List of top Physics Questions

Two monoatomic ideal gases '1' and '2' of molecular masses \(m_1\) and \(m_2\) respectively are enclosed in separate containers kept at the same temperature. The ratio of the speed of sound in gas '1' to that in gas '2' is

Two sound waves each of wavelength \(λ\) and same amplitude \(A\) interfere at point \(Q\). If the path difference is \(\frac{λ}{4}\), the amplitude of the resultant wave at point \(Q\) is \([sin\frac{π}{2} = 1,cos\frac{π}{2} = 0]\)

If charge \(+q\) is taken from one point to another over an equipotential surface, then

Two waves are represented as
\(y_1 = a_1sin(ωt-\frac{2πx}{λ})\) and
\(y_2 = a_2cos(ωt-\frac{2πx}{λ}+\frac{π}{6})\)
The path difference between two waves is

The equation of a wave on a string of linear mass density \(0.02 \text{kg m}^{-1}\) is \(Y = 0.01sin[2π(\frac{t}{0.02}-\frac{x}{0.50})]\) m. The tension in the string is

A particle is performing S.H.M. about \(x = 0\), with an amplitude \(a\) and time period \(T\). The speed of the particle at \(x = \frac{a}{3}\) will be

For a particle executing S.H.M., the potential energy is \(n\) times the kinetic energy when its displacement from mean position is \((\frac{2\sqrt{2}}{3})A\), where \(A\) is the amplitude of S.H.M. The value of \(n\) is

The displacement of a particle varies with time according to the relation
\(x = asinωt+bcosωt\)

An ideal gas having pressure \(P\), volume \(V\) and temperature \(T\) is expanded isothermally, to a volume \(3V\) and final pressure \(P_I\). The same gas is expanded adiabatically to a volume \(3V\), the final pressure being \(P_A\). The ratio \(\frac{P_A}{P_I}\) is \((\frac{C_P}{C_V} = γ)\)

The efficiency of Carnot engine which operates between the two temperatures \(T_1 = 500\) K and \(T_2 = 300\) K is

A piece of metal of 850 K is dropped into 1 kg of water at 300 K. If equilibrium temperature of water is 350 K then the heat capacity of the metal expressed in \(\frac{J}{K}\) is \((\text{Sp. heat of water} = 1 \frac{\text{cal}}{\text{g}^{\circ}\text{C}})\)

A sphere having temperature 600 K is losing heat due to radiation. At this temperature its rate of cooling is \(R\). The rate of cooling of this sphere at 400 K is \(\frac{x}{243}\). The value of \(x\) is (Temperature of surrounding is 300 K)

A black body is at temperature of 5780 K. The energy of radiation emitted by the body at wavelength 300 nm is \(U_1\), at wavelength 500 nm is \(U_2\) and that at 900 nm is \(U_3\) respectively. Wien's constant \(b = 2.89\times 10^6 \text{nmK}\). This shows that

A small metal sphere is falling through a viscous liquid. The variation of velocity (\(V\)) with time (\(t\)) is shown correctly in graph

If we dip capillary tubes of different radii \(r_n\) in water and the water rises to different heights \(h_n\) in them, then (\(n = 1,2,3\) .........)

A solid sphere of mass 5 kg and a disc of mass 4 kg have the same radius. The ratio of moment of inertia of the sphere about its tangent to the moment of inertia of the disc about a tangent in its plane will be \(x:y\). The value of \(x\) and \(y\) respectively is

On opposite sides of a wide vertical vessel filled with water (density \(ρ\)), two identical holes are drilled, each having cross-section area \(A\). The height difference between holes is \(x\). The resultant force of reaction of water flowing out of vessel is (\(g\) = acceleration due to gravity)

Two stars A and B radiate maximum energy at wavelength \(3.9\times 10^{-7}\) m and \(5.2\times 10^{-7}\) m respectively. The ratio of the temperature of star A to that of star B will be

Select the correct statement out of the following

Two spheres are projected at angles \(30^{\circ}\) and \(45^{\circ}\) with the horizontal. The maximum height reached by both is same. The ratio of their initial velocities is, \((sin45^{\circ} = \frac{1}{\sqrt{2}},sin30^{\circ} = 0.5)\)

A particle completes 2 revolutions in a circular path of radius 3 cm. The angular displacement of the particle will be (in radian)

Three blocks of different masses connected with inextensible string are pulled by a force \(F\) on a frictionless surface as shown in the figure. The ratio of tensions \(T_1\) to \(T_2\) is

A car is travelling at 40 m/s on a circular path of radius 40 m. It is increasing its speed at the rate of \(2 \text{m/s}^2\). Its net acceleration is (in \(\text{m/s}^2\)) nearly

If two vectors \(\overset{⃗}{A} = 4\hat{i}+n\hat{j}+2\hat{k}\) and \(\overset{⃗}{B} = 2\hat{i}+2\hat{j}-\hat{k}\) are mutually perpendicular to each other then value of 'n' is

A physical quantity \(x\) is related as \(x = \sqrt{a} b^2c^3d^{-4}\). Relative errors in the quantities \(a\), \(b\), \(c\) and \(d\) are 2%, 1%, 3% and 4% respectively. Relative error in \(x\) will be