neco model questions vol1 2019 physics | Practical

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Question 1 View Details
A student is required to determine the density of an unknown solid metal using the laboratory balance and a graduated cylinder. The balance reads the mass of the metal as 56.2 g. The graduated cylinder initially contains 120.0 mL of water. After the metal is completely immersed, the water level rises to 135.5 mL.
Question Parts
(a)
State the mass of the metal in kilograms, showing the conversion process.
(b)
Calculate the volume of the metal in cubic centimetres (cm³).
(c)
Determine the density of the metal in g·cm⁻³ and state the final answer to two decimal places.
(d)
Identify two possible sources of systematic error in the experiment and suggest one method to reduce each error.
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Question 2 View Details
A force table is used to verify the vector addition of two forces. The first force (F₁) has a magnitude of 5.0 N and is applied at 30° above the positive x‑axis. The second force (F₂) has a magnitude of 8.0 N and is applied at 120° measured anticlockwise from the positive x‑axis. The resultant force measured on the table is 9.5 N acting at 86° above the positive x‑axis.
Question Parts
(a)
Resolve each force into its horizontal (x) and vertical (y) components, showing all intermediate steps.
(b)
Using the components from part (a), calculate the theoretical magnitude and direction of the resultant force.
(c)
Determine the percent error in the measured magnitude and direction of the resultant force.
(d)
Suggest two possible reasons for the discrepancies between the theoretical and measured values and propose a way to minimise each.
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Question 3 View Details
A smooth wooden board is inclined to the horizontal and a steel ball is released from rest at the top. The length of the inclined surface is 2.00 m and the vertical height of the board is 0.50 m. The time taken for the ball to travel the entire length is recorded using a stopwatch for three trials: 1.30 s, 1.35 s and 1.32 s. The experiment is to be used to determine the acceleration of the ball down the incline and to compare it with the theoretical value g sinθ.
Question Parts
(a)
Calculate the average time taken for the ball to travel the 2.00 m length.
(b)
Using the average time, determine (i) the experimental acceleration of the ball, (ii) the theoretical acceleration (g sinθ) and (iii) the percentage error of the experimental value.
(c)
State two possible sources of error in this experiment and suggest one way to minimise each.
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Question 4 View Details
A vertical spring is attached to a fixed support. Masses are hung from the spring and the corresponding extensions are recorded. The data obtained are: Mass (kg) : 0.10 0.20 0.30 Extension (m) : 0.025 0.050 0.075 The same spring is then used in a simple harmonic motion experiment. A mass of 0.20 kg is attached and the time for 10 complete oscillations is measured as 4.5 s using a stopwatch. The experiment is to determine the spring constant k by (i) the static method and (ii) the dynamic method, and to compare the two values.
Question Parts
(a)
Calculate the spring constant k using the static method for each mass and give the average value.
(b)
Determine the spring constant k from the dynamic (oscillatory) method using the recorded period.
(c)
Calculate the percentage difference between the static and dynamic values of k and discuss one possible reason for any discrepancy.
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