WAEC 2021 Physics | Practical

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Question 1 View Details
You are provided with a set of masses, two metre rules, a piece of thread, two retort stands and clamps, a stopwatch, split corks and a weighing balance.
Question Parts
(i)
Measure and record the mass, M, of the metre rule.
(ii)
Suspend the metre rule, whose mass has been measured, by means of two vertical strings of equal lengths, l= 70 cm.
(iii)
Make the separation between the threads, d=80 cm.
(iv)
Suspend a mass m=20 g from the mid-point of the metre rule by means of a thread such that the distance between the mass and the rule, h=15.
(v)
Displace the ends of the metre rule in a horizontal plane in opposite directions. Release the rule to perform horizontal oscillations.
(vi)
Determine the time, for 20 oscillations.
(vii)
Evaluate the period T, T^{2} and T^{-2}.
(viii)
Repeat the procedure for four other values of m=30 g, 50 g, 70 g and 100 g keeping the values of h, d and l constant. In each case, determine and evaluate T, T^{2} and T^{-2}.
(ix)
Tabulate the results.
(x)
Plot a graph with T^{-2} on the vertical axis and m on the horizontal axis.
(xi)
Determine the slope, s, of the graph.
(xii)
State two precautions taken to ensure accurate results.
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Question 2 View Details
You are provided with an accumulator, an ammeter, a 2 Ω resistor, a key, K, a resistance wire BP, a crocodile clip, J and other necessary materials.
Question Parts
(i)
Connect the circuit as shown in the diagram above.
(ii)
Use the crocodile clip to hold the resistance wire at D such that BD=d=80 cm.
(iii)
Close the key, read and record the ammeter reading. Evaluate I^{-1}.
(iv)
Repeat the procedure for four other values of d=70 cm, 50 cm, 40 cm, and 30 cm. In each case, record and evaluate I^{-1}.
(v)
Tabulate the results.
(vi)
Plot a graph with d on the vertical axis and I^{-1} on the horizontal axis.
(vii)
Determine the slope s of the graph.
(viii)
State two precautions taken to ensure accurate results.
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