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Explain the following system characteristics
(i) System control
(ii) Sub-systems
Date posted:
November 6, 2019
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Explain the difference between Trojan horse and Hoax viruses.
Date posted:
November 6, 2019
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Computer can fail to work due to problems associated with operating system. Explain how the following problems can be corrected.
(i) Run time problems
(ii) Corrupted registry
Date posted:
November 6, 2019
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State the meaning of the following operating systems terms:
(i) Interrupt
(ii) Trouble shooting.
(iii) Clock speed.
Date posted:
November 6, 2019
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Differentiate between a word and a word length as used in data representation.
Date posted:
November 6, 2019
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Using one's complement, perform the following binary arithmetic leaving the answer in decimal notation.
11012 - 1001012
Date posted:
November 6, 2019
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Using two's complement, show how the arithmetic below would be carried out on a 8 – bit computer system. (+54) – (+29).
Date posted:
November 6, 2019
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Study the polymer below and use it to answer the questions that follow:
(a) Give the name of the monomer and draw its structures
(b) Identify the type of polymerization that takes place
(c) State one advantage of synthetic polymers
Date posted:
November 6, 2019
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A car rental firm leases its cars for Kshs. 2500.00 per day. The manager gives a discount based on the number of days that the car is rented. If the rental period is greater than or equals to 7 days then a 25% discount is given. Write a pseudo-code to accept a car number and the rental period, and calculate the total amount earned by the company when a car is leased.
Date posted:
November 6, 2019
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Give one reason to the growth of communication industry in Kenya.
Date posted:
November 6, 2019
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Define the following terms as used in a worksheet.
i) Columns
ii) Rows
Date posted:
November 6, 2019
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The formula below represents active ingredients of two cleansing agents A and B
Which one of the cleansing agents would be suitable to be used in water containing magnesium hydrogen carbonate? Explain
Date posted:
November 6, 2019
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State the cursor action when the following keyboard keys are pressed
i. Delete key
ii. Insert key
iii. Pgup (page up) key
iv. Pgdwn (page down) key
Date posted:
November 6, 2019
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State any two laws governing protection of information.
Date posted:
November 6, 2019
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State the function of an Address register.
Date posted:
November 6, 2019
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Give three reasons why a company may prefer a tailor made software over off the shelf software.
Date posted:
November 6, 2019
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Distinguish between an integrated software and a software suite.
Date posted:
November 6, 2019
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Make T the subject of the formula
Date posted:
November 5, 2019
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Use complete square method to solve for x
8x2 + 6x – 9 = 0
Date posted:
November 5, 2019
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Find the length of DP in the figure below
Date posted:
November 5, 2019
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Solve for x
Log27 (x + 5) - log27 (x – 3) = 2/3
Date posted:
November 5, 2019
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Given that A = 5i + 4j + K and B = 8i – 5j – 5k and P divides AB externally in the ratio 5:2. Find
the:-
(a) Position vector of P
(b) The magnitude of OP
Date posted:
November 5, 2019
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Town B is 180km on a bearing 0500 from town A. Another town C is on a bearing of 1100 from town A and on a bearing of 1500 from town B. A fourth town D is 240 km on a bearing of 3200 from A. Using scale drawing, such that 1cm rep 30km,
(a) Show the relative position of the towns
(b) Using the diagram, find
(i) Distance AC
(ii) Distance CD
(iii) Compass bearing of C from D
Date posted:
November 5, 2019
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Nairobi and Eldoret are 600km apart. At 9.20a.m. a lorry leaves Eldoret for Nairobi at a speed of 60km/hr. At 10.00a.m. a car leaves Eldoret for Nairobi at a speed of 120km/hr. After 20 minutes of travel, the car develops a mechanical problem which takes 20 minutes to repair. The car then proceeds with the journey at the same speed.
(a) Calculate the time the lorry arrived in Nairobi
(b) Find the time when the car overtakes the lorry
(c) Find the distance from Nairobi at the overtaking point
(d) Calculate how far the lorry was from Eldoret when the car reached Nairobi
Date posted:
November 5, 2019
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Matrix M is given by 
(a) Find the inverse of M
(b) Two schools A and B purchased beans at Ksh. b per bag and maize at Ksh. m per bag. School A
purchased 30 bags of beans and 40 bags of maize for sh. 72,000. School B purchased 50 bags of
beans and 20 bags of maize for sh. 64,000
(i) Form a matrix equation to represent the information above
(ii) Use the inverse matrix of M to find the price of one bag of each item
(c) The price of beans later went up by 5% and that of maize remained constant. School A bought the
same quantity of beans but spent the same total amount of money as before on the two items. State
the new ratio of beans to maize.
Date posted:
November 5, 2019
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The figure below shows a square based pyramid on top of a cuboid
(a) Draw the net of the solid
(b) Calculate the total surface area of the net.
Date posted:
November 5, 2019
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The gradient function of a curve is given by 3x2 + 2x – 3. If the curve passes through the point (-4, -6), Find the equation of the curve.
Date posted:
November 5, 2019
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The diagram below represents a solid made up of a hemisphere mounted on a cone. The common radius is 6cm and the height of the solid is 15cm.
Calculate the external surface area of the solid
Date posted:
November 5, 2019
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Use Logarithms to evaluate
Date posted:
November 5, 2019
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Given that sin (3x – 50)0 – Cos (x + 20)0 = 0 and x is an acute angle; find the value of x
Date posted:
November 5, 2019