NEET 2019 Exam Paper (Odisha) (180 Q) - Mock Test

The rate of radioactive disintegration at an instant for a radioactive sample of half-life $2.2\times 10^9\text{s}$ is $10^{10}{\text{s}}^{-1}$. The number of radioactive atoms in that sample at that instant is:

A solid cylinder of mass $2\text{kg}$ and radius $50\text{cm}$ rolls up an inclined plane of angle of inclination $30^{\circ }$. The centre of mass of the cylinder has a speed of $4\text{m/s}$. The distance travelled by the cylinder on the inclined surface will be ($g=10{\text{m/s}}^2$):

In a U-tube, as shown in the figure, the water and oil are in the left side and right side of the tube respectively. The height of the water and oil columns are $15\text{cm}$ and $20\text{cm}$ respectively. The density of the oil is (${\rho }_{water}=1000{\text{kg/m}}^3$):

An LED is constructed from a p-n junction diode using $\text{GaAsP}$. The energy gap is $1.9\text{eV}$. The wavelength of the light emitted will be equal to:

A biconvex lens has power $P$. It is cut into two symmetrical halves by a plane containing the principal axis. The power of one part will be: