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Form 2 Physics Measurement II Questions and Video Answers
State the assumption made when calculating the size of a molecule in the oil drop experiment.
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1.
Name the instrument that would be most suitable for measuring the thickness of one sheet of this question paper.
2.
State the assumption made when calculating the size of a molecule in the oil drop experiment.
3.
The micrometer screw gauge represented by Fig. 1 has thimble scale of 50 divisions. What is the reading shown?
4.
The number of molecules in #18cm^3# of a liquid is #6 times 10^23#. Assuming that the diameter of the molecules is equivalent to the side of a cube having the same volume as the molecule. Determine the diameter of the molecule.
5.
What is the reading on the vernier calipers shown in Figure 1?
6.
You are provided with the following: A large shallow tray, water, lycopodium powder, some olive oil, either a piece of thin wire with a kink and a millimeter scale or a burette meter rule. Describe an experiment to estimate the diameter of a molecule of the olive oil.
7.
Figure 1 shows a micrometer screw gauge being used to measure the diameter of a metal rod. The thimble scale has 50 divisions. What is the reading shown?
8.
Figure 1 shows a micrometer screw gauge being used to measure the diameter of a ball bearing. A magnified portion of the scale is shown. Record the diameter of the ball bearing.
9.
Figure 3 shows part of an experimental set up for estimating the diameter of an oil molecule. (i) Describe how the oil patch is formed. (ii) In an experiment the diameter, a, of the patch was measured to be 200 mm for an oil drop of radius 0.25mm. Determine the diameter of the molecule of the oil. State why this is an estimate. (iii) Describe one method of determining the diameter of the oil
10.
Figure 1 shows a metal cube of mass 1.75g placed between the jaws of a micrometer screw gauge. The magnified portion of the scale is also shown. The reading on the gauge when the jaws were fully closed without the cube was 0.012 cm. use this information and the figure to answer questions 11 and 12. What is the length of the cube?
11.
Figure 1 shows a vernier calipers being used to measure the internal diameter of a tube. Record the diameter of the tube.
12.
When a drop of oleic acid of known volume is dropped on the surface of water in a large trough, it spreads out to form a large circular patch. State one assumption made when the size of the molecule of oleic is estimated by determining the area of the patch.
13.
State two environmental hazards that may occur when oil spills over a large surface area of the sea.
14.
Figure 1 shows parts of the main scale and vernier scale of vernier calipers. Record the reading indicated.
15.
Figure 1 shows a magnified scale of a micrometer screw gauge. Record the reading indicated.
16.
An oil drop of volume V #m^3# introduced on the surface of water spreads to form patch whose area is #Am^2#. Derive an expression for obtaining the diameter, d of a molecule of oil.
17.
Figure 1 shows part of the main scale of vernier calipers. Insert the vernier scale to the main scale, to show a reading of 3.14 cm
18.
When a drop of organic acid of known volume is dropped on the surface of water in a large trough, it spreads out to form a large circular patch. State one assumption made when the size of the molecule of the acid is estimated by determining the area of the patch.
19.
In order to determine the size of an oil molecule, a student performed an experiment using olive oil drops to make a circular patch of the oil on the surface of water in a water bath. State two assumptions made by the student during the calculations.
20.
(a) In an experiment to determine the size of an oil molecule, oil is placed on the surface of water after sprinkling lycopodium powder on it. (i) State two reasons why oil is used. (ii) State the function of the lycopodium powder. (iii) State any two assumptions that are made in this experiment. (iv) Explain why the oils spreads on the surface of water. (b) The following data was obtained from
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