neco model questions vol1 2017 physics | Practical

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Question 1 View Details
An irregular solid metal specimen is to be investigated for its density using the water‑displacement method. The mass of the dry specimen is measured with a balance and recorded. The specimen is then gently immersed in a graduated cylinder containing water and the rise in water level is noted.
Question Parts
(a)
Calculate the volume of the specimen from the water‑displacement readings.
(b)
Determine the density of the specimen in g cm⁻³.
(c)
The true density of the metal is known to be 8.50 g cm⁻³. Calculate the percentage error of the experimental value.
(d)
State two possible sources of error in this experiment and suggest one way to minimise each.
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Question 2 View Details
A force table is set up to investigate the addition of two forces acting at a point. Two force vectors are applied using hanging masses and pulleys as follows: - Force F₁: magnitude 5 N acting 30° north of east. - Force F₂: magnitude 8 N acting 120° measured anticlockwise from east. The student is required to determine the magnitude and direction of the resultant force.
Question Parts
(a)
Resolve each force into its horizontal (east‑west) and vertical (north‑south) components.
(b)
Obtain the horizontal and vertical components of the resultant force and then calculate its magnitude (to 2 d.p.) and direction measured north of east (to the nearest degree).
(c)
State whether the resultant obtained is a scalar or a vector and justify your answer.
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Question 3 View Details
A student investigates the motion of a steel ball falling freely using a ticker timer that marks at a frequency of 50 Hz (i.e. one tick every 0.02 s). The ball is released from rest at the top of a vertical track. The distances measured from the release point after each successive tick are given in the table below. | Tick (n) | Distance from release point (cm) | |----------|----------------------------------| | 1 | 0.2 | | 2 | 0.8 | | 3 | 1.8 | | 4 | 3.1 | | 5 | 4.9 | | 6 | 7.1 | | 7 | 9.8 | | 8 | 12.5 | | 9 | 15.9 | |10 | 19.6 | Using the data, the student is required to analyse the motion of the ball.
Question Parts
(a)
Plot distance (s) against the square of time (t²) and determine the acceleration of the ball. Show how the gradient of the straight‑line graph is used to obtain the value of a.
(b)
Compare the experimental acceleration with the accepted value of g = 9.8 m s⁻² and calculate the percentage error.
(c)
State two possible sources of systematic error in this experiment and suggest one method to minimise each error.
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Question 4 View Details
A student is to determine the spring constant (k) of a helical spring using a set of standard masses and a spring balance. The spring is hung vertically from a fixed support. The masses are added one at a time and the extension of the spring is read from a scale attached to the spring. The data obtained are shown below. | Mass (kg) | Extension (cm) | |-----------|----------------| | 0.10 | 2.5 | | 0.20 | 5.0 | | 0.30 | 7.5 | | 0.40 |10.0 | | 0.50 |12.5 | The student then hangs an unknown weight on the same spring and records an extension of 6.0 cm. Assume g = 9.8 m s⁻². The uncertainties are ±0.01 kg in each mass and ±0.1 cm in each extension reading.
Question Parts
(a)
Using the data, plot the applied force (F) against the extension (x) and determine the spring constant k. Show the calculation of the gradient and give k in N m⁻¹.
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