List of top Physics Questions

A small sphere oscillates simple harmonically in a watch glass whose radius of curvature is \(1.6\) m. The period of Oscillation of the sphere is (Acceleration due to gravity \(g = 10\text{ m/s}^2\))

A Pipe open at one end has length \(0.8\) m. At the open end of the tube a string \(0.5\) m long is vibrating in its first overtone and resonates with fundamental frequency of pipe. If tension in the string is \(50\) N, the mass of string is (Neglect end correction) (Speed of sound \(= 320\) m/s)

The number of lines of force originating from a point charge of \(2\times 8.85\times 10^{-9}\) C in a medium of dielectric constant \(10\) is (\(ε_0 = 8.85\times 10^{-12}\) SI unit)

The fundamental frequency of sonometer wire is \(50\) Hz for some length and tension. If the length is increased by \(25\%\) by keeping the tension same, then the frequency change of second harmonic is

A sonometer wire resonates with \(4\) antinodes between the two bridges for a given tuning fork when \(1\) kg mass is suspended from the wire. Using same fork, when mass M is suspended, the wire resonates producing \(2\) antinodes between the two bridges. (Distance between the bridges as before) The value of M is

A wire is under tension of \(2\) kg wt and a wave is travelling through it with some speed. Tension in the wire is so increased that the wave travels through it with thrice the original speed. The increase in tension is (in kg wt)

A monoatomic gas is stored in a thermally insulated container and the gas is suddenly compressed to \((\frac{1}{8})^{th}\) of its initial volume. The ratio of final pressure to initial pressure is

A particle starts from mean position and performs S.H.M. with period \(6\) second. At what time its kinetic energy is \(50\%\) of total energy? (\(cos45^{\circ} = 1/\sqrt{2}\))

The average force applied on the walls of a closed container depends on temperature (T) as (T is the temperature of an ideal gas)

In thermodynamic isobaric process

About black body radiation, which one of the following is a WRONG statement?

A particle executes linear S.H.M. with amplitude \(4\) cm. The magnitude of velocity and acceleration is equal when it is at \(3\) cm from mean position. Time period is

A black disc has a radius 'R' and wavelength corresponding to the maximum intensity is '\(λ\)'. The emissive power (E) for the different radii and maximum wavelengths is directly proportional to

What should be the angular velocity of earth due to rotation about its own axis so that the weight at equator becomes \((\frac{3}{5})^{th}\) of initial value? (\(g =\) acceleration due to gravity, R = radius of earth)

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 bubble to second bubble is

Water rises to a height \(3\) cm in a capillary tube. If cross-sectional area of capillary tube is reduced to \(1/3^{rd}\) of its initial area then water will rise to a height of

An ordinary body cools from \(4θ\) to \(3θ\) in 't' minutes. The temperature of the body after next 't' minutes is (Assume Newton's law of cooling and room temperature as \(θ\))

A soap bubble of radius R is blown. After heating the solution, a second bubble of radius 2R is blown. The work required to blow the second bubble in comparison to that required for the first bubble is

The power (P) is supplied to rotating body having moment of inertia 'I' and angular acceleration '\(α\)'. Its instantaneous angular velocity is

A vector \(\overset{⃗}{A}\) when added to the sum of the vectors \((\hat{i}-2\hat{j}+2\hat{k})\) and \((-2\hat{i}+\hat{j}-\hat{k})\) gives a unit vector along Y axis. The magnitude of vector \(\overset{⃗}{A}\) is

A stone falls from the top of a tower of height \(100\) m and at the same time another stone is projected vertically upwards from the ground with a velocity \(25\) m/s. The two stones meet after

If the earth suddenly contracts to \((\frac{1}{3})^{rd}\) of its present size without change in its mass, the ratio kinetic energy of the earth after and before contraction will be (Earth is assumed to be a rotating sphere about itself)

Two masses \(m_1\) and \(m_2\) moving with velocities \(V_1\) and \(V_2\) in opposite directions collide elastically and after collision \(m_1\) and \(m_2\) move with velocities \(V_2\) and \(V_1\) respectively. The ratio \(\frac{m_2}{m_1}\) is

A particle performing U.C.M. of radius \(\frac{π}{2}\) m makes 'x' revolutions in time t. Its tangential velocity is

The length of rod is measured by meter scale having least count \(0.1\) cm and diameter is measured by vernier callipers having least count \(0.01\) cm. Length of rod is \(5.0\) cm and radius \(2.0\) cm. The percentage error in the calculated value of the volume is