Free KCSE Physics Topical Questions KNEC Standards

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.

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

14/7/2020

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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.

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

14/7/2020

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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

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

14/7/2020

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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

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

14/7/2020

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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

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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 2006PP2QN21

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

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

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

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

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

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

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

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

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

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FORM I - PHYSICS SYLLABUS

FORM II - PHYSICS SYLLABUS

FORM III - PHYSICS SYLLABUS

FORM IV - PHYSICS SYLLABUS

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