Filed in WAEC News on August 6, 2021

Are you writing the SSCE Examination for this academic year? Be it WAEC, NECO, GCE, you need to know the exact set of questions that you will be tackling. This article provides information regarding the WAEC Physics Practical Questions and Answers. These questions are often repeated questions and you need to know them in order to scale through the hurdle of the WAEC practical examination.

The practical has two alternatives (Alternative A and B) and the questions are divided into three categories which are mechanics, light, and electricity.

The student are eagerly awaiting their practical exams and a material like this is the perfect handout which applicants need in other to prepare properly while waiting for the Exams.

## Important Things to Know About WAEC Physics Practical Exams

• You must have a composite table showing all the parameters in the question with clear headings (make sure you state the unit in the table and graph)
• Your values must be at least 2 decimal places (d.p). Beware of inconsistent d.p.
• Systematic error, gross error, and disregard of instruction are always penalized
• The axes of your graph must be correctly distinguished
• Use reasonable scale
• You must plot all your points correctly

## Likely and repeated WAEC Physics Practical Questions and Answers

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.

(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.

2. (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 a­­­­of 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/ao , 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,

(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.

(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.

(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.

1. (a)

Sn        Lcm     11 (s)                12(s)

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

(x) g = 4n2/S2 = 4 x (3.142)2/(0.174)cm/= 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 = 1.675S

2. (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

2. (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

## Precautions to be taken in WAEC Physic Practical’s

Mechanics

• Avoided parallax error in reading stopwatch/clock/metre rule
• Noted/corrected/avoided zero error on stopwatch/clock/metre rule
• Avoided draught
• Avoided conical oscillation
• Ensured that support was rigid
• Ensured bob of pendulum was free from table

Light

• Avoided parallax error in reading metre rule/protractor
• Optical pins inserted vertically
• Reasonable spacing of pins
• Well sharpened pencil used
• Repeated readings shown on table
• Surface of prism cleaned
• Surface of lens cleaned
• Lens kept upright

Electricity

• Key opened in between readings
• Tight connections used
• Avoided parallax error when taking readings on voltmeter or ammeter
• Clean terminal ensured
• Avoided zero error on voltmeter or ammeter
• Repeated readings shown on table

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