Sources of Energy — Science STD 10 — Question

Name two devices whose working is based on the phenomenon of persistence of vision.
(OR)
Name any two applications based on persistence of vision.

State one characteristic which shows that the birds are very closely related to dinosaurs.

With which process are the following ancient structures associated?
Kulhs, Eris, Surangams, Kattas, Pynes.

Where is urine carried through ureters?

Write the functions of the following: Fallopian tubes/ducts.

Name two metals which are used:
For making jewellery and to decorate sweets.

Give the constituents and one use of brass.

Which way does the wire in the diagram below tend to move?

In a d.c. motor, why must the current to the coil be reversed twice during each rotation?

There is an oil layer on the water surface of river in your area. What will you do?