PART - 2 CH - 10 Thermal Properties of Matter — Physics STD 11 Science — Question

Why can a Carnot's engine not get 100% efficiency?

On what does the modulus of elasticity depends?

Give dimensions of Solar Constant and Water Equivalent.

Can sound waves be propagated in all the three states of matter?

A mass M is broken into two parts: m and (M - m). How is m related to M so that the gravitational force between two parts is maximum?

When we step barefoot into an office with a marble floor, we feel cold. Why?

What is the value of specific heat of water in S.I. units? Does it vary with temperature?

For which condition, the distance and the magnitude of displacement of an object have the same values?

Explain this statement clearly:
“To call a dimensional quantity ‘large’ or ‘small’ is meaningless without specifying a standard for comparison”. In view of this, reframe the following statements wherever necessary:

1. Atoms are very small objects
2. A jet plane moves with great speed
3. The mass of Jupiter is very large
4. The air inside this room contains a large number of molecules
5. A proton is much more massive than an electron
6. The speed of sound is much smaller than the speed of light.

Among the following quantities, select such pairs which have the same dimensions; momentum, angular velocity, torque, pressure, impulse, surface tension, stress, work, frequency, force constant.