This document contains a physics exam for a student with 17 questions covering topics of basic quantities, measurement of length, errors in measurement, density, forces, and vector/scalar quantities. The student is instructed to answer all questions in the sheets provided. The questions require the student to define terms, perform calculations, distinguish between concepts, and describe processes.
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3. Name two types of errors and state how each is minimized when measuring the length of objects. (4 mks)
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4. Describe how you would estimate the thickness of one paper in a given book if you are provided with a metre
ruler only (3 mks)
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5. State three limitations of using the displacement method when determining the volume of an irregular solid
(3 mks)
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6. A wire of radius 6 mm and length 400 is melted into a sphere. Calculate the radius of the sphere in centimeters.
(3 mks)
7. Convert 5 g/cm3
to the SI unit. (2 mks)
8. Using the following masses and volumes of substances, calculate their densities in SI unit.
a) 200 mg, 0.0004m3
(2 mks)
3. b) 0.86 kg, 1000000 mm3
(2 mks)
9. 100 cm3
of water is mixed with 50 cm3
of concentrated acid of density 1.2 g/cm3
. Assuming no change in volume,
find the average density of the mixture. (Take density of water = 1.0 g/cm3
) (4 mks)
10. A density bottle weighs 70 g when filled with water and 94 g when filled with a liquid A. Find the density of liquid
A given that the density of water is 1000 kg/m3
. (5 mks)
11. State four effects of forces (4 mks)
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12. State three types of forces that act between objects that are not in contact (3 mks)
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13. Describe two types of molecular forces (4 mks)
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15. State three areas of application of capillary rise. (3 mks)
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16. Distinguish between mass and weight and state SI units (4 mks)
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17. Differentiate between vector quantities and scalar quantities (2 mks)
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