Each candidate to have the following apparatus
Each candidate to have the following
1. You are provided with the following:
- A metre rule
- Vernier calipers
- A 300g mass
- Two knife edges
- Some thread.
Proceed as follows:
a) Place the metre rule on the knife edge such that each knife edge is 45 cm from the 50 cm mark
(centre of the rule). See figure 1. Ensure that the millimetre scale of the metre rule is facing upwards. The distance L between the knife edges is now 900 mm.
Place the vernier calipers vertically against the metre rule at the 50 cm mark with the depth gauge lowered to touch the bench as shown in figure 1.
Record the height h0, of the upper edge of the metre rule at the 50 cm mark. (See figure 1).
b) Using the thread provided, hang the 300g mass at the 50cm mark of the metre rule. Ensure that the
mass does not touch the bench. Measure and record in table 1, the height h of the edge of the metre rule at the 50 cm mark.
c) With the 300g mass still at the 50 cm mark, adjust the position of the knife edges so that L is now
800 mm. (The knife edges should be equidistant from the centre of the metre rule). Measure and record in table 1 the height h of the edge of the metre rule at the 50 cm mark.
d) Repeat the procedure in (c) for other values of L shown in table 1. Complete the table.
Note: Issue students with graph papers
e) Plot a graph of Log L(y-axis) against log d. (5 marks)
f) i) Determine the slope of the graph. (3 marks)
iii) Determine G, the value of log L, when log d=0 (2 marks)
2. You are provided with the following apparatus
- 7 connecting wires
- 2 dry cells(1.5V)
i) Set up the apparatus as in the figure below.
v.) Plot a graph of p.d(y-axis) against current I. (5 marks)
ii) Determine the resistance of the filament of the bulb when I=0.18A, given that Resistance R= V/I (2 marks)
You are provided with the following apparatus- Prism
i) Measure angle A of the prism using a protractor A= (1 mark)
ii) Place the prism on a plain paper and trace its outline with a pencil Attach some Plasticine to the prism to indicate the refractive angle A
iii) Construct a normal at point T along LM. Draw an incident ray to strike the prism at T at 600. Replace the prism and press pins P1 and P2 to define the incident ray. View the pins P1 and P2 from the opposite face(MN). Insert pins P3 and P4 so that they appear to be in line with the images of P1 and P2 .
Remove the prism and join P3 and P4 to give the emergent ray.
Extrapolate the emergent ray into the prism so as to meet the extrapolated incident ray at Q.
iv) a) Measure angle D
D=…………………………… (2 marks)
To get more papers like topical questions, KCSE and KCPE KNEC revision papers and resources, all levels of Kenyan revision materials and other academic aides, which are in downloadable format, visit our sister site and register as a member. To learn on registration, click here.