Free KCSE Physics Topical Questions KNEC Standards

The figure below shows a path taken by a gas molecule moving from point x to z

16/10/2021

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The figure below shows a path taken by a gas molecule moving from point x to z

(a) Explain how this movement can be observed (1mk)

By strongly illuminating a suspension of pollen grains in water/dust particles in air or smoke cell

(b) State in full, the law of motion that governs movement from x to z (1mk)

A body continues in its state of rest or motion with uniform velocity unless acted upon by an external force

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K.C.S.E Physics Q & A - MODEL 2019PP1QN01

31/7/2020

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K.C.S.E Physics Q & A - MODEL 2019PP1QN01

A micrometer screw gauge has a -0.03 mm error. State the reading that is observed on the instrument when used to measure the diameter of a wire whose actual diameter is 0.38 mm.

answer

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

28/7/2020

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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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K.C.S.E Physics Q & A - MODEL 2015PP1QN01

24/7/2020

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K.C.S.E Physics Q & A - MODEL 2015PP1QN01

Figure 1 shows part of the main scale of a vernier callipers.

Insert the vernier scale to the main scale, to show a reading of 3.14 cm.

ANSWER

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K.C.S.E Physics Q & A - MODEL 2014PP1QN06

23/7/2020

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K.C.S.E Physics Q & A - MODEL 2014PP1QN06

An oil drop of volume V m³ introduced on the surface of water spreads to form a patch whose area is A m². Derive an expression for obtaining the diameter, d of a molecule of oil.

answer

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K.C.S.E Physics Q & A - MODEL 2014PP1QN02

23/7/2020

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K.C.S.E Physics Q & A - MODEL 2014PP1QN02

Figure 1 shows a magnified scale of a micrometer screw gauge.

Record the reading indicated.

answer

3.46 mm read from photograph.

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K.C.S.E Physics Q & A - MODEL 2013PP1QN01

22/7/2020

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K.C.S.E Physics Q & A - MODEL 2013PP1QN01

Figure 1 shows part of the main scale and vernier scale of a vernier callipers.

Record the reading indicated.

answer

5.32cm

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K.C.S.E Physics Q & A - MODEL 2012PP1QN01

20/7/2020

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K.C.S.E Physics Q & A - MODEL 2012PP1QN01

Figure 1 shows a measuring cylinder containing some water.

Determine the reading on the measuring cylinder, after three drops of water each of volume 0.6 cm3 are added.

ANSWER

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K.C.S.E Physics Q & A - MODEL 2010PP1QN09

19/7/2020

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K.C.S.E Physics Q & A - MODEL 2010PP1QN09

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/monolayer.

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K.C.S.E Physics Q & A - MODEL 2010PP1QN01

17/7/2020

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K.C.S.E Physics Q & A - MODEL 2010PP1QN01

Figure 1 shows a vernier calipers being used to measure the internal diameter of a tube.

Record the diameter of the tube.

answers

1.62cm

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K.C.S.E Physics Q & A - MODEL 2009PP1QN02

17/7/2020

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K.C.S.E Physics Q & A - MODEL 2009PP1QN02

In an experiment to determine the acceleration due to gravity g, a student measured the period, T and length L, of a simple pendulum. For a length L = 70.5 cm, the period T obtained as 1.7s. Given that T = 2phie √ L/g, determine the value of g correct to two significant figures

answer

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K.C.S.E Physics Q & A - MODEL 2009PP1QN01

16/7/2020

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K.C.S.E Physics Q & A - MODEL 2009PP1QN01

In an experiment to measure the density of a liquid, a student filled a burette with a liquid to the 0 cm3 mark. Figure 1 shows a section of the burette showing the level of the liquid after 54.5 g of the liquid had been run ou

Determine the density of the liquid

answer

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K.C.S.E Physics Q & A - MODEL 2008PP1QN02

15/7/2020

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K.C.S.E Physics Q & A - MODEL 2008PP1QN02

The masses of equal volumes of a certain liquid and of water were found to be m_v and m_w respectively. Given that the density of water is 1gcm^-3, express the density, p, of the liquid in terms of m_v m_w (show your work)

answer

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K.C.S.E Physics Q & A - MODEL 2007PP1QN01&02

14/7/2020

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K.C.S.E Physics Q & A - MODEL 2007PP1QN01&02

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 1 and 2

What is the length of the cube?
Determine the density of the metal cube giving your answer correct to three significant figures

ANSWERS

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K.C.S.E Physics Q & A - MODEL 2006PP1QN14

14/7/2020

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K.C.S.E Physics Q & A - MODEL 2006PP1QN14

(a) Distinguish between solid and liquid states of matter in terms of intermolecular forces
(b) In an experiment to estimate the diameter of an oil molecule, an oil drop of diameter 0.05 cm spreads over a circular patch whose diameter is 20 cm
Determine
(i) The volume of the oil drop
(ii) The area of the patch covered by the oil
(iii) The diameter of the oil molecule

ANSWER

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K.C.S.E Physics Q & A - MODEL 2005PP1QN01

12/7/2020

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K.C.S.E Physics Q & A - MODEL 2005PP1QN01

Figure 1 shows the reading on a burette after 55 drops of a liquid have been used.

If the initial reading was at Zero mark, determine the volume of one drop.

answer

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K.C.S.E Physics Q & A - MODEL 2004PP2QN01

12/7/2020

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K.C.S.E Physics Q & A - MODEL 2004PP2QN01

a) A test tube of uniform cross-section loaded so that it can float upright in water. With the aid of a labeled diagram, describe how the test tube may be calibrated to measure the density of liquid.

b) In an experiment to determine the density of a liquid, a uniform metal cylinder of cross-section area 6.2cm was hang from a spring balance and lowered gradually into the liquid. The up thrust was determined for various submerged lengths. The results obtained are shown on the graph in Fig 1.

Using graph, determine;
(i) The value of the up thrust when the cylinder is fully submerged
(ii) The Density of the liquid

answers

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K.C.S.E Physics Q & A - MODEL 2003PP1QN01

10/7/2020

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K.C.S.E Physics Q & A - MODEL 2003PP1QN01

Figure 1 shows a measuring cylinder containing some liquid

Another 5cm3 of the liquid is added into the cylinder. Indicate on the diagram the new level of the liquid.

answer

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K.C.S.E Physics Q & A - MODEL 2002PP1QN01

9/7/2020

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K.C.S.E Physics Q & A - MODEL 2002PP1QN01

Fig one shows a micrometer crew gauge being used to measure the diameter of a metal rod.
The thimble scale has 50 divisions

What is the reading shown?

answer

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K.C.S.E Physics Q & A - MODEL 1999PP1QN01

7/7/2020

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K.C.S.E Physics Q & A - MODEL 1999PP1QN01

What is the reading on the vernier calipers shown in figure 1?

ANSWER

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K.C.S.E Physics Q & A - MODEL 1998PP2QN02

7/7/2020

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K.C.S.E Physics Q & A - MODEL 1998PP2QN02

a) You are provided with two straight open tubes each about 1m long, a sound source, a sound detector and a reflecting surface. With the aid of a labeled diagram, describe an experiment to show that the angle of incidents is equal to reflection for sound waves.
b)Fig. 1 shows a block with a graduated side, and of dimension 4cm x4cm x 4cm x 16cm, just about to be lowered into a liquid contained in an overflow can.

During an experiment with this set-up, the following information was recorded;
-The block floated with three quarters of it submerged
-Initial reading of balance=0 grammes
-final reading of balance= 154 grammes.
Use the information to determine the density of the:
(i) Block (ii) Liquid
(Use g= 10ms2 . give your answers to 1 decimal place.)

ANSWERS

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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)

​(a) Explain how this movement can be observed (1mk)

​(b) State in full, the law of motion that governs movement from x to z (1mk)

K.C.S.E Physics Q & A - MODEL 2019PP1QN01

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

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 2016PP1QN03

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

K.C.S.E Physics Q & A - MODEL 2015PP1QN01

K.C.S.E Physics Q & A - MODEL 2014PP1QN06

An oil drop of volume V m3 introduced on the surface of water spreads to form a patch whose area is A m2. Derive an expression for obtaining the diameter, d of a molecule of oil.

K.C.S.E Physics Q & A - MODEL 2014PP1QN02

K.C.S.E Physics Q & A - MODEL 2013PP1QN01

K.C.S.E Physics Q & A - MODEL 2012PP1QN01

K.C.S.E Physics Q & A - MODEL 2010PP1QN09

K.C.S.E Physics Q & A - MODEL 2010PP1QN01

K.C.S.E Physics Q & A - MODEL 2009PP1QN02

K.C.S.E Physics Q & A - MODEL 2009PP1QN01

K.C.S.E Physics Q & A - MODEL 2008PP1QN02

The masses of equal volumes of a certain liquid and of water were found to be mv and mw respectively. Given that the density of water is 1gcm-3, express the density, p, of the liquid in terms of mv mw (show your work)

K.C.S.E Physics Q & A - MODEL 2007PP1QN01&02

K.C.S.E Physics Q & A - MODEL 2006PP1QN14

K.C.S.E Physics Q & A - MODEL 2005PP1QN01

K.C.S.E Physics Q & A - MODEL 2004PP2QN01

K.C.S.E Physics Q & A - MODEL 2003PP1QN01

K.C.S.E Physics Q & A - MODEL 2002PP1QN01

K.C.S.E Physics Q & A - MODEL 1999PP1QN01

K.C.S.E Physics Q & A - MODEL 1998PP2QN02

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(a) Explain how this movement can be observed (1mk)

(b) State in full, the law of motion that governs movement from x to z (1mk)

(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.

An oil drop of volume V m³ introduced on the surface of water spreads to form a patch whose area is A m². Derive an expression for obtaining the diameter, d of a molecule of oil.

The masses of equal volumes of a certain liquid and of water were found to be m_v and m_w respectively. Given that the density of water is 1gcm^-3, express the density, p, of the liquid in terms of m_v m_w (show your work)