Physics Test - ...

A metal plate of area \(10^{3} \mathrm{~cm}^{2}\)rests on a layer of oil \(6\) mm thick. A tangential force of \(10^{2} \mathrm{~N}\)is applied on it to move it with a constant velocity of \(6 \mathrm{~cm} \mathrm{~s}^{1}\). The coefficient of viscosity of the liquid is

The missing particle in the reaction:

\({ }_{99}^{253} \mathrm{Es}+{ }_{2}^{4} \mathrm{He} \rightarrow{ }_{101}^{256} \mathrm{Md}+\)

What is the density of lead under a pressure of \(2.0 \times 10^{8} \mathrm{~N} / \mathrm{m}^{2}\), if the bulk modulus of lead is \(8.0 \times 10^{9} \mathrm{~N} / \mathrm{m}^{2}\). Also, the initial density of lead is \(11.4 \mathrm{~g} / \mathrm{cm}^{3}\).

A piece of metal floats on mercury. The coefficients of volume expansion of the metal and mercury are \(\gamma_{1}\) and \(\gamma_{2}\) respectively. If the temperature of both mercury and metal are increased by an amount \(\Delta t\), the fraction of the volume of the metal submerged in mercury changes by the factor.

During the melting of solid, its temperature ________.

Among the following reactions, the impossible one is :

When the tension in a metal wire is \(T_{1}\), its length is \({l}_{{t}}\). When the tension is \({T}_{2}\), its length is \(l_{2}\). The natural length of wire is:

At t = 0, an arrow is fired vertically upwards with a speed of 98 ms-1. A second arrow is fired vertically upwards with the same speed at t = 5 s. Then,

The work function of Cesium is 2.27eV. The cut-off voltage which stops the emission of electrons from a cesium cathode irradiated with light of 600nm wavelength is: