Which of the following carbonyl compounds will exhibit enolization?
$(i)$
$(ii)$
$(iii)$
$(iv)$
$(v)$

$A$ wire can be broken by applying a load of $20\,kg$ weight. The force required to break the wire of twice the diameter is ......... $kg\,wt$.

Which type of chromosome is represented by the given figure?

Two blocks of masses $1 ~kg$ and $2 ~kg$ are connected by a metal wire going over a smooth pulley as shown in the figure. The breaking stress of the metal is $2 \times 10^9 ~N/m^2$. What should be the minimum radius of the wire used if it is not to break? Take $g = 10 ~m/s^2$.

$ABC$ is a triangular plate of uniform thickness. The sides are in the ratio $3:4:5$ as shown in the figure. $I_{AB}, I_{BC}, I_{CA}$ are the moments of inertia of the plate about axes $AB, BC$ and $CA$ respectively. Which one of the following relations is correct?

$A$ mass $M \text{ kg}$ is suspended by a weightless string. The horizontal force required to hold the mass at $60^{\circ}$ with the vertical is