-
The flow chart below and answer the questions that follow.
i). Identify the following;
Gas R
Solid M
Gas J
Liquid S
ii. Write a chemical equation for the formation of gas T
iii. Name catalyst K
iv) State two uses of liquid S
Date posted:
September 17, 2019
-
In a triangle below AOB, OA = a, OB = b, M is the midpoint of AB and N is a point on OB such that ON: NB = 1:2 AN and OM intersect at P
a) Express the following vectors in terms of a and b
AB
OM
AN
If OP = SOM express OP in terms of t, a and b
b) If AP = tAN express
AP in terms of t , a and b
c)Hence express OP in terms of t, a and b
d)Using the results above solve for s and t
Date posted:
September 17, 2019
-
The set apparatus was assembled by a group of students to investigate some physiological process.
a) i) Give two aims of the experiment.
ii) Explain observations expected after 24hrs.
b) Before the experiment, the glucose was boiled the cooled.
i) Why was it necessary to boil the solution?
ii) What was the importance of the oil layer in the experiment?
c) Describe a control experiment for the set up?
d) Suggest one industrial application of the process being investigated?
Date posted:
September 17, 2019
-
a) Given that y = 2cos (2x – 30)o is the equation of a curve state the amplitude and period of the curve
b)Given that y = -1 1/5 in the above function, find x where 
Date posted:
September 17, 2019
-
In an experiment, three healthy rabbits were fed with equal amounts of carbohydrates. After 1 hour their blood sugar glucose concentration was measured at 30 minutes intervals for 3 hour. The results are as shown in the table below.
a.(i) Calculate the mean glucose concentration 1mg/ml of blood at 60 and 180 minutes.
(ii) On the grid provided plot a graph of mean glucose concentration against time.
(iii) What was the mean concentration in the blood after 75 minutes?
(iv)Why was it necessary to use 3 rabbits in the experiment?
v) Account for differences in mean glucose concentration between initial time and 180 minutes.
(b) Name three products of digestion other than glucose
(c) What is the fate of excess glucose in:
(i) Plants?
(ii) Animals ?
Date posted:
September 17, 2019
-
Machine A can do a piece of work n 6 hours while machine B can do the same piece of work in 9 hours. Machine A was set to do the piece of work but after 3 hours it broke down and machine B did the rest of the work. Find how long would machine B take to do the rest of the work
Date posted:
September 17, 2019
-
The diagram below shows a section through the mammalian skin.
a. Name the parts labeled Y and X
b. State the function of the parts labeled W and Z
c. Explain the changes that occur on the skin when it is cold
Date posted:
September 17, 2019
-
The diagram below shows a flow chart of blood clotting mechanism in a human.
a) Name the enzymes represented by the letters T and S.
b) Name the final products of the mechanism represented by letter R.
Date posted:
September 17, 2019
-
60cm3 of oxygen gas diffused through a porous partition in 50 seconds. How long will it take 120cm3 of sulphur (IV) oxide gas to diffuse through the same partition under the same conditions.
Date posted:
September 17, 2019
-
The diagram below represents the vertical section of a fruit.
a) Suggest the possible agent of dispersal of this fruit.
b) Explain two observable features that adapt the fruit to its mode of dispersal.
Date posted:
September 17, 2019
-
A cross between a red flowered plants and white flowered plants produced plants with pink flowers. Using letter R to represent the gene for red color and W for white.
a) What were the parental genotypes?
b) Work out the cross between f1 generations.
c) State the phenotypic and genotypic ratios of the f2 generations.
Date posted:
September 17, 2019
-
In an experiment magnesium ribbon was reacted with dilute sulphuric (VI) acid and the volume of hydrogen gas produced with time noted. The graph below shows the volume of gas produced with time
Explain the following observations.
(i) The curve of the graph is steepest at the beginning.
(ii) The curve of the graph completely flattens at region AB.
(iii) On the same axis plot the curve that would be obtained if the acid used was ethanoic acid. Label it ethanoic acid
Date posted:
September 17, 2019
-
The flow diagram below represents passage of a meal through the human digestive system. Study the diagram and answer the questions that follow.
(a) Name the physical process that will occur in mouth cavity
(b) Name the digestive juices B and C
B...........................
C...........................
(c) Explain two ways in which the digestive system is protected from corrosive effects of digestive juices.
(d) Name the hormone that stimulate secretion of juice B.
(e) Identify two contents of digestive juice A
Date posted:
September 17, 2019
-
Name the source of hydrochloric acid in the mammalian stomach.
Date posted:
September 17, 2019
-
The table below gives the solubility of potassium bromide and potassium sulphate at 00C and 800C.
When an aqueous mixture containing 60g of potassium bromide and 7g of potassium sulphate in 100g of water was cooled from 800C to 00C, some crystals were formed.
(a) Identify the crystals.
(b) Determine the mass of crystals formed.
(c) Name the method used to obtain the crystals.
Date posted:
September 17, 2019
-
Expand (1 – 2x)5 hence use the expansion up to the forth term to estimate the value of (0.8)5 correct to 3 decimal places
Date posted:
September 17, 2019
-
Use logarithms tables to evaluate
Date posted:
September 17, 2019
-
Describe how solid Aluminium chloride can be separated from a solid mixture of sodium chloride and ammonium chloride.
Date posted:
September 17, 2019
-
An experiment shown below was a set up to investigate a certain physiological process in plants.
a) What process was being investigated? (1 mark)
b) What effect will the following have on the observation made in (a) above?
i) Fanning the shoot
ii) Removing all the leaves from the shoot.
iii) Placing the set up in the dark.
Date posted:
September 17, 2019
-
The diagram below shows a sketch of the line y = 16 – x2 and y = x2 – 4x intersecting at point A and B.
a)Find the coordinates of A and B.
b)Calculate the area bounded by the curve y = 16 – x2 the y-axis and the x-axis.
c)Calculate the area of the shaded region that lies below the x – axis.
d)Calculate the area of the region enclosed by the curves y = 16 – x2, y = x2 – 4x and the y – axis.
Date posted:
September 17, 2019
-
The relative atomic mass of an element is 10.28, it has two isotopes 
Calculate the relative percentage abundance of each isotope.
Date posted:
September 17, 2019
-
The atomic number of Q and R are 9 and 17 respectively. Compare the electron affinity of Q and . Explain.
Date posted:
September 17, 2019
-
The following diagram of a leaf shows what happens in a plant leaf during photosynthesis.
(a) State two ways in which leaves are adapted to absorb light.
(b) Name the gases labeled x and y.
(c) Name the tissues that transports:-
(i) Water into the leaf.
(ii) Sugar to other parts of the plant.
(d) Explain why it is an advantage for the plant to store carbohydrates as starch rather than as sugars.
Date posted:
September 16, 2019
-
The points with coordinates (5,5) and (-3, -1) are the ends of a diameter of a circle centre A. Determine;
a)The coordinates of A.
b)The equation of a circle, expressing it inform of x2 + y2 + ax + by + c = 0 where a, b and c are constants
Date posted:
September 16, 2019
-
Using trapezoidal rule of 5 strips determine the area under the curve y=3x2 – 20 between the line x=1 and x=6.
Date posted:
September 16, 2019
-
The apparatus below illustrate breathing in a mammal.
(a) Describe what happens if the rubber plug is pulled in the direction shown by the arrow.
(b) Give the parts of mammal represented by:-
(i) Capillarity tube.
(ii) Rubber plug.
Date posted:
September 16, 2019
-
Explain how dioecism prevent self-pollination
Date posted:
September 16, 2019
-
A student observed a row of 16 epidermal cells in a microscopic field that was 8mm in diameter. Calculate the average length of each cell in micrometers.
Date posted:
September 16, 2019
-
A scientific space craft brought some material to earth from the outer space. Explain how one would establish if the material is living or non-living.
Date posted:
September 16, 2019
-
The diagram below represents three types of neurons found in a mammalian body.
(a) Name the neurons X, Y and Z
(b) Name the chemical substance responsible for the transmission of an impulse across the gap labelled W.
(c) State two functions of the part labelled M.
(d) In which part of the spinal cord is neurone Y located?
(e) Using arrows indicate on the diagrams the direction followed by nerve impulse leading to a response.
Date posted:
September 16, 2019