Free KCSE Physics Topical Questions KNEC Standards

K.C.S.E Physics Q & A - MODEL 2018PP1QN03

28/7/2020

K.C.S.E Physics Q & A - MODEL 2018PP1QN03

Describe how the knowledge of the oil drop experiment may be used to estimate the area of oil spillage from a ship in the sea assuming the surface water is not disturbed.

answer

- Using the same oil spilled, to measure a known volume.
- Determine the area of spread of the measured volume (on the same water (sample).
- Estimate the area of spread on the sea.

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K.C.S.E Physics Q & A - MODEL 2017PP1QN16

28/7/2020

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K.C.S.E Physics Q & A - MODEL 2017PP1QN16

(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 oil spreads on the surface of water.

(b) The following data was obtained from an experiment to determine the size of a palm oil molecule.
— Volume of 100 drops of palm oil = 15.0mm³
— Area of a patch from one drop of oil = 8.0 X 10⁴ mm²
Determine the size of a palm oil molecule.

answers

(a) (i) Oil doesn’t mix with water.
Oil is less dense hence floats on the water surface.
(ii) To show boundary of the oil patch clearly, for measurements to be taken.
(iii) The oil drops is a perfect sphere.
The patch is monolayer.
The patch is a perfect circIe
Molecular diameter is uniform.
(iv) The oil breaks the surface tension V making the patch to form a perfect circle.

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K.C.S.E Physics Q & A - MODEL 2017PP1QN01

27/7/2020

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K.C.S.E Physics Q & A - MODEL 2017PP1QN01

In order to determine the size of an oil molecule, a student performed an experiment using five
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.

answer

The patch was monolayer.
The patch was a perfect cylinder.
Molecular diameter is uniform.
The patch is a perfect circle.

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K.C.S.E Physics Q & A - MODEL 2016PP1QN03

26/7/2020

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K.C.S.E Physics Q & A - MODEL 2016PP1QN03

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 acid is estimated by determining the area of the patch.

answer

Drop spreads out until the patch is one molecule thick

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K.C.S.E Physics Q & A - MODEL 2015PP1QN02

24/7/2020

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K.C.S.E Physics Q & A - MODEL 2015PP1QN02

Figure 2 (a) shows the initial reading of a burette used to measure the volume of oil. After 50 drops of the oil were run out, the final reading was as shown in . Figure 2 (b)

Determine the volume of one drop of oil.

ANSWER

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FORM I - PHYSICS SYLLABUS

Introduction to Physics (4 Lessons)
Measurements 1 (12 Lessons)
Force (16 Lessons)
Pressure (24 Lessons)
Particulate Nature of Matter (12 Lessons)
Thermal Expansion (12 Lessons)
Heat Transfer
Rectilinear Propagation of Light and Reflection at Plane Surface (16 Lessons)
Electrostatics (12 Lessons)
Cells and Simple Circuits (12 Lessons)

FORM II - PHYSICS SYLLABUS

Magnetism (12 Lessons)
Measurements II (16 Lessons)
Turning Effect of Force (10 Lessons)
Equilibrium Centre of Gravity (12 Lessons)
Reflection at Curved Surfaces (16 Lessons)
Magnetic Effect of Electric Current (18 Lessons)
Hooke's Law (8 Lessons)
Waves (14 Lessons)
Sound (12 Lessons)
Fluid Flow (14 Lessons)

FORM III - PHYSICS SYLLABUS

Linear Motion (20 Lessons)
Refraction of Light (20 Lessons)
Laws of Motion (15 Lessons)
Energy, Power and Machines (20 Lessons)
Current Electricity (20 Lessons)
Waves II(10 Lessons)
Electrostatics II (15 Lessons)
Heating Effect of Electric Current (10 Lessons)
Quantity of Heat (20 Lessons)
Gas Laws (15 Lessons)

FORM IV - PHYSICS SYLLABUS

Thin Lenses (20 Lessons)
Uniform Circular Motion (10 Lessons)
Floating and Sinking (15 Lessons)
Electromagnetic Spectrum (15 Lessons)
Electromagnetic Induction (20 Lessons)
Mains Electricity (10 Lessons)
Cathode Rays and Cathode Ray Tube (10 Lessons)
X-rays (8 Lessons)
Photoelectric Effect (15 Lessons)
Radioactivity (15 Lessons)
Electronics (10 Lessons)

K.C.S.E Physics Q & A - MODEL 2018PP1QN03

K.C.S.E Physics Q & A - MODEL 2018PP1QN03

K.C.S.E Physics Q & A - MODEL 2017PP1QN16

K.C.S.E Physics Q & A - MODEL 2017PP1QN16

(b) The following data was obtained from an experiment to determine the size of a palm oil molecule.
— Volume of 100 drops of palm oil = 15.0mm³
— Area of a patch from one drop of oil = 8.0 X 10⁴ mm²
Determine the size of a palm oil molecule.

K.C.S.E Physics Q & A - MODEL 2017PP1QN01

K.C.S.E Physics Q & A - MODEL 2017PP1QN01

K.C.S.E Physics Q & A - MODEL 2016PP1QN03

K.C.S.E Physics Q & A - MODEL 2016PP1QN03

K.C.S.E Physics Q & A - MODEL 2015PP1QN02

K.C.S.E Physics Q & A - MODEL 2015PP1QN02

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K.C.S.E Physics Q & A - MODEL 2018PP1QN03

K.C.S.E Physics Q & A - MODEL 2018PP1QN03

K.C.S.E Physics Q & A - MODEL 2017PP1QN16

K.C.S.E Physics Q & A - MODEL 2017PP1QN16

(b) The following data was obtained from an experiment to determine the size of a palm oil molecule. — Volume of 100 drops of palm oil = 15.0mm3 — Area of a patch from one drop of oil = 8.0 X 104 mm2 Determine the size of a palm oil molecule.

K.C.S.E Physics Q & A - MODEL 2017PP1QN01

K.C.S.E Physics Q & A - MODEL 2017PP1QN01

K.C.S.E Physics Q & A - MODEL 2016PP1QN03

K.C.S.E Physics Q & A - MODEL 2016PP1QN03

K.C.S.E Physics Q & A - MODEL 2015PP1QN02

K.C.S.E Physics Q & A - MODEL 2015PP1QN02

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FORM I - PHYSICS SYLLABUS

FORM II - PHYSICS SYLLABUS

FORM III - PHYSICS SYLLABUS

FORM IV - PHYSICS SYLLABUS

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HIGH SCHOOL RESOURCES

PRIMARY SCHOOL RESOURCES 8-4-4

PRIMARY SCHOOL RESOURCES CBC

COLLEGE RESOURCES

FREE NOVELS

Send Us a Message

(b) The following data was obtained from an experiment to determine the size of a palm oil molecule.
— Volume of 100 drops of palm oil = 15.0mm³
— Area of a patch from one drop of oil = 8.0 X 10⁴ mm²
Determine the size of a palm oil molecule.