O-LevelPhysicsForces5054/21 · Oct/Nov 2019 · Q54 Marks
An electronic balance is calibrated to display the weight of an object that is placed on its top plate. Fig. 5.1 shows the balance with an empty measuring cylinder on the top plate. [Figure 5.1] A student pours a small quantity of oil into the measuring cylinder and records the volume and the new reading on the balance. Fig. 5.2 shows how the reading on the balance varies with the volume of oil in the measuring cylinder. [Figure 5.2] The gravitational field strength g is equal to 10N/kg. Using Fig. 5.2, determine the density of the oil.
- density =[4]
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Mark scheme
Marking points from the official mark scheme (Oct/Nov 2019). The mark or mark type is shown in brackets.
- [B1] two pairs of results from the line and separated by ≥ 50 cm³
- [C1] or (p) = m / V use of results to obtain gradient or any mass / corresponding volume
- [C1] W = mg or (p =) gradient/g or 0.00881 (N/cm³) < p < 0.00895 (N/cm³)
- [A1] 0.000881 kg/cm³ < p < 0.000895 kg/cm³ or 0.881 g/cm³ <p< 0.895 g/cm³
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