Physics 3 (Practical) (Alternative A) 09:30 am. – 12:15 pm.

WAEC 2022 PHYSICS PRACTICAL SPECIMEN*

*QUESTION 1*

-Metre rule
-Knife edge
-A piece of string
-A weighing balance
-A weight hangerI
– A set of masses, M = (20g, 40g, 60g, 80g and 100g)

*QUESTION 2*

-Deep transparent vessel filled with water
-Vernier calipers
-Standard Masses, m = (2g, 5g and 10g)
-A piece of string
-Forceps (To be used to pick masses placed inside the boiling tube)
-Source of heating

Additional Information:
(a) Test tube or boiling tube of the following dimensions:
Length: at least 14cm
External diameter: 2.5cm

The teacher should:
(b) Use starch to fix a strip of graph sheet marked in centimeters inside the boiling tube or test tube. The 0 centimeter mark of the scale should be at the bottom of the tube.

(c) Place sufficient amount of dry sand or lead shot in the test tube or boiling tube to make it just float, when that is done, pour it into a small polythene and seal it. Push the sealed sand or lead shot to the bottom of the tube.

*QUESTION 3*

-Jockey
-2 dry cells(1.5v each) connected in series;
-Connecting leads should be provided for the battery
-Ammeter(0 – 2A)
-Potentiometer
-Key/switch
-Standard resistor, R of resistance 2ohms
-Connecting wires.
[5/31, 3:51 AM] Inknation: *PHYSICS PRACTICAL*

👂 ```WHAT YOU NEED TO KNOW```

*OBSERVATIONS*

👉 *OBSERVATION ON Question 1*

✓ Record L^-1 to the required accuracy to avoid difficulties in plotting graph.
✓ Evaluate and record five values of L^-1 to at least 3 d.p
✓ Show composite table (containing the required variables in the question)

👉 *OBSERVATION ON Question 3*

✓ Record I^-1 or L^-1 to the required accuracy to avoid difficulties in plotting graph.
✓ Evaluate and record five values of I^-1 or L^-1 to at least 3 d.p
✓ Show composite table (containing the required variables in the question)


👉👉 *PLOTTING GRAPHS*


1. Both axes correctly distinguished.
2. Plot a graph using reasonable scales.
3. Draw line of best fit.
4. Determine the slope and intercept of the graph.
5. Evaluate correctly.

*PRECAUTIONS*

*State any two of the following precautions for QUESTION 1.*

i. I avoided draught.
ii. I avoided parallax error in reading metre rule.
iii. I ensured suspended masses did not touch the table.
iv. I noted zero error on the meter rule.

*State any two of the following precautions for QUESTION 3.*

i. I ensured I open the key when not taken readings.
ii. I avoided parallax error when taking the readings on the ammeter.
iii. I ensured zero error was noted and corrected on the ammeter.
iv. I clean and tight connection of the terminals.
v. I ensured the Jockey not slide/drag on potentiometer wire.


*In Part b, QUESTION 1*

👉 The expected Questions are:

(i) *State the principle of moment*

The principle of moments 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) *Define Center of Gravity*

The centre of gravity of a body is defined as the point through which its resultant
weights acts.

OR
The point where the weight of the body acts or appears to act.

OR
The point through which the line of action of the weight of the body passes irrespective of the position or shape of the body.

(iii) Define Moment of force

(iv) Calculations on moment of force

(v) State the conditions necessary for equilibrium

(vi) Why is center of gravity does not have effect on a body at equilibrium?


*In Part b, QUESTION 3*

👉 The expected Questions are:

(i) Define emf of a cell

(ii) Define potential difference

(iii) State two devices in which Ohm's law does not apply.

(iv) Circuit calculation (Resistivity).