WAEC

# Waec 2022 Physics Practical Questions And Answers

The Waec 2022 Physics Practical Questions and answers and alternative to practical question calculations have been detailed below.

The West African Examination Council (WAEC) Physics Practical Alternative paper will now be written on Tuesday, 31st May 2022 from 08:30 hrs. to 11:15 hrs. (1st Set) and 11:45 hrs. to 14:30 hrs. (2nd Set).

Candidates who will be sitting for the WAEC Physics Practicals 2022 exam are to take note of the details below.

As usual, the school will be providing you with the Waec physics apparatus, materials, and calculations that are used for the West African Examination Council May/ June exam. Also referred to as waec physics practical specimen.

Take note of the Waec 2022 Physics Practical Specimens and study them well because questions will be asked mainly from them.

Know more about the chemicals, instruments and the apparatus to be used because questions will be asked from them.

• #### Waec 2022 Chemistry Practical Specimen

Candidates have to study carefully the specimen which have been released already so as to be more familiar with the tools so that answering the questions will be a lot more easier for the candidates.

Make sure that the practicals are carried out carefully and it must be done by yourself.

This act of carefulness is mostly required in this process so as to get the required numericals so as to get the answers appropriately which will help in the plotting of graph.

### WAEC 2022 Physics Practical Questions And Answers      (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.

### WAEC Physics Practical Questions and Answers 2022

QUESTION 2:

You are provided with a beaker, a thermometer, a stirrer, a measuring cylinder, a Bunsen burner, a wire gauze, a pair of tongs, water, tripod stand and other necessary materials.

(i) using a measuring cylinder, measure 150cm3 of water into the beaker.

(ii) record the volume v of the water in the beaker

(iii) calculate the mass m of the water, given that m = pv and p =1gcm-3

(iv) measure and record the initial temperature of the water in the beaker.

(viii) evaluate

(ix) empty the content of the beaker and repeat the procedure above for other values of v = 200cm3, 250cm3, 300cm3 and 350cm3

### WAEC Physics Practical 2022 Questions and Answers Continues

QUESTIONS

(ii) plot a graph with m on the vertical axis against on the horizontal axis

(iii)determine the slope s of the graph

(iv) Evaluate k=

(v) State two precautions taken to ensure accurate results

7(b) (i) define heat capacity

(ii) an electric kettle rated 1.3kw is used to heat 800g of water initially at a temperature of 20. Neglecting heat losses, calculate the time taken for the kettle to heat the water to its boiling point (take the boiling point of water = 100. Specific heat capacity of water = 4200Jkg-1k-1)

### WAEC Physics Practical Questions 2022 and Answers

QUESTION 3:

You are provided with a potentiometer AB, 2Ω standard resistor R, A battery of emf 3.0 v, a jockey J and other necessary materials

(i) connect a circuit as shown in the diagram above

(ii) close the key K. Without J making contact with AB , read and record the ammeter reading I. Open the key

(iii)use the jockey to make contact with AB at the 20cm mark such that AJ = x =20cm. close the key, read and record the ammeter reading I

(iv) Evaluate x-1

(v) repeat the procedure for values of x = 35cm, 45cm, 60cm and 80cm respectively

QUESTIONS

(ii) plot a graph with x-1 on the vertical axis and I on the horizontal axis starting both both axes from the origin (0,0)

(iii)determine the slope s of the graph

(iv) from your graph, determine the value I0 of I for which x-1 = 0

(v) Evaluate

(vi) State two precautions taken to ensure accurate results

12b(i) define emf of a battery

(ii) a cell X of emf 1.018v is balanced by a length of 50.0cm on a potentiometer wire. Another cell Y is balanced by a length of 75.0cm on the same wire. Calculate the emf of Y

3.

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.

(1x)

(Tabulate)

S/N: 1|| 2|| 3|| 4|| 5||

M(g): 20.00|| 40.00|| 60.00|| 80.00|| 100.00||

Z(cm): 40.00|| 35.00|| 30.00|| 25.00|| 20.00||

y(cm): 35.00|| 30.00|| 25.00|| 20.00|| 15.00||

x(cm): 10.00|| 15.00|| 20.00|| 25.00|| 30.00||

V: 0.2857|| 0.5000|| 0.8000|| 1.2500|| 1.2500|| 2.0000||

(1xiv)

(i) I avoided parallax error when taking readings from the meter rule

(ii) I avoided drought by switching off the electric fans

(1bi)

An object is said to be in a stable equilibrium a slight displacement, the object tends to return back to its original position.

(2aix)

-precautions-

-I ensured that all apparatus are in straight line

-I avoided error due to parallax when reading the metre rule

-I avoided zero error on the metre rule

The characteristics of image formed are:

-It is virtual

-It is enlarged and magnified ie twice or two times as big as the object m=2

(2bi)

u=10cm

f=15cm

Using 1/v+1/u=1/f

1/f-1/u=1/v

1/v =1/15-1/10

1/v =(2-3)/30

1/v=-1/30

v=-30cm

(2bii)

The concave mirror mounted in its holder is moved to and fro in front of the screen until a sharp image of the cross wire of the ray box is formed on the screen adjacent of the object.

The distance between the mirror and the screen was measured as 30cm since the radius of curvature r=2fo then half is distance

(2bi)

The characteristics of imaged formed are:

i)It is virtual

ii) It is enlarged or magnified i.e. twice or two times bigger as the object(m=2)

(3ax)

S = Roα

6.625 = 0.85(α)

α = 6.625/0.85 = 7.79

C = -(Ro + β)

= -5.75 = -(0.85 + β)

β = 5.75 – 0.85

β = 4.9

(3axi)

(i) I ensured tight connections.

(ii) I avoided error due to parallax when reading the voltmeter.

(3bi)

Vab = 12 – 8 = 4v

Rab = 4×5/4+5 = 20/9ohms

Iab = Vab/Rab = 4/20/9 = 4 ×9/20 = 9/5

=1.8A

Power = I²ab Rab

=1.8² * 20/9

= 7.2watts

(3bii)

Current in line = power/voltage = 3600/240

=15A

Circuit breaker remain closed because current in line is less than 20A