**WAEC Physics Practical Questions and Answers 2021. Many WAEC candidates find it difficult to 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 grade in your Physics examination.**

You need to understand the WAEC Physics Practical marking scheme before attempting any question so as to present your answers in such a way that it will look attractive to the examiner to earn you big marks.

Bear it in mind that every single procedure is awarded marks. So, ensure you do not skip any step while reporting and presenting your practical results. And do not forget to remember that the units are very important.

The Physics Practical question paper will consist of three areas and general Physics questions namely:

- Optics
- Electricity
- Mechanics

You will be expected to carry out an experiment, take readings and tabulate your values, plot graph, state precautions taken during the experiment, and report observation.

What you will see will not be far from the WAEC Physics Specimen given to your school.

**Note: Ensure you avoid parallax error while taking your readings to get accurate results and do not forget to choose lines of best fit while plotting the graph. It is not compulsory that all the points will enter the line.**

## WAEC Practical Physics Questions and Answers

Today’s Physic practical 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 = 80*cm*, 70*cm*, 60*cm* and 50*cm*.

(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 = 4*n*^{2}/_{S}2 (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 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+y^{2}/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 ^{1}1 (s) ^{1}2(s)

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

(x) g = 4*n*^{2}/_{S}2 = 4 x (3.142)2/(0.174)*cm*/*s *= 1,303*cm/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}

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

## 2021 WAEC Physics Practical Answers

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( 2020 Answers)

**(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)**

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**++++++++++++++++++++++++++++++++++ (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.**

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