Physics 0625/51 October/November 2023: question paper and mark scheme

Question

In this experiment, you will determine the weight of a metre ruler using a balancing method. Carry out the following instructions, referring to Fig. 1.1. P metre rule a b 90.0 cm pivot bench Fig. 1.1 (a) • Place the metre ruler on the pivot. • Place the load P on the metre ruler with its centre at the 90.0 cm mark. • Keeping P at the 90.0 cm mark, adjust the position of the metre ruler on the pivot so that the metre ruler is as near as possible to being balanced. Calculate, and record in the first row of Table 1.1, the distance a from the 90.0 cm mark to the pivot. Calculate, and record in the first row of Table 1.1, the distance b from the pivot to the 0.0 cm end of the metre ruler. Repeat the steps above, placing the load P at the 85.0 cm mark, 80.0 cm mark, 75.0 cm mark and 70.0 cm mark. Record the values of a and b in Table 1.1. Table 1.1 a / cm b / cm [3] (b) Plot a graph of a / cm (y-axis) against b / cm (x-axis). Start the y-axis at a = 0.0 cm. Start the x-axis at a suitable value for your results. Draw the best-fit line. [4] (c) Determine the gradient G of the graph. Show clearly on the graph how you obtained the necessary information. G = …… [2] (d) The weight W of the metre ruler is numerically equal to 2G. Calculate the weight W of the metre ruler. W = …… [1] (e) Suggest one practical reason why it is difficult to obtain accurate readings for a and b. …… [1] [Total: 11]

Question

In this experiment, you will investigate the resistance of a resistance wire. Carry out the following instructions, referring to Fig. 2.1. A l B sliding resistance wire contact C V Fig. 2.1 (a) (i) Close the switch. Measure the current I in the circuit. I = …… [2] (ii) Place the sliding contact C at a distance l = 20.0 cm from B. Measure, and record in Table 2.1, the potential difference (p.d.) V across length l of the resistance wire. Calculate, and record in Table 2.1, the resistance R of 20.0 cm of the resistance wire. V Use the equation R = . I Repeat the procedure using l = 60.0 cm and l = 100.0 cm. Open the switch. [2] R (iii) Calculate, and record in Table 2.1, for each value of l. [1] l (iv) Complete the column headings in Table 2.1. Table 2.1 R l/ V/ R/ / l 20.0 60.0 100.0 [2] R (b) Look carefully at the values of in Table 2.1. l (i) Write a conclusion about the relationship between R and l. …… [1] (ii) Justify your conclusion by reference to your results. …… [1] (c) Use the values in Table 2.1 to estimate the resistance R2 of 2.000 m of the resistance wire. Show your working. R2 = …… [2] [Total: 11]

Question

In this experiment, you will investigate the magnification of the image produced by a lens. Carry out the following instructions, referring to Fig. 3.1 and Fig. 3.2. illuminated object u v screen lens bench Fig. 3.1 hO Fig. 3.2 (not to scale) (a) Measure the height hO of the illuminated object provided. Fig. 3.2 shows the height to be measured on your object. hO = …… [2] (b) • Place the lens a distance u = 20.0 cm from the illuminated object. • Move the screen slowly until a clearly focused image is formed on the screen. • Measure the distance v between the centre of the lens and the screen. • Record v in Table 3.1. v • Calculate, and record in Table 3.1, the magnification m using the equation m = u . • Measure, and record in Table 3.1, the height of the image hI formed on the screen. h • Calculate, and record in Table 3.1, the ratio I , where hO is the height of the object recorded in (a). hO • Repeat the procedure using u = 30.0 cm. Table 3.1 hI u / cm v / cm m hI / cm hO 20.0 30.0 [5] h (c) A student suggests that the magnification m is equal to the ratio I . hO (i) State whether your results agree with the suggestion. Justify your statement by reference to your results. statement …… justification …… [2] (ii) Suggest how you would continue to use the same apparatus to test the suggestion that h the magnification m is equal to the ratio I . hO …… [2] [Total: 11]

Question

A student investigates the time taken for water to evaporate to dryness when heated from above. Fig. 4.1 shows the set-up. The power of the heater is constant. The following is also available: • supply of water at room temperature • metre ruler. infrared heater lead to power supply shallow dish water Fig. 4.1 Plan an experiment to investigate how one factor affects the time taken for the water to evaporate. You are not required to do this investigation. You do not need to write about safety precautions. You should: • state any additional apparatus required • explain briefly how you would do the investigation • state the key variables that you would keep constant • draw a table, or tables, with column headings, to show how you would display your readings (you are not required to enter any readings in the table) • explain how you would use your readings to reach a conclusion. …… [7]