Current Electricity — Physics STD 10 — Question

Draw a neat diagram for the verification of Ohm’s law by voltmeter-ammeter method. By another diagram show the relation between p.d. and current.

Give scientific reason for the following:
It is easier to push a boy standing on one leg than on both legs.

What do you understand by a simple machine?

After a robbery, if a window has been broken, there will be tiny particles of glass. Some of these will be found at the scene of the crime and some may be caught in the thief’s clothing. If the police can prove that these particles are identical, they have a strong case.
A method of doing this is to suspend the particles of glass in a special liquid. Light of a single colour is thrown through the liquid and the particles viewed through a microscope. The temperature of the liquid is then slowly altered. This alters the speed of light through the liquid (i.e., it alters the refractive index). At one particular temperature, the particles of glass disappear. It this happens at the same temperature for both sets of glass particles, they probably came from the same broken pane of glass.
Complete and copy the diagram to show how light bends when it travels from the liquid to the glass and back to the liquid, If the light slows down in the glass.

A body is thrown vertically upwards. Its velocity keeps on changing. What happens to its K.E. when does its velocity become zero?

What are isobars? Give one example.

Name the physical quantity whose unit is kgfm. Define it.

Write two uses of pulleys. Is pulley a force multiplier?

Give one example of a controlled and uncontrolled nuclear fission reaction.