-
The diagram below represents the nitrogen cycle.
a) State the process labeled A and D.
b) Name the group of organism labeled .
c) Name the compound represented by B.
d) i) Name the group of plants which promote process A.
ii) State the part of the plant where process A takes place.
e) How would excess pesticides in the soil interfere with process A.
Date posted:
September 17, 2019
-
Active yeast cells were added to dilute sugar solution in a container. The mixture was left in a warm room. After a few hour bubbles of gases were observed escaping from the mixture.
a) Write an equation to represent the chemical process
b) What is the importance of the type of reaction in industries?
Date posted:
September 17, 2019
-
(a) An arithmetic progression is such that the first term is -5, the last is 135 and the sum of progression is 975. Calculate
(i) The number of terms in the series.
(ii) The common difference of the progression.
(b)The sum of the first three terms of a geometric progression is 27 and first term is 36.
Determine the common ratio and the value of the fourth term.
Date posted:
September 17, 2019
-
The figure below shows a right pyramid VABCD with a square base of side 6 cm. VA = VB = VC = VD = 12 cm
Calculate;
(i) The height of the pyramid correct to 2 d.p
(ii) The angle between the planes VAD and VBC correct to 2 significant figures.
Date posted:
September 17, 2019
-
Nairobi and Kisumu lie on the same longitude. The latitude of Nairobi is 1o12’s and that of Kisumu is
5o50’N. Calculate the distance between them in nautical miles
Date posted:
September 17, 2019
-
Taps A and B can fill a tank in 4 and 9 hours respectively. Both taps are turned on for 2 hours after which tap A is closed. Find how long tap B takes to fill the remaining part of the tank
Date posted:
September 17, 2019
-
Draw the structures of the following compounds.
i) Ethylbutanoate
ii) 3-ethyl – 3 – methyl hexane
Date posted:
September 17, 2019
-
100cm3 of0.05M Sulphuric (VI) acid were placed in the flask and small quantity of potassium Carbonate added. The mixture was boiled to expel all carbon (IV) oxide. 25cm3 of the resulting solution required 18cm3 of 0.1M potassium hydroxide solution to neutralize it. Calculate the mass of potassium carbonate added. (K = 39, O = 16, C = 12)
Date posted:
September 17, 2019
-
Four cylinders of potato were carefully dried on blotting paper and weighed. Each piece weighed 3g. One was placed in each as shown in the drawing below.
a) After 48hours, which potato would be the heaviest
b) Name the substance whose movement was responsible for the weight changes in potato cylinders.
c) Name the process which was responsible for this movement in tubes B, C and D.
Date posted:
September 17, 2019
-
Two variables P and Q are such that P varies partly as Q and partly as the square root of Q. Determine
the equation connecting P and Q when Q = 16, P = 500 and when Q = 25, P = 800.
Date posted:
September 17, 2019
-
The products formed by action of heat on nitrates of element X, Y and Z are shown below.
a) Arrange the metals in order of increasing reactivity.
b) Which element forms a soluble carbonate?
c) Give an element that can be Y.
Date posted:
September 17, 2019
-
The figure below represent a solid frustum. The faces ABCD and EFGH are parallel squares of sides 10cm and 6 cm respectively. Each of the slanting edges AE, BF, CG and DH are equal to 4cm.
Determine:
a)The length of the projection of AE on the plane ABCD
b)The angle between the line AE and the plane ABCD
c)The angle between the plane BCGF and ABCD
Date posted:
September 17, 2019
-
a) Draw a diagram to show how an iron ring can be electroplated with pure silver.
b)Give two reasons why electroplating is necessary.
Date posted:
September 17, 2019
-
Consider the flow chart below; use it to answer the questions that follow.
(i) State the most likely identity of solid F.
(ii) Write the chemical equation for the reaction between solid F and concentrated nitric (v) acid.
(iii) Name
Solution N
Solution H
(iv) Write the formula of solution N.
Date posted:
September 17, 2019
-
A bag contains blue, green and red pens of the same type in the ratio 8:2:5 respectively. A pen is picked at random without replacement and its colour noted.
a)Determine the probability that the first pen picked is
i)Blue
ii)Either green or red.
b)Using a tree diagram, determine the probability that
i)The first two pens picked are both green
ii)Only one of the first pens picked is red.
Date posted:
September 17, 2019
-
a)Name the class to which the following cleansing agents belong.
b) Which cleaning agent between (i) or (ii) above is preferred for cleaning garments while using water from a dam containing dissolved calcium chloride? Explain
Date posted:
September 17, 2019
-
Describe how a solid mixture of Zinc sulphate and lead (ii) Sulphate can be separated into Solid samples.
Date posted:
September 17, 2019
-
A globe representing the earth has a radius of 0.5m. point A(00, 100W), B (00, 350E), P(600N, 1100E) and Q(600N, 1200W) are marked on the globe.
a)Find the length of arc AB, leaving your answer in term of π
b)If O is the centre of the latitude 600N, find the area of the minor sector OPQ
c)Of the local time at Q is 10.30 a.m. on Monday, Determine the local time and day at P.
Date posted:
September 17, 2019
-
The table below shows the current taxation rates in Kenya
A member of parliament’s monthly earnings are as follows: Basic salary Kshs. 300 000, commuted mileage allowance of Kshs. 75 000, entertain allowance Ksh. 60 000, extraneous allowance Ksh. 30 000, house allowance Kshs. 70,000, car maintaince allowance Kshs 247 000. he is entitled to a personal relief of Kshs. 1162 every month.
a)If before the promulgation of the new constitution all the MP’s allowances were tax free, calculate the PAYE the MP’s used to pay
b)In the new constitution all the MP’s are taxed just like the other Kenyans. Calculate the percentage increase in the MP’s PAYE after the new law was passed.
Date posted:
September 17, 2019
-
Two large and one small pump can fill a swimming pool in 4 hours. One large and three small pumps can also fill the swimming pool in 4 hours. How many hours will it take 4 large and 4 small pumps.
Date posted:
September 17, 2019
-
Other than cost and ability to conduct, give two other reasons why aluminum is used for making overhead electric cables while magnesium is not.
Date posted:
September 17, 2019
-
In an experiment, Euglena was put in a petri dish. One side of the petri dish was illuminated and the other kept dark as shown below.
a) Name this type of response.
b) State the significance of this type of response in an organism.
c) Other than light, outline other two factors that may cause change of position in Euglena and state the respective type of response.
d) If the above experiment was repeated using a young potted seedling, name the type of response which will be observed.
e) Explain the behavior of the seedling after 3 days.
Date posted:
September 17, 2019
-
A student set up the apparatus as shown in the diagram below to prepare and collect dry ammonia gas.
(i) Identify one mistake in the set-up and give a reason.
(ii) Name a suitable drying agent for ammonia.
(iii) Write an operation for the reaction that occurred when a mixture of ammonium chloride and calcium hydroxide was heated.
(iv) Describe one chemical test for ammonia gas.
Date posted:
September 17, 2019
-
Study the reaction scheme below and answer the questions that follow.
a) Name; Gas M
Precipitate w
b) Write an equation for the formation of ;
The white solid
Colorless solution X
c) What name is given to the process that produce precipitate W
d) State two commercial uses of gas M
Date posted:
September 17, 2019
-
Below is a simplified diagram of the Downs cell in which sodium metal is manufactured.
(i) Identify electrolyte X and gas Y.
(ii)Give two properties of sodium that make it possible to collect as shown above.
(iii) Why is graphite preferred to steel as the anode?
(iv) Explain how sodium hydroxide pellets would be obtained from sodium amalgam?
Date posted:
September 17, 2019
-
What is the process that leads to addition or loss of one or more chromosomes?
Date posted:
September 17, 2019
-
Given that
Date posted:
September 17, 2019
-
Given the equation y = x2 – 5x +6
a)In the space provided below sketch the graph of the equation y = x2 – 5x +6
b)Write down the co – ordinates of the Y intercept and X intercept
c)Calculate the area grounded by the curve y = x2 – 5x +6 and the lines x = 0
and x= 4
Date posted:
September 17, 2019
-
Study the diagram below and answer the questions that follow.
a) Identify the apparatus.
b) State the functions of the part labeled x.
Date posted:
September 17, 2019
-
The figure below represents a section of the periodic table. Study it and answer the questions that follow. The letters do not represent the actual symbols of elements.
a) i).What chemical family does element J belong to?
ii. Compare the reactivity of element C and H. Explain.
b)
i) Write the chemical formula of the chloride of element D
ii) Name the type of structure of the chloride in b(i) above.
c). State and explain the difference in atomic radius and ionic radius of element F
d). Using dots (.) and crosses (x) show how bonding occurs when element E and F react.
Date posted:
September 17, 2019