List of top Physics Questions

By what percentage should the pressure of a given mass of a gas be increased so as to decrease its volume by 10% at a constant temperature?

Buffer amplifier is used at the transmitting end to

Boyle's law is applicable for an

Both earth and moon are subjected to the gravitational force of the sun. As observed from the sun, the orbit of the moon

Boyle's law is applicable when A) temperature is constant B) gasfis at high temperature and low pressure C) the vessel enclosing the gas is good conductor D) the process is isothermal

Blowing air with open mouth is an example of

Bob $A$ of a simple pendulum is released w hen the string makes an angle of $45^\circ$ with vertical. It hits another $bob\, B$ of same material and same mass kept at rest on table. If the collision is elastic

Block $A$ of weight $100\, N$ rests on a frictionless inclined plane of slope angle $30^?$ as shown in the figure. A flexible cord attached to $A$ passes over a frictionless pulley and is connected to block $B$ of weight $W$. Find the weight $W$ for which the system is in equilibrium.

Bernoulli's theorem is applicable in the case of

Bells are made of metal and not of wood because

Beat phenomenon is physically meaningful only, if

Beats are produced by the superposition of two waves of nearly equal frequencies. Of the following, the correct statement is

Beats are the result of

barometer reads 75 cm of mercury. When $2.0 \,cm^3$ of air at atmospheric pressure is introduced into the space above the mercury level, the volume of this space becomes $50 \,cm^3$. The length by which the mercury column descends is

Band spectrum is produced by

Average acceleration vector for a particle having uniform circular motion is

Atomic mass number of an element is 232 and its atomic number is 90. The end products of this radioactive element is an isotope of lead (Atomic mass 208 and atomic number 82). The number of $\alpha\,and\,\beta$-particle emitted is

Atomic weight of Boron is 10.81 and it has two isotopes $_5B^{10}$ and $ _5B^{11}$ Then the ratio of $_5B^{10} :_5B^{11}$ in nature would be

At what temperature is the rms velocity of hydrogen molecule equal to that of an oxygen molecule at $47\,^{\circ}C$?

At zero degree kelvin a piece of Germanium

At what temperature will the speed of sound in air be $3$ times its value at $0\,^?C$?

At what temperature, hydrogen molecules will escape from the earth's surface? (Take mass of hydrogen molecule $=0.34\times10^{-26} kg,$ Boltzmann constant $-1.38\times10^{-23} J K^{-1},$ Radius of earth $=6.4\times10^{6} m$ and acceleration due to gravity $=9.8 ms^{-2}$ )

At what height above the surface of earth the value of acceleration due to gravity would be half of its value on the surface of earth? (Radius of the earth is 6400 km)

At the maximum height of a projectile, the velocity and acceleration are

At the maximum height of a body thrown vertically up