Checkpoint Science Specimen Paper 2012

Topics: Sedimentary rock, Water, University of Cambridge Pages: 11 (1761 words) Published: August 26, 2012


For Examination from 2012 45 minutes

Candidates answer on the Question Paper. Additional Materials: Ruler

READ THESE INSTRUCTIONS FIRST Write your Centre number, candidate number and name on all the work you hand in. Write in dark blue or black pen. You may use a soft pencil for any diagrams, graphs or rough working. For Examiner's Use Do not use staples, paper clips, highlighters, glue or correction fluid. 1 Answer all questions. You should show all your working in the booklet. The number of marks is given in brackets [ ] at the end of each question or part question. The total number of marks for this paper is 50. 2 3 4 5 6 7 8 9 10 Total

This document consists of 15 printed pages and 1 blank page. [Turn over

© UCLES 2011

2 1 The diagram shows a plant cell.
For Examiner's Use




(a) Name the parts labelled A, B and C. A B C [3]

(b) Why are chloroplasts important to plants? [1]

(c) Name two structures present in a plant cell that are not present in an animal cell. and [2]

© UCLES 2011


3 2 The diagram shows a balloon containing air.
For Examiner's Use


(a) Explain how the air particles exert a pressure on the inside of the balloon.


(b) The air in the balloon is heated by leaving the balloon in a sunny place. State two effects this has on the air particles. 1 2 [2]

(c) State one way in which the balloon changes when it is left in a sunny place. [1]

© UCLES 2011


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4 3 Maya investigates the reaction between calcium carbonate and hydrochloric acid. She adds dilute hydrochloric acid to some calcium carbonate (marble chips), at room temperature. She collects the gas given off in a gas syringe. For Examiner's Use

dilute hydrochloric acid


calcium carbonate

(a) Suggest one safety hazard in this experiment. How can Maya reduce the risk from this hazard? hazard how to reduce the risk [2]

(b) Maya measures the volume of gas in the gas syringe every two minutes, until the reaction stops. The graph shows her results.

40 volume of gas / cm3 30 20 10 0 0 2 4 6 8 10 time / minutes What is the total volume of gas given off in the reaction? cm3 [1]

© UCLES 2011


5 (c) When the reaction stops, there is still some calcium carbonate in the bottom of the flask. (i) After how many minutes does the reaction stop? minutes (ii) Why does the reaction stop? Tick ( ) the correct box. The calcium carbonate has all reacted. [1] For Examiner's Use

The hydrochloric acid has all reacted.

The temperature has risen too high. [1] (d) Maya wants to find out if increasing the temperature increases the rate of the reaction. She repeats her experiment, but this time at a higher temperature. State two variables that Maya should keep the same in her experiment. 1 2 [2]

© UCLES 2011


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6 4 (a) A scientist sets up two experiments. In both experiments he has a torch, two pieces of card with holes in them and a screen. (i) The first experiment is shown in diagram 1. For Examiner's Use

card B card A holes


diagram 1 The scientist could see a spot of light on the screen. Draw the ray of light to show its path on diagram 1, after it has passed through the hole in card A. [1] (ii) The second experiment is shown in diagram 2.

card B holes card A


diagram 2 The hole in card B is not in line with the hole in card A. Draw the ray of light to show its path on diagram 2. (iii) Explain why the light is unable to reach the screen. [1]


© UCLES 2011


7 (b) A pinhole camera allows an image of an object to be projected onto a screen. screen
For Examiner's Use

object hole

Draw two rays of light, one from the bottom of the pencil and one from the top of the pencil, to show...
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