NEET 2017 Question Paper - Code B - Mock Test

Radioactive material 'A' has decay constant '$8\lambda$ ' and material 'B' has decay constant '$\lambda$ '. Initially they have same number of nuclei. After what time, the ratio of number of nuclei of material 'B' to that 'A' will be $e$?

Two NOT gates are connected to the inputs of a NOR gate. The given electrical network is equivalent to:

The resistance of a wire is ‘$R$ ’ ohm. If it is melted and stretched to ‘$n$ ’ times its original length, its new resistance will be:

Two cars moving in opposite directions approach each other with speed of $22\text{m/s}$ and $16.5\text{m/s}$ respectively. The driver of the first car blows a horn having a frequency $400\text{Hz}$. The frequency heard by the driver of the second car is: (velocity of sound $340\text{m/s}$)

In an electromagnetic wave in free space the root mean square value of the electric field is $E_{\text{rms}}=6\text{V/m}$. The peak value of the magnetic field is: