Name: ………………………………………………………… Class: ……………………….

UNDERSTANDING SKILLNo. 1:Explain what happens to magnet P and magnet Q when the switch is on.

[4 marks]

No. 2Diagram shows a simple direct current electric motor.

Using the concept of the magnetic effect of an electric current, explain with the aid of diagrams how forces are produced on a wire in the coil, as shown in the diagram above.

[4 marks]

No.3:(i) What is meant by ideal

transformer?[1 mark]

(ii) Explain the working principle of a transformer.

[4 marks]

No. 4:Diagram shows the model of an electricity transmission system.

Most of the electric energy that we are using come from hydroelectric and thermal power station. This power station is connected to each other using cable to transmit electric energy to industries, office, school and house. This system called National grid network.

State the form of energy transfer at hydroelectric power station.

Explain the importance of National grid network system in electricity transmission to consumers.

[4 marks]

No. 5:Radioisotope Strontium-90 is used to measure the thickness of paper in a paper industry.Explain how Strontium-90 is used to measure the thickness piece of paper?

[4 marks]

No. 6:Radioisotopes can be used as tracers to detect leaks from pipes underground. Diagram 12.1 shows a leakthat occurred in an underground water pipe.

(a) What is meant by radioisotopes?[1 mark]

Module Pengayaan/Physics/Module 1

Name: ………………………………………………………… Class: ……………………….

(b) Explain how radioisotopes can be used to detect the location of the leakage as shown in Diagram.

[3 marks]

Module Pengayaan/Physics/Module 1