Physics · 5054 · Paper 4 variant 25054/42/M/J/24
Start0 of 40 marks·0 of 24 parts attempted — start anywhere
- 1(a)Draw on Fig. 1.1 the symbol for a voltmeter connected to measure the potential difference across the diode.1 mark
- 1(b)The first row has X–Y resistance 0 Ω; its other entries are blank.2 marks
- 1(c)Using the V and I readings in the top row of Table 1.1, calculate the resistance R of the diode with R = V / I.2 marks
- 1(d)Complete the two missing values in Table 1.1.2 marks
- 1(e)(i)Describe how the change in current affects voltage across the diode.1 mark
- 1(e)(ii)Describe how the change in current affects resistance of the diode.1 mark
- 1(f)Suggest an assembly error.1 mark
- 2(a)Read Fig. 2.3 and enter the temperature in Table 2.1 at t = 0 s.1 mark
- 2(b)(i)Complete the units in the Table 2.1 headings: time t / , temperature θ / for a test-tube cooling in cold water, and temperature θ / for a test-tube cooling in warm water.1 mark
- 2(b)(ii)Complete the seven-entry time column of Table 2.1, beginning at t = 0 s.1 mark
- 2(c)For the arrangement in Fig. 2.2, describe in detail one precaution to make the temperature measurements as accurate as possible.1 mark
- 2(d)(i)Identify and explain the anomalous warm-water temperature reading in Table 2.1.2 marks
- 2(d)(ii)Calculate the decrease in hot-water temperature after 180 s for both beakers.1 mark
- 2(e)(i)Use your answers to 2(d)(ii) to conclude how the water temperature in the beaker affects the rate of cooling of hot water in the test-tube.2 marks
- 2(e)(ii)Suggest one improvement to the procedures with cold and warm beakers to make comparison between their cooling rates more valid.1 mark
- 3(a)(i)Read both edges of the 50 g load in Fig. 3.2 and determine the position of its centre on the rule.2 marks
- 3(a)(ii)Using your centre position from 3(a)(i), calculate distance d from the centre of the 50 g load to the 50.0 cm pivot in Fig. 3.1.1 mark
- 3(a)(iii)Calculate 1000 / d from your 3(a)(ii) distance in cm and record it to three significant figures in the first row of Table 3.1, in cm⁻¹.2 marks
- 3(b)Describe a technique to make distance d as accurate as possible.1 mark
- 3(c)Plot m / g on the y-axis against 1000 / d in cm⁻¹ on the x-axis on Fig. 3.3 and draw a straight line of best fit.4 marks
- 3(d)(i)Show working and mark on your graph the values used.2 marks
- 3(d)(ii)Use your own gradient G from 3(d)(i) and M = 22.2 × G to determine the fixed load mass M, in g.1 mark
- 3(e)Explain why the Fig. 3.1 balancing method is unsuitable if the movable load has mass m = 40 g.1 mark