Refraction of Light — Physics STD 10 — Question

A uniform metre rule of mass 100g is balanced on a fulcrum at mark 40cm by suspending an unknown mass m at the mark 20cm. What is the resultant moment now?

State one difference between a musical note and a noise.

State one important advantage and disadvantage each of using nuclear energy for producing electricity.

State when the moment of force is positive and when it is negative.

An erect, magnified, and a virtual image is formed when an object is placed between the optical centre and principal focus of a lens.
(i) Name the lens.
(ii) Draw a ray diagram to show the formation of the image with the above-stated characteristics.

Name two factors on which the magnitude of an induced e.m.f. in the
secondary coil depends.

Name the radiations which are absorbed by the green house gases in the earth's atmosphere.

Write down a relation expressing the mechanical advantage of a lever.

What determines the pitch of a sound?

Distinguish between kilowatt and kilowatt hour