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- Give a reason why the inside of a helmet is lined with sponge.(Solved)
Give a reason why the inside of a helmet is lined with sponge.
Date posted: September 11, 2019.
- State one application of cooling caused by evaporation.(Solved)
State one application of cooling caused by evaporation.
Date posted: September 11, 2019.
- Study the sketch map of Ghana below and use it to answer the following questions(Solved)
Study the sketch map of Ghana below and use it to answer the following questions.
a) Name
(i) The cocoa growing areas marked U, V and W
ii) The port cities marked P and Q
b) State five physical conditions favoring cocoa growing in Ghana
c) Describe the stages involved in cocoa processing in Ghana.
d) Explain four economic problems facing cocoa farmers in Ghana
Date posted: September 11, 2019.
- A certain powder of mass 100g was heated in a container by an electric heater rated 100w for some time. The graph below shows the...(Solved)
A certain powder of mass 100g was heated in a container by an electric heater rated 100w for some time. The graph below shows the variation of the temperature of the powder with time.
Use the graph to:
(i) Determine the melting point of the powder
(ii) Determine the quantity of heat supplied by the heater from the time the powder starts to melt to the time it has melted.
(iii) Determine the specific latent heat of fusion of the powder assuming the container absorbs negligible amount of heat.
Date posted: September 11, 2019.
- Experiment was set as shown below.(Solved)
Experiment was set as shown below.
(a) What is observed on the bulb when the switch is closed?
(b) Which electrode will be cathode?
(c) Write down the half-cell equations for:
(i) Copper electrode.
(ii) Zinc electrode.
(d) Write the overall ionic equation for the electrochemical cell.
(e) The table below shows the electrode potentials.
What is the value of the voltage of the cell?
(f) The switch is kept closed. State and explain the observation expected after sometime on the
(i) The zinc rod.
(ii) Copper (II) Sulphate solution.
Date posted: September 11, 2019.
- The product of the first three terms of geometric progression is 729.(Solved)
The product of the first three terms of geometric progression is 729. If the first term is a and the common ratio is r.
(a) Express r in terms of a.
(b) Given the sum of the three terms is 39.
(i) Find the values of a and r and hence write down two possible sequences each up to the 4th term.
(ii) Find the product of the 10th term of the two sequences.
Date posted: September 11, 2019.
- The figure below represents a block of uniform cross-sectional area 6.0cm² floating on two liquids A and B. The length of the block in each...(Solved)
The figure below represents a block of uniform cross-sectional area 6.0cm² floating on two liquids A and B. The length of the block in each liquid is shown.
Given that the density of liquid A is 800kg/m³ and that of liquid B is 1000kg/m³
determine.
(i) Weight of liquid A displaced.
(ii) Weight of liquid B displaced.
(iii) Density of the block.
Date posted: September 11, 2019.
- State three observations that that you can make in the forest to indicate that the forest is well managed.(Solved)
State three observations that that you can make in the forest to indicate that the forest is well managed.
Date posted: September 11, 2019.
- The diagram below shows triangle ABC, such that CA = 2a and CB = 3b.(Solved)
The diagram below shows triangle ABC, such that CA = 2a and CB = 3b. M is the midpoint of CA. N is a point on AB such that 2 AN = NB and R is a point on AB produced such that 2 AR = 5RB. If K is the point of intersection of MR and CN,
(a) Express in terms of a and b.
(i) AB.
(ii) CN.
(iii) BR.
(iv) MR.
(v) CK.
(b) Find the ratio CK: KN.
Date posted: September 11, 2019.
- Study the map of East Africa below and use it to answer question.(Solved)
Study the map of East Africa below and use it to answer question.
a)Identify the minerals in the parts marked A, B, C and D.
(b)
(i) Apart from solution method, give three other methods of underground mining..
(ii) Describe how minerals are extracted using solution method.
(c) State four negative effects of mining on the environment.
(d) Explain four contributions of petroleum production to the economies of Middle East countries.
Date posted: September 11, 2019.
- The figure below shows two forces F1 and F2 acting on an object.Show on the same figure the resultant force.(Solved)
The figure below shows two forces F1 and F2 acting on an object.Show on the same figure the resultant force.
![pic1192019951.png](/questions/uploads/pic1192019951.png)
Date posted: September 11, 2019.
- Two quantities P and r are connected by the equation P = Krn. Where k and n are constants.The table of values of P and...(Solved)
Two quantities P and r are connected by the equation P = Krⁿ. Where k and n are constants.The table of values of P and r is given below.
(a) State the linear equation connecting P and r.
(b) (i) Using a suitable scale, draw a suitable line graph from the above data on the grid provided.
(ii) Using your graph, estimate the values of K and n.
(c) Find the relation connecting P and r.
Date posted: September 11, 2019.
- An aircraft 320m from the ground travelling horizontally at 50m/s releases a bomb. Calculate the horizontal distance covered by the bomb from the point of...(Solved)
An aircraft 320m from the ground travelling horizontally at 50m/s releases a bomb. Calculate the horizontal distance covered by the bomb from the point of release (ignore air resistance and g = 10m/s²).
Date posted: September 11, 2019.
- The table below shows the value in Ksh Million of exports from Kenya and imports from the main geographical regions of the world in 2016....(Solved)
The table below shows the value in Ksh Million of exports from Kenya and imports from the main geographical regions of the world in 2016. Use it to answer question (a) and (b).
(a)
(i) What is the difference in value between exports and imports from Africa?
(ii) Calculate the total value of imports in the year 2016.
(iii) What is the percentage of the region with the least export value in 2016?
(b)
(i) A part from comparative bar graphs, give two other statistical methods that can be usedto present the data in the table.
(ii) Using a vertical scale of 1cm to represent Ksh 50 Billion, draw a comparative bar graph to present the data.
(iii) State three conclusions that can be made from the graph that you have drawn.
(c) State four characteristics of bar graphs.
Date posted: September 11, 2019.
- A cork enclosing steam in a boiler is held down by the system shown below.(Solved)
A cork enclosing steam in a boiler is held down by the system shown below.
If the area of the cork is 20cm², and the force F is 300N, determine the pressure of the steam in the boiler.
Date posted: September 11, 2019.
- The table below shows the distribution of marks scored by 50 students of Afraha high.(Solved)
The table below shows the distribution of marks scored by 50 students of Afraha high.
Calculate:-
(a) interquartile range.
(b) Mean mark
(c) Standard deviation
Date posted: September 11, 2019.
- Every morning during class time, Brenda either reads a novel or solves Mathematics questions. The
probability that she reads a novel is 4/5. (Solved)
Every morning during class time, Brenda either reads a novel or solves Mathematics questions. The probability that she reads a novel is 4/5. If she reads a novel, there is a probability of 3/7 that she will fall asleep. If she solves Math’s questions there is a probability of 1/2 that she will fall asleep. Sometimes the teacher on duty enters Brenda’s classroom. When Brenda is asked whether she had been a sleep, there is a probability of 1/5 that she will admit that she had been asleep and a probability of 3/5 that she will claim to have been asleep.
Using a tree diagram;
Find the probability that
(i) She sleeps and admits it.
(ii) She sleeps and does not admit.
(iii) She does not sheep but claims to have been asleep.
(iv) She does not sleep and says that she has not been a slept.
(v) She sleeps and admits and changes her mind.
Date posted: September 11, 2019.
- The figure below shows a solid sphere with its centre of gravity marked with a dot. The sphere is rolled on a horizontal ground and...(Solved)
The figure below shows a solid sphere with its centre of gravity marked with a dot. The sphere is rolled on a horizontal ground and comes to rest after Some time.Sketch the sphere and mark with a dot the most likely position of the c.o.g after it comes to rest.
![pic1192019939.png](/questions/uploads/pic1192019939.png)
Date posted: September 11, 2019.
- The enthalpies of combustion of carbon, hydrogen and ethanol are given below.(Solved)
The enthalpies of combustion of carbon, hydrogen and ethanol are given below.
i) Draw an energy cycle diagram that links the enthalpy of formation of ethanol to enthalpies of combustion of Carbon,hydrogen and ethanol.
ii) Determine the enthalpy of formation of ethanol
Date posted: September 11, 2019.
- The figure below shows water level in limb Q of a glass tube. Indicate the corresponding water levels in limb N, O and P.Explain your...(Solved)
The figure below shows water level in limb Q of a glass tube. Indicate the corresponding water levels in limb N, O and P.Explain your answer.
![pic1192019933.png](/questions/uploads/pic1192019933.png)
Date posted: September 11, 2019.
- (a) Fill the table below using the following function y = 3 + 4x - 2x²(Solved)
(a) Fill the table below using the following function y = 3 + 4x - 2x²
(b) On the grid provided, draw the graph of the function y = 3 + 4x - 2x²
(c) Using your graph; estimate the roots of the equations:-
(i) 3 + 4x = 2x².
(ii) 2x²- 3x - 6 = 0.
(d) State the y – co-ordinate of the maximum turning point.
Date posted: September 11, 2019.
- The figure below shows two identical burning splints. Placed on wood and metal blocks respectively it was observed that when the flame reached the edge...(Solved)
The figure below shows two identical burning splints. Placed on wood and metal blocks respectively it was observed that when the flame reached the edge of the metal block the splint was extinguished while the other on the wooden block continued to burn. Explain this observation.
![pic11932019929.png](/questions/uploads/pic11932019929.png)
Date posted: September 11, 2019.
- When washing clothes, it is easier to remove the dirt using some warm water containing soap than cold water. Explain this observation.(Solved)
When washing clothes, it is easier to remove the dirt using some warm water containing soap than cold water. Explain this observation.
Date posted: September 11, 2019.
- The list below shows the formulae of some organic compounds. Use letters T1 to T6 to answer the questions that follow.(Solved)
The list below shows the formulae of some organic compounds. Use letters T1 to T6 to answer the questions that follow.
T1 – CH3CH2CH2CH2CH3
T2 – CH3CH2CH2COOC2H5
T3 – CH3CH2CH2CH2OH
T4– CH3CH2CH2COOH
T5 – CH3CH2CHCH2
T6 – CH3CCCH3
(a) Select two compounds which:
(i) Are not hydrocarbons
(ii) Would decolourise both bromine water and acidified potassium manganite (VII)
(iii) Would produce hydrogen gas when reacted with potassium metal
(b) Select a compound which would produce bubbles of a gas when reacted with sodium carbonate.
(c) (i) Identify the compound that is likely to undergo polymerization. Give a reason for your answer. Using two molecules show how polymerization occurs.
I. Compound
II. Reasons
III. Polymerization
IV Name the process by which compound T2 is formed and identify the compounds that were used to form it.
I. Process
II.Compounds
(d) Compound T3 can be converted to T4 as shown by the equation below:
C4H9OH(l) + O2(g)----->C3H7COOH(aq) + H2O(l)
Given the following information:
Determine the heat change for the reaction above.
Date posted: September 11, 2019.
- The figure below shows an arc of a circle through three points A, B and C.(Solved)
The figure below shows an arc of a circle through three points A, B and C.
Calculate the co-ordinates of the centre of the circle.
Date posted: September 11, 2019.
- Water flows through a pipe whose cross sectional radius is 3.5cm at a rate of 3m/min.(Solved)
Water flows through a pipe whose cross sectional radius is 3.5cm at a rate of 3m/min. Calculate how long it will take the pipe to fill a 22000 litre Kentank.
Date posted: September 11, 2019.
- Name two indigenous breeds of cattle kept by nomadic pastoralists in Kenya.(Solved)
Name two indigenous breeds of cattle kept by nomadic pastoralists in Kenya.
Date posted: September 11, 2019.
- Give two forms of commercial livestock farming.(Solved)
Give two forms of commercial livestock farming.
Date posted: September 11, 2019.
- State four reasons why British Columbia region in Canada is a major producer of softwoods.(Solved)
State four reasons why British Columbia region in Canada is a major producer of softwoods.
Date posted: September 11, 2019.
- The position vectors of points A and B are 2i – j + 4K and 4i + 3j respectively.(Solved)
The position vectors of points A and B are 2i – j + 4K and 4i + 3j respectively. If point R is the midpoint of AB . Find the magnitude of AR
Date posted: September 11, 2019.