Free KCSE Physics Topical Questions KNEC Standards

K.C.S.E Physics Q & A - MODEL 2017PP1QN17

28/7/2020

K.C.S.E Physics Q & A - MODEL 2017PP1QN17

(a) State the law of flotation.
(b) Figure 6 shows two solids W and X made of the same material and immersed in water.

(i) State with a reason which one of the containers experiences a greater upthrust.
(ii) Solid W weighs 12 N in air, 2 N ¡n water and 4 N in another liquid. Determine the density of the other liquid.
(c) Figure 7 shows two identical wooden blocks each of mass 0.2 kg suspended in water by two strings M and N.

Given that the upthrust on each block is 3.2 N, determine the tension in string;
(i) M,
(ii) N.
(d) State any one application of hydrometers.

answers

(a) A floating body displaces its own weight of the fluid in which it floats.

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K.C.S.E Physics Q & A - MODEL 2014PP1QN19

23/7/2020

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K.C.S.E Physics Q & A - MODEL 2014PP1QN19

Figure 11 shows a test—tube whose cross-sectional area is 2 cm² partially filled with lead shot floating vertically in water.

(Take gravitational acceleration as 10 ms^-2 and density of water p as 1 g cm³)
(a) (i) Determine the:
I volume of the water displaced;
II weight of water displaced.
(ii) State the combined weight of the test—tube and the lead shot.
(iii) Determine the length of the test—tube that would be submerged in a liquid of density 0.8 g cm³
. (b) The set tip in figure 11 can be used as a hydrometer to measure densities of liquids.
State how such a hydrometer would be improved to measure small differences in densities of liquids.

answers

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K.C.S.E Physics Q & A - MODEL 2013PP1QN18

22/7/2020

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K.C.S.E Physics Q & A - MODEL 2013PP1QN18

(a) Figure 12 shows a weighing balance on which a beaker containing some water is placed. The reading on the balance is 2.80 N. A metal block weighing 2.7 N is suspended from a spring balance

(i) State what is observed on the spring balance and the weighing balance, as the metal block is gradually lowered into the water.
(I) Observation on spring balance.
(II) Observation on weighing balance.
(ii) Explain the observation made on the spring balance in (I).
(iii) When the metal block is fully immersed in the water, the reading on the spring balance is found to be 2.46 N. Determine the:
(I) reading on the weighing balance.
(II) density of the metal.
(c) Figure 13 shows a hydrometer with a thin stem floating in water in a beaker.

State with a reason what is observed on the hydrometer when the temperature of the water is raised.

answers

(a) (i) (I) - Reading decreases on spring balance;
(II) - Reading on weighing balance increases.
(ii) As the block is lowered, upthust increases; and hence it apparently weighs less;

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K.C.S.E Physics Q & A - MODEL 2012PP1QN18

21/7/2020

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K.C.S.E Physics Q & A - MODEL 2012PP1QN18

(a) Figure 12 shows a set up used to determine the mass of a solid S. The rod is pivoted at its centre of gravity C.

(i) State two measurements that need to be made to determine the mass of solid S.
(ii) Write an expression to show how the measurements in (i) above are used to obtain the mass of S.
(b) Figure 13 shows a log of wood of mass 20 kg submerged in water in a pond and held in position by a string fixed to the bottom of the pond.

Given that the density of water is 1000 kgm³ and that of wood is 800 kgm³, determine the; (i) Volume of the log. (ii) Upthrust on the log. (iii) Tension in the string.

answers

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K.C.S.E Physics Q & A - MODEL 2011PP1QN019

19/7/2020

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K.C.S.E Physics Q & A - MODEL 2011PP1QN019

(a) State the condition necessary for a body to float in a fluid.
(b) A ship made of steel is observed to float on water yet the density of steel is approximately eight times that of water. Explain this observation.
(c) Figure 17 shows three stages of an experiment to determine relative density of cork which normally floats on water. To make it sink, a sinker is hung below the cork.

In (1) a spring balance is used to measure the weight W of the cork in air.
In (II) the spring balance is used to measure the apparent weight W1, when only the sinker is submerged in water.
In (Ill) the spring balance is used to measure the apparent weight W2 when both the cork and the sinker are submerged.
The following observations were made.
W = 0.08N
W = 0.60N
W2 = 0.28N
Use this information to determine the:
(i) Upthrust on cork.
(ii) relative density of cork.
(d) Figure 18 shows parts of a simple submarine, a ship that can travel both on water and under water.
To do this water is pumped in or out of the ballast tanks.

Explain how the tanks are used to change the depth of the submarine.

answers

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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 2017PP1QN17

K.C.S.E Physics Q & A - MODEL 2017PP1QN17

K.C.S.E Physics Q & A - MODEL 2014PP1QN19

K.C.S.E Physics Q & A - MODEL 2014PP1QN19

Figure 11 shows a test—tube whose cross-sectional area is 2 cm² partially filled with lead shot floating vertically in water.

K.C.S.E Physics Q & A - MODEL 2013PP1QN18

K.C.S.E Physics Q & A - MODEL 2013PP1QN18

K.C.S.E Physics Q & A - MODEL 2012PP1QN18

K.C.S.E Physics Q & A - MODEL 2012PP1QN18

Given that the density of water is 1000 kgm³ and that of wood is 800 kgm³, determine the; (i) Volume of the log. (ii) Upthrust on the log. (iii) Tension in the string.

K.C.S.E Physics Q & A - MODEL 2011PP1QN019

K.C.S.E Physics Q & A - MODEL 2011PP1QN019

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K.C.S.E Physics Q & A - MODEL 2017PP1QN17

K.C.S.E Physics Q & A - MODEL 2017PP1QN17

K.C.S.E Physics Q & A - MODEL 2014PP1QN19

K.C.S.E Physics Q & A - MODEL 2014PP1QN19

Figure 11 shows a test—tube whose cross-sectional area is 2 cm2 partially filled with lead shot floating vertically in water.

K.C.S.E Physics Q & A - MODEL 2013PP1QN18

K.C.S.E Physics Q & A - MODEL 2013PP1QN18

K.C.S.E Physics Q & A - MODEL 2012PP1QN18

K.C.S.E Physics Q & A - MODEL 2012PP1QN18

Given that the density of water is 1000 kgm3 and that of wood is 800 kgm3, determine the; (i) Volume of the log. (ii) Upthrust on the log. (iii) Tension in the string.

K.C.S.E Physics Q & A - MODEL 2011PP1QN019

K.C.S.E Physics Q & A - MODEL 2011PP1QN019

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

Figure 11 shows a test—tube whose cross-sectional area is 2 cm² partially filled with lead shot floating vertically in water.

Given that the density of water is 1000 kgm³ and that of wood is 800 kgm³, determine the; (i) Volume of the log. (ii) Upthrust on the log. (iii) Tension in the string.