Cambridge IGCSE Physics 0625 — 2017 May/June Paper 5 · Variant 1

1 In this experiment, you will investigate the stretching of a spring. Carry out the following instructions, referring to Fig. 1.1. metre rule clamp boss spring stand bench Fig. 1.1 (not to scale) (a) • Do not remove the spring from the clamp. Use the metre rule to measure the length l0 of the coiled part of the spring. Record l0, in Table 1.1 at load L = 0.0 N. • On Fig. 1.1, show clearly the length l0. [1] (b) • Place a load L = 1.0 N on the spring. Record, in Table 1.1, the length l of the coiled part of the spring. • Repeat this procedure using loads L = 2.0 N, 3.0 N, 4.0 N and 5.0 N. Table 1.1 L / N 0.0 1.0 2.0 3.0 4.0 5.0 l / mm [2] (c) Describe one precaution that you took in order to obtain reliable readings. ................................................................................................................................................... ................................................................................................................................................... ...............................................................................................................................................[1] (d) Plot a graph of l / mm (y-axis) against L / N (x-axis). [4] (e) A student suggests that the length l of the spring is directly proportional to the load L. State whether your readings support this suggestion. Justify your answer by reference to the graph line. ................................................................................................................................................... ................................................................................................................................................... ...............................................................................................................................................[1] (f) Use your results to predict the load L that would give a length l twice the value of l0. Show clearly how you obtained your answer. load L = ...........................................................[2]

Mark scheme: 1(a) 1 1(b) Sensible value for l0 1 Remainder of values increasing 1 1(c) Use of set square to line up with scale OR perpendicular viewing Scale close to / touching spring 1 1(d) Graph: Axes correctly labelled and right way round 1 Suitable scales 1 All plots correct to ½ small square 1 Good line judgement, thin, continuous line 1 1(e) Expect NO. Line does not pass through origin 1 1(f) Use of 2 × l0 shown on graph 1 L correct to ½ small square 1 Total: 11

More questions on Physical quantities and measurement techniques

2 In this experiment, you will investigate the cooling of water. (a) Use the thermometer to measure room temperature θR. θR = ...........................................................[1] (b) • Pour 200 cm3 of hot water into the beaker. Place the thermometer in the beaker. • Measure the temperature θ of the hot water in the beaker. Record this temperature in Table 2.1 at time t = 0 s. • Immediately start the stopclock. • After 180 s, measure the temperature θ shown on the thermometer. Record the time and temperature in the table. • After a total of 360 s, measure the temperature θ shown on the thermometer. Record the time and temperature in the table. Table 2.1 t / s θ / °C 0 [4] (c) (i) • Calculate the temperature fall Δθ1 during the first 180 s. Δθ1 = ............................................................... • Calculate the temperature fall Δθ2 during the next 180 s. Δθ2 = ............................................................... [1] (ii) Suggest why Δθ1 is different from Δθ2. ........................................................................................................................................... .......................................................................................................................................[1] (d) Suggest two changes that you could make to the procedure to obtain a larger difference between the values of Δθ1 and Δθ2. 1. ............................................................................................................................................ 2. ............................................................................................................................................ [2] (e) Fig. 2.1 shows a measuring cylinder. A, B, C and D are four possible lines of sight that could be used to read the volume of the water. cm3 100 90 80 70 D 60 A B 50 C 40 30 water 20 10 Fig. 2.1 Give two reasons why B should be used to obtain the most accurate reading. 1. ............................................................................................................................................ ............................................................................................................................................ 2. ............................................................................................................................................ ............................................................................................................................................ [2] [Total: 11]

Mark scheme: 2(a) Sensible value for room temperature with unit °C 1 2(b) Correct times 1 Temperatures decreasing 1 First temperature difference greater than second 1 Consistent significant figures for temperatures in table 1 2(c)(i) Both temperature differences correct 1 2(c)(ii) Starting temperature closer to room temperature in the second case (or further from room temperature in the first case) 1 2(d) Two from: Increase draught over surface of water Increase temperature of hot water Increase surface area of water Longer time intervals Decrease room temperature Decrease volume of water Use metal can instead of glass beaker 2 2(e) Uses bottom of meniscus 1 Perpendicular to reading 1 Total: 11

More questions on Transfer of thermal energy

3 In this experiment, you will investigate the refraction of light passing through a transparent block. Carry out the following instructions, using the separate ray-trace sheet provided. You may refer to Fig. 3.1 for guidance. hole F N A B E M D C L ray-trace sheet eye Fig. 3.1 (a) • Place the transparent block, largest face down, on the ray-trace sheet supplied. The block should be approximately in the middle of the paper. Draw the outline of the block ABCD. • Remove the block and draw a normal NL at the centre of side AB. Label the point E where the normal crosses AB. Label the point M where the normal crosses CD. • Draw a line FE, to the left of the normal and at an angle of incidence i = 30° to the normal, as shown in Fig. 3.1. • Place two pins P1 and P2 on the line FE placing one pin close to point E. Label the positions of P1 and P2. • Replace the block and observe the images of P1 and P2 through side CD of the block so that the images of P1 and P2 appear one behind the other. Place two pins P3 and P4 between your eye and the block so that P3 and P4, and the images of P1 and P2 seen through the block, appear one behind the other. Label the positions of P3 and P4. • Remove the block. • Draw a line joining the positions of P3 and P4. Continue the line until it meets the normal NL and label this point K. [4] (b) • Measure and record the angle α between the line joining the positions of P3 and P4 and the line KL. α = ............................................................... • Measure and record the length x between points M and K. x = ............................................................... [2] (c) Repeat steps (a) and (b) with the angle of incidence i = 50°. α = ............................................................... x = ............................................................... [2] (d) A student suggests that the angle α should always be equal to the angle of incidence i. State whether your results support this suggestion. Justify your answer by reference to the readings. statement .................................................................................................................................. justification ................................................................................................................................ ................................................................................................................................................... [2] (e) Suggest one precaution that you should take with this experiment to obtain reliable results. ................................................................................................................................................... ................................................................................................................................................... ...............................................................................................................................................[1] [Total: 11] Tie your ray-trace sheet into this Question Paper between pages 6 and 7.

Mark scheme: 3(a) Ray-Trace: Normal in centre of AB and CD, on left, and FE at 30 ° ± 1 ° to normal 1 First P1 P2 distance at least 5 cm 1 P3 P4 line correctly drawn to K 1 All lines present in approximately correct positions and neat 1 3(b) α correctly measured to ± 2 ° 1 x correct to 2 mm 1 3(c) α values 28–32 and 48–52 1 Correct unit for x 1 3(d) Statement matches readings (Expect YES) 1 Justification to include the idea of within (or beyond, ecf) the limits of experimental accuracy 1 3(e) Any one from: Large pin separation Ensure pins vertical View bases of pins Use thin pencil lines / thin pins 1 Total: 11

More questions on Light

4 A student is investigating whether the resistance of a wire depends on the material from which the wire is made. V Resistance R is given by the equation R = . I The following apparatus is available to the student: ammeter voltmeter power supply (0–3 V) micrometer screw gauge variable resistor switch connecting leads wires made of different materials. Plan an experiment to investigate whether the resistance of a wire depends on the material from which the wire is made. You are not required to carry out this investigation. You should: • draw a diagram of the circuit you would use to determine the resistance of each wire • explain briefly how you would carry out the investigation, including the measurements you would take • state the key variables that you would control • draw a suitable table, with column headings, to show how you would display your readings (you are not required to enter any readings in the table). .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... ......................................................................................................................................................[7] [Total: 7]

Mark scheme: 4 MP1 Diagram showing power supply, ammeter, voltmeter and resistance wire correctly connected (variable resistor optional) 1 MP2 Correct symbols for ammeter and voltmeter. Variable resistor symbol correct if included. 1 MP3 Measure potential difference (voltage) and current and calculate resistance. 1 MP4 Repeat with other types of wire 1 MP5 Key variables length and diameter stated 1 MP6 One of: Repeat with different voltages (or currents). Repeat and take average of voltage and current readings. Repeat entire experiment with different length or different diameter. Use low current to prevent wire heating up. Keep temperature of wire constant. Use micrometer screw gauge to measure diameter / thickness of wire 1 MP7 Table with columns for type of wire, voltage, current, resistance with correct units (V, A and Ω) 1 Total: 7

More questions on Electric circuits