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- In a certain reaction, 18.7cm3 of a dibasic acid H2 X required 25cm3 of 0.1M NaOH for complete neutralization.
(a) How many moles of Sodium...(Solved)
In a certain reaction, 18.7cm3 of a dibasic acid H2 X required 25cm3 of 0.1M NaOH for complete neutralization.
(a) How many moles of Sodium hydroxide are contained in 25cm3?
(b) Calculate the molarity of the dibasic acid.
Date posted: September 10, 2019.
- The figure below shows some resistors connected in part of a circuit.Determine the effective resistance.(Solved)
The figure below shows some resistors connected in part of a circuit.Determine the effective resistance.
Date posted: September 10, 2019.
- The table below shows the masses of population randomly chosen in a certain town in kilogrammes.(Solved)
The table below shows the masses of population randomly chosen in a certain town in kilogrammes.
(a) Represent this information on a histogram.
(b) Draw a frequency polygon.
(c) Calculate the mean of the population in this town.
Date posted: September 10, 2019.
- The figure below shows a large battery connected a resistor of 1000 ohms. The potential difference across the resistor is 50V.(Solved)
The figure below shows a large battery connected a resistor of 1000 ohms. The potential difference across the resistor is 50V.
Determine:
(i) The ammeter reading (A).
(ii) The electrical energy dissipated by the resistor in one minute.
Date posted: September 10, 2019.
- (a) Complete the table below to 2 decimal places for
y = -x3 – x2 + 3x + 1(Solved)
(a) Complete the table below to 2 decimal places for
y = -x3 – x2 + 3x + 1
(b) On the grid provided, draw the graph for y = -x3 – x2 + 3x + 1 for -4 < x < 3.
(c) Use the graph to solve the equation -x3 – x2 + 3x + 1=0
(d) By drawing a suitable straight line on the graph, solve -x3 – x2 + 3x + 1 = -2x
Date posted: September 10, 2019.
- The figure below shows a diode D connected to a source of a.c current and a resistor.Sketch in the axis below the output observed in...(Solved)
The figure below shows a diode D connected to a source of a.c current and a resistor.
Sketch in the axis below the output observed in the C.R.O.
![pic1092019938.png](/questions/uploads/pic1092019938.png)
Date posted: September 10, 2019.
- The diagram below shows a set-up of apparatus that can be used to prepare nitrogen (IV) oxide. Study it and use it to answer the...(Solved)
The diagram below shows a set-up of apparatus that can be used to prepare nitrogen (IV) oxide. Study it and use it to answer the questions that follow.
(i) Write the equation for the reaction that takes place in the boiling tube.
(ii) State the observations made in the boiling tube.
(iii) Explain why lead (II) nitrate is preferred over other metal nitrates in this experiment.
(iv) Describe how gas A can be identified.
(b) (i) Name liquid B
(ii) Write a chemical equation to show how liquid B is formed in this experiment.
(c) (i) In another experiment, excess aqueous lead (II) nitrate solution was reacted with a solution which contained 2.34g of sodium chloride. Calculate the mass of precipitate formed in this reaction. (Pb = 207, Cl = 35.5, Na = 23)
(ii) Write an ionic equation for the reaction that takes place when nitrogen (IV) oxide reacts with aqueous sodium hydroxide.
Date posted: September 10, 2019.
- A heater of resistance R1 is rated P watts, V volts while another of resistance R2 is rated 2P watts, V/2 volts. Determine the ratio...(Solved)
A heater of resistance R1 is rated P watts, V volts while another of resistance R2 is rated 2P watts, V/2 volts. Determine the ratio R1 to R2.
Date posted: September 10, 2019.
- A metallic cuboid 8cm by 10cm by 14cm is melted.(Solved)
A metallic cuboid 8cm by 10cm by 14cm is melted. Half of it is used to make a cylinder of radius 4.2cm, the remaining is used to make a sphere. Determine using pi= 22/7
(a) The height and surface area of the cylinder to 1 decimal place.
(b) The radius and surface area of the sphere correct to 1 decimal place.
Date posted: September 10, 2019.
- A and B are two points 10cm apart.(Solved)
A and B are two points 10cm apart.
(a) Draw a circle centre A, radius 2cm and a circle centre B, radius 4cm.
(b) Draw a transverse common tangent to the two circles.
(c) Find by calculation the length of a direct common tangent correct to 3 significant figures.
Date posted: September 10, 2019.
- The flow chart below shows some processes in the extraction of zinc. Study it and answer the questions that follow.(Solved)
The flow chart below shows some processes in the extraction of zinc. Study it and answer the questions that follow.
(a) Name the processes represented by A and E.
(b) State the reagents required for processes B, C and D.
(c) Write a chemical equation of the reaction that occurs in process B.
(d) With an aid of a diagram, explain how you would obtain a pure sample of zinc by process E
(e) State two commercial uses of zinc metal.
Date posted: September 10, 2019.
- State the name of the eye defect corrected by convex lens.(Solved)
State the name of the eye defect corrected by convex lens.
Date posted: September 10, 2019.
- In the figure below, SP is parallel to QR.(Solved)
In the figure below, SP is parallel to QR.
(i) Show that triangles SPX and RQX are similar.
(ii) If PS = 8cm, PX = 6cm, SX = 4cm and RX = 3cm, find the length of RQ and QX.
Date posted: September 10, 2019.
- The figure below shows the path of light through a transparent material placed in air.(Solved)
The figure below shows the path of light through a transparent material placed in air.
Calculate the refractive index of the transparent material.
Date posted: September 10, 2019.
- A fathometer produces sound in a ship and receives two echo‘s where there is a raised sea bank. One after 2.5 seconds and the other...(Solved)
A fathometer produces sound in a ship and receives two echo‘s where there is a raised sea bank. One after 2.5 seconds and the other after 3.0 seconds. Find the height of the raised sea bank if the velocity of sound in water is 1460m/s.
Date posted: September 10, 2019.
- The ratio of a spherical balloon increases by 4%. Find the percentage increase in its;(Solved)
The ratio of a spherical balloon increases by 4%. Find the percentage increase in its;
(a) Surface area.
(b) Volume
Date posted: September 10, 2019.
- The figure below shows a progressive wave incident from a shallow end to a deep end.(Solved)
The figure below shows a progressive wave incident from a shallow end to a deep end.
Sketch the appearance of the wave in the deep region.
Date posted: September 10, 2019.
- The diagram ABCD is a parallelogram. Line BE is parallel to line FD.(Solved)
The diagram ABCD is a parallelogram. Line BE is parallel to line FD. Show that triangles ABE and CDF are congruent. Show that triangles ABE and CDF are congruent.
![q161092019900.png](/questions/uploads/q161092019900.png)
Date posted: September 10, 2019.
- The enthalpies of combustion of calcium, carbon and decomposition of calcium carbonate are indicated below;(Solved)
The enthalpies of combustion of calcium, carbon and decomposition of calcium carbonate are indicated below;
(i) Draw an energy cycle diagram that links the enthalpy of formation of calcium carbonate to enthalpies of combustion of calcium, carbon and decomposition of calcium carbonate.
(ii) Determine the enthalpy of formation of calcium carbonate.
Date posted: September 10, 2019.
- How many terms of the arithmetic series 2, 5, 8, 11 …. May be added to make their sum 301?(Solved)
How many terms of the arithmetic series 2, 5, 8, 11 …. May be added to make their sum 301?
Date posted: September 10, 2019.
- The graph below is a velocity time graph(Solved)
The graph below is a velocity time graph
Determine the acceleration in the sections:
(a)
(i) CD
(ii) DE
(b) Calculate the total distance covered.
Date posted: September 10, 2019.
- The figure below shows an object placed infront of a concave mirror.Use rays to locate the position of the image.(Solved)
The figure below shows an object placed infront of a concave mirror.Use rays to locate the position of the image.
![pic1092019851.png](/questions/uploads/pic1092019851.png)
Date posted: September 10, 2019.
- Study the scheme below and answer the questions that follow.(Solved)
Study the scheme below and answer the questions that follow.
(i) What name is given to the type of cleansing agent prepared by the method above?
(ii) Name one chemical substance added in step II
(iii) What is the purpose of adding the chemical substance named in a (ii) above?
(iv) Name any other suitable substance that can be used in step I
(v) Explain how an aqueous solution of the cleansing agent removes oil during washing
Date posted: September 10, 2019.
- The gradient of the curve is ax2 + 3x at x = 2 is 8.(Solved)
The gradient of the curve is ax2 + 3x at x = 2 is 8. Find the value of a.
Date posted: September 10, 2019.
- Explain the difference in meaning between the following pairs of sentences.(Solved)
Explain the difference in meaning between the following pairs of sentences.
a) (i) A Mr. Gitau came to see you when you were out.
(ii) Mr. Gitau came to see you when you were out.
b) (i) Lydia found the empty room.
(ii) Lydia found the room empty.
c) (i) She went and bought herself a skirt.
(ii) She went and bought a skirt herself.
d) (i) The guests who have badges will park at the yard.
(ii) The guests, who have badges, will park at the yard.
e) (i) Mary even learnt how to write.
(ii) Even Mary learnt how to write.
f) (i) The book which got lost is mine.
(ii) The book, which got lost, is mine.
g) (i) Harry, our elder brother, has arrived.
(ii) Harry, our elder brother has arrived.
h) (i) My uncle stopped to drink.
(ii) My uncle stopped drinking.
i) (i) Peter was executed like a murderer.
(ii) Peter was executed as a murderer.
j) (i) The injured student did not die happily.
(ii) The injured student did not die, happily.
k) i) I only heard the news briefly.
ii) I only heard the news in brief
l) (i) Mutunga has ten-day-old puppies in his kennel.
(ii) Mutunga has ten day-old puppies in his kennel.
Date posted: September 10, 2019.
- Factorise xy – zy – xw + zw hence simplify the expression completely.(Solved)
Factorise xy – zy – xw + zw hence simplify the expression completely.
![q111092019844.png](/questions/uploads/q111092019844.png)
Date posted: September 10, 2019.
- The figure below shows two identical bulbs connected in two circuits. The cells are of the same e.m.f.
Compare the brightness of the bulbs in (a)...(Solved)
The figure below shows two identical bulbs connected in two circuits. The cells are of the same e.m.f.
Compare the brightness of the bulbs in (a) and (b).
![pic1092019844.png](/questions/uploads/pic1092019844.png)
Date posted: September 10, 2019.
- Given the matrix(Solved)
Given the matrix
(a) Determine y2
(b) If y2 = I, determine the possible values of c and d.
Date posted: September 10, 2019.
- A string of length 70cm is used to whirl a stone of mass 0.5kg in a circle of a vertical plane at 5 rev/s. Determine.
(i)...(Solved)
A string of length 70cm is used to whirl a stone of mass 0.5kg in a circle of a vertical plane at 5 rev/s. Determine.
(i) The period.
(ii) The angular velocity.
(iii) The centripetal force.
Date posted: September 10, 2019.
- Expand (v5 + v3) (v5 – v3) hence or otherwise simplify by rationalising the denominator of (Solved)
Expand (√5 + √3) (√5 – √3) hence or otherwise simplify by rationalising the denominator of
Date posted: September 10, 2019.