Science questions, unit 1

Nama / NameKelas / ClassTarikh / Date

Scientific skills

40 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.

Question 1

Melia looks at the paper planes in the hall. Which statement is an observation?

The paper planes have a sharp nose cone.
The paper plane will fly very far.
Maybe the large wings make it stable.
The larger the wings, the farther it flies.

Show answerHide answer

An observation is what we sense. B is a prediction, C is an inference and D is a hypothesis.

For the teacher: Remembering, low difficulty, standard 1.1.1

Textbook p. 4

Question 2

Ana says to Ravi, "I predict that your paper plane will fly far because of the large size of its wings." What is a prediction?

A reason for what we observe
A way of sorting things into groups
A statement about what will happen, based on evidence
A number measured with a tool

Show answerHide answer

To predict is to say what will happen next, using observations, experience or a pattern.

For the teacher: Understanding, low difficulty, standard 1.1.5

Textbook p. 3

Question 3

Mr Zaki gives every pupil the same type, size and thickness of paper. What are these?

Manipulated variables
Constant variables
Responding variables
Hypotheses

Show answerHide answer

Variables that are kept the same to make the test fair are constant (fixed) variables.

For the teacher: Understanding, low difficulty, standard 1.1.10

Textbook p. 4

Question 4

In the paper plane investigation, a plane is launched with a rubber band stretched for 10 cm, 20 cm and 30 cm. What is the manipulated variable?

Rubber band fastened to a paper clip and pencil, stretched and released — Diagram 1

Distance travelled by the paper plane
Type of paper used
Mass of the paper clip
Length of the stretched rubber band

Show answerHide answer

The length of the stretched rubber band is the thing the pupils change on purpose.

For the teacher: Applying, low difficulty, standard 1.1.10

Textbook p. 6

Question 5

Which is the operational definition of the durability of soap bubbles?

The time taken for the soap bubbles to burst
The size of the soap bubbles
The quantity of glycerine added
The colour of the soap solution

Show answerHide answer

An operational definition says what is measured. Durability is measured by the time taken for the bubbles to burst (page 12).

For the teacher: Understanding, medium difficulty, standard 1.1.9

Textbook p. 12

Question 6

Diagram 2 shows the results of the soap bubble experiment. How long did the bubble last when 3 tablespoons of glycerine were used?

Line graph: 1 tablespoon 45 seconds, 3 tablespoons 120 seconds, 5 tablespoons 145 seconds — Diagram 2

45 seconds
100 seconds
120 seconds
145 seconds

Show answerHide answer

At 3 tablespoons the point is at 120 seconds.

For the teacher: Applying, low difficulty, standard 1.1.8

Textbook p. 13

Question 7

Diagram 3 shows a seedling every 2 days. What is the space-time relationship?

Four stages of a seedling, each 2 days apart, getting taller — Diagram 3

The seedling becomes shorter as the days pass.
The size and height of the seedling increase as the days pass.
The seedling stays the same size.
The number of seedlings decreases.

Show answerHide answer

Space-time relationship describes how something changes with time. The seedling grows taller with the number of days.

For the teacher: Applying, low difficulty, standard 1.1.7

Textbook p. 17

Question 8

Large logs float on water, as in Diagram 4. Which is the best inference?

Large logs floating on a lake — Diagram 4

The logs are heavier than the water.
The logs have been painted.
The water is flowing fast.
The logs are less dense than water.

Show answerHide answer

Objects float when they are less dense than the liquid (page 15, answer for Mind Test 1).

For the teacher: Analysing, medium difficulty, standard 1.1.4

Textbook p. 15

Question 9

Diagram 5 shows the turtles that landed on a beach in State M. What is the total number of turtles that landed in 2013 and 2014?

Picture chart: 2013 four turtles, 2014 two, 2015 one, 2016 one, 2017 two, 2018 three; each turtle picture stands for 100 turtles — Diagram 5

Show answerHide answer

2013: 4 × 100 = 400. 2014: 2 × 100 = 200. 400 + 200 = 600 turtles.

For the teacher: Applying, low difficulty, standard 1.1.6

Textbook p. 16

Question 10

Ana wants to find out how glycerine affects soap bubbles. Which is a suitable hypothesis?

The more glycerine is used, the longer the time taken for the bubbles to burst.
To investigate the quantity of glycerine and the bubbles.
Does glycerine affect the time taken for the bubbles to burst?
The time taken for the soap bubbles to burst.

Show answerHide answer

A hypothesis relates the manipulated and responding variables. B is the aim, C is the problem statement and D is a responding variable.

For the teacher: Applying, medium difficulty, standard 1.1.11

Textbook p. 9

Question 11

Diagram 6 shows six objects. Which group lists only kitchen utensils?

A pencil, an oven mitt, a hole puncher, a wooden ladle, a kettle and a stapler — Diagram 6

Pencil, hole puncher, stapler
Oven mitt, wooden ladle, kettle
Pencil, wooden ladle, stapler
Oven mitt, hole puncher, kettle

Show answerHide answer

The oven mitt, wooden ladle and kettle are used in the kitchen. The pencil, hole puncher and stapler are stationery.

For the teacher: Remembering, low difficulty, standard 1.1.2

Textbook p. 16

Question 12

Siti wants to find out whether the size of the wings affects the distance a paper plane travels. Which plan is a fair test?

Use large wings on thick card and small wings on thin paper
Use large wings on A4 paper and small wings on newspaper
Launch the large plane from a table and the small plane from the floor
Use the same paper and same folding design; only change the size of the wings

Show answerHide answer

Only the manipulated variable (wing size) may change. Paper type, thickness, design and launch height must stay the same.

For the teacher: Evaluating, high difficulty, standard 1.1.10

Textbook p. 4

Section B: structured questions

28 marks

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

Question 13

Aiman launches a paper plane using a rubber band stretched for 10 cm, then 20 cm, then 30 cm. He measures the distance travelled each time.

[1 mark] (a)State the manipulated variable.

Show answerHide answer

Length of the stretched rubber band1

Tick each point you got.

[1 mark] (b)State the responding variable.

Show answerHide answer

Distance travelled by the paper plane1

Tick each point you got.

[1 mark] (c)State one constant variable.

Show answerHide answer

Type / size / thickness of the paper (or the same paper plane / same paper clip / same person launching)1

Tick each point you got.

[1 mark] (d)Write a hypothesis for this investigation.

Show answerHide answer

The longer the stretched rubber band, the farther the distance travelled by the paper plane1

Tick each point you got.

[1 mark] (e)Give the operational definition of the distance travelled by the paper plane.

Show answerHide answer

Any 1 points

The length from the starting point to where the paper plane lands, measured with a measuring tape1
Accept: the distance measured from the start to where the plane stops1

Tick each point you got.

For the teacher: Analysing, low difficulty, standard 1.1.10

Textbook p. 7

Question 14

A soap bubble made with one tablespoon of glycerine bursts after a short time.

[1 mark] (a)Write one observation.

Show answerHide answer

The soap bubble burst quickly / the bubble lasted a short time1

Tick each point you got.

[1 mark] (b)Give an inference for the observation.

Show answerHide answer

Any 1 points

Maybe the quantity of glycerine is too little1
Maybe there was wind1

An inference is a reason. It starts with "Maybe...".

Tick each point you got.

For the teacher: Understanding, low difficulty, standard 1.1.4

Textbook p. 13

Question 15

Diagram 7 shows the glycerine and soap bubble results.

[1 mark] (a)How many tablespoons of glycerine made the bubble last longest?

Show answerHide answer

5 tablespoons1

Tick each point you got.

[1 mark] (b)How much longer did the bubble last with 5 tablespoons than with 1 tablespoon?

Show answerHide answer

100 seconds (145 − 45 = 100) – the unit is needed1

Tick each point you got.

[1 mark] (c)Is the hypothesis "the more glycerine, the longer the time" accepted or not accepted?

AAcceptedBNot accepted

Show answerHide answer

Accepted

The time increases from 45 s to 120 s to 145 s as the glycerine increases.

For the teacher: Applying, low difficulty, standard 1.1.8

Textbook p. 13

Question 16

Diagram 8 shows the colour that blue litmus paper and red litmus paper turned when four substances, J, K, L and M, were tested.

Table of colour change on litmus paper: J blue and blue; K red and red; L blue and red; M red and red — Diagram 8

[1 mark] (a)Classify substance J.

AAcidicBAlkalineCNeutral

Show answerHide answer

Alkaline

J turns red litmus paper blue, so it is an alkali.

[1 mark] (b)Classify substance L.

AAcidicBAlkalineCNeutral

Show answerHide answer

Neutral

L does not change the colour of either litmus paper (blue stays blue, red stays red).

[1 mark] (c)Give the operational definition of an alkali.

Show answerHide answer

Any 1 points

An alkali changes red litmus paper to blue1
Accept: an alkali does not change the colour of blue litmus paper1

Tick each point you got.

For the teacher: Applying, low difficulty, standard 1.1.2

Textbook p. 17

Question 17

Diagram 9 shows how two pupils go to school. Both houses are 1 km from the school.

Pupil A rides a motorcycle with a passenger; Pupil B cycles — Diagram 9

[1 mark] (a)Which pupil will take a shorter time to reach school?

APupil ABPupil B

Show answerHide answer

Pupil A

A motorcycle goes faster than a bicycle over the same distance.

[1 mark] (b)Pupil B takes 15 minutes. Predict the time Pupil A will take.

Show answerHide answer

Less than 15 minutes1

Tick each point you got.

For the teacher: Applying, low difficulty, standard 1.1.5

Textbook p. 15

Question 18

Diagram 10 shows the positions of the planets from the Sun in the Solar System. The position of a planet decides the time it takes to make one complete revolution around the Sun.

The Sun with planets in orbits; Earth and Planet R are labelled — Diagram 10

[1 mark] (a)What is Planet R?

AJupiterBVenusCMercury

Show answerHide answer

Jupiter

Planet R is farther from the Sun than the Earth, so it cannot be Venus or Mercury, which are nearer. The textbook answer for Planet R is Jupiter (page 18).

[1 mark] (b)State the manipulated variable.

Show answerHide answer

The position (distance) of the planet from the Sun1

Tick each point you got.

[1 mark] (c)State the responding variable.

Show answerHide answer

The time taken by the planet to make one complete revolution around the Sun1

Tick each point you got.

[1 mark] (d)Make a hypothesis for this investigation.

Show answerHide answer

The farther the distance of the planet from the Sun, the longer the time taken to revolve around the Sun1

Tick each point you got.

[2 marks] (e)Predict the time taken by Planet R compared with the Earth. Give your inference.

Show answerHide answer

Longer than the Earth [1 mark]1
Because its orbit is larger / it is farther from the Sun [1 mark]1

Tick each point you got.

For the teacher: Evaluating, medium difficulty, standard 1.1.11

Textbook p. 18

Question 19

Diagram 11 shows the distance travelled by a paper plane for three lengths of stretched rubber band (sample results made up for practice).

Bar chart: 10 cm 180 cm, 20 cm 310 cm, 30 cm 450 cm — Diagram 11

[1 mark] (a)How far did the paper plane travel when the rubber band was stretched for 20 cm?

Show answerHide answer

310 cm1

Tick each point you got.

[1 mark] (b)How much farther did it travel with a 30 cm stretch than with a 10 cm stretch?

Show answerHide answer

270 cm (450 − 180 = 270)1

Tick each point you got.

[1 mark] (c)Predict the distance if the rubber band is stretched for 40 cm. Give a reason.

Show answerHide answer

More than 450 cm, because the distance increases as the stretch increases1

Tick each point you got.

For the teacher: Analysing, medium difficulty, standard 1.1.6

Textbook p. 7

Question 20

A pupil plans an investigation to find out if the quantity of water poured on a plant affects how tall the plant grows in one week.

[1 mark] (a)State the manipulated variable.

Show answerHide answer

Quantity of water1

Tick each point you got.

[1 mark] (b)State the responding variable.

Show answerHide answer

Height of the plant1

Tick each point you got.

[2 marks] (c)State two things you must keep the same.

Show answerHide answer

Any 2 points

Type of plant1
Amount of sunlight1
Type of soil1
Size of pot1
Starting height of the plant1

Tick each point you got.

For the teacher: Creating, high difficulty, standard 1.1.12

Textbook p. 8

Back to notes Unit 2 questions Model papers