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Use logarithms, correct to 4 decimal places to evaluate.
Date posted:
October 16, 2019
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A spherical ball is 15cm in diameter. What is its surface area?
Date posted:
October 16, 2019
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Evaluate without using tables or a calculator;
Date posted:
October 16, 2019
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(i) By parametric formula with reference to a standard table using a graphical method. [4]
(ii) Outline the steps involved in graduating mortality rates with reference to a
standard table [3]
Date posted:
October 15, 2019
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One day, 1/4 of the female workers in a factory was absent. A total of 20 workers were absent that day. If 36 female workers, how many male workers were absent that day?
A 8
B 12
C 48
D 27
Date posted:
October 15, 2019
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A mason planned the foundation of a hut whose radius was 7 m. If he placed a peg at a 4 m intervals, how many pegs were used?
A 44
B 11
C 10
D 12
Date posted:
October 15, 2019
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A train left Mombasa at 1850h. It took five hours and ten minutes to reach Nairobi. At what time did it reach Nairobi
A 12 noon
B 12 midnight
C 6.00 am
D 7.00 am
Date posted:
October 15, 2019
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Paul deposited sh 50000 in a bank which offered a simple interest at a rate of 14% per annum. He withdrew all the money from the bank after three years. How much did she withdraw?
A sh 21000
B sh 29000
C sh 7000
D sh 71000
Date posted:
October 15, 2019
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John is three times as old as his daughter. In five years to come, the sum of their ages will be seventy years. What was the sum of their ages ten years ago?
A 60 years
B 50 years
C 40 years
D 80 years
Date posted:
October 15, 2019
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this question is desined for financial mathematics course
details:
(i) Calculate the price of the treasury bill and the annual simple rate of discount
from the treasury bill if both investments are to provide the same effective rate
of return. [3]
(ii) Suggest one factor, other than the rate of return, which might determine which
investment is chosen.
Date posted:
October 15, 2019
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A school of 200 pupils was to be served with milk which was in a cylindrical container of base radius 70 cm and a height of 0.2 m. How many decilitres did each child get
A 5940 decilitres
B 154 decilitres
C 594 decilitres
D 1.54 decilitres
Date posted:
October 15, 2019
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Name the type of bonding and structure found in: -
(a) Ice
(b) Magnesium chloride
Date posted:
October 15, 2019
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The atomic number of element P is 11 and that of Q is 8
a) Write down the possible formula of the compound formed between P and Q
b) Using dots (·) and crosses(x) to represent electrons draw a diagram to represent the bonding in the compound in (a) above
Date posted:
October 15, 2019
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The table below shows the elements in the third period, the oxides of the third period and their properties. The letters are not the actual symbols of the elements. Study the information and answer
the questions that follow:
i) Complete the table above
ii) Explain the trend in the atomic radius across the period
iii) Explain why the oxide of element V does not exist
Date posted:
October 15, 2019
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Study the information in the table below and answer the questions that follow:
(The letters do not represent the actual symbols of the elements)
(i) What is meant by ionization energy?
(ii) Element R has the lowest ionization energy. Explain
(iii) When a piece of element Q is placed on water it melts and a hissing sound is produced as it moves on the water surface. Explain these observations
(iv) Write the equation for the reaction between element Q and water
Date posted:
October 15, 2019
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Part of the periodic table is given below study it and answer the questions that follow.
The letters do not represent the actual elements
(i) What type of bond is formed when Y reacts with Z. Explain
(ii) Explain the difference in the atomic radii of element A and B
(iii) Explain the difference in the reactivity of Z and B
Date posted:
October 15, 2019
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The grid below represents part of the periodic table. The letters do not represent actual symbols of the elements. Study it and answer the questions that follow:-
(a) What type of bond would you expect in the compound formed between H and F. Explain
(b) (i) Which of the elements J and M will have a greater atomic radius? Explain
(ii) Elements F and N are in the same group of periodic table. How do their atomic
radius compare? Explain
(c) An element W has atomic number 15. Indicate the position it would occupy in the table above
(d) What is the name given to elements X – Z?
(e) Why is J used in electric cables where Q is not
(f) P and J are termed as metalloids. What does the term metalloid mean?
(g) How would you expect the reactivity of H and M to compare? Explain
Date posted:
October 15, 2019
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You carried out a field study on a lake near your school.
i. Give TWO factors you will consider when making a working schedule.
ii. State THREE challenges that you are likely to face during the field study.
Date posted:
October 15, 2019
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Name the FIVE features of ice deposition in glaciated lowlands.
Date posted:
October 15, 2019
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Outline conditions necessary for the formation of a cirque.
Date posted:
October 15, 2019
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Differentiate between chemical and physical weathering.
Date posted:
October 15, 2019
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Sodium metal tarnishes when exposed to the air where a white powder is formed on its
surface. A small piece of this sodium metal was dropped into 25g of ethanol and 1200cm3
of hydrogen gas was evolved at r.t.p. The unreacted ethanol was evaporated and a white
solid remained. (Na=23, molar gas volume at r.t.p = 24dm3, C=12, O =16, H=1)
(a) Write a chemical equation for the reaction between ethanol and sodium metal
(b) Determine the mass of sodium that reacted with ethanol
(c) What mass of ethanol evaporated?
(d) The ethanol was evaporated at 80oC, while the white solid remained unaffected at this
temperature. What is the difference in structure of ethanol and the white solid?
(II) (a) Name an inorganic liquid which liberates hydrogen gas with sodium metal
(b) What two differences would you observe if similar pieces of sodium were dropped
separately into small beakers containing equal amount of ethanol and the liquid
named in (II)(a) above respectively
Date posted:
October 15, 2019
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Explain the following observations:-
(i) NaCl allows electric current to pass through them in molten state
(ii) Graphite is a non-metal yet it is a conductor of electricity
Date posted:
October 15, 2019
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Explain how electrical conductivity can be used to distinguish between magnesium oxide and silicon (IV) oxide
Date posted:
October 15, 2019
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Explain why luminous flame is capable of giving out light and soot
Date posted:
October 15, 2019
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Water has a boiling point of 100oC while hydrogen chloride has a boiling point of -115oC. Explain
Date posted:
October 15, 2019
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Between aluminium and copper which one is a better conductor? Explain
Date posted:
October 15, 2019
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Using dots and crosses to represent electrons, draw the structures of the following:
(a) Phosphorous chloride (PCl3)
(b) Hydroxonium ion (H3O+)
Date posted:
October 15, 2019
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a. Eleza maana ya lakabu.
b. Huku ukitoa mifano mwafaka, taja asili tano za lakabu.
c. Eleza sifa saba za lakabu.
d. Eleza umuhimu wa lakabu katika jamii
Date posted:
October 15, 2019
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Soma Shairi kisha ujibu maswali.
(a) Kwa kuzingatia mishororo miwili ya mwisho kila ubeti, eleza bahari ya shairi hili.
(b) Onyesha kero zinazosababishwa na mvua.
(c) Eleza kanuni zilizofuatwa kutunga shairi hili.
(d) Onyesha namna mshairi alivyotumia idhini yake.
(e) Andika ubeti wa kwanza kwa lugha ya nathari.
(f) Taja mbinu mbili za lugha zilizotumiwa katika shairi hili.
(g) Andika maana za maneno haya kulingana na muktadha wa shairi.
(i) kutwa na kucha
(ii) kuicha mvua
Date posted:
October 15, 2019