Which one of the following statements is correct with respect to basic character?

$A$ plane passing through $(-1, 2, 3)$ and whose normal makes equal angles with the coordinate axes is

Who first discovered lichens?

Which of the following is known as 'Oxone'?

Which of the following is an example of a heterogeneous catalysis reaction?

The bob of a simple pendulum is displaced from its equilibrium position $O$ to a position $Q$ which is at height $h$ above $O$ and the bob is then released. Assuming the mass of the bob to be $m$ and time period of oscillations to be $2.0\ s$,the tension in the string when the bob passes through $O$ is