Physics Test 185

The work of 146 kJ is performed in order to compress one kilomole of gas adiabatically and in this process the temperature of the gas increases by 

Starting from the origin a body oscillates simple harmonically with a period of 2 s. After what time will its kinetic energy be 75% of the total energy?

The wavelength of two waves are 50 and 51 cm respectively. If the temperature of the room is 20^oC then what will be the number of beats produced per second by these waves, when the speed of sound at  ?

A particle of mass m and charge Qis placed at rest in a uniform electric field E and then released. The kinetic energy attained by the particle after moving a distance y is

Two identical metal plates are given positive charges  respectively. If they are now brought close together to form a parallel plate capacitor with capacitance C, the potential difference between them is

Which of the following R equations is a correct equation for it?

A uniformly charged ring of radius 10 cm rotates at a frequency of 10⁴ rps about its axis. The ratio of energy density of electric field to the energy density of the magnetic field at a point on the axis at distance 20 cm from the centre is . Find the value of a.

A magnetic needle lying parallel to a magnetic field requires W units of work to turn it through 60^o. The torque required to keep the needle in this position will be

Two identical circular loops of metal wire are lying on a table without touching each other. Loop–A carries a current which increases with time. In response, the loop–B