Cambridge International Examinations Cambridge Ordinary Level · PHYSICS 5054/42 Paper 4 Alternative to Practical May/June 2018 1 hour Candidates answer on the Question Paper. No
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Cambridge International ExaminationsCambridge Ordinary Level
PHYSICS 5054/42Paper 4 Alternative to Practical May/June 2018 1 hourCandidates answer on the Question Paper.No Additional Materials are required.
READ THESE INSTRUCTIONS FIRST
Write your Centre number, candidate number and name on all the work you hand in.Write in dark blue or black pen.You may use an HB pencil for any diagrams or graphs.Do not use staples, paper clips, glue or correction fluid.DO NOT WRITE IN ANY BARCODES.
Answer all questions.
Electronic calculators may be used.You may lose marks if you do not show your working or if you do not use appropriate units.
At the end of the examination, fasten all your work securely together.The number of marks is given in brackets [ ] at the end of each question or part question.
(c) The student adjusts the variable resistor and measures the new values of V and I. Her values are shown in the table of Fig. 1.3. The lamp is dimmer.
Use the equation
R = VI
to calculate the resistance R of the lamp for both settings of the variable resistor.
Record your answers in the table to an appropriate number of significant figures.
[1]
(d) The student thinks that because the same lamp is used throughout the experiment, its resistance is constant.
State whether the student’s results confirm this. Justify your answer by referring to the results.
(a) A ray of light is incident on the mirror at B with an angle of incidence of 40°.
On Fig. 2.1, draw a line 10 cm long from B to the left of the normal and below the mirror to represent the incident ray. Label the other end of the line D. [2]
(b) • The student replaces the mirror.• She places a pin P1 close to point B on the line DB and places a second pin P2 at
point D.• She views the images of P1 and P2 in the mirror from the direction indicated by the
eye E in Fig. 2.1.• She places two pins P3 and P4 on the paper so that P3 and P4, and the images of P1
and P2 when viewed by E, are in a straight line.
The positions of P3 and P4 are shown in Fig. 2.1.
(i) On Fig. 2.1, draw a line joining the positions of P3 and P4. Continue your line until it reaches the mirror. [1]
(ii) Measure the angle of reflection r.
r = ............................ ° [1]
(c) State one precaution that the student should take when positioning the pins to obtain an accurate value for r.
(b) The student repeats the procedure by moving mass M and placing its centre on the 85.0, 80.0, 75.0 and 70.0 cm marks of the metre rule. Her results are shown in the table of Fig. 4.3.
The distance from the left-hand end of the metre rule to the centre of mass M is r2.
(i) Record, in the table of Fig. 4.3, the missing values of x and y. [1]
(ii) On the grid in Fig. 4.4, plot a graph of y (y-axis) against x (x-axis). Start your axes from the origin (0,0). Draw the straight line of best fit. [4]
(iii) Determine the gradient of your line.
Show your working and indicate on your graph the values you choose.
gradient of line = ....................................................... [2]
(iv) The mass m, in grams, of the copper cylinder is given by the equation
m = 150 × gradient.
Use this equation to calculate m to the nearest gram.
m = ....................................................... g [1]
Question 4 is continued on page 12.
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