Magnetic Effect of Current — Physics STD 10 — Question

Why does a spanner have a long handle?

In which of the following cases, is work being done?
(i) A man pushing a wall.
(ii) a coolie standing with a load of 12 kgf on his head.
(iii) A boy climbing up a staircase.

For which colour of white light, is the refractive index of a transparent medium the least?

Name the unit in which loudness of sound is measured.

Name the physical quantity whose SI unit is Nm.

Name the unit used to measure the sound level.

What do you mean by a solenoid?

When an alpha particle gains two electrons it becomes neutral and becomes an atom of an element which is a rare gas. What is the name of this rare gas?

Give two such properties of infrared radiations which are not true for visible light.

State the condition when a body is in static equilibrium. Give one example of static equilibrium.