AIEEE 2012 PYQ Mock Test

Statement 1: Davisson-Germer experiment established the wave nature of electrons.Statement 2: If electrons have wave nature, they can interfere and show diffraction.

A thin liquid film formed between a U-shaped wire and a light slider supports a weight of $1.5\times 10^{-2}\text{N}$. The length of the slider is $30\text{cm}$ and its weight is negligible. The surface tension of the liquid film is:

A charge $Q$ is uniformly distributed over the surface of non-conducting disc of radius $R$. The disc rotates about an axis perpendicular to its plane and passing through its centre with an angular velocity $\omega$. As a result of this rotation a magnetic field of induction $B$ is obtained at the centre of the disc. If we keep both the amount of charge placed on the disc and its angular velocity to be constant and vary the radius of the disc then the variation of the magnetic induction at the centre of the disc will be represented by:

Truth table for system of four NAND gates as shown in figure (where $A,B$ are inputs to a NAND, its output splits to two NANDs, and their outputs go to a final NAND) is equivalent to:

A radar has a power of $1\text{kW}$ and is operating at a frequency of $10\text{GHz}$. It is located on a mountain top of height $500\text{m}$. The maximum distance upto which it can detect object located on the surface of the earth (Radius of earth $=6.4\times 10^6\text{m}$) is: