Glucose and mannose are

In the circuit shown,a potential difference of $60\,V$ is applied across $AB$. The potential difference between the points $M$ and $N$ is.....$V$

Which of the following statements is false regarding the properties of electromagnetic waves?

If $\cos (x-y), \cos x, \cos (x+y)$ are three distinct numbers which are in harmonic progression and $\cos x \neq \cos y$,then $1+\cos y$ is equal to

Which of the following statements is true for transition elements?

The image of the point $(3, 8)$ in the line $x + 3y = 7$ is