Spectrum — Physics STD 10 — Question

What do you mean by Atomic number

How is heat capacity of a body related to specific heat capacity of its substance?

Define power. State two mathematical expressions for power.

An electric bulb is rated as 100W – 250V. What information does it convey? Calculate the resistance of its filament while glowing.

Give two examples of work done.

On what factor does the position of the centre of gravity of a body depend? Explain your answer with an example.

You are required to make an electromagnet from a soft iron bar by using a cell, an insulated coil of copper wire and a switch. (a) Draw a circuit diagram to represent the process. (b) label the poles of the electromagnet.

A machine raises a load of 750 N through a height of 16 m in 5 s. calculate:
(i) energy spent by machine,
(ii) power at which the machine works.

Draw Diagrams to illustrate the position of fulcrum load and effort, in the following:
A common balance .

The efficiency of a pulley is always less than 100%.