Free KCSE Physics Topical Questions KNEC Standards

K.C.S.E Physics Q & A - MODEL 2001PP2QN07

9/7/2020

K.C.S.E Physics Q & A - MODEL 2001PP2QN07

ai) State the pressure law of an ideal gas.
ii) The pressure p, of a fixed mass of a gas at constant temperature T= 300K is varied continuously. The corresponding values of P and the volume V of the gas are shown in table 2.

Given that PV = 2RT where R is a constant, plot an appropriate graph and use it to determine r.

b) A tin closed with an airtight lid contains air at a pressure of 1.0 x 10⁵+ Pa and temperature of 12 C. The tin is heated in a water bath until the lid opens. If the temperature at which the lid opens is 88C, determine the pressure attained by the gas. (Ignore expansion of the tin).

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K.C.S.E Physics Q & A - MODEL 2001PP2QN06

9/7/2020

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K.C.S.E Physics Q & A - MODEL 2001PP2QN06

a i) State one of the Newton's law of motion
ii) A body resting on a horizontal surface is given an initial velocity V so that it slides on the surface for some distance before coming to a stop. Table I shows the distances d moved by the body of various values of u

Given that v2 is 20 (miu)d where u is a constant for the surface, plot a appropriate graph and use it to determine u.
Determine values of u on table.
b) A train of mass 200 tonnes starts from rest and accelerates uniformly at 0.5ms-2 determine its momentum after moving 100m.

answer

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K.C.S.E Physics Q & A - MODEL 2001PP2QN05

9/7/2020

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K.C.S.E Physics Q & A - MODEL 2001PP2QN05

a) You are provided with 12V a.c source, four diodes and resistor.
i) Draw a circuit diagram for a full wave rectifier and show the points at which the output is taken.
AC source shown-symbols; arrangement of diode (one for each pair); correct position of R; correct position of output.
ii) Sketch the graph of the output when a capacitor is put in parallel with the resistor in the circuit in (i) above.

b) A certain transistor is connected in common-emitter-mode. The base current IB is 0.50 ma. Determine the values of the:
(i) Emitter current IE.
(ii) Base-collector current gain beta
(iii) Current gain alpha

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K.C.S.E Physics Q & A - MODEL 2001PP2QN04

9/7/2020

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K.C.S.E Physics Q & A - MODEL 2001PP2QN04

Fig 3 shows the main features of a cathode ray tube (CRT) of a cathode ray oscilloscope (CRO)

i) Describe how the electrons are produced in the tube.
ii) State and explain the function of the grid.
iii) State what would be observed on the screen if an a.c voltage is connected across the y-plates.
iv) State how the deflection system of a television differs fro that of a CRO.
v) Give the reason why it is possible to have a wider screen in the television set than on the C.R.O.
b) In an excited hydrogen atom. An electron moves from an energy level of -1.36 x 10 ^-19J. Determine the wavelength of the radiation emitted. (Planks constant h= 6.63 x 10^-34 Js and speed of light c= 3.0 x 108 ms^-1).

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K.C.S.E Physics Q & A - MODEL 2001PP2QN03

9/7/2020

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K.C.S.E Physics Q & A - MODEL 2001PP2QN03

a) a hole of area 2.0 cm2 at the bottom of a tank 2.0m deep is closed with a cork. Determine the force on the cork when the tank is filled with water. (Density of water is 1000kg/m3 and acceleration due to gravity is 10m/s2).

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K.C.S.E Physics Q & A - MODEL 2001PP2QN02

9/7/2020

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K.C.S.E Physics Q & A - MODEL 2001PP2QN02

a) Fig 1 (a) shows the circuit of a simple telephone receiver. When the telephone is lifted, a steady current flows through the solenoids. When a person speaks into the microphone on the other side, a varying current flows. These two currents are shown in fig. 1(b).

i) State the reason why solenoids are wounds in opposite directions around the soft-iron core pieces as shown.
ii) Explain how the speech current from the microphone is converted into sound in the receiver.
iii) State and explain the effect of replacing the soft iron core pieces with steel core pieces.
b) A step down transformer has 400 turns in the primary coil and 20 turns in the secondary coil A 50 ohms resister is connected to the secondary output. If the r.m.s (root-mean-square) value of the primary voltage is 240; determine the peak value of the current in the in the secondary circuit.

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K.C.S.E Physics Q & A - MODEL 2001PP2QN01

9/7/2020

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K.C.S.E Physics Q & A - MODEL 2001PP2QN01

A block of ice of mass 40g at 0C is placed in a calorimeter containing 400g of water at 20C .Ignoring the heat absorbed by the calorimeter, determine the final temperature of the mixture after all the ices has melted. (Specific latent heat capacity of fusion of ice= 340,00J/kg, specific heat capacity of water = 4,200j/kg).

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K.C.S.E Physics Q & A - MODEL 2001PP1QN34

9/7/2020

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K.C.S.E Physics Q & A - MODEL 2001PP1QN34

The following reaction is part of a radioactive series:

Identify the radiation r and determine the values of b and c.

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State the factor that determines the hardness of the X – rays produced in an X – ray tube.

9/7/2020

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K.C.S.E Physics Q & A - MODEL 2001PP1QN33

State the factor that determines the hardness of the X – rays produced in an X – ray tube.

answers

Pd across Anode – cathode Or anode potential (voltage)

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A 60W bulb is used continuously for 36 hours. Determine the energy consumed. Give your answer in kilowatt hour (kWh).

9/7/2020

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K.C.S.E Physics Q & A - MODEL 2001PP1QN32

A 60W bulb is used continuously for 36 hours. Determine the energy consumed. Give your answer in kilowatt hour (kWh).

answer

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K.C.S.E Physics Q & A - MODEL 2001PP1QN31

9/7/2020

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K.C.S.E Physics Q & A - MODEL 2001PP1QN31

Fig. 22 shows an electric generator. The points P and Q are connected to a cathode ray oscilloscope (CRO)

Sketch on the axes provided the graph of the voltage output as seen on the CRO Given that when t = 0 the coil is at the position shown in the figure.

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K.C.S.E Physics Q & A - MODEL 2001PP1QN30

9/7/2020

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K.C.S.E Physics Q & A - MODEL 2001PP1QN30

Fig 21 shows a converging lens whose local point F is marked.

An object is placed in front of the lens such that the lens forms a real magnified image.
Sketch on the same diagram array diagram to represent this.

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K.C.S.E Physics Q & A - MODEL 2001PP1QN29

9/7/2020

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K.C.S.E Physics Q & A - MODEL 2001PP1QN29

Fig. 20 shows a ball being whirled in a vertical plane.

Sketch on the same figure the path followed by the ball if the string cuts when the ball is at the position shown in the figure.

answer

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K.C.S.E Physics Q & A - MODEL 2001PP1QN28

9/7/2020

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K.C.S.E Physics Q & A - MODEL 2001PP1QN28

Fig. 19 shows two spheres made of wax each of mass 0.10kg held in a liquid by strings A and B.

If the upthrust on each sphere is 1.05N, determine the tension in each string.(acceleration due to gravity g = 10ms^-2)

answer

Tension in A = 1.05N – 1.0N = 0.05N
Tension in B = tension due to A + Tension due to B
0.05 _+ 0.05 = 0.10N

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State the reason why radio waves signals are easier to receive than TV (television) signals in a place surrounded by hills.

9/7/2020

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K.C.S.E Physics Q & A - MODEL 2001PP1QN27

State the reason why radio waves signals are easier to receive than TV (television) signals in a place surrounded by hills.

answer

Longer radio waves are easily diffracted around hills/ radio waves undergo diffraction easily.

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K.C.S.E Physics Q & A - MODEL 2001PP1QN26

9/7/2020

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K.C.S.E Physics Q & A - MODEL 2001PP1QN26

Fig. 18 shows the wave patterns produced in one second when two tuning forks were sounded together.

Determine the beat frequency.

answer

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K.C.S.E Physics Q & A - MODEL 2001PP1QN25

9/7/2020

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K.C.S.E Physics Q & A - MODEL 2001PP1QN25

Fig. 17(i) shows a stretched string AB vibrating in its fundamental mode.

Sketch in fig 17. (ii) and (ii) the 2nd and 3rd harmonic of the string respectively.

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K.C.S.E Physics Q & A - MODEL 2001PP1QN24

9/7/2020

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K.C.S.E Physics Q & A - MODEL 2001PP1QN24

Two identical containers A and B are placed on a bench. Container A is filled with oxygen gas and container B with hydrogen gas such that the two gases have equal masses. If the containers are maintained at the same temperature state with reason the container in which the pressure is higher.

answer

Since masses are the same, there are more hydrogen molecules than oxygen molecules/more collision in B than in A and hence more pressure in B. Collision in B is higher than in A.

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K.C.S.E Physics Q & A - MODEL 2001PP1QN23

9/7/2020

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K.C.S.E Physics Q & A - MODEL 2001PP1QN23

Fig. 16 shows a non – viscous fluid flowing through a pipe a long which vertical tubes A, B and C have been fitted.

Complete the diagram by indicating the possible levels of the fluid in tubes B and C.

answer

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K.C.S.E Physics Q & A - MODEL 2001PP1QN22

9/7/2020

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K.C.S.E Physics Q & A - MODEL 2001PP1QN22

Fig. 15 shows a tall jar containing two fluids A and B. The viscosity of A is higher than that of B. A solid sphere is released at the top of the jar and falls through the fluids.

On the axes provided, sketch the velocity – time graph for the motion of the spheres through the fluids.

answer

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K.C.S.E Physics Q & A - MODEL 2001PP1QN21

9/7/2020

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K.C.S.E Physics Q & A - MODEL 2001PP1QN21

Fig. 15 14 shows a ray of light incident on a glass prism.

If the critical angle of the glass is 39 sketch on the same diagram the path of the ray until it emerges from the prism.

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K.C.S.E Physics Q & A - MODEL 2001PP1QN20

9/7/2020

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K.C.S.E Physics Q & A - MODEL 2001PP1QN20

Fig. 13 shows a point object O placed in front of a concave mirror.
Draw appropriate rays to locate the image of the object.

answer

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K.C.S.E Physics Q & A - MODEL 2001PP1QN19

9/7/2020

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K.C.S.E Physics Q & A - MODEL 2001PP1QN19

Fig 12 shows tow identical containers A and B into which a copper rod is fitted. The containers are well lagged.

The liquids in the containers were initially at the same temperature if the heat is a applied continuously at the position shown, state with reason for the container through which the loss of heat is likely to be higher.

answer

Heat loss will be higher in A Methylated spirit will boil faster / evaporates / more volatile causing loss of heat through latent heat of vaporization.

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An electric heater rated 240V ; 300w is to be connected to a 240V mains supply, through a 10A fuse. Determine whether the fuse is suitable or not.

9/7/2020

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K.C.S.E Physics Q & A - MODEL 2001PP1QN18

An electric heater rated 240V ; 300w is to be connected to a 240V mains supply, through a 10A fuse. Determine whether the fuse is suitable or not.

answer

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K.C.S.E Physics Q & A - MODEL 2001PP1QN17

9/7/2020

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K.C.S.E Physics Q & A - MODEL 2001PP1QN17

The ammeter in the circuit in Fig. 11 has negligible resistance.
When the switch S is closed, the ammeter reads 0.01A. Determine the internal resistance of the battery.

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<<Previous

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 2001PP2QN07

b) A tin closed with an airtight lid contains air at a pressure of 1.0 x 105+ Pa and temperature of 12 C. The tin is heated in a water bath until the lid opens. If the temperature at which the lid opens is 88C, determine the pressure attained by the gas. (Ignore expansion of the tin).

K.C.S.E Physics Q & A - MODEL 2001PP2QN06

K.C.S.E Physics Q & A - MODEL 2001PP2QN05

K.C.S.E Physics Q & A - MODEL 2001PP2QN04

K.C.S.E Physics Q & A - MODEL 2001PP2QN03

K.C.S.E Physics Q & A - MODEL 2001PP2QN02

K.C.S.E Physics Q & A - MODEL 2001PP2QN01

K.C.S.E Physics Q & A - MODEL 2001PP1QN34

State the factor that determines the hardness of the X – rays produced in an X – ray tube.

A 60W bulb is used continuously for 36 hours. Determine the energy consumed. Give your answer in kilowatt hour (kWh).

K.C.S.E Physics Q & A - MODEL 2001PP1QN31

K.C.S.E Physics Q & A - MODEL 2001PP1QN30

K.C.S.E Physics Q & A - MODEL 2001PP1QN29

K.C.S.E Physics Q & A - MODEL 2001PP1QN28

If the upthrust on each sphere is 1.05N, determine the tension in each string.(acceleration due to gravity g = 10ms-2)

State the reason why radio waves signals are easier to receive than TV (television) signals in a place surrounded by hills.

K.C.S.E Physics Q & A - MODEL 2001PP1QN26

K.C.S.E Physics Q & A - MODEL 2001PP1QN25

K.C.S.E Physics Q & A - MODEL 2001PP1QN24

K.C.S.E Physics Q & A - MODEL 2001PP1QN23

K.C.S.E Physics Q & A - MODEL 2001PP1QN22

K.C.S.E Physics Q & A - MODEL 2001PP1QN21

K.C.S.E Physics Q & A - MODEL 2001PP1QN20

K.C.S.E Physics Q & A - MODEL 2001PP1QN19

An electric heater rated 240V ; 300w is to be connected to a 240V mains supply, through a 10A fuse. Determine whether the fuse is suitable or not.

K.C.S.E Physics Q & A - MODEL 2001PP1QN17

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b) A tin closed with an airtight lid contains air at a pressure of 1.0 x 10⁵+ Pa and temperature of 12 C. The tin is heated in a water bath until the lid opens. If the temperature at which the lid opens is 88C, determine the pressure attained by the gas. (Ignore expansion of the tin).

If the upthrust on each sphere is 1.05N, determine the tension in each string.(acceleration due to gravity g = 10ms^-2)