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Science questions, unit 1
Nama / NameKelas / ClassTarikh / Date

Scientific skills

38 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

10 marks
Choose the best answer for each question.
1

Question 1

Which of the following is not a science process skill?
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C
Memorising is not a science process skill. The twelve skills include classifying, predicting and controlling variables.
For the teacher: Remembering, low difficulty, standard 1.1.1
Textbook p. 11
2

Question 2

Before the race, Raju and his friends agree to keep the shape, size and mass of all the balloon cars the same and to change only the size of the balloon. Which science process skill is this?
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B
Changing one thing and keeping the others the same (shape, size and mass) is controlling variables.
For the teacher: Understanding, low difficulty, standard 1.1.10
Textbook p. 4
3

Question 3

Diagram 1 shows the distance travelled by three balloon cars. Which car travelled the farthest?
Bar chart: Alia 12 cm, Raju 30 cm, Chua 38 cm
Diagram 1
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A
Chua's bar is the tallest (38 cm), so her car travelled the farthest.
For the teacher: Applying, low difficulty, standard 1.1.8
Textbook p. 6
4

Question 4

Chua's car travelled 38 cm and Alia's car travelled 12 cm. How much farther did Chua's car travel than Alia's car?
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C
38 cm − 12 cm = 26 cm.
For the teacher: Applying, low difficulty, standard 1.1.3
Textbook p. 6
5

Question 5

In the experiment, the pupils use balloons of different sizes to see how far the balloon car travels. What is the manipulated variable?
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D
The size of the balloon is the one thing the pupils change on purpose.
For the teacher: Understanding, low difficulty, standard 1.1.10
Textbook p. 4
6

Question 6

Alia's balloon car travelled the shortest distance. Which is the best inference?
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B
An inference is a sensible reason. Option C is an observation and option D is a prediction.
For the teacher: Analysing, medium difficulty, standard 1.1.4
Textbook p. 6
7

Question 7

Which statement is a prediction?
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D
A prediction says what will happen, here from a pattern. The others are observations.
For the teacher: Applying, low difficulty, standard 1.1.5
Textbook p. 7
8

Question 8

Laili pours 100 mℓ of fresh milk and 100 mℓ of shampoo through a measuring cylinder. The milk takes 2 seconds and the shampoo takes 8 seconds. Which is a suitable hypothesis?
Fresh milk pouring out in 2 seconds and shampoo pouring out in 8 seconds
Diagram 2
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C
A hypothesis links the manipulated variable (thickness of the liquid) with the responding variable (time to flow) and states the pattern.
For the teacher: Analysing, medium difficulty, standard 1.1.11
Textbook p. 12
9

Question 9

Alia says, "The balloon car that travelled the farthest is the fastest." How can the pupils be sure which car is the fastest?
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A
Speed depends on distance and time. The fastest car takes the shortest time to travel the same distance.
For the teacher: Evaluating, high difficulty, standard 1.1.9
Textbook p. 7
10

Question 10

In the Magic Water activity, hot green water in glass B is placed on top of cold red water in glass A. When the plastic sheet is pulled out slowly, the two colours stay in two layers. What is the best inference?
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B
The sheet was removed, so something else keeps the layers apart. Hot water is lighter (less dense) than cold water, so it stays above it.
For the teacher: Understanding, medium difficulty, standard 1.1.4
Textbook p. 9

Section B: structured questions

28 marks
Answer all questions. Circle the answer or write it in the space.
11

Question 11

Diagram 3 shows the distance travelled by the balloon cars of Raju, Alia and Chua.
Table of distances: Raju 30, Alia 12, Chua 38 cm, and a pupil explaining that Alia's balloon is small
Diagram 3
[1 mark] (a)Which car travelled the shortest distance?
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Alia's car
[1 mark] (b)Write the cars in order, from the farthest distance to the shortest distance.
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Tick each point you got.
[1 mark] (c)Chua tells Alia, "The size of your balloon is small and contains the least amount of air." Which science process skill is Chua using?
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Making inferences
He gives a sensible reason for what was observed (the shortest distance).
For the teacher: Applying, low difficulty, standard 1.1.8
Textbook p. 6
12

Question 12

The pupils want to find out whether the size of the balloon affects the distance travelled by a balloon car.
[1 mark] (a)State the manipulated variable.
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Tick each point you got.
[1 mark] (b)State the responding variable.
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Tick each point you got.
[1 mark] (c)State one constant variable.
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Tick each point you got.
[1 mark] (d)Write a hypothesis for the experiment.
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A hypothesis links the two variables with a pattern.
Tick each point you got.
For the teacher: Analysing, low difficulty, standard 1.1.10
Textbook p. 4
13

Question 13

Alia says, "The car that travelled the farthest is also the fastest."
[1 mark] (a)Is Alia's statement always correct?
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No
A car can go far but slowly, so the time must be measured too.
[1 mark] (b)What must the pupils measure, as well as the distance, to find the fastest car?
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Tick each point you got.
[1 mark] (c)Car P travels 60 cm in 3 seconds and car Q travels 60 cm in 4 seconds. Which car is faster?
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Tick each point you got.
For the teacher: Evaluating, high difficulty, standard 1.1.9
Textbook p. 7
14

Question 14

Aini changes the mass of a balloon car by adding 10 sen coins to it. Diagram 4 shows her results (practice numbers, not from the book).
Line graph: 0 coins 40 cm, 4 coins 32 cm, 8 coins 25 cm, 12 coins 17 cm
Diagram 4
[1 mark] (a)What distance does the car travel with 8 coins?
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Tick each point you got.
[1 mark] (b)State the pattern shown by the graph.
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Any 1 points
Tick each point you got.
[1 mark] (c)Predict the distance travelled with 16 coins.
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Tick each point you got.
[1 mark] (d)Is the hypothesis "The lighter the balloon car, the farther the distance it travels" accepted or not accepted?
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Accepted
For the teacher: Analysing, medium difficulty, standard 1.1.8
Textbook p. 8
15

Question 15

Diagram 5 shows two mangoes of the same type from different orchards. Mango A has a mass of 400 g and tastes sour. Mango B has a mass of 600 g and tastes sweet.
Two green mangoes labelled A and B; B is larger
Diagram 5
[1 mark] (a)Write one observation about the differences between the two mangoes.
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Any 1 points
Tick each point you got.
[1 mark] (b)Make one inference from your observation.
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Any 1 points
Tick each point you got.
[1 mark] (c)State one more observation that supports your inference.
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Tick each point you got.
For the teacher: Analysing, medium difficulty, standard 1.1.4
Textbook p. 11
16

Question 16

Diagram 6 shows the animals reared by Pak Teh: a cat, a cow, a goat, a hen, a duck and a swan.
A cat, a cow, a goat, a hen, a duck and a swan in front of a wooden house
Diagram 6
[1 mark] (a)State one common characteristic of all the animals.
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Tick each point you got.
[1 mark] (b)Suggest a characteristic that can be used to sort the animals into two groups.
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Any 1 points
Tick each point you got.
[2 marks] (c)Name the animals in each group in (b).
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With 'fur or feathers' the groups are the same.
Tick each point you got.
For the teacher: Creating, low difficulty, standard 1.1.2
Textbook p. 12
17

Question 17

Diagram 7 shows the Magic Water activity. Glass A has cold red water and glass B has hot green water.
Six photos of the Magic Water activity: two glasses, colouring, plastic sheet, glass B upside down on A, sheet pulled out
Diagram 7
[1 mark] (a)Write one observation after the plastic sheet is pulled out slowly.
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Tick each point you got.
[1 mark] (b)Give a reason for your observation.
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Tick each point you got.
[1 mark] (c)Name one safety precaution in this activity.
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Tick each point you got.
[1 mark] (d)Write one constant variable that makes the test fair.
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Tick each point you got.
For the teacher: Applying, low difficulty, standard 1.1.12
Textbook p. 9
18

Question 18

Raju builds a balloon car (the lengths here are practice numbers, not from the book). He cuts two non-flexible drinking straws, each 11 cm long, and two skewer sticks, each 15 cm long.
[1 mark] (a)Which science process skill does Raju use to cut the straws at 11 cm?
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Measuring and using numbers
[1 mark] (b)How much longer is one skewer stick than one straw?
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Tick each point you got.
[1 mark] (c)State one safety rule when using the scissors.
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Tick each point you got.
For the teacher: Applying, low difficulty, standard 1.1.3
Textbook p. 2