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Science questions, unit 11
Nama / NameKelas / ClassTarikh / Date

Galaxy

44 marks. Use Practice to check each answer as you go, or Exam to answer everything first. Ask a grown-up to help you mark the written answers.

Section A: objective questions

12 marks
Choose the best answer for each question.
1

Question 1

What is a galaxy?
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C
A galaxy is a system of millions of stars, gases, dust and other types of matter.
For the teacher: Remembering, low difficulty, standard 11.1.1
Textbook p. 180
2

Question 2

Which is not a shape of galaxy?
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A
Galaxies are spiral, elliptical or irregular.
For the teacher: Remembering, low difficulty, standard 11.1.1
Textbook p. 182
3

Question 3

Earth is part of which galaxy?
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D
Earth and the Solar System are in the Milky Way galaxy.
For the teacher: Understanding, low difficulty, standard 11.1.2
Textbook p. 183
4

Question 4

The Milky Way is a
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B
The textbook describes it as a barred spiral galaxy with two main arms.
For the teacher: Understanding, low difficulty, standard 11.1.2
Textbook p. 184
5

Question 5

Diagram 1 shows three galaxies. The left galaxy has curved arms turning around a bright centre. What type of galaxy is it?
Three galaxy pictures: a galaxy with curved arms, a smooth oval glow and one with no clear shape
Diagram 1
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B
Curved arms around a bright centre show a spiral galaxy.
For the teacher: Applying, medium difficulty, standard 11.1.1
Textbook p. 182
6

Question 6

Where is the Solar System found in the Milky Way?
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D
The Solar System is at the edge of one of the spiral arms.
For the teacher: Understanding, low difficulty, standard 11.1.3
Textbook p. 185
7

Question 7

How many stars can a galaxy hold?
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A
Galaxy sizes range from several million to several trillion stars.
For the teacher: Understanding, low difficulty, standard 11.1.1
Textbook p. 180
8

Question 8

Why do we see only a band of stars of the Milky Way from Earth?
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C
Earth is within the galaxy at the edge, so only part of it is seen.
For the teacher: Applying, medium difficulty, standard 11.1.2
Textbook p. 185
9

Question 9

The Solar System is imagined as the diameter of a pencil. The Milky Way is then about as big as
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A
The textbook compares the Milky Way to the school field.
For the teacher: Understanding, low difficulty, standard 11.1.4
Textbook p. 187
10

Question 10

Which statement is correct?
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C
The Milky Way holds billions of stars; the Solar System is one tiny part of it.
For the teacher: Analysing, medium difficulty, standard 11.1.4
Textbook p. 187
11

Question 11

Why is it called the Milky Way?
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D
The ancient Romans imagined the band of stars as spilled milk.
For the teacher: Remembering, low difficulty, standard 11.1.2
Textbook p. 183
12

Question 12

In the school field simulation, what does the hockey ball represent?
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B
The ball at position F stands for the Solar System.
For the teacher: Analysing, medium difficulty, standard 11.1.5
Textbook p. 188

Section B: structured questions

32 marks
Answer all questions. Circle the answer or write it in the space.
13

Question 13

Answer the questions about galaxies.
[2 marks] (a)What is a galaxy?
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Tick each point you got.
[3 marks] (b)State the three shapes of galaxy.
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Tick each point you got.
[1 mark] (c)The universe contains
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billions of galaxies
For the teacher: Remembering, low difficulty, standard 11.1.1
Textbook p. 180
14

Question 14

Diagram 2 shows the Milky Way galaxy.
The Milky Way: bright barred centre with spiral arms and a yellow dot for the Solar System
Diagram 2
[1 mark] (a)What type of galaxy is the Milky Way?
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Tick each point you got.
[1 mark] (b)Name the part of the galaxy that is bright and thick.
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Tick each point you got.
[1 mark] (c)How many main arms does the Milky Way have?
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Tick each point you got.
[1 mark] (d)The yellow dot in Diagram 2 shows the position of something. What is it?
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Tick each point you got.
[1 mark] (e)Which is bigger, the Milky Way or the Solar System?
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Tick each point you got.
For the teacher: Understanding, low difficulty, standard 11.1.2
Textbook p. 184
15

Question 15

Chua looks at the night sky from a very dark place and sees a dim band of stars.
[1 mark] (a)Name the galaxy that he sees.
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Tick each point you got.
[1 mark] (b)Why can he see this galaxy from Earth?
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Tick each point you got.
[1 mark] (c)Where is the Solar System located in this galaxy?
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Tick each point you got.
[1 mark] (d)The Sun is
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a star in the Milky Way
[2 marks] (e)The Solar System has the Sun, Earth and seven other planets. How many planets does it have altogether? Show your working.
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Tick each point you got.
For the teacher: Applying, low difficulty, standard 11.1.3
Textbook p. 185
16

Question 16

The size of the Solar System is imagined as the diameter of a pencil.
[1 mark] (a)What is the size of the Milky Way galaxy in this comparison?
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Tick each point you got.
[2 marks] (b)What conclusion can you make about the size of the Solar System in the Milky Way?
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Tick each point you got.
[1 mark] (c)Why must the simulation not be taken as the actual scale?
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Tick each point you got.
For the teacher: Analysing, medium difficulty, standard 11.1.4
Textbook p. 187
17

Question 17

Pupils run a simulation on the school field. Pupil A stands in the middle. Pupil B stands 30 m from A and walks around A, sprinkling flour to make a circle. A hockey ball is placed inside the circle.
[1 mark] (a)What does pupil A represent?
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Tick each point you got.
[1 mark] (b)What does the circle of flour represent?
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Tick each point you got.
[1 mark] (c)What does the hockey ball represent?
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Tick each point you got.
[1 mark] (d)What is the radius of the circle?
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Tick each point you got.
[2 marks] (e)What is the diameter of the circle? Show your working.
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Tick each point you got.
For the teacher: Applying, medium difficulty, standard 11.1.5
Textbook p. 188
18

Question 18

Aina says, "The Solar System is a galaxy because it has stars and planets."
[1 mark] (a)Is Aina correct?
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No
[2 marks] (b)Give a reason for your answer.
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Tick each point you got.
[2 marks] (c)Arrange these from smallest to biggest: Milky Way galaxy, Earth, universe, Solar System.
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Tick each point you got.
For the teacher: Evaluating, high difficulty, standard 11.1.4
Textbook p. 191