Free KCSE Physics Topical Questions KNEC Standards

K.C.S.E Physics Q & A - MODEL 2005PP1QN16

13/7/2020

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K.C.S.E Physics Q & A - MODEL 2005PP1QN16

Fig 10 represents a transverse wave of frequency 5 Hz traveling in the x direction

Determine the speed of the wave.

answer

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K.C.S.E Physics Q & A - MODEL 2004PP1QN30

12/7/2020

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K.C.S.E Physics Q & A - MODEL 2004PP1QN30

Fig. 15 shows water waves of different wavelengths incidentical apertures A and B.

Complete the diagram to show the pattern of the waves beyond the aperture in each case

answer

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State the difference between mechanical and electromagnetic waves.

12/7/2020

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K.C.S.E Physics Q & A - MODEL 2004PP1QN19

State the difference between mechanical and electromagnetic waves.

answer

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K.C.S.E Physics Q & A - MODEL 2003PP2QN04

12/7/2020

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K.C.S.E Physics Q & A - MODEL 2003PP2QN04

a) Figure 3 shows a transverse wave traveling along x-axis.

(i) Determine the:
I Wavelength of the wave
II Amplitude of the wave.
(ii) If the time taken by the wave to move from 0 to A is 0.09 seconds, determine the:
I Frequency of the wave.
II Speed of the wave
b) Figure 4 shows a Geiger muller (GM) tub

(i) Give the reason why the mica window is made thin.
(ii) Explain how the radiation entering the tube through the window is detected by the tube.
(iii) What is the purpose of the halogen vapour

answers

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K.C.S.E Physics Q & A - MODEL 2003PP1QN27

12/7/2020

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K.C.S.E Physics Q & A - MODEL 2003PP1QN27

Figure 15 shows an experimental arrangement for determining the wavelength of light,

State and explain the difference in the patterns observed on the screen other than the difference in colour when the source of red light is replaced by a source of violet light.

ANSWER

Fringes will be closer together / more fringes of violet light has a shorter wavelength Red light has longer wavelength.

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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.

answers

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K.C.S.E Physics Q & A - MODEL 2002PP1QN23

10/7/2020

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K.C.S.E Physics Q & A - MODEL 2002PP1QN23

Fig. 12 shows water waves incident on an aperture AB.

On the same diagram, sketch the waves after going through the aperture.

answer

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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 2001PP1QN16

9/7/2020

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K.C.S.E Physics Q & A - MODEL 2001PP1QN16

Fig 10. Shows water waves incident on a shallow region of the shape shown with dotted line.

On the same diagram, sketch the wave pattern in and beyond the shallow region.

answer

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K.C.S.E Physics Q & A - MODEL 2000PP2QN06

8/7/2020

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K.C.S.E Physics Q & A - MODEL 2000PP2QN06

a) State the necessary conditions for interference to occur in waves
b) Fig 9. Drawn to scale of 1: 200 shows two speakers L1 and L2 connected to a signal generator (not shown) producing sound waves of frequency 350Hz. An observer walking along PQ hears loud and low sounds at alternative positions.

(i) Explain how the observations made are caused
(ii) At point O a loud sound is heard and at point A, the next loud sound is heard. Use this information and the diagram to determine the velocity of sound in air.
(iii) State and explain the effect of increasing the frequency of the signal generator on the distance OA.

answers

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K.C.S.E Physics Q & A - MODEL 2000PP1QN28

8/7/2020

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K.C.S.E Physics Q & A - MODEL 2000PP1QN28

Fig 17 (a) shows the wave pattern at resonance in an open tube when a turning fork of frequency fo is sounded near one end of the tube.

Sketch in fig 17(b) the pattern of the wave at resonance when a fork of frequency 3fo is sounded near one end of an identical tube.

ANSWER

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Give one example of a longitudinal wave.

8/7/2020

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K.C.S.E Physics Q & A - MODEL 2000PP1QN17

Give one example of a longitudinal wave.

ANSWER

Sound waves

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K.C.S.E Physics Q & A - MODEL 1999PP2QN01

7/7/2020

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K.C.S.E Physics Q & A - MODEL 1999PP2QN01

a) Distinguish between longitudinal and transverse waves
b) In the Young‟s double slit experiment, and interference pattern of bright and dark fridges was formed as shown in figure 1 by alight of wavelength coming from two narrow slits X and Y.

i) Write an expression for the path difference between XP and YP where corresponds to the 2nd bright fringe.
ii) Explain how the dark and bright fringes are formed.
iii) State and explain what would be observed on the screen if the slits X and Y were made large.
c) Figure 2 represents a displacement – time graph for a wave.

i) Determined the frequency of the wave.
ii) Sketch on the same axes, the displacement – time graph of a wave of the same frequency but 180 out of phase and with a smaller amplitude.

answers

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K.C.S.E Physics Q & A - MODEL 1999PP1QN17

7/7/2020

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K.C.S.E Physics Q & A - MODEL 1999PP1QN17

Figure 12 shows how displacement varies with time as a wave passes a fixed point

Determine the frequency of the waves

ANSWER

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K.C.S.E Physics Q & A - MODEL 1998PP1QN32

7/7/2020

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K.C.S.E Physics Q & A - MODEL 1998PP1QN32

Fig 11 shows a double slit placed in front of a source, s of waves, a director D is placed beyond the slits, such that its position can be adjusted along the line XY

State with a reason, what the detector records along XY.

ANSWER

There will be no variation of intensity of light/ uniform intensity/no bands/one

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K.C.S.E Physics Q & A - MODEL 1997PP2QN07

6/7/2020

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K.C.S.E Physics Q & A - MODEL 1997PP2QN07

a) i. Distinguish between transverse and longitudinal waves
ii. Give one example of a transverse and one example of longitudinal.
b) Figure 6 shows the displacement of a particle in a progressive wave incident on a boundary between deep and shallow regions.

i. Complete the diagram to show what is observed after boundary. (assume no loss of energy)
ii. Explain the observation in (i) above.
(c) Water waves are observed as they pass a fixed point at a rate of 30 crests per minute. A particular wave crest takes 2s to travel between two fixed points 6m apart. Determine for the wave:
(a) The frequency
(b) Wavelength
(d) Figure 7 shows two loud speakers L1 and L2 connected to a signal generato

One observer walks along line 00'' and another line AA'' for some distance. Describe the observations made by each observer and give reasons for your answer

ANSWERS

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K.C.S.E Physics Q & A - MODEL 1997PP1QN30

6/7/2020

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K.C.S.E Physics Q & A - MODEL 1997PP1QN30

Figure 12 shows an experiment arrangement. S1 S2 and S are narrow slit

State what is observed on the screen when the source is?
(a) Monochromatic
(b) White light

ANSWERS

(a) Dark and bright fringes
(b) Coloured fringes

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K.C.S.E Physics Q & A - MODEL 1996PP2QN05

5/7/2020

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K.C.S.E Physics Q & A - MODEL 1996PP2QN05

(a) (i) What is the difference between longitudinal and transverse waves?
(ii) State two distinctions between the way sound waves and electromagnetic waves are transmitted
(b) A mineworker stands between two vertical cliffs 400m from the nearest cliff. The cliffs are X distance apart. Every time he strikes the rock once, he hears two echoes, the first one after 2.5 s, while the second follows 2s later. From this information; calculation:
(i) The speed of the sound in air
(ii) The value of X
(c) In an experiment to observe interference of light waves a double slit is placed close to the source. See figure

(i) State the function of the double slit
(ii) Describe what is observed on the screen
(iii) State what is observed on the screen when
I. The slit separation S1S2 is reduced
II. White light source is used in place of monochromatic source

answers

(a) (i) Particles of the transmitting medium vibrate in the direction of the wave for a longitudinal wave, but at right angles for a transverse wave:Sound requires medium but no medium required for electromagnetic wave; speed of sound lower than that of electromagnetic wave;

(c) (i) Double slit provides coherent sources;
(ii) Dark and bright fringes;
The central fringe is the brightest while the intensity of the other fringes reduces away from the central fringe;
(iii) I. The separation of fringes increases
II. Central fringe is white; fringes on either side are colored;

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K.C.S.E Physics Q & A - MODEL 1996PP1QN17

5/7/2020

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K.C.S.E Physics Q & A - MODEL 1996PP1QN17

Circular water waves generated by a point sources at the centre. O of the pond are observed to have the pattern shown in figure 6

Explain the pattern

answers

The wavelength/ velocity of the water waves reduces; away from the centre because the pond becomes shallower/ pond deeper at centre

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K.C.S.E Physics Q & A - MODEL 1995PP2QN06

3/7/2020

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K.C.S.E Physics Q & A - MODEL 1995PP2QN06

The sketch graph in fig 4 shows the results of an experiment to study diffraction patterns using a double slit.

(i) Sketch an experimental set up that can be used to obtain such a pattern
(ii) Name an instrument for measuring the intensity
(iii) Explain how the peaks labeled A and B, and troughs labeled C are formed

K.N.E.C ANSWER

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State the condition for a minim to occur in an interference pattern

3/7/2020

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K.C.S.E Physics Q & A - MODEL 1995PP2QN06

State the condition for a minim to occur in an interference pattern

K.N.E.C MARKING SCHEME

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Describe how a young's double slit may be made in a laboratory

3/7/2020

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K.C.S.E Physics Q & A - MODEL 1995PP2QN06

Describe how a young's double slit may be made in a laboratory

K.N.E.C MARKING SCHEME

A glass slide i.e. blackened with soot or paint lines are drawn close together using a razor blade or pin.

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Distinguish between stationary and progressive waves

3/7/2020

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K.C.S.E Physics Q & A - MODEL 1995PP2QN06

Distinguish between stationary and progressive waves

K.N.E.C ANSWERS

Progressive wave- Wave profile moves along with the speed of the wave
Stationary wave – wave profile appears static
Progressive wave – Phase of points adjacent to each other is different
Stationary wave – All points between successive node vibrate in phase
Progressive wave – Energy translation in the direction of the wave travels
Stationary wave- No translation of energy but energy associated in the wave

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K.C.S.E Physics Q & A - MODEL 1995PP1QN35

3/7/2020

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K.C.S.E Physics Q & A - MODEL 1995PP1QN35

Figure 10 represent a signal being fed into a demodulator of a radio receiver. Sketch in the space provided, the output signal

K.N.E.C MARKING SCHEME

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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 2005PP1QN16

K.C.S.E Physics Q & A - MODEL 2004PP1QN30

State the difference between mechanical and electromagnetic waves.

K.C.S.E Physics Q & A - MODEL 2003PP2QN04

K.C.S.E Physics Q & A - MODEL 2003PP1QN27

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

K.C.S.E Physics Q & A - MODEL 2002PP1QN23

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 2001PP1QN16

K.C.S.E Physics Q & A - MODEL 2000PP2QN06

K.C.S.E Physics Q & A - MODEL 2000PP1QN28

Give one example of a longitudinal wave.

K.C.S.E Physics Q & A - MODEL 1999PP2QN01

K.C.S.E Physics Q & A - MODEL 1999PP1QN17

K.C.S.E Physics Q & A - MODEL 1998PP1QN32

K.C.S.E Physics Q & A - MODEL 1997PP2QN07

K.C.S.E Physics Q & A - MODEL 1997PP1QN30

K.C.S.E Physics Q & A - MODEL 1996PP2QN05

K.C.S.E Physics Q & A - MODEL 1996PP1QN17

K.C.S.E Physics Q & A - MODEL 1995PP2QN06

State the condition for a minim to occur in an interference pattern

Describe how a young's double slit may be made in a laboratory

Distinguish between stationary and progressive waves

K.C.S.E Physics Q & A - MODEL 1995PP1QN35

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FORM I - PHYSICS SYLLABUS

FORM II - PHYSICS SYLLABUS

FORM III - PHYSICS SYLLABUS

FORM IV - PHYSICS SYLLABUS

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