Work, Energy and Power — Physics STD 10 — Question

Give an example
Electrical energy changes to heat energy.

What do you mean by a rheostat?

What kind of energy change takes place when a magnet is moved inside a coil having a galvanometer at its ends? Name the phenomenon.

Name the characteristic which enables one to distinguish the sound of two musical instruments even if they are of the same pitch and same loudness.

In the following case write yes, if the work is being done and no if no work is being done.
A man moving on the rough ground.

Name a common device that uses electromagnets.

A lens forms an erect, magnified and virtual image of an object. name the type of lens.

Name the radiation which can be detected by thermopile.

Two forces each of magnitude 2 N act vertically upward and downward respectively on two ends of a uniform rod of length 1 m, freely pivoted at its centre. Determine the resultant moment of forces about the mid-point of the rod.

Explain a person walking past a railway line, in the middle of night hears a ringing sound along with the sound of his footsteps.