List of top Physics Questions

A simple harmonic progressive wave is represented by \(y = Asin(120πt+3x)\). The distance between two points on the wave at a phase difference of \(\frac{π}{3}\) radian is
A pipe open at both ends has a fundamental frequency 'f' in air. The pipe is dipped in water, so that \(\frac{2}{3}^{rd}\) length of pipe is in water, Now the fundamental frequency of the air column is
A black rectangular surface of area A emits energy E per second at \(127^{\circ}\)C. If length and breadth is reduced to half of initial value and temperature is raised to \(527^{\circ}\)C then energy emitted becomes
An ideal gas is expanded adiabatically. How many times has the gas to be expanded to reduce the r.m.s. speed of molecules 3 times ? (\(γ = 1.5\))
The ratio of the thermal conductivity of two rods of different materials is 6:5. The two rods of same area of cross section and same thermal resistance will have the length in the ratio
The average translational kinetic energy of a molecule in a gas is \(E_1\). The kinetic energy of the electron (e) accelerated from rest through potential difference 'V' volt is \(E_2\). The temperature at which \(E_1 = E_2\) possible is (N = number of molecules, R = gas constant)
The energy spectrum of a black body exhibits a maximum around a wavelength \(λ\). The temperature of a black body is now changed such that the energy is maximum at wavelength \(2λ/3\). The power radiated by the black body will now increase by a factor of
In a cyclic process, work done by the system is
A bucket containing water is revolved in vertical circle of radius r. To prevent the water from falling down, the period of revolution required is (\(g\) = gravitational acceleration)
Three liquids have same surface tension and densities \(ρ_1\), \(ρ_2\) and \(ρ_3\) (\(ρ_1 < ρ_2 < ρ_3\)). In three identical capillaries rise of liquid is same. The corresponding angle of contact \(θ_1\), \(θ_2\) and \(θ_3\) are related as
The distance of the two planets A and B from the sun are '\(r_A\)' and '\(r_B\)' respectively such that \(r_B = 100\,r_A\). The ratio of the speed of planet A to that of planet B is (both the planets are revolving around the sun)
The excess pressure inside the first soap bubble of radius \(R_1\) is three times that inside the second soap bubble of radius \(R_2\). The ratio of volumes of the first to second bubble is
A square frame of each side L is dipped in a soap solution and taken out, the force acting on the film formed is ( T = surface tension of soap solution)
In case of perfectly elastic collision,
A car of mass m is crossing the convex bridge of radius of curvature R with speed V. At the highest point the thrust is (\(g\) = gravitational acceleration)
A batsman hits a ball with a velocity 'v', making an angle of \(60^{\circ}\) with the vertical. After some time direction of velocity is making an angle of \(60^{\circ}\) with the horizontal. The speed of the ball at this instant is
\([cos(60^{\circ}) = \frac{1}{2},cos(30^{\circ}) = \frac{\sqrt{3}}{2}]\)
Let \(\overset{⃗}{A}\) and \(\overset{⃗}{B}\) are two non-zero vectors of different magnitude. Which one of the following is the correct equation ?
A wire has mass \((0.3\pm 0.003)\) gram, radius \((0.5\pm 0.005)\) mm and length \((6\pm 0.06)\) cm. The maximum error in the measurement of density is
A particle at rest starts moving with constant angular acceleration '\(α\)' in a circular path of radius 'r'. At certain instant, the magnitude of centripetal acceleration is \((\frac{1}{3})^{rd}\) the tangential acceleration. The relation between linear speed (V) and angular acceleration (\(α\)) is
Four capacitors are connected to a battery as shown in figure. The ratio of charges on capacitors \(C_2\) and \(C_4\) is
Which of the following graph represents the temperature (T) dependence of resistivity (\(ρ\)) of a semiconductor?
Which one of the four graphs showing lines P, Q, R and S between maximum kinetic energy (E) and intensity of incident radiation (I) is correct?
The current flowing through the inductor of self inductance 'L' is continuously increasing at constant rate. The variation of induced e.m.f. (e) versus \(\frac{dI}{dt}\) is shown graphically by figure
For hydrogen atom, \(λ_1\) and \(λ_2\) are the wavelengths corresponding to the transitions \(1\) and \(2\) respectively as shown in figure. The ratio of \(λ_1\) and \(λ_2\) is \(x/32\). The value of \(x\) is
In Young's double slit experiment, following figure shows that \(Q\) is the position of second bright fringe on the right side of point \(O\). \(P\) is the eleventh bright fringe on the other side measured from point \(Q\). If the wavelength of light used is \(6000\) Å, then what will be the value of \(S_1B\)?