WAEC Physics Practical Questions and Answers Expo 2023/2024

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You will be expected to carry out an experiment and report your observation. What you will see will not be far from the WAEC Physics Specimen given to your school.

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According to the timetable, WAEC Physics Practical EXAMINATION HAS BEEN SCHEDULED TO TAKE PLACE ON

Friday, 17th June 2023

• Physics 3 (Practical) (Alternative A) › 08:30 hrs. – 10:30 hrs. (1^st Set)
• Physics 3(Alternative B) (Alternative to Practical Work) ****/***** › 08:30 hrs. – 10:30 hrs.
• Physics 3 (Practical) (Alternative A) › 11:00 hrs. -13:00 hrs. (2^nd Set)

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WAEC Practical Physics Questions and Answers (Expo)

Note: The answers below are the 2022 May/June answers.

—————————————————————–

The answers below are for 2022

Note:

For Question 1

Use your school’s Mo = ?

Use your school’s m = ?

Use your school’s d = AG = ?

---

Note: The questions below are for practice.

1. (a) you are provided with a pendulum bob,a metre rule, a stop watch,a retort stand with clamp and other necessary apparatus.

(i) Suspend the pundulum-bob from the clamp as illustrated inthe diagram.

(ii)adjust the pundulum such that AC = L = 90cm.

(iii) Displace the pendulum bob is slightly such that it oscilliates in a vertical plane

(iv) Measure and record the time t for 20 complete oscillations.

(iv) Evaluate T and the square root of L

(vi) Repeat the procedure for four other values of L = 80cm, 70cm, 60cm and 50cm.

(vii) Tabulate your readings

(viii) Plot a graph  with T on the Vertical axis and square root of L on the horizontal axis.

(ix) Determine the slope, s, of the graph.

(x) Evaluate g = 4n²/_S2 (xi) State two precautions taken to ensure accurate results.

(b) (i) Determine from your graph the period of the pendulum for L = 75cm

(ii) A simple pendulum bob is set into simple harmonic motion. Sketch a diagram of the set up and indicate on it; the position of;

(a) Maximum Velocity;

(b) Maximum acceleration of the bob.

1. (a) You are provided with a metre rule, lens, screen, ray box and other neccessary aparatus.

(i) Set up the experiment as shown in the diagram above. Measure and record the diameter a_o ­­­­of the illuminated object.

(ii) Place the object at a distance x = 25cm from the lens. Adjust the screen until a sharp image is obtained on the screen.

(iii) Measure and record the diameter a, of the image.

(iv) Measure and record the distance v between the lens and the screen.

(v) Evaluate y a/a_o , P = 1+y²/y and T = x + y,

(vi) Repeat the procedure for x = 30cm, 35cm, 40cm and 45cm. in each case, determine the corresponding values, a,v,y,P and T,

(vii) Tabulate your results

(viii) Plot a graph of P on the Vertical axis against T on the horizontal axis starting both axes from the origin (0.0).

(ix) Determine the slope, s, of the graph.

(x) Determine the intercept, c, on the horizontal axis.

(xi) Evaluate k = c/2

(xii) State two precautions taken to ensure accurate results.

(b) (i) Explain the statement the focal length of a converging lens is 20cm.

(ii) An object is placed at a distance x from a converging lens of focal length 20cm. If the magnification of the real image formed by the lens is 5, calculate the value of x.

(3) (a) You are provided with an ammeter, resistor, key, metre bridge and other necessary apparatus.

(i) Consider a circuit as shown  in the diagram above.

(ii) Close the key and use the jockey to make contact with AB at N such that AN – d = 25cm.

(iii) Read and record the ammeter reading I.

(iv)  Evaluate I^-1.

(v) Repeat the procedures for values of d = 35cm, 50cm, 65cm, and 80cm. In each case record I and determine I^-1.

(vi) Tabulate your results.

(vii) Plot a graph with logI^-1 on the vertical axis and d on the horizontal axis.

(viii) Determine the slope, s, of the graph .

(ix) State two precautions taken to obtain accurate results.

(b) (i) Use your graph to determine the value of d = I = 1.5 A. (

ii) State two factors which affect the resistance of a wire.

PHYSICS PRACTICAL ANSWERS

1. (a)

Sn        Lcm     ¹1 (s)                ¹2(s)

(ix) slope = 1.75-1.00/9.0-4.7 = 0.75/4.3 _S/cm = 0.174_S/cm

(x) g = 4n²/_S2 = 4 x (3.142)2/(0.174)cm/s = 1,303cm/s

(xi) The precautions taken to ensure accurate results.

• I avoided conical oscillation
• I avoided zero error on the stopwatch
• I ensured that the bob did not touch the table.

b(i) When L = 75cm

Square root of L = Square root of 75 = 8.66cm

T = 1.675_S

1. (a)

(ix) Slope = 2.9-0.4/90 – 47 = 0.0581

(x) Intercept on the horizontal axis = 40.0cm

(xi) k = c/2 = 40.0/2 = 20.0cm

(xii) Precautions

•   I avoided zero error on the meter rule
• I avoided parallax error in reading metre rule
• I made sure the surface of the lens is cleared
• I made sure that the lens was kept upright

1. (b)

(i) The focal length of a converging lens in 20cm means that the distance between the optical centre and the lens is 20cm.

(ii) 1/x + 1/v = 1/f

m = v/x > 5= v/x

v = 5x

1/x + 1/5x = 1/20

6/5x = 1/20

x = 24cm

3.

(x) Precautions

• I ensured tight connections
• I avoided zero error on the ammeter
• I avoided parallax error when taking reading on the ammeter

(b) (i)

when I = 1.5A

log 1^-1 = log [1/15]s

= log 0.67

= 0.174

when log 1^-1 = 0.174

d = 10cm

(ii) Factors affecting resistance

• Thickness of wire
• The cross-sectional area of the wire
• Temperature