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# WAEC Physics Practical Questions and Answers 2022 (Alternative A) – %100 Verified & Free EXPO

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172 WAEC Physics Practical Questions and Answers 2022. Verified and legit Physics Alternative A answer the WAEC Practical Physics correctly due to not understanding the questions. I will show you the best way to answer WAEC Physics Practical questions and make a good WAEC Result in your Physics examination. The West African Examinations Council is an examination board established by law to determine the examinations required in the public interest in the English-speaking West African countries, to conduct the examinations and to award certificates comparable to those of equivalent examining authorities internationally ### WAEC Physics Practical Questions and Answers 2022

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### WAEC Physics Practical Alternative A Answers

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1)
TABULATE:
S/N: 1,2,3,4,5
M(g):40.0,60.0,80.0,100.0,120.0
x(cm):37.50,25.0,18.75,15.00,12.50
x^-1(cm^-1):0.027,0.40,0.053,0.067,0.08
x^-1(*10^-3):27.00,40.00,53.00,67.00,80.00
Note: G=50.0cm Y=30.0cm

(1a)
(xi) PRECAUTIONS
(i) I ensured that the meter rule balances horizontally before readings are taken in order to avoid experimental error.
(ii) I ensured that parallax error was avoided when taking the readings on The meter rule by viewing its calibration vertically.

(1bi) Moment of a force can be defined as the product of the force and its perpendicular distance from its point of action.
Moment of a force = force * Perpendicular distance of its line of action from the point
Moment = F * L
The S.I unit is Newton-meter(Nm).
It is a vector quantity

(1bii)

x=50-25
=25cm.
y=80-50
=30cm.
From the principle of moment:
Sum of clockwise moment = Sum of anti-clockwise moment

60 * x=m * y
60 * 25 = m * 30
Divide both sides by 30
60 * 25/30 = m *30/30
m=60 * 25/30
m=2 * 25
m=50g.
++++++++++++++++++++++++++++++++++
(2)

(3a)
(i) E=3.00v
TABULATE.

R(ohms) | I(A) | V(v)
1.0 0.40 0.65
2.0 0.35 0.58
4.0 0.28 0.50
6.0 0.22 0.45
8.0 0.18 0.40

(3aix)
(i) I avoided error due to parallax when reading the ammeter and voltmeter.
(ii) I ensured tight connections.

(3bi)
(Pick any 2)
(i) connecting cells in parallel adds the current capacities together.
(ii) connecting cells in parallel provides alternative Pathways for Current flows.
(iii) When cells are connected in parallel the Total voltage provided do not change

(3bii)
(Pick any 2)
(i) Resistance.
(ii) Tolerance.
(iii) Rated Power Dissipation.
(iv) Package and mounting.
(iv) Voltage rating.

WAEC Physics Practical Questions

WAEC Physics PRACTICAL

QUESTION 1: Apparatus (a) Metre rule
(b) Set of masses (20g, 40g, 60g, 80g, and 100g)
(d) Knife-edge
(f) Weighing balance.

(a) You are provided with a uniform metre rule, a knife-edge, masses, and other necessary apparatus.
(i) Suspend the metre rule horizontally on the knife edge. Read and record the point of balance G of the metre rule. Keep the knife-edge at this point throughout the experiment.
(ii) Using the thread provided, suspend the object labeled W at the 15 cm of the metre rule.
(iii) Suspend a mass M = 20 g on the other side of G Adjust the position of the mass until the metre rule balances horizontally again.
(iv) Read and record the position Y of the mass M on the metre rule.
(v) Determine and record the distance L between the mass and G. Also determine and record the distance D between W and G.
(vi) Repeat the procedure for four other values of M = 40g, 60g, 80g, and 100g. In each case, ensure that W is kept constant at the 15 cm mark and the knife-edge at G.
(viii) Plot a graph of M on the vertical axis against L­¹ on the horizontal axis.
(ix) Determine the slope s, of the graph.
Evaluate s/D
(x) State two precautions taken to obtain accurate results.

(b) (i) State the principles of moments.
(ii) Define centre of gravity.

ANS: a. (x) state any two of the following precautions in an acceptable form of speech.
– draught was avoided
– parallax error on the reading metre rule was avoided
– repeated readings (must be shown on the table)
– ensured suspended masses did not touch the table.

b. (i)The principle of moment states that for a body in equilibrium, the sum of the clockwise moments about a point is equal to the sum of the anticlockwise moments about the same point.
(ii) The centre of gravity of a body is defined as the point through which its resultant weight acts.

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QUESTION 2:
Apparatus
(1) Laboratory thermometer
(2) 600ml supply of water
(3) Retort stand and clamp
(4) One copper calorimeter, 150ml capacity; unlagged
(5) Glass rod stirrer
(6) Non-conducting pad for calorimeter(e.g Cardboard)
(7) Measuring Cylinder (200ml)
(8) Stopwatch/clock
(9) Bunsen burner/source of heat.

a) Diagram The principal foci, P and Q, of a converging lens were determined. The image of an illuminated object O, placed at a distance, m, from P is obtained on a screen S placed at a distance n from Q as shown in the diagram above. The procedure is repeated for various values of m and the corresponding values of n were measured and recorded.

In figure 2 (a), POi represents the distance mi between P and the positions of the illuminated object Oi.
(i) Measure and record the values of m = POi using the given scale.
(ii) Measure and record the corresponding values of n = QSi using the given scale.
(iii) Evaluate n-1 in each case.
(v) Plot a graph with n-1 on the vertical axis and m on the horizontal axis.
(vi) Determine the slope, s, of the graph.
(vii) Evaluate k=1/<s
(viii) State two precautions that are necessary to ensure accurate results when performing this experiment.

(b) (i) State two applications of a converging lens.
(ii) An object is placed 10 cm from a converging lens. When a plane mirror is placed vertically behind the lens, the image formed coincides with the object. Calculate the focal length of the lens.

QUESTION 3:

Apparatus (i) Voltmeter  (0 -2V)
(ii) Two dry cells (1.5V each) connected in series(connecting leads should be provided for the battery)
(iii) Potentiometer
(iv) Key/switch
(v) Jockey
(vi) Metre bridge
(vii) Connecting wires
(viii) Ammeter (0 – 2A).

a) Diagram A circuit is connected as shown in the diagram above. The e.m.f. of battery is 1.5 V with the resistance in the resistance box RB set at RI and the key K closed, the current II in the circuit is read with the ammeter A. The procedure is repeated for five other values of R.
(i) Read and record the values of R.
(ii) Read and record the corresponding values of I.
(iii) Evaluate P = in each case.
(v) Plot a grace with P on the vertical axis and R on the horizontal axis starting both axes from the origin (0,0).
(vi) Determine the slope, s, of the graph.
(vii) Determine the intercept, c, on the vertical axis.
(viii) State the physical quantity represented by the intercept on the vertical axis.
(ix) State two precautions that are necessary to ensure accurate results when performing this experiment.

(b) (i) Define the internal resistance of a cell.
(ii) A cell of e. m. f. 4.5 v is connected across a resistor of resistance 4 Ω. If a current of 0.9 A passes through the circuit, calculate the internal resistance of the cell.

WAEC Physics Practical Questions