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Use logarithm table to evaluate:
Date posted:
September 20, 2019
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Study the flow chart below and answer the questions that follow
Process Y
i. Write the formula of Alcohol X, Compound Z and name process Y.
ii. Propane and Chlorine react as shown below :
a) Name the type of reaction that takes place.
b) State the condition under which this reaction takes place.
Date posted:
September 20, 2019
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The curve y=3x2- 6x + 6 passes through the point s ( 2,3)
(a)Determine the gradient function of the curve.
(b) Find the co-ordinates of the turning point of the curve.
(c) Determine whether the point is a minima or a maxima.
(d) Find the equation of the
(i) Tangent to the curve at S.
(ii) Normal to the curve at S.
Date posted:
September 20, 2019
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The relationship between two variables S and T is given by the equation S = KTn where K and n are constants.
(a) Write down the linear equation relating to S and T
(b) Hence complete the table above for the linear equation relating to S and T.
(c) Draw a suitable straight line graph to represent the data.
(d) use your graph to determine the values of K and n.
(e) find the value of S when T = 3.5
Date posted:
September 20, 2019
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Three quantities P,Q,and R are such that P varies jointly with Q and the square of R . if P = 900 when
Q = 20 and R = 3
Find (i) an equation connecting P, Q and R
(ii) the value of R when Q = 10 and P = 800
Date posted:
September 20, 2019
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Equal masses of magnesium ribbon were reacted separately with equal volumes of 1M hydrochloric acid and 1M methanoic acid. The results were plotted on a graph as shown below. Two curves X and Y were obtained.
a) Explain which curves represents:
i) 1M hydrochloric acid.
ii) 1M Methanoic acid.
b) State the significance of point Z.
c) Write ionic equation for the reaction between magnesium and dilute hydrochloric acid.
d) Calculate the maximum mass of the gas that would be liberated if 1.2g of magnesium reacted with excess hydrochloric acid.
(Mg = 24, H =1).
e) Calculate the volume of the gas produced in (e) above at r.t.p (molar gas volume at r.t.p) = 24dm3.
Date posted:
September 20, 2019
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The arrangements below shows a set-up to investigate the effect of an electric current on molten lead (II) iodide.
a) Identify two mistakes in the set-up.
b) State three observations made after correcting the mistakes.
c) What particles are responsible for electrical conductivity?
d) Write the equations for the reactions taking place at the electrodes.
e) Indicate on the diagram direction of flow of electric current.
Date posted:
September 20, 2019
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A supermarket is stocked with plates which come from two suppliers A and B. They are bought in the ratio of 3:5 respectively, 10% of plates from A are defective and 6% of the plates from B are defective.
(a) A plate is chosen by a buyer at random. Find the probability that;
(i) it is from A
(ii) it is from B and it is defective.
(iii) it is defective
(b) Two plates are chosen at random. Find the probability that:
(i) both are defective
(ii) at least one is not defective.
Date posted:
September 20, 2019
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In a square PQRS, A is the mid-point of PQ and B is the mid-point of QR, while C is a point on BP such that 2BC = 3CP. The co-ordinates of P, Q and S are (4,4), (14,4) and (4,14) respectively. Find:
(a) (i) the column vectors of PQ and PS.
(ii) co-ordinates of R
(b) Show that A, C, S are collinear.
Date posted:
September 20, 2019
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Eleza jinsi uwililugha unaweza kuleta athari katika lugha na mawasiliano miongoni mwa wanajamii.
Date posted:
September 19, 2019
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Eleza juhudi zozote tano zinazotumiwa kukiendeleza Kiswahili sanifu nchini Kenya.
Date posted:
September 19, 2019
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Tambua shamirisho kipozi, kitondo na shamirisho ala katika sentensi ifuatayo.
Baba amemnunulia mtoto fulana nzuri iliyoshonwa kwa uzi mwekundu.
Date posted:
September 19, 2019
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Kwa kutungia sentensi, tofautisha vitate hivi.
i) Ghali
ii) Gari
Date posted:
September 19, 2019
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Tumia ‗O‘ rejeshi.
i) Msichana ambaye huja ni mwanasheria
ii) Maovu ambayo aliyatenda hayasahauliki
Date posted:
September 19, 2019
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Andika katika hali ya udogo
Mbwa mwenye ukali alimfukuza mtoto
Date posted:
September 19, 2019
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Tunga sentensi kwa kutumia nomino katika ngeli ya pa- ku- mu.
Date posted:
September 19, 2019
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Taja irabu mbili za nyuma kisha ueleze kwa nini huitwa hivyo.
Date posted:
September 19, 2019
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In the figure below O is the centre of the circle and PTQ is the tangent at T. If PT=ST and angle SRT=52o. Determine the size of the angles below giving reasons:
(a) PTS
(b) RTQ
(c) TSR
(d) TQR
(e) PSQ
Date posted:
September 19, 2019
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In an experiment to investigate the action of pepsin on egg albumen, equal amount of pepsin were added to equal amount of egg albumen in different test tube. The test tubes were placed in water bath at different temperature. The graph below shows the time taken for the enzymes to digest protein at each temperature.
a) What is the optimum temperature for enzymes?
b) Account for the time taken to digest egg albumen at 600C.
c) With reason name the form in which the enzymes pepsin is secreted.
d) State three other factors that affect enzyme controlled reactions.
Date posted:
September 19, 2019
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The flow chart below, illustrates blood circulation in certain organs in humans.
a) Name the organ labeled A.
b) Name the blood vessel labeled B and F.
c) State how the consumption of blood in vessel E differs from that in vessel.
d) Name two hormones whose target is the liver when there is variation in simple carbohydrates concentration in blood.
Date posted:
September 19, 2019
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The figure below shows part of a food web for the South Atlantic ocean.
a) i) Name the producer in this food web.
ii) Name the top carnivore in this food web.
b) construct a food chain in which leopard seal is a tertiary consumer.
c) In the future, the extraction of mineral resources in the Antarctic might occur on a large scale. This could destroy the breeding-grounds of the Ross seal.
i) State and explain the effects this might have on the population of leopard seal.
ii) List two human activities that can affect the population of organisms in the ecosystem represented by food web.
d) Name the organism with the highest number of predators.
Date posted:
September 19, 2019
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Given that 9x2+36x-40+k is a perfect square, find the value of k.
Date posted:
September 19, 2019
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The diagram below illustrates the behaviour of red blood cells when placed in two different solutions X and Y.
i) Name the process represented by letter A and B.
ii) Identify the type of solution that would prevent processes A and B from taking place when the cells are placed in it.
iii) Draw a diagram to illustrate how a plant cell would appear if placed in solution Y.
Date posted:
September 19, 2019
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Name a chemical reagent that can be used to preserve specimens.
Date posted:
September 19, 2019
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Find the limits within which the area of a parallelogram whose base is 8cm and height is 5cm lies. Hence find the relative error in the area.
Date posted:
September 19, 2019
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At Mweinga farm, a cow takes at least 180 units of vitamin A and not less than 160 units of vitamin B. Vitamin A and B are available in two types of feeds, x and y. Type x feeds contains 45 units per kg of vitamin A and 20 units per kg of vitamin B while type Y feeds contains 30 units per kg of vitamin A and 40 units of vitamin B. Taking x and y to be the number of Kgs of feed x and y respectively taken by the cow per day.
a)Form all the inequalities that represent the above information.
b)Show the region described by the all inequalities in (a) above graphically.
c)Given that 1kg of x costs sh40 and 1kg of y costs sh50, use your graph in (b) above to determine the least cost of maintaining a cow at the Mweinga farm.
Date posted:
September 19, 2019
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Study the set-up of apparatus below and answer the questions that follow.
a) State and explain the observation that would be made in tube L as the experiment progresses in the first few minutes.
Observation.
Explanation.
b) How would the observations in the tube L change if the experiment is carried out for a long time. Explain using a chemical equation.
Observation.
Equation.
c) State three observations made when liquid S is reacted with sodium metal.
d) State the use of the suction pump in this experiment.
Date posted:
September 19, 2019
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The table below shows the rate of taxation in a certain year.
Income in K£ p.a Rate of taxation shs per K£
1 – 3900 2
3901 – 7800 3
7801 - 11700 4
11701 – 15600 5
15601 – 19500 7
Above 19500 9
In that period Mrs. Kalii earns a basic salary of kshs22,000 and is entitled to a house allowance of ksh10,000 per month. If she gets a personal relief of sh.1056 per month.
a)Calculate how much income tax she paid per month.
b)Mrs. Kalii’s other deductions per month were;
-Co-operative society contributions of Ksh.2,000
-Loan repayment kshs.2260
-Provident fund deducted through check off system at 2% of his basic salary.
Calculate his net monthly pay.
Date posted:
September 19, 2019
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A industrialist has 450 litres of a chemical which is 70% pure. He mixes it with a chemical of the same type but 90% pure so as to obtain a mixture which is 75% pure. Find the amount of the 90% pure chemical used.
Date posted:
September 19, 2019
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When solid Zinc carbonate was added to a solution of hydrogen chloride in methylbenzene, there was no observable change.On addition of some water to the mixture there was effervescence. Explain these observations.
Date posted:
September 19, 2019