Physics 0625/62 October/November 2023: question paper and mark scheme

Question

A student investigates the period of a pendulum. Fig. 1.1 shows the set-up. clamp d bob Fig. 1.1 (a) The distance d is measured from the bottom of the clamp to the centre of the bob. The student adjusts the length of the pendulum until d = 50.0 cm. He displaces the bob slightly and releases it so that it swings. He uses a stop-watch to measure the time t for 10 complete oscillations. min sec 1/100th 00 : 14 21 Fig. 1.2 (i) Fig. 1.2 shows the reading on the stop-watch. Record, in Table 1.1, the time t for 10 complete oscillations. [1] (ii) Calculate and record in Table 1.1, the period T of the pendulum. The period is the time for one complete oscillation. [1] (iii) Calculate T 2 and record your value in Table 1.1. [1] (iv) Write the units in the column headings. [2] Table 1.1 d/ t/ T/ T2 / 50.0 100.0 20.20 2.02 4.08 (b) The student repeats the procedure in (a) using d = 100.0 cm. The readings and results are shown in Table 1.1. Another student suggests that T 2 is directly proportional to d. Explain briefly how to test the suggestion using the results in Table 1.1. …… [2] (c) The procedure can be repeated to plot a graph. Suggest additional values of d that are suitable for the experiment. …… [1] (d) Explain how you would measure the distance d as accurately as possible. Draw a diagram to help your explanation. …… [2] (e) Explain why timing 10 oscillations gives a more accurate result for the period T than timing one oscillation. …… [1] [Total: 11]

Question

A student investigates the resistance of a wire. Fig. 2.1 shows the circuit used. A l B C V resistance wire sliding contact S Fig. 2.1 (a) The student places a sliding contact S at a distance l = 40.0 cm from B. She measures the potential difference (p.d.) V across the length l of the resistance wire. She measures the current I in the circuit. The meters are shown in Fig. 2.2 and Fig. 2.3. 2 3 0.4 0.6 1 4 0.2 0.8 0 5 0 1.0 V A Fig. 2.2 Fig. 2.3 (i) Write down the current I. I = …… [1] (ii) Record the potential difference V reading in the first row of Table 2.1. [1] (b) The student repeats the procedure in (a) using l = 50.0 cm, 60.0 cm, 70.0 cm and 80.0 cm. The readings are shown in Table 2.1. (i) Calculate, and record in Table 2.1, the values of resistance R using the equation V R= . I [2] (ii) Complete the column headings in Table 2.1. [1] Table 2.1 l/ V/ R/ 40.0 50.0 1.5 60.0 1.8 70.0 2.1 80.0 2.4 (c) Plot a graph of R (y-axis) against V (x-axis). Start both axes at the origin (0,0). Draw the best-fit line. 0 0 [4] (d) Determine the gradient G of the graph. Show clearly on the graph how you obtained the necessary information. G = …… [2] [Total: 11]

Question

A student investigates the cooling of water under different conditions. Fig. 3.1 shows the set-up. thermometer beaker bench Fig. 3.1 (a) The thermometer in Fig. 3.2 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. 3.2 θR = …… [1] (b) The student pours 200 cm3 of hot water into the beaker. He places the thermometer in the water. He records the temperature θ of the hot water at time t = 0. He immediately starts a stop-watch. He records the temperature at 30 s intervals. The temperature readings are shown in Table 3.1. (i) Write the times in the first column of Table 3.1. [1] (ii) Complete the column headings in Table 3.1. Table 3.1 t/ θ/ 95 86 78 72 68 66 65 [1] (c) (i) Calculate the decrease in temperature Δθ1 between time t = 0 and time t = 90 s. Δθ1 = …… [1] (ii) Calculate the difference in temperature ΔθS between the temperature at time t = 0 and room temperature θR. ΔθS = …… [1] (iii) Calculate the decrease in temperature Δθ2 between time t = 90 s and time t = 180 s. Δθ2 = …… Calculate the difference in temperature ΔθT between the temperature at time t = 90 s and room temperature θR. ΔθT = …… [1] (d) A student suggests that the decrease in temperature of the water in 90 s should be greater when the starting temperature is greater. (i) State whether the results agree with this suggestion. Justify your statement by reference to the results. statement …… justification …… [2] (ii) Suggest how you would continue the experiment, using the same apparatus and method, to investigate the suggestion. …… [2] (e) Refer to Table 3.1. Estimate the temperature of the water in the beaker after cooling for a further 90 s. …… [1] [Total: 11]

Question

A student investigates the effect of changing the colour of light on the focal length of a lens. uv The focal length f of a lens is given by the equation f = . (u + v) The distance u is the distance between an object and the lens. The distance v is the distance between the lens and the image that is formed on a screen. Plan an experiment to investigate the effect of changing the colour of light on the focal length of a lens. The following apparatus is available to the student: • illuminated object • a selection of coloured filters to change the colour of the light • converging lens • screen • metre ruler. Other apparatus normally available in a school laboratory can also be used. In your plan, you should: • draw a labelled diagram to show the arrangement of the apparatus • explain briefly how you would do the investigation, including the measurements you would take • 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) • state how you would use your results to reach a conclusion. …… [7]