PRAIRIEWOOD HIGH SCHOOL

SCIENCE YEAR 7 - SELECTIVE

ASSESSMENT TASK 1

2020 Time allowed – 45 minutes (includes reading time)

NAME …………………………………… CLASS: ………………

TEACHER …………………...........……. TOTAL MARK …………/50

Questions 1-10 (1 mark each)

Write the correct answer A, B, C or D in the table below

Question number 1 2 3 4 5 6 7 8 9 10

Answer (A, B, C or D)

1. What is the best way for you to work safely in your school laboratory?

A. Avoid performing practical activities. B. Carefully following the teacher’s instructions. C. Only use the safety flame on the Bunsen burner. D. Watch videos of experiments done by professional scientists.

2. What is the correct sequence of actions to safely light a Bunsen burner?

A. Collect safety glasses, connect the gas tap, open the collar, strike the match, and then turn on the gas tap.

B. Collect safety glasses, connect the gas tap, close the collar, strike the match, and then turn on the gas tap.

C. Connect the gas tap, turn on the gas tap, close the collar and then strike the match D. Connect the gas tap, turn on the gas tap, open the collar and then strike the match.

3. In the event a chemical spill (such as an acid or base gets into your eyes or on your skin), what

should you do?

A. Immediately rinse affected area in running water for 15 minutes and get a cold shower if needed

B. Report to Public Safety C. Run to get health services D. Wipe the spill off with a clean cloth

Read the following information to answer questions 4 and 5.

In an experiment to test parachutes, different sizes, materials and drop heights were used, and the time to fall recorded. In a fair experiment only one factor is changed (independent variable) and all other factors are kept the same (controlled variables.)

4. To test what effect drop height has, which of the following should be kept the same?

A. Size of the parachute. B. Drop Height. C. Time to Fall. D. All of the above.

5. The independent variable in the above experiment will be:

A. Drop height. B. Time to fall. C. Parachute size. D. Parachute material.

6. The white shark and its prehistoric ancestor, Megalodon, are drawn to the same scale in the

following diagram. The white shark is 5 meters long.

Approximately how long was the Megalodon?

A. 11.0 m B. 12.5 m C. 13.5 m D. 17.0 m

7. What lab equipment is used to accurately measure the volume of liquids?

A. 250 mL beaker B. Test tube C. Graduated cylinder D. Conical flask

8. A thermometer is used to measure temperature in degrees Celsius (°C). The thermometers used in most school laboratories contain alcohol with a red dye added. The reading on thermometers A and B are:

ANSWER A (0 C) B (0 C) A 35.8 26.0 B 38.0 23.4 C 39.0 23.5 D 39.0 23.6

9. This piece of equipment is used to heat substances in test tubes and beakers in most school science laboratories.

A. a lighted match B. a Bunsen burner C. a blowtorch D. a large candle

10. Safety symbols, hazard symbols or safety labels are meaningful and recognizable graphical symbols that warn of or identify hazards associated with the location or item. The symbol below represents:

A. Corrosive B. Explosive C. Flammable D. Toxic

QUESTION 11 (6 marks)

Use the word bank below to help you match the correct response to the meaning. There are more words than required for the responses. Word Bank inference conclusion graph results hypothesis observation

variable control data method investigation

MEANING WORD

1. a comparison so that a fair experiment is done

2. a project or experiment you do to answer a question

3. an explanation of what you observed

4. a guess at an answer you can check by experiment

5. another name for information

6. a way of showing information in a visual form

QUESTION 12 (4 marks)

When using a Bunsen burner, the air hole is sometimes open and sometimes closed. Complete the table below.

USE OF BUNSEN BURNER SHOULD AIRHOLE

BE OPEN OR

CLOSED?

COLOUR OF THE

FLAME IS IT NOISY (CAN

YOU HEAR SOUND)

YES/NO

Lighting it

Using it for heating

Turned on but not heating

QUESTION 13 (6 marks)

Read through the list below. Place a tick () in the space beside each sentence that you think is a hypothesis and a cross (X) beside each sentence that you think is not a hypothesis.

A. Food additives cause asthma attacks in some people. …………..

B. The label on the ice-cream states that it contains food additives. …………..

C. Birds prefer to feed in the morning. …………..

D. Sugar causes tooth decay. …………..

E. The plant that was not watered for two weeks died. …………..

F. Printed on cigarette packets are health warnings. …………..

QUESTION 14 (4 marks)

The procedure for drawing scientific diagrams is as follows: 1. Draw clearly and neatly. 2. Use a sharp pencil. 3. Draw the equipment from the side view. 4. Draw lines using a ruler. 5. Print labels neatly and connect them to the diagram with a line or arrow. 6. Diagrams should be at least 6 cm high.

A science student has set up the equipment required to boil water in a beaker. Draw this set up in the space provided below and label each piece of equipment used. Remember to follow the procedure for drawing scientific diagrams.

QUESTION 15 (4 marks)

Read the following information and complete the questions.

In science, we need to make a lot of careful observations. Observations are what we can say about things we see, hear, smell, taste and touch. We can also use measuring equipment to help us with observations. How would you describe a platypus to someone who had never seen one before? Some observations could be:

• It has a bill like a duck. • Its fur feels smooth. • The one we measured was 32 cm long.

1. List 2 other observations that could be used to describe the platypus. (2 marks)

……………………………………………………………………………………………………………

……………………………………………………………………………………………………………

When a platypus was first sent to Europe, the scientists who saw it thought the people in Australia were trying to play a trick on them. They believed the people in Australia had sown a duck’s beak on a beaver. They did not take the time to make good observations.

Some statements that are not observations are:

• It has a duck’s bill sown on to it. • It is a type of dog • It must be a marsupial • It probably is able to swim.

2. Explain why the statements ‘it probably is able to swim’ and ‘it is a type of dog’ are not

observations about the platypus? (2 marks) ………………………………………………………………………………………………………

………………………………………………………………………………………………………

………………………………………………………………………………………………………

QUESTION 16 (5 marks)

Five students went to sick bay in the afternoon all with stomach cramps. Each student had purchased their lunch from the school canteen. The school nurse asked each one to write down what they had eaten that day.

• Student 1 had eaten scrambled eggs with toast, a meat pie, an apple, a custard slice and a flavoured milkshake

• Student 2 had eaten a muesli bar, orange juice, a salad roll and a custard slice. • Student 3 had eaten custard slice, chicken sandwich, an apple and a can of Fanta. • Student 4 had eaten a chicken sandwich, a custard slice, a muesli bar and orange juice. • Student 5 had eaten scrambled eggs with toast, a muesli bar, a salad roll, a custard slice and a

flavoured milkshake.

1. The school nurse decided to tabulate the above information given to her by the five sick students. Complete the table below showing how the school nurse had presented the information. (4 marks)

FOOD EATEN STUDENT

1 STUDENT

2

Scrambled eggs with toast

2. What inference could the school nurse make about what caused the students stomach cramps? (1 mark)

3. 4. ………………………………………………………………………………………………………

………………………………………………………………………………………………………

QUESTION 17 (5 marks) Amanda observed that her father watered his daisies every day just like their neighbour, Mr Krandinski. However, she saw that Mr Krandinski’s daisies grew higher, thicker and had a lot more flowers than her father’s daisies.

Mark

(a) List TWO observations that Amanda could make. 2 ………………………………………………………………………………………………………

………………………………………………………………………………………………………

(b) Suggest one possible explanation for the differences in the daisy plants? 1 ………………………………………………………………………………………………………

………………………………………………………………………………………………………

(c) Write a suitable AIM for this experiment. 1 ………………………………………………………………………………………………………

………………………………………………………………………………………………………

(d) For a fair test between the daisies, list 2 variables that should be controlled in this experiment? 1 ………………………………………………………………………………………………………

………………………………………………………………………………………………………

QUESTION 18 (6 marks) Read the student report. MY REPORT

1. I obtained two aluminium cans. 2. I painted one white and the other can black. 3. I added the same amount of water to each can. 4. I placed each can in the sun at the same time for the same amount of time. 5. I used the same kind of thermometer to measure the temperature of the two cans. 6. I recorded the temperature of each can every 5 minutes in the table below.

TIME (minutes)

TEMPERATURE OF THE

BLACK CAN (°C)

TEMPERATURE OF THE

WHITE CAN (°C)

0 20 20 5 28 23

10 36 25 15 44 30 20 51 34 25 59 38 30 64 41

Answer the following questions about the experiment in the report. Mark

(a) State one thing that the student might change (or do extra) to make the experiment better. 1

………………………………………………………………………………………………………………

………………………………………………………………………………………………

(b) Write a suitable conclusion for this experiment. 1

………………………………………………………………………………………………………………

………………………………………………………………………………………………

(c) Plot the results of the black and white cans experiment on the graph below.

Use the plotted points to draw two line graphs.

4 marks

Time in minutes