Which of the following are photosynthetic bacteria?

The velocities of three particles of masses $20 \ g$,$30 \ g$ and $50 \ g$ are $10 \hat{i}$,$10 \hat{j}$ and $10 \hat{k}$,respectively. The velocity of the centre of mass of the three particles is

The point of intersection of the pair of lines represented by $x^2+xy+2y^2-3x+2y+4=0$ is

Which of the following processes can be used to obtain heavy water $(D_2O)$?

Which of the following quantities does not depend upon the orbital radius of the satellite?

If $A = \begin{bmatrix} -8 & 5 \\ 2 & 4 \end{bmatrix}$ satisfies the equation $x^2 + 4x - p = 0$,then $p$ is equal to