neco model questions vol1 2025 physics | Practical

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Question 1 View Details
An irregularly shaped metal object is to be investigated for its density using the water‑displacement method and a top‑loading balance.
Question Parts
(a)
The mass of the object is measured on a balance that reads 125.6 g. State the least count of the balance and write the mass of the object correct to the appropriate number of significant figures.
(b)
The object is then gently placed in a graduated cylinder containing water. The initial water level is 250.0 mL and the final level after immersion is 285.5 mL. Determine the volume of the object in cm³, stating any assumptions made.
(c)
Calculate the density of the metal object in g cm⁻³ and give your answer to three significant figures.
(d)
Identify two possible sources of systematic error in the experiment and suggest a practical way to minimise each error.
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Question 2 View Details
A force table is used to investigate the addition of two non‑collinear forces acting on a ring at the centre of the table.
Question Parts
(a)
Two forces are applied as follows: • Force F₁ = 5.0 N acting at 30° to the positive x‑axis. • Force F₂ = 8.0 N acting at 120° to the positive x‑axis. Record the horizontal (x) and vertical (y) components of each force, showing the sign convention used.
(b)
Using the component values obtained in part (a), determine the magnitude of the resultant force R to two decimal places.
(c)
Find the direction θ of the resultant measured from the positive x‑axis, giving your answer to the nearest degree.
(d)
Explain why the order in which the two forces are added does not affect the resultant, and state one experimental factor that could cause the measured resultant to differ from the calculated value.
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Question 3 View Details
A student uses a ticker timer (interval of 0.02 s) to study the motion of a cart down an inclined plane that is 1.20 m long and makes an angle of 30° with the horizontal. After releasing the cart from rest at the top, the student records the distances between five successive dots on the ticker strip as follows (in metres): 0.012, 0.020, 0.028, 0.036. The cart reaches the bottom of the plane during this observation.
Question Parts
(a)
Calculate the instantaneous speed of the cart at each recorded interval.
(b)
Assuming the cart moves with constant acceleration, determine the magnitude of that acceleration.
(c)
Calculate the theoretical acceleration of the cart down the plane using g sinθ and compare it with the experimental value obtained in part (b). State a possible reason for any discrepancy.
(d)
Identify two possible sources of systematic error in this experiment and suggest how each could be minimised.
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Question 4 View Details
A student investigates Hooke’s law using a spring fixed to a stand. The spring is initially unstretched. The following data are recorded when masses are hung from the spring (g = 9.8 m s⁻²): Mass (kg) Extension (cm) 0.20   1.5 0.40   3.0 0.60   4.5 0.80   6.0 1.00   7.5 The experiment is repeated with a second spring and the extensions obtained are: Mass (kg) Extension (cm) 0.20   2.0 0.40   4.5 0.60   7.0 0.80   9.5 1.00   12.0
Question Parts
(a)
Determine the spring constant k of the first spring (use any pair of data).
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