AIEEE 2006 Mock Test

The flux linked with a coil at any instant $t$ is given by $\varphi =10t^2-50t+250$. The induced emf at $t=3\text{s}$ is:

A thermocouple is made from two metals, Antimony and Bismuth. If one junction of the couple is kept hot and the other is kept cold, then an electric current will:

The time taken by a photoelectron to come out after the photon strikes is approximately:

An alpha nucleus of energy $\frac{1}{2}m{v}^2$ bombards a heavy nuclear target of charge $Ze$. Then the distance of closest approach for the alpha nucleus will be proportional to:

The threshold frequency for a metallic surface corresponds to an energy of $6.2\text{eV}$, and the stopping potential for a radiation incident on this surface is $5\text{V}$. The incident radiation lies in the: