is heard by an observer?
A signal of frequency \(3\,\text{kHz}\) is amplitude modulated on a carrier wave of frequency \(2.5\,\text{MHz}\). The upper and lower sideband frequencies in the resultant signal are
A biconvex lens (\(R_1 = R_2 = 20\,\text{cm}\)) has focal length equal to the focal length of a concave mirror. The radius of curvature of the concave mirror is (\(\mu\) of glass lens = 1.5)
From a uniform circular thin disc of mass \(9M\) and radius \(R\), a small disc of radius \(\frac{R}{3}\) is removed. The centre of the small disc is at a distance \(\frac{2R}{3}\) from the centre of the original disc. The moment of inertia of the remaining disc about an axis perpendicular to the plane of the disc and passing through the centre of the original disc is
Earth revolves round the sun in a circular orbit of radius \(R\). The angular momentum of the revolving earth is directly proportional to
If \(N\) is the number of turns in a circular coil, the value of its self-inductance varies as
At what temperature is the R.M.S. velocity of a hydrogen molecule equal to that of an oxygen molecule at \(47^\circ\text{C}\)? (Molecular weight of hydrogen = 2, molecular weight of oxygen = 32)
A body of mass \(M\) moving with velocity \(V\) explodes into two equal parts. If one part comes to rest and the other part moves with velocity \(V_0\), what would be the value of \(V_0\)?
In the following network, \(I_1=-0.4\,\text{A}\), \(I_4=1\,\text{A}\) and \(I_5=0.4\,\text{A}\). The values of \(I_2\), \(I_3\) and \(I_6\) respectively are
A circular coil of radius \(R\) carries an electric current \(I\). The magnetic field due to the coil at a point on the axis of the coil located at a distance \(r\) from the centre of the coil, such that \(r \gg R\), the magnetic field at that point is proportional to
If \(E\), \(M\), \(L\) and \(G\) denote energy, mass, angular momentum and constant of gravitation respectively, then the quantity \( \left(\dfrac{EL^2}{G^2M^5}\right) \) has dimensions of
When an electron in a hydrogen atom jumps from the third orbit to the second orbit, it emits a photon of wavelength \( \lambda \). When it jumps from the fourth orbit to the third orbit, the wavelength emitted by the photon will be
In Young’s double slit experiment, the 6th maximum with wavelength \( \lambda_1 \) is at a distance \( d_1 \) from the central maximum and the 4th maximum with wavelength \( \lambda_2 \) is at distance \( d_2 \). Then \( \dfrac{d_1}{d_2} \) is
An electron accelerated through potential difference \(V\) passes through a uniform transverse magnetic field and experiences a force \(F\). If the accelerating potential is increased to \(2V\), the electron in the same magnetic field will experience a force