Free KCSE Physics Topical Questions KNEC Standards - ATIKA SCHOOL

K.C.S.E Physics Q & A - MODEL 2000PP2QN07

8/7/2020

K.C.S.E Physics Q & A - MODEL 2000PP2QN07

(a) Explain how a p- type semiconductor is made from a pure a semiconductor
(b) The curves in fig 10. Show the output characteristics of a n – p-n transistor in common emitter mode. The p.d of the battery, Vcc is 9.0V and the load resistors RL is 1.8 kohms

i. Draw the circuit diagram for the experiment set- up that may be used to obtain the curves in the figure.
ii. Given that ohm's law for the circuit is VCE = Vcc – IcRL, draw on the same axes, the load line for the circuit ( hint: load - line passes through. (VCE = 0 and Ic = 0)
Drawing load line on graph (see graph)
When IB = 30μA, An alternating signal is fed into the base so that the base current changes by ± 20μA. Use the graph to determine the corresponding change in collector current Ic and hence determine the current gain beta

answers

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

8/7/2020

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

K.C.S.E Physics Q & A - MODEL 2000PP2QN05

8/7/2020

K.C.S.E Physics Q & A - MODEL 2000PP2QN05

(a) Fig 8 shows a container with small holes at the bottom in which wet clothes have been put. When the container is whirled in air at high speed as shown, it is observed that the clothes dry faster.

Explain how the rotation of the container causes the clothes to dry faster.
(b) (i) A glass block of mass 100g is placed in turn at various distances from the centre of a table which is rotating at constant angular velocity. It is found that a distance of 8.0 cm from the centre, the block just starts to slide off the table. If the force of the friction between the block and the table is 0.4 N determine.
(I) The angular velocity of the table
(II) The force required to hold the block at a distance of 12 cm from the centre of the table.
(ii) A glass of mass 200 g is now placed at a distance of 8.0 cm from the centre of the table in (i) above, and the table rotated at the same constant angular velocity. State with a reason whether or not the block will slide.

answers

K.C.S.E Physics Q & A - MODEL 2000PP2QN04

8/7/2020

K.C.S.E Physics Q & A - MODEL 2000PP2QN04

(a) (i) State one property of soft iron that makes it suitable for use as a transformer core.
(ii) Fig 6 represents a step- down transformer with 500 turns in the primary and 50 turns in the secondary. The turns are wound uniformly on the core. The lengths of PQ and QR are indicated. Determine the p.d across PQ.
(b) Fig 7 represents a block of uniform cross sectional area of 6.0cm² floating on two liquids A and B. The lengths of the block in each liquid are shown.

Given that the density of liquid A is 800kgm^-3 and that of liquid B is 1000kgm³ determine the:
(i) b weight of liquid A displaced
(ii) Weight of liquid B displaced
(iii) Density of the block

answers

K.C.S.E Physics Q & A - MODEL 2000PP2QN03

8/7/2020

K.C.S.E Physics Q & A - MODEL 2000PP2QN03

a) Using the kinetic theory of gases, explain how a rise in the temperature of a gas causes a rise in the pressure of the gas if the volume is kept constant.
b) Fig. 5 shows a set up that may be used to verify Charles Law.

i) State the measurements that should be taken in the experiment.
ii) Explain how the measurements taken in (i) above, may be used to verify Charles Law.
iii) What is the purpose of the water bath.
c) A certain mass of hydrogen gas occupies a volume of 1 .6m³ at a pressure of 1.5 x10⁵ pa and temperature 12°C. Determine its volume when the temperature is 0°C at a pressure of 1.0 x 10⁵ pa.

answers

K.C.S.E Physics Q & A - MODEL 2000PP2QN02

8/7/2020

K.C.S.E Physics Q & A - MODEL 2000PP2QN02

a) Two identical spherical steel balls are released from the top of two tall jars containing liquids L1 and L2 respectively. Fig 3 shows the velocity – time graph of the option of the balls.

Explain the nature of the curves and state why they are different.
b) In an experiment to determine the proportionality constant, μ between two wooden surfaces sliding on each other, a block of mass 2.20kg was placed on a horizontal bench. The block was then made to slide by adding mass "M" On the scale as shown in Fig 4. The experiment was repeated for other values of "m".The acceleration of the block was measured for each mass added

i) Name and indicate on figure 4 the forces acting on the 2.20kg mass.
ii) Plot the graph of acceleration, a against the mass m

answers

K.C.S.E Physics Q & A - MODEL 2000PP2QN01

8/7/2020

K.C.S.E Physics Q & A - MODEL 2000PP2QN01

a) i) State one application of each of the following.
Convex mirror- Parabolic mirror
ii) Fig. 1, which is drawn to a scale of 1:5, represents an object O and its image 'I' formed by a concave mirror.

By drawing suitable rays, locate and mark on the figure the position of the principal focus 'F' of the mirror. Determine the focal length f.
b) The graph in Fig. 2 shows the variation of magnification, M with image distance, V for a concave mirror.

Determine:
i) The object position when the image position is 45cm
ii) The focal length of the mirror.

answers

K.C.S.E Physics Q & A - MODEL 2000PP1QN36

8/7/2020

K.C.S.E Physics Q & A - MODEL 2000PP1QN36

The graph in Fig 20 shows the disintegration per second versus time in seconds, s for a sample of radioactive material; determine the half – life of the sample.

answer

State and explain the effect of increasing the E.H.T in an x-ray tube on the X-rays produced.

8/7/2020

K.C.S.E Physics Q & A - MODEL 2000PP1QN35

State and explain the effect of increasing the E.H.T in an x-ray tube on the X-rays produced.

answers

X – rays produces
- Hard X – rays are produced

An atom changes from an excited state to an unexcited state releasing energy. State one factor that affects the frequency of the radiation released.

8/7/2020

K.C.S.E Physics Q & A - MODEL 2000PP1QN34

An atom changes from an excited state to an unexcited state releasing energy. State one factor that affects the frequency of the radiation released.

answer

Difference in energy of the state/ nature of atoms

State the reason why soft iron is laminated.

8/7/2020

K.C.S.E Physics Q & A - MODEL 2000PP1QN33

State the reason why soft iron is laminated.

answer

To reduce eddy currents in the armature

K.C.S.E Physics Q & A - MODEL 2000PP1QN32

8/7/2020

K.C.S.E Physics Q & A - MODEL 2000PP1QN32

An armature composed of turns of insulated copper wire would on laminated soft –iron core is rotated in a magnetic field to generate an e.m.f. Use this information to answer questions 32.

State two factors other than the speed of rotation that affect the molecule of the e.m.f generated.

ANSWER

Number of turns/ strength of magnetic field

K.C.S.E Physics Q & A - MODEL 2000PP1QN31

8/7/2020

K.C.S.E Physics Q & A - MODEL 2000PP1QN31

Fig (19) drawn to scale) shows the image, I, formed by a diverging lens. F is principal focus of the lens.

By drawing the appropriate rays on the same diagram, locate the position of the object.

ANSWER

K.C.S.E Physics Q & A - MODEL 2000PP1QN30

8/7/2020

K.C.S.E Physics Q & A - MODEL 2000PP1QN30

In fig. 18 ultra – violet (u,v) light falls on a zinc plate placed on a charged leaf electroscope. It is observed that the leaf collapses.

ANSWER

U.V removes electrons from zinc surface so leaf will not only collapse if electroscope was negatively charged.

State two uses of microwaves.

8/7/2020

K.C.S.E Physics Q & A - MODEL 2000PP1QN29

State two uses of microwaves.

ANSWER

Microwave / cooker/ telephone/ radar

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

8/7/2020

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

K.C.S.E Physics Q & A - MODEL 2000PP1QN27

8/7/2020

K.C.S.E Physics Q & A - MODEL 2000PP1QN27

In fig 16.(a) the Polaroids ABCD and EFGH are oriented such that maximum light reaches the screen S. Sketch at X on Fig. 16 (b) the orientation of EFGH such that no light reaches S.

ANSWER

K.C.S.E Physics Q & A - MODEL 2000PP1QN26

8/7/2020

K.C.S.E Physics Q & A - MODEL 2000PP1QN26

Fig. 15 shows a battery of emf 3.0 V connected in series with two capacitors.

ANSWER

K.C.S.E Physics Q & A - MODEL 2000PP1QN25

8/7/2020

K.C.S.E Physics Q & A - MODEL 2000PP1QN25

A student holds a sheet of paper at one end so that it hangs in the position A shown in fig. 14

Explain why the paper rises to the position B when the student blows air in the direction shown by the arrow.

ANSWER

.The air above paper travels faster than below causing lower pressure above. Excess pressure causes paper to be raised.

K.C.S.E Physics Q & A - MODEL 2000PP1QN24

8/7/2020

K.C.S.E Physics Q & A - MODEL 2000PP1QN24

Fig 13. Shows a semicircular glass block placed on a bench. A ray of light is incident at point O as shown. The angle of incidence, I , is just greater than the critical angle of glass.

A drop of water is now placed on the bench so as to make contact with the glass at point O. Sketch on the same figure the path followed by the ray after placing the drop of water.

ANSWER

K.C.S.E Physics Q & A - MODEL 2000PP1QN23

8/7/2020

K.C.S.E Physics Q & A - MODEL 2000PP1QN23

Fig. 12 shows a ray of light incident on a convex mirror

Using a suitable construction on the same diagram determine the radius of curvature of the mirror

ANSWER

K.C.S.E Physics Q & A - MODEL 2000PP1QN22

8/7/2020

K.C.S.E Physics Q & A - MODEL 2000PP1QN22

Two identical blocks of copper are taken from the same furnace. One block is dropped into a well - lagged calorimeter containing 200g of methylated spirit. Both water and spirit were initially at the same temperature. After being given time to stabilize the temperature, it was found that more spirit than water had evaporated.
State two factors that could have caused this difference.

ANSWER

Boiling point of spirit is lower than that of water. Specific heat capacity is lower than that of water.

K.C.S.E Physics Q & A - MODEL 2000PP1QN21

8/7/2020

K.C.S.E Physics Q & A - MODEL 2000PP1QN21

A wire is stretched between two fixed points such that when it is plucked, it produces sound. Explain why the pitch of the sound produced may become lower when the temperature of the surrounding rises.

ANSWER

Wire expands becoming longer (reduces tension) this lowers frequency hence pitch.

K.C.S.E Physics Q & A - MODEL 2000PP1QN20

8/7/2020

K.C.S.E Physics Q & A - MODEL 2000PP1QN20

A body initially resting on horizontal surface is accelerated by a constant force. It passes over a small region where it experiences a force of friction equal to the accelerating force before returning to the frictionless horizontal surface. On the axes provided, sketch the velocity time graph for the motion of the body

ANSWER

An electric bulb rated, 40W is operating on 240V mains. Determine the resistance of its filament.

8/7/2020

K.C.S.E Physics Q & A - MODEL 2000PP1QN19

An electric bulb rated, 40W is operating on 240V mains. Determine the resistance of its filament.

ANSWER

CATEGORIES

Categories

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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