Form 3 Chapter 9

Form 3 Science Chapter 9

FORM 3 CHAPTER 9 STAR AND GALAXIES

1. Diagram 1 shows the structure of the sun.

R: ……………………………….. S: ………………………………. Y

T: ……………………………..

Diagram 1

(a) On Diagram 1, label R, S T with the following words. Chromosphere

Corona

Photosphere [3 marks]

(b) At Y, four hydrogen nuclei combine to form a helium nucleus to release energy. What are the forms of energy released during this nuclear fusion? ……………………………………………………………………………………………………. [1 mark]

(c) Name one phenomenon that takes place at chromosphere. ……………………………………………………………………………………………………… [1 mark] (d) Name the layer of the Sun that is seen from the Earth. ………………………………………………………………………………………………………. [1 mark]

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Form 3 Science Chapter 9

2. Diagram 2 shows the birth and death of stars. P

Q

R

S

Diagram 2 (a) Name the parts labelled P : ……………………………………………………………………………………………… Q : ……………………………………………................................................................... R : ……………………………………………………………………………………………… S : ……………………………………………………………………………………………….. [4 marks] (b) What causes the nebula to become dense?

…………………………………………………………………………………………… [1 mark] (c) What happens to the core of a ball of gas as it becomes denser? …………………………………………………………………………………………………….. [1 mark] (d) What happens to the star at stage P? ……………………………………………………………………………………………………... [1 mark] (e) Describe what happens to the star at stage Q. ……………………………………………………………………………………………………… [1 mark]

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Form 3 Science Chapter 9

3. Diagram 3 shows three different types of galaxy, P, Q, and R.

P: ………………………….

Q: ………………………….

R: ………………………….

Diagram 3 (a) Label P, Q and R with the following words. Elliptical

Spiral

Irregular [3 marks]

(b) Arrange the stars below according to their temperature in descending order. White

Red

Blue

Yellow

1. …………………….. 2. …………………….. 3. …………………….. 4. …………………… [2 marks] (c) Name the star in the solar system. ……………………………………………………………………………………………………… [1 mark] (d) What unit do we use to measure the distance between the Earth and the stars? ……………………………………………………………………………………………………… [1 mark]

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