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

Two small spherical metal balls, having equal masses, are made from materials of densities ${\rho }_1$ and ${\rho }_2$ such that ${\rho }_1=8{\rho }_2$ and having radii of $r_1$ and $r_2$, respectively. They are made to fall vertically (from rest) in a viscous medium whose coefficient of viscosity equals $\eta$ and whose density is $0.1{\rho }_2$. The ratio of their terminal velocities would be:

The distance covered by a particle undergoing SHM in one time period is: (amplitude = $A$)

Assuming that the gravitational potential energy of an object at infinity is zero, the change in potential energy (final - initial) of an object of mass $m$ when taken to a height $h$ from the surface of the earth (of radius $R$ and mass $M$), is given by:

A deep rectangular pond of surface area $A$, containing water (density = $\rho$, specific heat capacity = $s$), is located in a region where the outside air temperature is at a steady value of $-26^{\circ }\text{C}$. The thickness of the ice layer in this pond at a certain instant is $x$. Taking the thermal conductivity of ice as $k$, and its specific latent heat of fusion as $L$, the rate of increase of the thickness of the ice layer, at this instant, would be given by:

The variation of EMF with time for four types of generators is shown in the figures. Which amongst them can be called AC voltage?