KS3 Science Practise Test

Transcription

1 KS3 Science Practise Test Name: Class: Date: Time: 40 minutes Marks: 54 marks Comments:

2 Q1. Tea bags are made in different shapes. triangle square circle Some pupils want to find out which shape of tea bag lets tea dissolve most quickly. They make two plans for their investigation as shown below. FIRST PLAN We will use 3 tea bags and 3 beakers SECOND PLAN Collect three beakers. Collect three different tea bags. Put one tea bag in each beaker. Add 150 cm 3 of water at 65 C. Keep the temperature of the water the same. Measure the time taken for the tea to dissolve. Find out which is the quickest for making tea. (a) How is the second plan better than the first plan? (b) Why should they take care when they add hot water at 65 C to the tea bags? (c) Ben and Vicky drew a cross on some paper. They put each beaker, in turn, over the cross. They poured hot water into the beaker, dropped in the tea bag and watched the water change colour.

3 To see which shape of tea bag let the tea dissolve the quickest, they measured the time until the liquid was too dark for them to see the cross. How did the cross help to make their test more accurate?... (d) (i) They recorded their measurements in a table as shown below. shape of tea bag time taken until cross cannot be seen (minutes) triangle 8 square 15 circle 10 Which part of their investigation was recorded in the table? Tick the correct box. explanations results conclusions plans (ii) Give the three shapes of tea bags in the order in which the tea dissolved. Use the table above to help you. quickest slowest maximum 5 marks

4 Q2. Yasmin investigated the stopping distance of a trolley. (a) Yasmin did the investigation five times. She changed the steepness of the ramp each time. (i) How could she make this ramp steeper? (ii) Yasmin s results are shown in the table. steepness of ramp stopping distance (cm) A 10 B 16 C 16 D 28 E 34 She predicted, The steeper the ramp, the greater the stopping distance. If Yasmin was correct, which ramp was the steepest? Write the letter....

5 (iii) Yasmin looked at her results and decided she should repeat her investigation. Look at Yasmin s results. Suggest why she decided to repeat her investigation.... (b) Yasmin then investigated the stopping distance of a trolley with different masses on it. The graph shows her results. (i) What would be the stopping distance if 0 g were on the trolley?... cm (ii) Complete the sentence with decreases, increases or stays the same. As the mass added to the trolley increases, the stopping distance.... maximum 5 marks

6 Q3. Ellie has a set of scales and some weights as shown below. Ellie puts two weights in pan X and one weight in pan Y. The scales balance. (a) Which weights could be in pans X and Y? pan X:... and... pan Y:... (b) Ellie removes all the weights from the scales. She then puts a cup on pan X. In which direction will pan Y move?... (c) She puts weights into pan Y so the scales balance. How much does the cup weigh?... N

7 (d) Ellie puts some water in the cup. She then adds some more weights to pan Y to make the scales balance. (i) How much do the cup and water weigh?... N (ii) How much does the water weigh?... N maximum 5 marks

8 Q4. Alan and Aysha saw a poster claiming that Glossy washing-up liquid makes more bubbles than other washing-up liquids. They investigated the amount of bubbles three different washing-up liquids made. They added each type of washing-up liquid to water in a test-tube and shook it. (a) What would they see if the results of their test supported the claim made on the poster?... (b) Why should they use the same volume of washing-up liquid in each test-tube?... (c) The first time they tried this investigation all the washing-up liquids made bubbles which went to the tops of the test-tubes. Why was this a problem?...

9 (d) Jane tried the investigation again using less washing-up liquid in each test-tube. She made a prediction about Shine washing-up liquid. The photograph shows her results. Jane s results support her prediction about Shine. What was Jane's prediction?... Maximum 4 marks

10 Q5. Simon made two candles from the same amount of wax. He drew lines on both candles. (a) What would Simon use to measure the distance between the lines?... (b) He timed how long candle 1 took to burn. His results are shown below. (i) How long would it take for candle 1 to burn from C to D? Write your answer in the table. part that burned time for candle 1 to burn (minutes) A to B 30 B to C 30 C to D D to E 30

11 (ii) Simon timed how long candle 2 took to burn. How long would it take for candle 2 to burn from A to B and from D to E? Write your answers in the table. part that burned time for candle 2 to burn (minutes) A to B B to C 20 C to D 40 D to E 2 marks (c) Simon wanted to use a candle to measure time. He made candle 3 the same size as candle 1. Why is candle 3 more useful than candle 1 for measuring time? maximum 5 marks

12 Q6. Some pupils visited a deer park. A poster showed different types of deer. Red deer adult male adult female young Fallow deer Roe deer (a) Emily said, I saw a male deer. Look at the drawings in the poster. How would Emily know that the deer was male?......

13 (b) Jimmy made some notes about a young deer. Give one reason why he cannot identify the type of young deer from his notes.... (c) Dan drew one of the deer. He said it was an adult male red deer. Give two pieces of evidence from his drawing which suggest that he got the name wrong

14 (d) Michael saw a deer like this. What two pieces of evidence show it was not one of the deer on the poster? maximum 6 marks

15 Q7. Jack and Aneesa dropped a steel ball into trays of damp sand. They measured the depth of the craters made by the steel ball. not to scale Their results are shown in the table below. height the ball was dropped from (cm) depth of crater (cm) Jack s results Aneesa s results (a) Use information in the table to answer the questions below. (i) What was the independent variable that Jack and Aneesa changed in their investigation?... (ii) Why was Jack s investigation better than Aneesa s?...

16 (b) Look at the results in the table. What is the relationship between the height the ball was dropped from and the depth of the crater? (c) Aneesa said that they made sure the investigation was fair. Suggest two variables they must have kept the same to make their investigation fair marks (d) (i) Jack removed the steel ball using his fingers. Then he measured the depth of the crater. Aneesa said he should use a magnet instead of his fingers. Explain why using a magnet to remove the ball would improve the investigation (ii) Jack said that the ball could be dropped using an electromagnet instead of dropping it by hand. Explain why this would improve the investigation maximum 7 marks

17 Q8. Some pupils predicted that water will evaporate faster if the surrounding air temperature is higher. To investigate their prediction they placed some water in containers in two different rooms. (a) Give two factors they should keep the same to make their investigation fair (b) They recorded the mass of the water and the container in room 1 and room 2 every day for 5 days. The table below shows their results. time (days) mass of water and container (g) room 1 room The data shown in their table is not sufficient to test their prediction. Explain why

18 They plotted their data for room 2 and attempted to draw a line of best fit. (c) Describe the mistake they made in drawing the line of best fit (d) Using the data in the table plot the points for room 1. (e) (f) Draw a line of best fit of the points you have drawn. In which room did the water evaporate more quickly? Tick one box. room 1 room 2 Use their data to explain your answer maximum 7 marks

19 Q9. A company that sells bottled water claims in its advertisement: Tap water contains large clusters of molecules. These are too large to pass through the tiny channels in the cell membranes that allow water into the cells of our bodies. Our special process makes the clusters of water molecules small enough to pass through the tiny channels. A scientist says: Water is absorbed by cells one molecule at a time so the size of the clusters of molecules does not matter. (a) What claim made by the company is the scientist challenging? (b) Explain why it is more difficult to compare any effects of drinking water on feeling more beautiful than on blood pressure (c) Consumers called for an 'independent study of the company s claims. Why is it important that any future study is 'independent of the company?......

20 (d) Any study of the effects of different types of water should be done with people who do not know which type of water they are drinking. Give a reason for this maximum 4 marks

21 Q10. Oliver clamped a wooden plank to a desk. There was a 40 cm overhang as shown in diagram 1. Oliver added masses to the end of the wooden plank as shown in diagram 2. He measured the sag. The graph below shows his results. (a) What measurements would Oliver need to take to work out the sag?......

22 (b) Oliver repeated his test with a new plank with an 80 cm overhang. His results are shown below. mass (g) sag (cm) (i) (ii) Plot the results from Oliver s second test on the grid above. Use the points to draw a line of best fit. In the second test the plank sagged with no mass added to it. Explain what caused this sag marks (c) Compare the results of Oliver s two tests. (i) How are the results similar for each test? (ii) How are the results different in the second test? maximum 6 marks

23 Mark schemes Q1. (a) any one from it describes how they will carry out their investigation it has more information or detail it includes a fair test (b) (c) it includes measurement accept a description which identifies a factor to be kept constant accept the second plan includes apparatus to be used or a measurement or a comparison accept the converse of any marking point accept a statement referring to any of the points in the second plan accept answers which describe a consequence of the test not being fair to avoid scalding or burning themselves accept it is very hot accept to avoid spilling credit may be given for answers which, although not accurate, imply that the water is at a high temperature eg it is nearly boiling any one from it allowed them to compare the times for different tea bags it told them when the measurement was completed so they knew when to stop accept as soon as it has gone they stopped timing accept so they know how long it takes accept the cross let them see when the tea produced by the 3 bags was the same accept so they could stop at the right time accept it tells them when they have dissolved the same answers must indicate that the cross shows when the teas are the same colour or allows a measurement to be made it made it fair is insufficient 1 (L4) 1 (L4) 1 (L3) (d) (i) results if more than one box is ticked, award no mark 1 (L4)

24 (ii) triangle circle square accept a drawing of a triangle, a circle and a square all three answers are required in the correct order 1 (L3) [5] Q2. (a) (i) any one from add more books accept use bigger books change the number of books or change the size of the books are insufficient (ii) E make the pile of books higher accept lift one end of the ramp higher lift the ramp higher is insufficient accept bring the ramp closer to the books do not award a mark for answers implying the use of a different ramp 1 (L3) 1 (L3) (iii) any one from some results are the same accept there are two 16s do not accept 34 (b) (i) 26 cm some results do not fit the pattern accept to check her results accept to make it more reliable accept in case one was an odd result because there was no pattern is insufficient do not accept to make it a fair test (ii) increases accept goes up 1 (L4) 1 (L3) 1 (L3) [5] Q3. (a) either pan X: 1N and 1N pan Y: 2N or

25 pan X: 4N and 1N pan Y: 5N three weights are required for the mark units are not required for the mark the weights in pan X can be in either order 1 (L3) (b) up (c) 3 N accept X will go down is insufficient 1 (L3) 1 (L3) (d) (i) 8 N (ii) 5 N accept the answer to (di) minus the answer to (c) accept (L3) 1 (L4) [5] Q4. (a) (b) (c) Glossy or it would have more or higher bubbles than the others accept more bubbles do not accept lots of bubbles any one from to make the test fair accept it is a controlled experiment if they use different amounts it will be unfair any one from they could not compare the amounts of bubbles they could not compare them they could not tell which was better they could not tell the difference they could not know which made the most bubbles accept they were all the same do not accept the bubbles all went to the top do not accept they could not see how many bubbles there were accept an appropriate practical problem which would prevent the collection of valid results such as the bung stops the bubbles or the test- tubes are not long enough 1 (L4) 1 (L3)

26 or they used too much washing- up liquid 1 (L4) (d) any one from Shine will have most bubbles accept Shine made the most bubbles Shine will make most froth accept Shine would produce more bubbles than glossy 1 (L4) [4] Q5. (a) a ruler accept a metre rule accept a tape measure cm is insufficient a measuring stick is insufficient 1 (L3) (b) (i) 30 do not accept 30 seconds (ii) A to B: any number from 5 to 15 accept a range such as 5 to 10 D to E: any number from 45 to 80 accept a range such as 50 to 60 1 (L3) 1 (L4) 1 (L4) (c) any one from you can measure smaller intervals of time accept each section burns for a shorter time accept it is more precise or accurate it is easier to read is insufficient the lines are closer accept the lines are close accept the lines are further apart on candle 1 accept the lines are 1 cm apart on candle 1 and 0.5 cm apart on candle 3 accept there are more lines or smaller spaces or smaller segments accept more sections or rings the lines are smaller is insufficient 1 (L4) [5] Q6. (a) a male has antlers accept the males have horns ; it was bigger than others accept it has a beard or hair around the neck

27 (b) (c) (d) they all have these characteristics accept all deer have these things ; all young deer look the same ; they all have spots or skinny legs ; an adult fallow deer has spots an adult female has spots is insufficient any two from (adult) red deer does not have spots accept the converse accept the spots the shape of the antlers or horns accept the things on its head are too wide the red deer has hair round its neck accept the red deer is hairy it looks like a fallow deer or it is a fallow deer are insufficient any two from beard or hair under neck accept too hairy ; different kind of fur the shape of the antlers accept the shape of the horns ; horns 1 (L3) 1 (L4) 2 (L4) rounder nose accept it has more than two antlers ; the head or face is a different shape or size ; the face looks different ; bigger feet or different hooves do not accept it has a hump 2 (L4) [6] Q7. (a) (i) the height the ball was dropped from accept height do not accept depth accept height in cm cm is insufficient 1 (L5) (ii) any one from he repeated it accept he got more results accept he did it twice

28 it was a fair test is insufficient he could get an average accept he would notice odd results it was more reliable accept more accurate (b) the greater the height, the deeper the crater accept the converse accept there is a positive correlation (between the variables) accept bigger for deeper only when it refers to the crater size a comparative answer is required for the mark when the ball was dropped from a high height, a larger crater formed is insufficient the bigger, the deeper is insufficient as bigger is ambiguous 1 (L5) 1 (L5) (c) any two from (use the same) ball accept the size or mass or weight or volume or material of the ball do not accept density of ball depth of sand accept same amount of sand or the (same) sand the conditions of the sand accept how damp the sand was or the type of sand accept how flat the sand surface is the sand tray is insufficient where or how the depth is measured accept keep the ruler in the same position use the same ruler is insufficient the way the ball is released accept release the ball with the same force same person is insufficient (d) (i) there is less disturbance to the sand accept he might push the ball further in accept your finger could push it further in, but the magnet lifts it it would be more accurate is insufficient accept it lifts the ball out cleanly it lifts the ball out is insufficient 2 (L5) 1 (L5) (ii) any one from

29 less chance of human error accept the ball would fall the same way each time do not accept there is less chance of something going wrong the electromagnet would drop it cleanly accept the ball would not be dropped differently it lands in the same place is insufficient accept it drops at the same angle it is easier to adjust height is insufficient accept the ball would be released from the same height each time the height would be more accurate it is more accurate is insufficient so it is a fair test is insufficient accept they could push the ball (slightly) if they use their hands do not accept he can change the force of the electromagnet it stays steady is insufficient 1 (L6) [7] Q8. (a) any two from initial temperature of water exclusion of draughts accept same amount of draughts volume or mass of water accept amount of water surface area (of water) accept shape or size or material of container humidity accept the time it is left for temperature is insufficient do not accept size of room 2 (L5) (b) they have not collected data about temperature accept they did not measure temperature no data recorded about temperature accept no information about temperature accept no temperature 1 (L5) (c) the line is not straight (converse) the line should be straight accept the line is zig-zag accept they joined up all the points

30 (d) (e) (f) accept they didn t go between the points accept the line does not need to go through all the points 6 points correctly plotted to the nearest half square a straight line of best fit between some of the points 1 (L6) 1 (L6) 1 (L6) and the points for room 2 are lower than room 1 the container in room 2 reaches 30g in 5 days, room 1 reaches 45g accept there is less water in the container in room 2 than in room 1 more water evaporated in the same time accept amount of water dropped more in the first three days accept the line for room 2 is steeper the volume goes down more quickly accept the numbers go down more quickly accept the mass goes down more quickly 1 (L6) [7] Q9. (a) that water enters the cells in clusters of water molecules accept that clusters of water molecules are too big to enter the cells accept the size of the clusters matters accept small clusters are more efficient accept only their water would be absorbed by the cells do not accept tap water molecules are too large to be absorbed by the body do not accept the size of the clusters does not matter 1 (L7) (b) any one from beauty cannot be measured accept beauty is difficult to measure or judge or compare accept feeling beautiful is subjective or an opinion blood pressure can be measured 1 (L7) (c) any one from so that judgement was not biased

31 accept so the company cannot rig the results accept so you can trust it to avoid influencing the outcome to avoid influencing the researchers bribing is insufficient biased to make it fair is insufficient 1 (L7) (d) any one from if they believe there is a benefit they may report feeling better so that they cannot prejudge the results to get a more objective opinion to prevent bias accept so they cannot lie accept so they do not just say what they believe about different types of water to make it fair is insufficient 1 (L7) [4] Q10. (a) any one from the original height of the plank and the height with masses accept take the height with the mass added away from the height of the table the height of the plank before and after adding masses accept take the height of the plank with the mass added away from the height with no mass accept vertical distance moved distance moved is insufficient (b) (i) five points plotted to within one small square 1 (L7) 1 (L7) smooth curve of best fit

32 accept an appropriate straight line of best fit 1 (L7) (ii) any one from the weight or mass of the (wooden) plank the weight or mass is insufficient the (larger) overhang (c) (i) as the mass increases the sag increases accept the converse accept the lines both went up accept sag increases in both 1 (L7) 1 (L7) (ii) any one from there is more sag for each mass accept the plank sags more the increase in sag is not constant accept in the second test they did not go up in equal amounts the increase in sag gets less accept first test gives a straight line, the second was a curve accept first went up gradually, the second went up steeply the plank sagged before he added any mass is insufficient 1 (L7) [6]