WAEC 2024 Physics | Practical

(i) Suspend the mass, m=20 g on the spring balance and measure the weight in air, W_{A} in Newton. (ii) Immerse the suspended mass completely in water and measure weight in water, W_{W} in Newton. Evaluate U_{1}=W_{A}-W_{W}. (iii) Immerse the suspended mass completely in the liquid L of the same volume with water and measure the weight in liquid W_{L}. Evaluate U_{2}=W_{A}-W_{L}. (iv) Repeat the procedure for m=40 g, 60g, 80g, and 100g respectively. In each case, evaluate W_{A}, W_{W}, U_{1}, W_{L}, U_{2}. (v) Tabulate the readings. (vi) Plot a graph of U_{1} on the vertical axis and U_{2} on the horizontal axis starting both axes from the origin (0,0). (vii) Determine the slope s of the graph. (viii) Evaluate K=\frac{1}{s}. (ix) State two precautions taken to ensure accurate results.

(i) State the Archimede's Principle. (ii) State two differences between density and relative density.

(i) Connect R_{x} in the left hand gap of the metre bridge, a length L=100 \mathrm{~cm} of wire in the right hand gap and the other apparatus as shown. (ii) Determine and record the balance point P on the metre bridge wire NQ. (iii) Measure and record L_{x}=\mathbf{N P} and L_{y}=\mathbf{P Q}. (iv) Evaluate R_{1}=\left(\frac{L_{y}}{L_{x}}\right) R_{x}. (v) Repeat the procedure for four other values of L=90 c m, 80 c m, 70 c m and 60 cm. In each case, determine and record the balance point P, and evaluate R_{1}. (vi) Repeat the experiment with the second wire B. Obtain the balance point P and evaluate R_{2} in each case. (vii) Tabulate the readings. (viii) Plot a graph of R_{2} on the vertical axis and R_{1} on the horizontal axis. (ix) Determine the slope, s, of the graph. (x) Evaluate k=\sqrt{s}. (xi) State two precautions taken to ensure accurate results.

(i) State two advantages of potentiometer over voltmeter for measuring potential difference. (ii) Define internal resistance of a cell.

(i) Set up a circuit as shown in the diagram above with E=3.0 V. (ii) Close the key. (iii) Record the voltmeter reading, V. (iv) Read the corresponding ammeter reading, I. (v) Evaluate V^{-1} and I^{-1}. (vi) Repeat the procedure for the four other values of E=4.5 V, 6.0 V, 7.5 V and 9.0 V. (vii) Tabulate your readings. (viii) Plot a graph with I^{-1} on the vertical axis and V^{-1} on the horizontal axis starting with both axes from the origin (0, 0). (ix) Determine the slope, s of the graph. (x) Also, determine the intercept, c on the vertical axis. (xi) What does the slope, s represent? (xii) State two precautions taken to ensure accurate results.

(i) State two methods by which an electric current can be produced. (ii) State Ohm's law.

(i) Place one of the metre rules on a knife edge and determine the centre of gravity, C. (ii) Measure and record the mass, M_{R} of the metre rule. (iii) Attach the mass =100 g firmly to the metre rule A B at C using paper tape. (iv) Suspend the metre rule by two parallel threads of length, h=40 \mathrm{~cm} each at the 10 cm and 90 cm mark. Ensure that the graduated face of the metre rule is facing upwards. (v) Set the metre rule into small angular oscillation about the vertical axis through its centre of gravity. (vi) Determine the time, t for 20 complete oscillations. Evaluate the period T and T^{2}. (vii) Read and record the value of d in metres. (viii) Keeping d constant, repeat the procedure for four other values of h=50, 60, 70, and 80 cm. In each case, determine t and evaluate T and T^{2}. (ix) Tabulate the readings. (x) Plot a graph of T^{2} on the vertical axis and h on the horizontal. (xi) Determine the slope, s of the graph. (xii) Evaluate k=S / Q where Q=\frac{2}{25 d^{2}}. (xiii) State two precautions taken to ensure accurate results.

(i) Define couple as it relates to oscillatory motion. (ii) Give two practical applications of a couple in everyday life.