List of top Physics Questions

Two trains are moving towards each other with speeds of 20 m/s and 15 m/s relative to the ground. The first train sounds a whistle of frequency 600 Hz, the frequency of the whistle heard by a passenger in the second train before the train meeets is (the speed of sound in air is 340 m/s)
Power supplied to a particle of mass 2 kg varies with time as $ P=\frac{3{{t}^{2}}}{2}W. $ Here t is in second. If velocity of particle at $ t=0 $ is $ v=0, $ the velocity of particle at time $ t=2\,s $ will be
A pulley fixed to the ceiling carries a string with blocks of masses $m$ and $3m$ attached to its ends. The masses of string and pulley are negligible. When the system is released, the acceleration of centre of mass will be
The charge flowing in a conductor varies with time as $ Q=at-b{{t}^{2}}, $ then the current changes at the rate of $ (-2b) $ falls to zero after $ T=\left( \frac{a}{2b} \right) $ (3) reaches a maximum and then decreases (4) will remain constant
A wooden block of mass $M$ resting on a rough horizontal surface is pulled with a force $F$ at an angle with the horizontal. If $ \mu $ is the coefficient of kinetic friction between the block and the surface, then acceleration of the block is
The work done by an applied variable force $F=x +x^{3}$ from $x=o m$ to $x=2, m$ where $x$ is displacement, is
In a stationary wave all the particies
The reduced mass of two particles having masses $m$ and $2\, m$ is
The mean free path of collision of gas molecules varies with its diameter $(d)$ of the molecules as
When an $AC$ voltage is applied to a $L-C-R$ circuit, which of following is true ?
A body of mass $M$ starts sliding down on the inclined plane where the critical angle is $\angle ACB = 30^{\circ}$ as shown in figure. The coefficient of kinetic friction will be
Which of the following graphs shows the variation of acceleration due to gravity $g$ with depth $h$ from the surface of the earth?
The work done by an applied variable force $F=x +x^{3}$ from $x=o m$ to $x=2, m$ where $x$ is displacement, is
The centre of mass of a solid cone along the line from the centre of the base to the vertex is at
In a reverse-biased $p-n$ function, When the applied bias voltage is equal to the breakdown voltage, then
The reduced mass of two particles having masses $m$ and $2\, m$ is
The longitudinal wave can be observed in
Which of the following principles is being used in Sonar Technology?
When an $AC$ voltage is applied to a $L-C-R$ circuit, which of following is true ?
A body of mass $M$ starts sliding down on the inclined plane where the critical angle is $\angle ACB = 30^{\circ}$ as shown in figure. The coefficient of kinetic friction will be
In optical fibres, the refractive index of the core is
The mean free path of collision of gas molecules varies with its diameter $(d)$ of the molecules as
Angle between wave velocity and particle velocity of a longitudinal wave is
An observer moves towards a stationary source of sound with a velocity that is one-fifth the velocity of sound. The apparent change in frequency is
Which of the following truth tables corresponds to $ NAND $ gate.