Thermodynamics — Physics STD 11 Science — Question

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.

Write the dimension of modulus of elasticity?

Water is flowing through a pipe of non- uniform area of cross-section. The velocity of water at point A is four time the velocity of water at another point B. What would be the diameter of the pipe at point A relative to point B?

A coolie with load on his head is walking on a horizontal plateform. What is work done against gravity?

Is air a material medium? Name two characteristics of the material medium necessary for the onward propagation of momentum and energy.

A laser light is focused by a converging lens. Will there be a significant chromatic aberration?

Define uniformly accelerated motion.

A steel ball is floating in a trough of mercury. If we fill the empty part of the trough with water, what will happen to the steel ball?

If the potential energy at any position of a particle performing simple harmonic motion is half of the total energy, then what will be the displacement at that position?

If the n forces are acting on an object can be expressed sequentially by the sides of n sided polygon, then the object will be.............