Class 11th

Which among the following is not an aromatic species?

The maximum prescribed concentration of manganese in drinking water is

Angular momentum of electron in 3rd stationary orbit of hydrogen atom is

56 g of CO contains (NA = Avogadro's No.)

The displacement wave in a string is given as y = 5sin(62.8x – 157t). Here y and x are in cm and t in second. The wavelength of the wave is

A man is swimming with speed 10 km/h in still water crosses a river of width 1 km along the shortest path in 10 minutes. The velocity of river flow is

In an isobaric process, the absolute temperature is doubled. The mean free path (l) and the  relaxation time (t) will become respectively

If then angle between A and B will be

The potential energy of a particle varies with x according to the relation U(x) = x² – 4x. The point x = 2 is a point of

Determine the energy required to launch a satellite of mass m from the surface of a planet of mass M and radius R in a circular orbit at an altitude of 3R.