Current Electricity — Physics STD 10 — Question

In the following case write yes, if the work is being done and no if no work is being done.
A coolie standing with a heavy load on his head

What are infrasonic waves?

How is the critical angle related to the refractive index of a medium?

Name the form of energy which a body may possess even when it is not in motion. Give an example to support your answer.

(a) State the CGS and SI units of work.
(b) How is joule related to erg?

State one way of increasing the frequency of a note produced by an air column.

Name a machine which is used to:
change the direction of force applied.

A lens forms the image of an object placed at a distance 15 cm from it, at a distance 60 cm in front of it. Find : the nature of image.

What do you understand by the invisible spectrum?

(a) What do you understand by the term nucleons?
(b) Which of the radionctive radiations:
(i) can cause severe genetical disorders,
(ii) are deflected by an electric field?