The acceptable level of carbon monoxide gas $(CO)$ in the atmosphere in $ppm$ level is

$A$ solid cube having certain fixed melting and boiling points takes heat from some source. The variation of temperature $\theta$ of the cube with the heat supplied $Q$ is shown in the adjoining graph. The portion $BC$ of the graph represents the conversion of

$A$ family of curves has the differential equation $x y \frac{d y}{d x}=2 y^2-x^2$. Then,the family of curves is

Which of the following is $NOT$ a mode of nutrition?

Which of the following statements regarding cyanobacteria is incorrect?

The equations of motion of a projectile are given by $x = 36 t$ metre and $2 y = 96 t - 9.8 t^2$ metre. The angle of projection is: