Free KCSE Physics Topical Questions KNEC Standards

A turning effect of force depends on the magnitude of the force. State two other factors that determines the moment of a force

17/10/2021

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A turning effect of force depends on the magnitude of the force. State two other factors that determines the moment of a force (2mks)

Perpendicular distance away from the point
Angle at which the force is applied

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A crystal of potassium permanganate was carefully introduced at the bottom of water column held in a gas jar. After sometime, the whole volume of water was coloured. Explain this observation

17/10/2021

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A crystal of potassium permanganate was carefully introduced at the bottom of water column held in a gas jar. After sometime, the whole volume of water was coloured. Explain this observation (2mks)

The continuously moving water molecules hit the crystal from all directions causing it to split into the tiny particles of which it consist. The same movement caused the particles to diffuse to all parts of the liquid, this rendering the whole volume colored.

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Define crystal cleavage

17/10/2021

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Define crystal cleavage (1mk)

This is the phenomenon in which crystals break/fracture along specific planes to yield fresh smooth surface when hit or subjected to mechanical shock

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A u-tube vertically holds two liquids L1 and L2 as shown in the figure below

17/10/2021

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A u-tube vertically holds two liquids L1 and L2 as shown in the figure below

A u-tube vertically holds two liquids L1 and L2 as shown in the figure above

(a) Mark accurately the point in liquid L2 that is at the same pressure as point P (1mk)

AT the same level as O in the right limb

(b) Determine the number of times L1 is denser than L2 (2mks)

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The bob in the figure above is deflected then released to oscillate. State and explain one factor that will determine whether the string breaks or not

17/10/2021

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The bob in the figure above is deflected then released to oscillate. State and explain one factor that will determine whether the string breaks or not (2mks)

The angle to which the bob is deflected.
The larger the angle the higher the velocity at the lowest position, hence the greater arising from centripetal force

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A single pendulum consisting of a heavy bob and string is suspended in air as shown in the figure below

16/10/2021

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A single pendulum consisting of a heavy bob and string is suspended in air as shown in the figure below

Mark on the diagram and name one other force acting on the bob.

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An object weighs 2.6 N in air and 2.2N when completely immersed in water. Determine the relative density of the object

16/10/2021

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An object weighs 2.6 N in air and 2.2N when completely immersed in water. Determine the relative density of the object (2mks)

Solution

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Complete the figure below to show how a single pulley can be arranged to a velocity ratio(V.R) of 2

16/10/2021

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Complete the figure below to show how a single pulley can be arranged to a velocity ratio(V.R) of 2 (2mks)

Complete the figure below to show how a single pulley can be arranged to a velocity ratio(V.R) of 2

Solved ...

a single pulley arranged to a velocity ratio(V.R) of 2

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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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State one factor that a bimetallic strip relies on for its working

16/10/2021

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State one factor that a bimetallic strip relies on for its working

Difference in expansion rates of materials

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K.C.S.E Physics Q & A - MODEL 2019PP2QN19

15/10/2020

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K.C.S.E Physics Q & A - MODEL 2019PP2QN19

(a) Define half life as used in radioactivity.
(b) Figure 13 shows a device used to detect radioactivity by forming tracks when air is ionised.

(i) State the name of the device shown.
(ii) State how air in the device gets ionised.
(iii) Describe how tracks are formed
(c) (i) State two factors that determine the speed of the photoelectrons emitted from a metal surface
(ii) The energy of a photon of light is 2.21 eV. (electronic charge is 1.6x10^-19C and planks constant h is 6.63x10^-34Js)
I. Express this energy in joules.
II. Determine the frequency of the light that produces the photon.

answers

(a) Half life is the time taken for half the number of nuclides initially present in a sample to decay
(b). (ii) Expansion closed chamber
(ii) Due to collisions between the molecules from the radiations source and the air molecules
(iii) When the piston is pulled down air expands hence cools.
(c)(i) The work function of the metal
Energy of incident radiation frequency/wavelength

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K.C.S.E Physics Q & A - MODEL 2019PP1QN18

31/7/2020

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K.C.S.E Physics Q & A - MODEL 2019PP1QN18

(a) Figure 9 shows a graph of pressure against temperature for a fixed mass of gas at constant volume.

From the graph, determine the values of n arid e given that P = nT + c where n and c are constants.
(b) Explain why it is not possible to obtain zero pressure of a gas in real life situation.
(c) A fixed mass of a gas occupies 1.5 X 10^-3 m^-3 at a pressure of 760 mmHg and a temperature of 273 K. Determine the volume the gas will occupy at a temperature of 290K and a pressure of 720 mmHg.
(d) State any three assumptions made in kinetic theory of gases.

answers

(b) It is not possible to reduce the pressure of a gas to zero since by then most of the temperatures are very low hence the gas liquefies.

(d) Assumptions of the kinetic theory of gases:
Attraction of between the molecules is negligible.
Volume of the molecule is negligible compared to the volume of the container occupied by the gas.
The molecules undergo elastic collisions.
The length of time of a collision is negligible compared to the time between collisions.

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K.C.S.E Physics Q & A - MODEL 2019PP1QN17

31/7/2020

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K.C.S.E Physics Q & A - MODEL 2019PP1QN17

(a) State what ¡s meant by Brownian Motion.
(b) Figure 8 shows the graph of velocity against time For a small steel ball Falling in a viscous liquid.

(a) State what ¡s meant by Brownian Motion. (1 mark) (b) Figure 8 shows the graph of velocity against time For a small steel ball Falling in a viscous liquid. (i) Describe the motion of the steel ball as represented by part OA (ii) Explain why the velocity of A and B is constant (c)A student throws a tennis ball vertically upwards from the ground and it lands back after 8 seconds.( acceleration due to gravity g =10ms-2) Determine the: (i) maximum height reached by the ball iii) velocity with which the ball hits the ground. (3 marks)

(i) Describe the motion of the steel ball as represented by part OA
(ii) Explain why the velocity of A and B is constant
(c)A student throws a tennis ball vertically upwards from the ground and it lands back after 8 seconds.( acceleration due to gravity g =10m/s2)
Determine the:
(i) maximum height reached by the ball
iii) velocity with which the ball hits the ground.

answers

(a) Continuous random motion of particles.
(b) (i) It accelerates, velocity increases.
(ii) As the ball falls through the fluid, the Viscous drag increases until the sum of the Viscous drag and the upthrust becomes equal the weight of the steel ball, hence the resultant force becomes zero.

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K.C.S.E Physics Q & A - MODEL 2019PP1QN16

31/7/2020

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K.C.S.E Physics Q & A - MODEL 2019PP1QN16

(a) State the meaning of the term “heat capacity.”
(b) State how pressure affects the melting point of a substance.
(c)Figure 7 shows a set tip of apparatus that may be used to apparatus the specific latent heat of vaporization of steam

(I) Describe how the mass of condensed steam is determined.
(ii) Other than mass and time, state two other measurements that should be taken during the experiment.
(iii) Show how the measurements in (c)(ii) can be used to determine the specific latent heat of vaporization of water.
(iv) State the precaution that should be taken so that the mass of the condensed steam measured corresponds to the actual mass of steam collected during the time recorded in the experiment
(v) State why it is not necessary to measure temperature in in the set up

answers

(a) Heat capacity is the quantity of heat energy required to raise the temperature of a substance by 1K.
(b) - Increase in pressure lowers the melting point while decrease in (1 mark) pressure raises/increases the melting point.
(c) (i) - Measure the mass of the empty beaker M1.
Measure the mass of the beaker plus the condensed steam M2
Get the difference between the two masses (M2 —M1) = M
(ii) - Voltage
Current

(iv) - Start timing when the steam drops start forming out steadily and Stop immediately the beaker is withdrawn.
(V) Steam is produced at boiling point where temperature is constant.

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K.C.S.E Physics Q & A - MODEL 2019PP1QN15

31/7/2020

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K.C.S.E Physics Q & A - MODEL 2019PP1QN15

(a)Figure 6 shows n bottle top opener being used to open a bottle.

Indicate on the diagram the direction of the load and the effort.
(b) State two ways ¡n which an inclined plane can be made to reduce the applied effort when pulling a Load along the plane.
(c) A block and tackle system has three pulleys in the upper fixed block and two pulleys in the lower movable block.
(i) Draw a diagram to show how the system can be set up in order to lift a load arid indicate the position of the load and effort.
(ii) State the velocity ratio of the set up.
(iii) In such a block and tackle system an effort of 200N is required to lift a load of 600N. Determine its efficiency

answers

(b)Reducing the angle of inclination.
Reducing the friction — using rollers, lubricants etc.

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K.C.S.E Physics Q & A - MODEL 2019PP1QN14

31/7/2020

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K.C.S.E Physics Q & A - MODEL 2019PP1QN14

(a) A student is provided with five 20g masses, a meter rule, a spring with a pointer, a stand a boss and a clamp.
(i) In the space provided, sketch a labelled diagram of the set up that may be used in order to verify Hooke’s law using these apparatus.
(ii) State two measurements that should be recorded in order to plot a suitable graph so as to verify Hooke’s law.
(iii) Describe how the measurements made in (ii) can be used to determine the spring constant.

(b) A helical spring stretches by 0.6cm when Supporting a weight of 40 g. Determine the extension when the same spring Supports a weight of 65 g.

answers

(ii) Force due to total mass hung.
Extension produced by hanging masses.
(iii) — Plot a graph of force against extension.
Determines the slope of the graph

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K.C.S.E Physics Q & A - MODEL 2019PP1QN13

31/7/2020

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K.C.S.E Physics Q & A - MODEL 2019PP1QN13

Two boxes E and F of masses 2.0 kg and 4.0 kg respectively arc dragged along a frictionless surface using identical forces. State with a reason which box moves with a higher velocity.

answer

E (20N)
F = Ma, the smaller the mass, the higher the acceleration

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K.C.S.E Physics Q & A - MODEL 2019PP1QN12

31/7/2020

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K.C.S.E Physics Q & A - MODEL 2019PP1QN12

Figure 5 shows two springs C and D of the same length and equal number of turns made from the same wire.

State with a reason which of the two springs can support a heavier load before attaining the elastic limit.

answer

C
It has a smaller diameter hence a higher spring constant.

2 Comments

K.C.S.E Physics Q & A - MODEL 2019PP1QN11

31/7/2020

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K.C.S.E Physics Q & A - MODEL 2019PP1QN11

A stone of volume 800 cm³ experiences an upthrust of 6.5N when fully immersed in a certain liquid. Determine the density of the liquid.

answer

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K.C.S.E Physics Q & A - MODEL 2019PP1QN10

31/7/2020

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K.C.S.E Physics Q & A - MODEL 2019PP1QN10

For a fluid flowing at a velocity V in a tube of cross-sectional area A, VA =constant. State two assumptions made in deriving this equation.

answer

The assumptions are: the fluid is

(i) flowing steadily,
(ii) incompressible,
(iii) non-Viscous.

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State the meaning of the term “radian” as a Unit of measurement.

31/7/2020

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K.C.S.E Physics Q & A - MODEL 2019PP1QN09

State the meaning of the term “radian” as a Unit of measurement.

answer

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K.C.S.E Physics Q & A - MODEL 2019PP1QN08

31/7/2020

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K.C.S.E Physics Q & A - MODEL 2019PP1QN08

Figure 4 shows a one meter long uniform rod of negligible weight supporting two weights.

Determine the position of the fulcrum from 0 cm for the rod to remain in equilibrium.

answer

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A student carrying a heavy box using the right hand is observed to lean towards the left hand side. Explain this observation.

31/7/2020

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K.C.S.E Physics Q & A - MODEL 2019PP1QN07

A student carrying a heavy box using the right hand is observed to lean towards the left hand side. Explain this observation.

answer

The box shifts the position of the center of gravity of the system towards the right hand to maintain equilibrium. The student leans in the opposite direction.

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K.C.S.E Physics Q & A - MODEL 2019PP1QN06

31/7/2020

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K.C.S.E Physics Q & A - MODEL 2019PP1QN06

On the axes provided, sketch a displacement — time graph for a trolley moving down a frictionless inclined plane till it reaches the end of the incline.

answer

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K.C.S.E Physics Q & A - MODEL 2019PP1QN05

31/7/2020

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K.C.S.E Physics Q & A - MODEL 2019PP1QN05

Figure 3 shows two metal rods A and B of equal length made of the same material but different diameters wax is attached at one end of each rod. A source of heat is placed between the two metal rods.

State with a reason, what is observed on the wax.

answer

Wax on rod B drops off first.
The thicker rod conducts heat faster than the thinner one.

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​A turning effect of force depends on the magnitude of the force. State two other factors that determines the moment of a force (2mks)

​A crystal of potassium permanganate was carefully introduced at the bottom of water column held in a gas jar. After sometime, the whole volume of water was coloured. Explain this observation (2mks)

​Define crystal cleavage (1mk)

​(a) Mark accurately the point in liquid L2 that is at the same pressure as point P (1mk)

(b) Determine the number of times L1 is denser than L2 (2mks)

​The bob in the figure above is deflected then released to oscillate. State and explain one factor that will determine whether the string breaks or not (2mks)

​Mark on the diagram and name one other force acting on the bob.

​An object weighs 2.6 N in air and 2.2N when completely immersed in water. Determine the relative density of the object (2mks)

Solution

Complete the figure below to show how a single pulley can be arranged to a velocity ratio(V.R) of 2 (2mks)

Solved ...

​(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)

​State one factor that a bimetallic strip relies on for its working

K.C.S.E Physics Q & A - MODEL 2019PP2QN19

K.C.S.E Physics Q & A - MODEL 2019PP1QN18

K.C.S.E Physics Q & A - MODEL 2019PP1QN17

K.C.S.E Physics Q & A - MODEL 2019PP1QN16

K.C.S.E Physics Q & A - MODEL 2019PP1QN15

K.C.S.E Physics Q & A - MODEL 2019PP1QN14

K.C.S.E Physics Q & A - MODEL 2019PP1QN13

K.C.S.E Physics Q & A - MODEL 2019PP1QN12

K.C.S.E Physics Q & A - MODEL 2019PP1QN11

A stone of volume 800 cm3 experiences an upthrust of 6.5N when fully immersed in a certain liquid. Determine the density of the liquid.

K.C.S.E Physics Q & A - MODEL 2019PP1QN10

State the meaning of the term “radian” as a Unit of measurement.

K.C.S.E Physics Q & A - MODEL 2019PP1QN08

A student carrying a heavy box using the right hand is observed to lean towards the left hand side. Explain this observation.

K.C.S.E Physics Q & A - MODEL 2019PP1QN06

K.C.S.E Physics Q & A - MODEL 2019PP1QN05

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A turning effect of force depends on the magnitude of the force. State two other factors that determines the moment of a force (2mks)

A crystal of potassium permanganate was carefully introduced at the bottom of water column held in a gas jar. After sometime, the whole volume of water was coloured. Explain this observation (2mks)

Define crystal cleavage (1mk)

(a) Mark accurately the point in liquid L2 that is at the same pressure as point P (1mk)

The bob in the figure above is deflected then released to oscillate. State and explain one factor that will determine whether the string breaks or not (2mks)

Mark on the diagram and name one other force acting on the bob.

An object weighs 2.6 N in air and 2.2N when completely immersed in water. Determine the relative density of the object (2mks)

(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)

State one factor that a bimetallic strip relies on for its working

A stone of volume 800 cm³ experiences an upthrust of 6.5N when fully immersed in a certain liquid. Determine the density of the liquid.