Free KCSE Physics Topical Questions KNEC Standards

K.C.S.E Physics Q & A - MODEL 2005PP2QN07

13/7/2020

K.C.S.E Physics Q & A - MODEL 2005PP2QN07

(a) What is meant by radioactivity
(b) With an aid of a labeled diagram explain the working of Geiger Muller tube as a detector of radiation
(c) In an experiment to determine the half of a certain radioactivity substance, the activity in disintegrations per minute was measured for sometime. Table 1 shows the results obtaine

On the grid plot a suitable graph and sue it to determine the half life t ½ of the substance
(d) At time t = 40 minutes, the activity of a sample of a certain radioactive isotope with a half life 12 minutes if found to be 480 disintegration per minute.
Determine the time which activity was 3840 disintegrations per minute

answers

0 Comments

K.C.S.E Physics Q & A - MODEL 2005PP2QN06

13/7/2020

0 Comments

K.C.S.E Physics Q & A - MODEL 2005PP2QN06

(a) Define the term angular velocity
(b) A body moving with uniform angular velocity is found to have covered an angular distance of 170 radians in t seconds. Thirteen seconds later it is found to have covered a total angular distance of 300 radians. Determine t.
(c) Fig 8 shows a body of mass m attached to the centre of a rotating table with a string whose tension can be measured. (The device for measuring the tension is not shown in the figure)

The tension, T on the string was measured for various values of angular velocity, w. The distance r of the body from the centre was maintained at 30cm. Table 1 shows the results obtained.

(i) Plot the graph of T (y- axis against w²)
(ii) From the graph, determine the mass, m of the body given that
T = mw²–C
Where C is a constant
(iii) Determine the constant C and suggest what it represents in the set up.

answers

0 Comments

K.C.S.E Physics Q & A - MODEL 2005PP2QN05

13/7/2020

0 Comments

K.C.S.E Physics Q & A - MODEL 2005PP2QN05

(a) State Hooke's law
(b) One of a piece of a rubber was fixed to a rigid support and the other end pulled with a force of varying magnitude. The graph in fig 6 shows the relationship between the force (N) and the extension (cm)

Using the graph, determine
(i) The stretching force at the elastic limit
(ii) The tensile stress in the rubber at an extension of 5 cm if the cross-section of the rubber is 0.25cm2
(iii) The tensile in the rubber at an extension of 5cm if the original length was 2 m
(c) In Fig 7. girders AB, BC, CD, ED, EB and BD were joined to make the rigid structure shown. The load W hangs from the structure as shown.

Which of the girders can be replaced with strings without affecting the structure?

answers

0 Comments

K.C.S.E Physics Q & A - MODEL 2005PP2QN04

13/7/2020

0 Comments

K.C.S.E Physics Q & A - MODEL 2005PP2QN04

Explain how doping producers an n-type semi-conductor for a pure semi-conductor material.
b) Fig 5. Shows the circuit of a rectifier using four diodes D1, D2, D3 and d4.

(i) Explain how a rectified output is produced from the set – up when an a.c input is connected across AB
(ii) On the axis provided sketch the graph of output voltage against time for rectifier
(iii) A capacitor is now connected across XY. Explain the effect of the capacity on the output.
(c) A transistor in a common-emitter amplifier has life = 120. A signal in the input causes the base corresponding change in the output voltage if the load resistance is 100n.

answers

0 Comments

K.C.S.E Physics Q & A - MODEL 2005PP2QN03

13/7/2020

0 Comments

K.C.S.E Physics Q & A - MODEL 2005PP2QN03

3 When the switch is closed determine the:
(i) Ammeter reading
(ii) Charge on each conductor

answers

0 Comments

<<Previous

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 2005PP2QN07

K.C.S.E Physics Q & A - MODEL 2005PP2QN07

K.C.S.E Physics Q & A - MODEL 2005PP2QN06

K.C.S.E Physics Q & A - MODEL 2005PP2QN06

(i) Plot the graph of T (y- axis against w²)
(ii) From the graph, determine the mass, m of the body given that
T = mw²–C
Where C is a constant
(iii) Determine the constant C and suggest what it represents in the set up.

K.C.S.E Physics Q & A - MODEL 2005PP2QN05

K.C.S.E Physics Q & A - MODEL 2005PP2QN05

K.C.S.E Physics Q & A - MODEL 2005PP2QN04

K.C.S.E Physics Q & A - MODEL 2005PP2QN04

K.C.S.E Physics Q & A - MODEL 2005PP2QN03

K.C.S.E Physics Q & A - MODEL 2005PP2QN03

Categories

FORM I - PHYSICS SYLLABUS

FORM II - PHYSICS SYLLABUS

FORM III - PHYSICS SYLLABUS

FORM IV - PHYSICS SYLLABUS

Archives

M.A Nyamoti

HIGH SCHOOL RESOURCES

PRIMARY SCHOOL RESOURCES 8-4-4

PRIMARY SCHOOL RESOURCES CBC

COLLEGE RESOURCES

FREE NOVELS

Send Us a Message

K.C.S.E Physics Q & A - MODEL 2005PP2QN07

K.C.S.E Physics Q & A - MODEL 2005PP2QN07

K.C.S.E Physics Q & A - MODEL 2005PP2QN06

K.C.S.E Physics Q & A - MODEL 2005PP2QN06

(i) Plot the graph of T (y- axis against w2) (ii) From the graph, determine the mass, m of the body given that T = mw2–C Where C is a constant (iii) Determine the constant C and suggest what it represents in the set up.

K.C.S.E Physics Q & A - MODEL 2005PP2QN05

K.C.S.E Physics Q & A - MODEL 2005PP2QN05

K.C.S.E Physics Q & A - MODEL 2005PP2QN04

K.C.S.E Physics Q & A - MODEL 2005PP2QN04

K.C.S.E Physics Q & A - MODEL 2005PP2QN03

K.C.S.E Physics Q & A - MODEL 2005PP2QN03

Categories

FORM I - PHYSICS SYLLABUS

FORM II - PHYSICS SYLLABUS

FORM III - PHYSICS SYLLABUS

FORM IV - PHYSICS SYLLABUS

Archives

M.A Nyamoti

HIGH SCHOOL RESOURCES

PRIMARY SCHOOL RESOURCES 8-4-4

PRIMARY SCHOOL RESOURCES CBC

COLLEGE RESOURCES

FREE NOVELS

Send Us a Message

(i) Plot the graph of T (y- axis against w²)
(ii) From the graph, determine the mass, m of the body given that
T = mw²–C
Where C is a constant
(iii) Determine the constant C and suggest what it represents in the set up.