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

A tuning fork with a frequency of $800\text{Hz}$ produces resonance in a resonance column tube with the upper end open and the lower end closed by the water surface. Successive resonances are observed at lengths of $9.75\text{cm}$, $31.25\text{cm}$, and $52.75\text{cm}$. The speed of the sound in the air is:

A particle starting from rest moves in a circle of radius $r$. It attains a velocity of $v_0\text{m/s}$ on completion of $n$ rounds. Its angular acceleration will be:

$1\text{g}$ of water of volume $1{\text{cm}}^3$ at $100^{\circ }\text{C}$ is converted into steam at the same temperature under normal atmospheric pressure $\approx 1\times 10^5\text{Pa}$. The volume of steam formed equals $1671{\text{cm}}^3$. If the specific latent heat of vaporization of water is $2256\text{J/g}$, the change in internal energy is:

A cycle wheel of radius $0.5\text{m}$ is rotated with a constant angular velocity of $10\text{rad/s}$ in a region of a magnetic field of $0.1\text{T}$ which is perpendicular to the plane of the wheel. The EMF generated between its centre and the rim is:

A person standing on the floor of an elevator drops a coin. The coin reaches the floor in time $t_1$ if the elevator is moving uniformly and time $t_2$ if the elevator is stationary. Then: