RACHUONYO SOUTH DISTRICT PHYSICS PRACTICAL QUESTIONS
1. You are provided with the following:-
- Ammeter
- A voltmeter
- A straight wire XY mounted on a millimeter scale
- Two jockeys
- 7 connecting wires
- A micrometer screw gauge (to be shared)
- A cell holder for two dry cells
- Two dry cells
- A switch
Proceed as follows:
(a) Using the micrometer screw gauge, determine the diameter ‘d’ of the wire XY
d = ________________________mm Set-up the apparatus as shown below:-
With both jockeys set at L = 10cm from X, measure current I through the wire and voltage
V across it. Repeat this procedure for the other values of L and record in the table below:
Length (cm) | 10 | 30 | 40 | 50 | 70 | 80 | 100 | |
Length (m) | ||||||||
Current I(A) | ||||||||
Voltage V(V) | ||||||||
R = V/I() |
(b) (i) Using the values in the table above, plot a graph of I(A) against R() on the grid provided
(ii) Determine the gradient of the graph at R = 10
(iii) Given that –I = πd2R
where L = 60cm, find the value of K
4KL
2. You are provided with a glass vessel of a minimum height of 12cm and a minimum diameter
of 6cm, a retort stand and clamp, two optical pins labelled A and B, liquid M, ½metre rule
and a cork:
Procedure
Place a pin A at the bottom of the glass vessel and then pour liquid M upto a height of 2cm from the bottom of the glass vessel. Move pin B on a sliding cork adjacent to the jar up or down until there is no parallax between it and the image of pin A. mark on the outside of the beaker where the image pin is located
- Measure X and record its value X = ____________________________ cm mk)
(Note that Xis the distance between top level of liquid M and where the image of pin is located)
(b) Repeat this procedure for different values of y from the initial value of 2cm in steps of 2cm. complete the table shown below:
Ycm | 2 | 4 | 6 | 8 | 10 | 12 |
X cm |
Arrangement of apparatus
(c)Draw a graph of x (y-axis) versus y on the grid provided
(d) Calculate the slope, S of your graph
(e) Given that n = 1 , calculate the value of n
s
B. You are provided with the following:
- A half metre rule
- Two pieces of thread
- 50g mass
- A retort stand, clamp and boss
Proceed follows
- Using a loop of thread suspend the half metre rule on the retort stand as shown below, at 41cm
- Using the second loop suspend the 50g mass at a point that sets the half metre rule in equilibrium, as shown below. (Horizontally balanced)
Record the value of
P = ……………………………………..cm
Using the equation; M x q = P x 50, calculate the value of M
N/B
q + 25 = 41
RACHUONYO SOUTH DISTRICT PHYSICS PRACTICAL ANSWERS
1. a) d = 0.3mm
Length (m) | 0.1 | 0.3 | 0.4 | 0.5 | 0.7 | 0.8 | 1.0 |
I (A) | 0.7 | 0.44 | 0.36 | 0.28 | 0.22 | 0.19 | 0.16 |
V/I V(V) | 1.2 | 1.80 | 2.10 | 2.40 | 2.5 | 2.6 | 2.74 |
V/I = R () | 1.17 | 4.09 | 5.83 | 8.57 | 11.36 | 13.7 | 17.13 |
b) i) Scale S1 Axes A1
Plotting P2 Curve C1
ii) Targent = 0.47 – 0.2
Co-ordinates 12 – 0
Correct working = 0.0225
iii) –I = Rd2
4KL
I = d2
R 4KL (Slope at R = 10)
-0.0225 = – x (0.3 x 10-3)2
4 x K x 0.6
K = 3.927 x 10-4
m-1 A-1
b)
y cm | 2 | 4 | 6 | 8 | 10 | 12 |
x cm | 1.5 | 3 | 4.5 | 6 | 7.5 | 9 |
c) A1 S1 P2 L1
d) S = 6 – 4.5
8 – 6 = 0.75
e) n = 1.333
P = 8cm
M x 16 = 8 x 50
M = 25g
