NEET 2016 Question Paper - Phase-I Code B Q X - Mock Test

A black body is at a temperature of $5760\text{K}$. The energy of radiation emitted by the body at wavelength $250\text{nm}$ is $U_1$, at wavelength $500\text{nm}$ is $U_2$ and that at $1000\text{nm}$ is $U_3$. Wien’s constant, $b=2.88\times 10^6\text{nm K}$. Which of the following is correct?

An air column, closed at one end and open at the other, resonates with a tuning fork when the smallest length of the column is $50\text{cm}$. The next larger length of the column resonating with the same tuning fork is:

The molecules of a given mass of a gas have r.m.s velocity of $200{\text{ms}}^{-1}$ at $27^{\circ }\text{C}$ and $1.0\times 10^5{\text{Nm}}^{-2}$ pressure. When the temperature and pressure of the gas are respectively $127^{\circ }\text{C}$ and $0.05\times 10^5{\text{Nm}}^{-2}$, the r.m.s. velocity of its molecules in ${\text{ms}}^{-1}$ is:

Consider the junction diode as ideal. The value of current flowing through $AB$ is:

If the magnitude of sum of two vectors is equal to the magnitude of difference of the two vectors, the angle between these vectors is: