Electric Power and House hold Circuits — Physics STD 10 — Question

Which class of lever found in the human body is being used by a boy when he raises the weight of his body on his toes?

How does the angle of minimum deviation produces by a prism change with increase in :
the refracting angle of prism?

What type of lenses are used in spectacles worn by an old lady for knitting?

State the energy changes which take place when:
Photographic film is exposed to sunlight.

Name the lens for which magnification is always less than 1.

A blade, fixed at one end, is made to vibrate by pressing its other end and then releasing it. State one way in which the frequency of vibrations of the blade can be lowered.

Name the principle on which a transformer works.

Can a simple machine act as a force multiplier and a speed multiplier at the same time?

Name the material of wire used for making standard resistances. Give a reason.

How does the resistance of a metallic wire depend on the thickness of wire?