Properties of Matter — Physics STD 11 — Question

If a liquid wets a solid surface, the angle of contact is …….

The force which opposes the initiation of motion of an object on the surface is –

A bird flying in the sky is an example of –

The kinetic energy of a body is given by

The ratio of the displacement vector to the corresponding time interval is –

The molecular weights of oxygen and hydrogen are 32 and 2, respectively. The rms velocities of their molecules at a given temperatures, will be in the ratio

If the work done by the force on the body is positive then its kinetic energy

The random error in the arithmetic mean of 50 observations is ‘a’, then the random error in the arithmetic mean of 200 observations a would be

Which of the following will make the volume of an ideal gas four times?