Science [1 Marks Each] QUE - ANS

Classify the following materials into electrical conductors and electrical insulators Leather, iron needle, ebonite rod, key, plastic, graphite (pencil lead), wool, silk, acid, pure water, rubber, aluminium, human body, air, salty water.

How will you decide whether a bulb is fused or not?

What do you mean by a closed electric circuit?

List four devices that use electricity.

What is the principle of an electric cell?

What is the function of a filament in an electric bulb?

When does an electric cell stop producing electricity?

How many terminals does an electric cell have? Which?

What are the uses of an electric cell?

Which two metals are the best conductor of electricity?

Give two examples of electrical insulators.

Give two examples of electrical conductors.

What do we call a continuous circuit in which current is flowing?

What is the direction of electric current in an electric circuit?

Which part of a torch bulb gives us light?

What do we call the closed loop in which electric current flows?

Which is the negative terminal of the electric cell?

Which is the terminal having metal cap on the top of an electric cell?

From what does the torch bulb get energy?

Using the ‘conduction tester’ on an object it was found that the bulb begins to glow. Is that object a conductor or an insulator? Explain.