Free KCSE Physics Topical Questions KNEC Standards - ATIKA SCHOOL

K.C.S.E Physics Q & A - MODEL 2006PP2QN21

14/7/2020

K.C.S.E Physics Q & A - MODEL 2006PP2QN21

(a) Figure 12 shows a section of a house wiring system

(i) Name:
The circuit labeled P
The terminals labeled X and Y
X
Y
II Give a reason why R is connected to Y but not to X
(ii) Why is the earthing necessary in such a circuit?
(b) Determine the cost of using an electric iron rated 1500W, for a total of 30 hours given that the cost of electricity per kWh is Kshs 8.

answers

K.C.S.E Physics Q & A - MODEL 2006PP2QN20

14/7/2020

K.C.S.E Physics Q & A - MODEL 2006PP2QN20

Figure 10 shows a simple electric generator

(a) (i) Name the parts labeled P and Q
(ii) The e.m.f generated as the coil rotates is represented in the graph in figur

Give reasons for the changes in emf as the coil rotates from 0⁰ to 90⁰ and 90⁰to 180⁰
(b) The primary coil of a transformer has 1200 turns and the secondary coil has 60 turns. The transformer is connected to a 240V. a.c source.
Determine
(i) The output voltage
(ii) The output current when the primary coil has a current of 0.5A. (Assume there are no energy losses.

answers

K.C.S.E Physics Q & A - MODEL 2006PP2QN19

14/7/2020

K.C.S.E Physics Q & A - MODEL 2006PP2QN19

(a) Define the refractive index of a substance
(b) In an experiment to determine the refractive index of a liquid, the liquid was poured into a measuring cylinder. A pin was placed at the bottom of the cylinder and another pin was used to locate the apparent position of the first pin. The real depth and apparent depth were measured. The experiment was repeated with other values of real depth. The table below shows the results obtained.

(i) Plot the graph of real depth against apparent depth
(ii) From the graph determine the refractive index of the liquid
(c) Figure 9 shows a ray of light incident on a glass – air interfac

Given that the refractive index of the glass is 1.6. Determine angle θ

answers

K.C.S.E Physics Q & A - MODEL 2006PP2QN18

14/7/2020

K.C.S.E Physics Q & A - MODEL 2006PP2QN18

Figure 8 shows an object placed in front of a concave mirror of focal length 10cm. C is the centre of curvature

(i) On the same figure draw a ray diagram showing the location of the image
Use the ray diagram drawn in (i) above to determine the
(ii) Image distance
(iii) Magnification
(b) A vertical object is placed 20cm in front of a convex lens of focal length 5 cm
(i) Determine
I. The image distance
II. The magnification
(ii) State two characteristics of the image

answers

K.C.S.E Physics Q & A - MODEL 2006PP2QN17

14/7/2020

K.C.S.E Physics Q & A - MODEL 2006PP2QN17

Figure 7 shows a circuit where a battery of emf 4.5V, switches A and B, two capacitors C1 = 0.3μF and C2 = 0.5 μ F and a voltmeter are connected

(a) Determine the charge on C1 when switch A is closed and switch B is open
(b) What is the effective capacitance Ct when both switches A and B are closed?
(c) State what is observed on the voltmeter when
(i) switch A is closed and switch B is open
(ii) Switch A is closed and opened, and then B is closed
(iii) Explain the observation made in c (ii) above

answer

K.C.S.E Physics Q & A - MODEL 2006PP2QN16

14/7/2020

K.C.S.E Physics Q & A - MODEL 2006PP2QN16

In the axes provided sketch the current – voltage characteristics for reverse – biased p- n junction

answer

K.C.S.E Physics Q & A - MODEL 2006PP2QN15

14/7/2020

K.C.S.E Physics Q & A - MODEL 2006PP2QN15

A nuclear reaction is represented by the following equation

Determine the values of a and b

answer

State with a reason the effect on the X- rays produced in a n X- ray tube, when the p.d across the tube is increased

14/7/2020

K.C.S.E Physics Q & A - MODEL 2006PP2QN14

State with a reason the effect on the X- rays produced in a n X- ray tube, when the p.d across the tube is increased

ANSWER

Resulting X- rays have shorter wave length/ hard/ high frequency because electrons have higher K.E

K.C.S.E Physics Q & A - MODEL 2006PP2QN12&13

14/7/2020

K.C.S.E Physics Q & A - MODEL 2006PP2QN12&13

Figure 6 shows a tube for investing the properties of a beam of electrons. Use the information in the figure to answer questions 12 and 13

12. What property of the beam of electrons show that the electrons are traveling at a very high speed?
13. The beam of electrons is subjected to a strong magnetic field which is perpendicular to the path and into the paper. Sketch on the same figure, the new path of electrons.

ANSWER

K.C.S.E Physics Q & A - MODEL 2006PP2QN10&11

14/7/2020

K.C.S.E Physics Q & A - MODEL 2006PP2QN10&11

What is meant by the term work function?
If the frequency of the illuminating radiation is just equal to the threshold frequency of the surface explain why no photoelectric effect is observed

ANSWERS

Work function of a metal is the minimum energy required to set free (release) an electron from the surface of the metal
Threshold frequency K.E of electron = 0 hence velocity of the electron would be zero; (No motion) thus photo electric effect cannot be observed

State one condition under which Ohm's law is obeyed in a metal conductor

14/7/2020

K.C.S.E Physics Q & A - MODEL 2006PP2QN09

State one condition under which Ohm's law is obeyed in a metal conductor

ANSWER

Constant temperature
No mechanical strain

K.C.S.E Physics Q & A - MODEL 2006PP2QN08

14/7/2020

K.C.S.E Physics Q & A - MODEL 2006PP2QN08

S soldier standing some distance from a wall, blows a whistle and hears its echo 1 seconds later. How far is the wall from the soldier? ( speed of sound in air is 330ms^-1)

ANSWER

K.C.S.E Physics Q & A - MODEL 2006PP2QN07

14/7/2020

K.C.S.E Physics Q & A - MODEL 2006PP2QN07

Figure 5 shows wave fronts approaching a concave surface

Complete the diagram to show the wave fronts formed after striking the surface. Show how the focal point of the surface is located

ANSWER

Reflected waves are curved. Either converging circular reflected waves. Converging to F; OR two perpendicular lines from the surface of one of the curves meeting at F.

K.C.S.E Physics Q & A - MODEL 2006PP2QN06

14/7/2020

K.C.S.E Physics Q & A - MODEL 2006PP2QN06

Figure 4 shows a solenoid carrying an electric current.

Sketch the magnetic field pattern inside and at the ends of the solenoid

ANSWER

K.C.S.E Physics Q & A - MODEL 2006PP2QN05

14/7/2020

K.C.S.E Physics Q & A - MODEL 2006PP2QN05

A long coil is attached to a vibrating blade as shown in figure 3

State the type of mechanical wave generated by the set - up and mark alongside the coil, the length corresponding to the wavelength of the wave.

ANSWER

State a reason why the caps of the cells of a lead- acid battery are opened when charging the battery.

14/7/2020

K.C.S.E Physics Q & A - MODEL 2006PP2QN04

State a reason why the caps of the cells of a lead- acid battery are opened when charging the battery.

ANSWER

To allow escape of gases ( H2 and O2) from battery

K.C.S.E Physics Q & A - MODEL 2006PP2QN03

14/7/2020

K.C.S.E Physics Q & A - MODEL 2006PP2QN03

A metallic body shaped as shown in figure 2 is positively charged and insulted from the ground as shown in the figure.

On the figure show the charge distribution

ANSWER

K.C.S.E Physics Q & A - MODEL 2006PP2QN02

14/7/2020

K.C.S.E Physics Q & A - MODEL 2006PP2QN02

In a certain pinhole camera, the screen is 10cm from the pinhole. When the camera is placed 6m away from a tree, a sharp image of the tree 16cm high is formed on the screen. Determine the height of the tree.

ANSWER

K.C.S.E Physics Q & A - MODEL 2006PP2QN01

14/7/2020

K.C.S.E Physics Q & A - MODEL 2006PP2QN01

Figure 1 shows two bar magnets placed with the south poles close together

In figure 1 sketch the magnetic field pattern between the two south poles

ANSWER

K.C.S.E Physics Q & A - MODEL 2006PP1QN18

14/7/2020

K.C.S.E Physics Q & A - MODEL 2006PP1QN18

(a) Define specific latent heat of fusion of a substance
(b) Water of mass 200 g at a temperature of 60⁰C is put well lagged copper calorimeter of mass 80g. A piece of ice at 0⁰C and mass 20 g is placed in the calorimeter and the mixture stirred gently until all the ice melts. The final temperature, T of the mixture is then measured.
Determine
(i) The heat absorbed by the melting ice at 0⁰C.
(ii) The heat absorbed by the melted ice ( water) to rise to temperature T (answer may be given in terms of T)
(iii) The heat lost by the warm water and the calorimeter (answer may be given in terms of T)
(iv) The final temperature T of the mixture (specific latent heat of fusion of ice = 334 000 J kg^-1 ( specific heat capacity of water = 4 200 Jkg^-1 k^-1 Specific heat capacity of copper = 900 J kg^-1)

ANSWERS

K.C.S.E Physics Q & A - MODEL 2006PP1QN17

14/7/2020

K.C.S.E Physics Q & A - MODEL 2006PP1QN17

(a) state Archimedes principle
(b) in an experiment to determine the relative density of methylated spirit applying Archimedes Principal, the following were provided, a spring balance, some masses, a piece of thread, water in a beaker and methylated spirit in a beaker. The table below shows the results obtained.

(i) Draw labeled sketch diagrams to show how the readings in the table were obtained
(ii) For each mass, determine the upthrust in water and the upthrust in the spirit
(iii) Determine the average relative density of the spirit
(c) A weather balloon of volume 1.2m³ is tied to a rigid support while being filled with helium gas. The mass of the fabric making the balloon is 0.30kg.
Determine the maximum tension on the string trying the balloon to the rigid support

ANSWERS

K.C.S.E Physics Q & A - MODEL 2006PP1QN16

14/7/2020

K.C.S.E Physics Q & A - MODEL 2006PP1QN16

(a) State what is meant by an ideal gas
(b) The pressure acting on a gas in a container was changed steadily while the temperature of the gas maintained constant. The value of volume V of the gas was measured for various values of pressure. The graph in figure 9 shows the relation between the pressure, p and the reciprocal of volume 1

(i) Suggest how the temperature of the gas could be kept constant
(ii) Given that the relation between the pressure P1 and the volume, V1 of the gas is given by
PV = k
When k is a constant, use the graph to determine the value of k.
(iii) What physical quantity does k represent?
(iv) State one precautions you would take when performing such an experiment
(c) A gas occupies a volume of 4000 litres at a temperature of 37⁰C and normal atmospheric pressure. Determine the new volume of the gas if it heated at constant pressure to a temperature of 67⁰C (normal atmospheric pressure P= 1.01 x 10⁵ pa)

ANSWERS

K.C.S.E Physics Q & A - MODEL 2006PP1QN15

14/7/2020

K.C.S.E Physics Q & A - MODEL 2006PP1QN15

(a) You are provided with two wires of same material and same thickness. Describe how you would make two spiral springs of different springs constants (assume that other apparatus to make springs are available).
(b) In an experiment, two identical springs are attached end to end. One end of the combined springs is fixed to a rigid support such that the spring hangs vertically. Masses are then hang from the lower end.
The graph in figure 8 shows the relation between the force ( weight) and the extension for the combined springs

From the graph determine
(i) The elastic limit for the combined springs
(ii) The springs constant of the combined spring and hence for each spring
(iii) The work done in stretching the combined spring from 15 mm to 32 mm

ANSWERS

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

14/7/2020

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

(c) State
(i) Any assumption made in (b) (iii) above
(ii) Two possible sources of errors in this experimen

ANSWER

K.C.S.E Physics Q & A - MODEL 2006PP1QN13

14/7/2020

K.C.S.E Physics Q & A - MODEL 2006PP1QN13

A footballer kicks a ball of mass 0.6 kg initially at rest using a force of 720N. If the foot was in contact with the ball for 0.1 seconds, what was the take off speed of the ball?

ANSWER

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Topics

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)

TOPICS

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)

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