Thermodynamics — Physics STD 11 Science — Question

Oxygen and hydrogen are at the same temperature T. What is the ratio of kinetic energies of oxygen molecule and hydrogen molecule when oxygen is 16 times heavier than hydrogen?

State if the following statements is true or false. Give reasons for your answer:
In an inelastic collision, the final kinetic energy is always less than the initial kinetic energy of the system.

A hunter takes aim right at the sitting monkey on tree. As soon as the hunter releases the bullet, the monkey falls veritcally down from the tree. Will the bullet hit the monkey? Does whether the monkey gets hit or not depends on the initial velocity of the bullet?

Are all solid bodies rigid?

State if the following statements is true or false. Give reasons for your answer:
Work done in the motion of a body over a closed loop is zero for every force in nature.

The linear momentum of the body can change only in the direction of applied force. Comment.

An AC source is connected to a capacitor. Will the rms current increase, decrease or remain constant if a dielectric slab is inserted into the capacitor?

What is the ratio of the distances covered by a freely falling object in its first and second seconds?

What is the unit of Planck's constant?

A square framed with a wire of side 'L' is dipped in a liquid. On taking out, a membrane is formed. What will be the force acting on the frame if the surface tension of liquid is S?