Summative Practice (Question 3, 4 & 5) – Form 4 Science (KSSM) Chapter 12

Question 3:
Reaction X always occurs in the Sun.
(a) What is the reaction?
(b) Explain why the reaction can occur on the surface of the Sun.
(c) What would happen on Earth if the reaction you mentioned in question 3(a) suddenly stops?

(a) Nuclear fusion

(b) The Sun has very high temperature/ Rich in hydrogen

(c) Earth would not receive sunlight and heat anymore. All living things cannot survive.

Question 4:
Figure 2 shows part of a nuclear power station.

(a) What is the process that occurs in K?
(b) What is the purpose of the process you mentioned in question 4(a)?
(c) K has various safety features. State two safety features in K.
(d) Predict the impact if there is a leakage in the structure of K.

(a) Nuclear fission

(b) To produce a lot of heat

• It has 2 m-thick walls that are made of concrete and lead

• Has boron control rods that absorb excess neutrons so that reaction is under control

Leakage of radioactive radiation occurs.

Question 5:
A nuclear reactor can produce nuclear energy on a large scale to generate electricity.

Based on the statement above, explain the way nuclear energy is converted into electricity in a nuclear power station.

• Nuclear energy can be converted into electricity using the nuclear reactor.

• The nuclear energy released in the form of heat energy, is used to heat water and produce steam.

• The steam produced is used to spin turbines and generate electricity.

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