Physics Test - ...

A coil and a magnet are moved in the same direction and with same speed. What will happen?

Find velocity of block 'B' at the instant shown in figure.

An angular magnification (magnifying power) of 30X is desired using an objective of focal length \(1.25~cm\) and an eyepiece of focal length \(5~cm\). Find object distance for objective lens, object distance for eye piece, and seperation between objective lens and eye piece respectively ?

Electricity and magnetism are mutually:

A tank is filled with water of density \(1 \frac{{~g}}{{cm}^{3}}\) and oil of density \(0.9 \frac{{~g}}{{cm}^{3}}\). The height of water layer is \(100 {~cm}\) and that of oil layer is 400 \({cm}\). If \(g=980 \frac{{~cm}}{{s}^{2}}\), then the velocity of efflux from an opening in the bottom of the tank will be-

As per given figure \(A, B\) and \(C\) are the first, second and third excited energy levels of hydrogen atom respectively. If the ratio of the two wavelengths (. i.e. \(\frac{\lambda_1}{\lambda_2}\) ) is \(\frac{7}{4 n^{\prime}}\), then the value of \(n\) will be ______]

A body is projected vertically upwards from the surface of earth with a velocity sufficient enough to carry it to infinity. The time taken by it to reach height h is ______ S.

Which of the following is known as indirect band gap semiconductors?

A \(100 \mathrm{~W}\) sodium lamp radiates energy uniformly in all directions. The lamp is located at the centre of a large sphere that absorbs all the sodium light which is incident on it. The wavelength of the sodium light is \(589 \mathrm{~nm}\). The number of photons delivered per second to the sphere is: