Physics 0625/62 May/June 2023: question paper and mark scheme

Question

A student investigates the stretching of a spring. Fig. 1.1 shows the set-up. spring metre ruler clamp stand bench Fig. 1.1 (a) The value l 0 is the length of the spring when the load L is 0.0 N. The student measures the length l 0 of the spring. She records l 0 = 16 mm in Table 1.1. Draw a diagram of the spring to show clearly the length l 0 of the spring. [1] (b) The student suspends a load L = 0.20 N from the spring. She records the new length l of the spring in Table 1.1. She repeats the procedure using loads L = 0.40 N, 0.60 N, 0.80 N and 1.00 N. The readings are shown in Table 1.1. (i) Calculate the extension e of the spring for each load using the equation e = (l – l 0). Record the values of e in Table 1.1. [2] (ii) Complete the column headings in Table 1.1. Table 1.1 L/ l/ e/ 0.00 16 0 0.20 18 0.40 21 0.60 23 0.80 24 1.00 26 [1] (c) Plot a graph of L (y-axis) against e (x-axis). Draw the best-fit line. [4] (d) Use the graph to determine eA, the extension produced by a load of 0.50 N. Show clearly on the graph how you obtained the necessary information. eA = …… [3] [Total: 11]

Question

A student investigates the cooling of water. Fig. 2.1 shows the set-up. thermometer lid bench beaker Fig. 2.1 (a) The thermometer in Fig. 2.2 shows the room temperature θR at the beginning of the experiment. Record θR. –10 0 10 20 30 40 50 60 70 80 90 100 110 °C Fig. 2.2 θR = …… [1] (b) The student pours 200 cm3 of hot water into a beaker. He places a lid on the beaker. He places the thermometer in the hot water in the beaker. He records, in Table 2.1, the temperature θ of the hot water at time t = 0. He immediately starts a stop-watch. He continues recording the temperature in Table 2.1 at 30 s intervals until he has seven sets of readings. (i) Complete the column headings in Table 2.1. [1] (ii) Write the times in the first column of Table 2.1. Table 2.1 t/ θ/ 92 87 83 80 78 76 75 [1] (c) (i) Calculate the decrease in temperature Δθ between t = 0 and t = 180 s. Δθ = …… [1] Δθ (ii) Calculate the average rate of cooling R of the water using the equation R = , Δt where Δt = 180 s. Include the unit. R = …… [2] (d) A student states that the water cools slowly. Suggest two changes to the experiment that the student makes to increase the rate of cooling of the hot water without changing the starting temperature of the hot water. Room temperature remains constant. 1 …… 2 …… [2] (e) State one precaution that you would take to obtain accurate temperature readings. Explain briefly the reason for this precaution. statement …… explanation …… …… [2] (f) The student uses a measuring cylinder to measure 200 cm3 of water. He takes the reading from the bottom of the meniscus. Explain the reason for taking the reading at the bottom of the meniscus rather than at the top of the meniscus. …… [1] [Total: 11]

Question

A student investigates the refraction of light using a semicircular transparent block. Fig. 3.1 shows her ray-trace sheet. eye P4 P3 A B P Q Fig. 3.1 (a) (i) • Draw a normal NL through the centre of AB. • Continue the normal so that it passes through the curved side of the block. • Label the normal NL. • Label the point C where the normal NL crosses AB. [1] (ii) • Draw a line DC, below line PC, at an angle i = 20° to the normal and to the left of the normal. [1] (iii) • Mark with neat crosses (X) the positions for two pins on line DC at a suitable distance apart for this type of ray-trace experiment. • Label the positions P1 and P2. [1] (b) The student looks from the position of the eye shown in Fig. 3.1, to observe the images of P1 and P2 through side AB of the block. She adjusts her line of sight until the images of P1 and P2 appear one behind the other. She places two pins, P3 and P4, between her eye and the block so that P3, P4, and the images of P1 and P2 seen through the block, appear one behind the other. The positions of P3 and P4 are shown in Fig. 3.1. (i) • Draw a line joining the positions of P3 and P4. Continue the line to AB. • Label E, the end of the line furthest from AB. [1] (ii) Measure the acute angle θ between the line NL and the line EC. (An acute angle is less than 90°.) θ = …… [2] (c) State one precaution that the student takes to produce an accurate ray trace. …… [1] (d) The student replaces the transparent block on the ray-trace sheet in the position shown in Fig. 3.2. A C B P Q P5 P6 Fig. 3.2 She replaces pins P1 and P2 on line DC in the same positions used in (a)(iii). She observes the images of P1 and P2 through the curved side of the block. She adjusts her line of sight until the images of P1 and P2 appear one behind the other. She places two pins, P5 and P6, between her eye and the block so that P5, P6, and the images of P1 and P2 seen through the block, appear one behind the other. The positions of P5 and P6 are shown on Fig. 3.2. (i) • Draw a line joining the positions of P5 and P6. Continue the line to C. • Label G, the end of the line furthest from AB. Measure the acute angle α between the line AB and the line GC. (An acute angle is less than 90°.) α = …… [1] (ii) Calculate the angle β between the line GC and the normal NL. β = …… [1] (e) A student suggests that angle β should be equal to the angle of incidence i = 20°. State whether your result supports the suggestion and justify your answer. statement …… justification …… …… [2] [Total: 11]

Question

A student investigates the change in current in a conducting liquid as the distance between two electrodes is changed. The circuit is shown in Fig. 4.1. A electrodes Fig. 4.1 Plan an experiment to investigate the change in current in the liquid as the distance between the electrodes is changed. You should: • explain briefly how to do the investigation • state the key variables to keep constant • draw a table, or tables, with column headings, to show how to display your readings (you are not required to enter any readings in the table) • explain how to use your readings to reach a conclusion. …… [7]