Physics · Paper 2A · 2025

3 questions 🇹🇿 NECTA ✓ Official NECTA answers

CSEE 🇹🇿 NECTA ✓ Official NECTA answers

Physics · Paper 2A · 2025

3 questions

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Questions (3)

Section A

1. 25 marks

(a) Pin the clean white paper on the drawing board, and then draw two straight lines M,M, and M,M, such that the angle between the lines x° is 10° as shown in the following Figure. 1 mk

(b) Draw a line through J to represent the incident ray, and then erect two pins A and B on this line as shown in the given figure. Place the reflecting surface of the mirror along M,M2. 1 mk

(c) Erect pins C and D to appear in line with the images of A and B. Remove the pins C and D, and then mark their position with pencil. Draw the line JCD to represent the reflected ray. 1 mk

(d) Rotate the mirror such that it is along line M,M4. Erect pins E and F to appear in line with the images of Aa ndB. Remove the pins E and F then draw the line JEF to represent the new position of the reflected ray. 1 mk

(e) Remove the mirror and pins A and B then measure the angle y° as shown in the figure. 1 mk

(f) Repeat the procedures in 2 (a) to (e) for values of x= 15°,25°, 35° and 40°. Record the corresponding values of angle y° in each case. 1 mk

(i) Prepare a table for values of x° and y°. 1 mk

(ii) Plot a graph of y° against x°. 1 mk

(iii) Calculate the slope of the graph plotted in 2 (ii). 1 mk

(iv) How is x° related to y°? 1 mk

(v) What is the aim of doing this experiment? 1 mk

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2. 0 marks

You are required to perform an experiment to investigate optical properties of a plane mirror. You are given a plane mirror glued on wooden block, 4 optical pins, 4 thumb pins, white paper, protractor and drawing board. Proceed as follows: