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ST. JOSEPHS’ BOYS HIGH SCHOOL
FORM 4 TOPICAL EXAMS
MARCH 2008
TIME: I HOUR
TOPIC: MEASUREMENT
 Answer all questions in this paper.
 All working must be clearly shown.
1. Assuming that 1.0 x 10 -3 kg of copper contain about 9.0 x 10 21 atoms, and the density of copper
is about 9.0 gm -3, find the
a) mass of a copper atom.
( 2 Marks )
b) Volume occupied by the atom.
( 3 Marks )
2. State the number of significant figures in each of the following numbers :i)
20.7
ii)
40 000
iii)
0.0207
iv)
0.0200
3. Write the following numbers in standard form:
i)
2 840 000
ii)
0.000 00037
( 2 Marks )
2
iii)
1.7
iv)
0.1084
( 2 Marks )
4. In an experiment to determine the thickness of an oil molecule, a drop of oil of volume 10 -4 cm 3
spreads to an area of 300 cm 2. Calculate the thickness of the film assumed to be one molecule
thick.
( 3 Marks )
5. Record the actual diameter of the body below if the micrometer screw gauge being used has an
error of -0.12 mm.
( 2 Marks )
6. How many millimeters are there in 5 km?
( 1 Mark )
7. Atone of mass 120 g, dropped in water, caused levels before and after, as shown below. What is
the density of the stone?
( 3 Marks )
8. A rectangular tank is 2.6m long, 5.0 wide and 2.0 m high. What is the mass of water that will fill
it up to the brim?
( 3 Marks )
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9. An empty relative density bottle has a mass of 30 g. When completely filled with water its mass
is 59.0 g. What will be its mass if it is completely filled with an acid of relative density 1.20?
( 3 Marks )
10. The figure below shows the outline map of an island drawn to a scale of 1: 500 000. Estimate the
area of the island in square kilometers.
( 6 Marks )