A boy in a barber's shop sits between two parallel mirrors. The number of images observed by him will be

Calculate the inductance of a coil of resistance \(30\Omega\) connected to a 100V a.c source if the coil draws an r.m.s current of 2A

Which of the following statements is Not true about atoms?

Boiling occurs when the vapour pressure of a liquid is

An electron in a hydrogen atom makes a transition from the ground level to the third level. If the energy at the ground level. calculate the energy at the th...

From the diagram above, the measuring accuracy of the micrometer screw gauge is

The frequency of beats produced when two tunning forks of frequencies 258Hz and 270Hz are sounded close to each other

If the magnification of a virtual image formed by an object 10cm from a convex less is 3, then the focal length of the lens is

In the diagram above, the direction of the force between N and S in the magnetic field is