Physics Test - ...

Pure silicon at \(300 \mathrm{~K}\) has equal electron \(\left(\mathrm{n}_{e}\right)\) and hole \(\left(\mathrm{n}_{h}\right)\) concentration of \(1.5 \times 10^{16} m^{-3}\). Doping by indium increases \(n_{h}\) to \(4.5 \times 10^{22} m^{-3}\). The \(n_{e}\) in the doped silicon is:

A book of mass 10 kg is lying at the front desk of a classroom. coefficient of static friction is 0.5. A force of 40 N is applied to the book. The book will:

In an isobaric expansion of a gas:

The energy stored in a \(50 ~{mH}\) inductor carrying a current of \(4 {~A}\) will be:

Which of the following group has the correct units of fundamental quantities as per the SI system?

A diffraction pattern is obtained using a beam of red light. What happens, if the red light is replaced by blue light?

The electric field due to a uniformly charged non-conducting sphere of radius \(R\) as a function of the distance from its centre, is represented graphically by

A pendulum oscillates 45 times in 5 seconds, its frequency will be:

In the circuit shown below, the ammeter reading is zero. Then, the value of the resistance R is:

A proton and \(\alpha\)-particle are accelerated through the same potential difference. The ratio of their de-Broglie wavelength will be: