At metaphase,chromosomes are attached to the spindle fibres by their

Water in a river $20 \ m$ deep is flowing at a speed of $10 \ ms^{-1}$. The shearing stress between the horizontal layers of water in the river in $Nm^{-2}$ is (Coefficient of viscosity of water $= 10^{-3} \ SI$ units).

Assign $A, B, C, D$ from the given type of reaction.
$HgI_2 \downarrow + 2KI \rightleftharpoons K_2[HgI_4]$

$A$ constant volume gas thermometer shows pressure readings of $50 \, cm$ and $90 \, cm$ of mercury at $0^{\circ} C$ and $100^{\circ} C$ respectively. When the pressure reading is $60 \, cm$ of mercury,the temperature is ......... $^{\circ} C$.

If $y=A \cos n x+B \sin n x$, then $y_2+n^2 y$ is equal to

Which of the following is the strongest oxidizing agent?