Work, Energy and Power — Physics STD 10 — Question

Is moment of a force a scalar quantity?

How does a magnetic field set up by a solenoid change when cross-sectional area of solenoid is increased?

Explain when we carry weight, on one hand, we bend on the other side.

Two waves A and B have wavelength 0.01 Å and 9000 Å respectively.
(a) Name the two waves.
(b) Compare the speeds of these waves when they travel in vacuum.

State the condition of the following:
A lens has both its focal lengths equal,

What effect do the ultra-violet radiations have on the human body?

What is meant by global warming?

Shows a lemon crusher. Name the class of lever.

A boy does work when he pushes against a brick wall. (yes/no).

Two wires one of copper and other of iron, are of the same length and same radius. Which will have more resistance? Give reason.