NEET 2017 Question Paper - Code B - Mock Test

One end of a string of length $l$ is connected to a particle of mass ‘$m$ ’ and the other end is connected to a small peg on a smooth horizontal table. If the particle moves in a circle with speed ‘$v$ ’, the net force on the particle (directed towards center) will be: ($T$ represents the tension in the string)

The two nearest harmonics of a tube closed at one end and open at the other end are $220\text{Hz}$ and $260\text{Hz}$. What is the fundamental frequency of the system?

The photoelectric threshold wavelength of silver is $3250\times 10^{-10}\text{m}$. The velocity of the electron ejected from a silver surface by ultraviolet light of wavelength $2536\times 10^{-10}\text{m}$ is nearly: (Given $h=4.14\times 10^{-15}\text{eVs}$ and $c=3\times 10^8{\text{ms}}^{-1}$)

A circuit contains three identical resistors with $R=9.0\Omega$, two identical inductors with $L=2.0\text{mH}$, and an ideal battery with $\epsilon =18\text{V}$. The current '$i$ ' through the battery just after the switch is closed is:

A spherical black body with a radius of $12\text{cm}$ radiates $450\text{W}$ power at $500\text{K}$. If the radius were halved and the temperature doubled, the power radiated in watt would be: