Free KCSE Physics Topical Questions KNEC Standards

K.C.S.E Physics Q & A - MODEL 2002PP2QN07

10/7/2020

K.C.S.E Physics Q & A - MODEL 2002PP2QN07

a) Fig. 8 shows ultra violet light striking a polished zinc plate placed on a negatively charged gold – leaf electroscope.

Explain the following observations
i) The leaf of the electroscope falls.
ii) When the same experiment was repeated with a positively charged electroscope the leaf did not fall.
bi) State two factors which determine the speed of photoelectrons emitted by a metal surface
ii) In an experiment using a photocell, u, v. light of varying frequency but constant intensity was made to strike a metal surface. The maximum kinetic energy (K.E max)of photoelectrons for each frequency, was measured. The graph shows how KE max varies with f

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K.C.S.E Physics Q & A - MODEL 2002PP2QN06

10/7/2020

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K.C.S.E Physics Q & A - MODEL 2002PP2QN06

a) State the law that relates the volume of a gas to the temperature of a gas.
b) Fig 7. shows an experiment set-up that may be used to investigate one of the laws. The glass tube has a uniform bore and it is graduated in millimeter

i) Describe how the experiment was carried out and explain how the results obtained verify the law.
ii) Limitations of the set up are?
c) In an experiment to find the relation between pressure, p, and temperature, of a gas at a constant volume, values of temperature were determined. The results obtained are shown in the graph below.

(i) From the graph, determine the pressure at a temperature of 273K.
(ii) Assuming the relation p/T0+0 = constant holds for this graph determine the value of the constant T0

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K.C.S.E Physics Q & A - MODEL 2002PP2QN05

10/7/2020

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K.C.S.E Physics Q & A - MODEL 2002PP2QN05

a) Fig 6.1 shows the cross- section of a ripple tank full of water. A piece of cork floats on the surface of the water as shown. Fig 6 II shows the water surface viewed from above. A straight edge vibrator placed at the end A of ripple tank generates water waves, which travel towards end B as shown.

(i) Identify the type of waves generated on the water surface.
(ii) It is observed that as the waves pass the cork, there is no net movement on the cork. Explain this observation
(iii) A student estimates that successive waves pass the cork every 0.20 seconds. If the speed of the waves is 0.30 ms^-1 , determine the frequency and wavelength of the waves at that point.
iv) In the space provided, sketch the wave fronts as viewed from a point above the ripple tank.

v) Explain the answer in part (iv) above
b) A tuning fork is sounded at the mouth of a pipe whose one end is closed with a moveable piston. Resonance is observed successively when the piston is 77cm and then at 129 cm. If the speed of sound in air is 340ms ^-1, determine the frequency of the tuning fork.

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K.C.S.E Physics Q & A - MODEL 2002PP2QN04

10/7/2020

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K.C.S.E Physics Q & A - MODEL 2002PP2QN04

a) Fig 5. Shows the variation of temperature, T (0C), with time, t (seconds). When frozen water is heated for sometime

(i) Explain the shape of the curve at the parts labeled AB and C.
(ii) It is observed that when the temperature starts to rise, the volume initially decreases and then increases. State the reason for this observation.
(iii) In the fig. 5 sketch and explain the curve that would be obtained if frozen water was used. (Hint: specific heat capacity for seawater is lower what of fresh water.
(b) Determine the quantity of heat energy required to change 3.0 kg of ice at 0 C to water at 5 °C Specific latent heat of fusion of ice is 3.36 x 10⁵J/kg. Specific heat capacity of water is 4200J/kgK)

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K.C.S.E Physics Q & A - MODEL 2002PP2QN03

10/7/2020

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K.C.S.E Physics Q & A - MODEL 2002PP2QN03

Fig. 4 shows a block of a mass 30.0 kg being pulled up a slope by a force P at a constant speed. The friction force on the block is 20.0N

a i) On the same figure name and indicate the other forces acting on the block.
ii) Determine the component of the weight acting on the trolley down the slope
iii) Determine the value of P.
b) On reaching the top of the slope, the block is left to run freely down the slope.
i) Which one of the forces previously acting on the block would then act in the opposite?
ii) Determine the acceleration of the block down the slope.
iii) What is the effect of increasing the angle of slope on your answer in (ii) above.

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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 2002PP2QN07

K.C.S.E Physics Q & A - MODEL 2002PP2QN07

K.C.S.E Physics Q & A - MODEL 2002PP2QN06

K.C.S.E Physics Q & A - MODEL 2002PP2QN06

K.C.S.E Physics Q & A - MODEL 2002PP2QN05

K.C.S.E Physics Q & A - MODEL 2002PP2QN05

K.C.S.E Physics Q & A - MODEL 2002PP2QN04

K.C.S.E Physics Q & A - MODEL 2002PP2QN04

K.C.S.E Physics Q & A - MODEL 2002PP2QN03

K.C.S.E Physics Q & A - MODEL 2002PP2QN03

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FORM I - PHYSICS SYLLABUS

FORM II - PHYSICS SYLLABUS

FORM III - PHYSICS SYLLABUS

FORM IV - PHYSICS SYLLABUS

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