Free KCSE Physics Topical Questions KNEC Standards

K.C.S.E Physics Q & A - MODEL 1997PP1QN32

6/7/2020

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K.C.S.E Physics Q & A - MODEL 1997PP1QN32

Using the components symbols shown in figure 14, sketch a series circuit diagram for a forward biased diode

ANSWERS

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K.C.S.E Physics Q & A - MODEL 1996PP1QN33

5/7/2020

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K.C.S.E Physics Q & A - MODEL 1996PP1QN33

α- particles are more ionizing than beta- particles. Give one reason for this

In the figure 7 the circuit diagram contains bulbs B, a transistor T and a resistor R. A diode D is connected between points Y and X as shown. In the set up bulb B is not lit. When the connections YP and XQ are made, B lights. Answer questions 34, 35 and 36 with reference to the figure.
Name the type of transistor used in the circuit
Explain the observation when the connections are made

answers

Low speed / high charge / more massive/ size is large/ bigger`
n-p-n
Limit the current through the base controls the current/ protect transistor from high current or voltage/ regulate reduce voltage.
Diode is forward biased; Base currents flows; hence collector current flows and lights the bulb/ current amplification air molecule are in constant random motion; smoke particles collide with these air molecules hence their random motion

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K.C.S.E Physics Q & A - MODEL 1995PP2QN07

3/7/2020

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K.C.S.E Physics Q & A - MODEL 1995PP2QN07

The sketch in the fig 5 shows the results of an experiment where a transistor was used as a voltage amplifier

(c)Explain how the voltage amplification factor, beta, may be obtained from the sketch graph
(d) (i) Draw a circuit diagram of p – n – p transistor operating in the common emitter ( C-E) mode indicate on the diagram the directions of the collector current Ic the base current IB the emitter current IE
(ii) Write the equation relating IC IB IE
(e) Identify the type of biasing in each of the junctions of a transistor in operation

answers

(c) At the middle of the reaction of a curve a tangent is drawn change on output (∆V0) is determined and a corresponding change input (∆V1) also attained change amplification.

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Distinguish between p- n- p and n – p – n transistors

3/7/2020

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K.C.S.E Physics Q & A - MODEL 1995PP2QN07

Distinguish between p- n- p and n – p – n transistors

answers

p-n-p emitter and carries made of p type material are of n- type material for charge carries holes n – p – n – emitter and collector made of n- type material are made of p- type (or charge carries electrons)

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Describe how a p- type semi conductor is formed

3/7/2020

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K.C.S.E Physics Q & A - MODEL 1995PP2QN07

Describe how a p- type semi conductor is formed

ANSWERS

Common or silicon (semiconductor) is doped with impurity atoms which trivalent (e. g boron or indium) intensity in currency on pole group 4 doped with trivalent

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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 1997PP1QN32

K.C.S.E Physics Q & A - MODEL 1997PP1QN32

K.C.S.E Physics Q & A - MODEL 1996PP1QN33

K.C.S.E Physics Q & A - MODEL 1996PP1QN33

K.C.S.E Physics Q & A - MODEL 1995PP2QN07

K.C.S.E Physics Q & A - MODEL 1995PP2QN07

Distinguish between p- n- p and n – p – n transistors

Distinguish between p- n- p and n – p – n transistors

Describe how a p- type semi conductor is formed

Describe how a p- type semi conductor is formed

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FORM I - PHYSICS SYLLABUS

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FORM III - PHYSICS SYLLABUS

FORM IV - PHYSICS SYLLABUS

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