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- Study the diagram below (Solved)
Study the diagram below
Why would it not be advisable to use potassium in place of iron in the set-up?
Date posted: September 9, 2019.
- The following set-up was used by a student to determine the relative density of a cork(Solved)
The following set-up was used by a student to determine the relative density of a cork
During the experiment, the following measurements were taken:-
- Weight of sinker in water = w1
- Weight of sinker in water and cork in air = w2
- Weight of sinker and cork in water = w3
(i) Write an expression for the up thrust on cork
(ii) Write an expression for the relative density of the cork
Date posted: September 9, 2019.
- The diagram below shows a wooden log 12m long, density 800kg/m3 and cross-sectional area 0.06m< sup>2floating upright in sea water of density 1.03g/cm3, such that...(Solved)
The diagram below shows a wooden log 12m long, density 800kg/m3 and cross-sectional area 0.06m< sup>2floating upright in sea water of density 1.03g/cm3, such that a third of it is covered by water.
(i) Determine the weight of the block
(ii) The up-thrust on the block
(iii) The minimum weight that can be placed on the block to just make it fully submerged
Date posted: September 9, 2019.
- Two spring Q and R have proportionality constants 20Nm-1 and 25Nm-1 respectively. Q weighs 0.2 N while the weight of R is negligible. The two...(Solved)
Two spring Q and R have proportionality constants 20Nm-1 and 25Nm-1 respectively. Q weighs 0.2 N while the weight of R is negligible. The two springs are arranged to support a load of 3.0N as shown in the diagram that follows.
Determine the extension in
i) Q
ii) R
Date posted: September 9, 2019.
- The graph shows how extension e of a helical spring varied with load, hanging on it. (cm).Determine from the graph, the proportionality constant of the...(Solved)
The graph shows how extension e of a helical spring varied with load, hanging on it. (cm).Determine from the graph, the proportionality constant of the spring.
![pic992019941.png](/questions/uploads/pic992019941.png)
Date posted: September 9, 2019.
- 6.95g of hydrated iron (II) sulphate FeSO4. nH2O was dissolved in 250 cm3 solution resulting into a 0.1M solution.
Determine the value of n. (Fe =...(Solved)
6.95g of hydrated iron (II) sulphate FeSO4. nH2O was dissolved in 250 cm3 solution resulting into a 0.1M solution.
Determine the value of n. (Fe = 56, O = 16, S = 32, H = 1).
Date posted: September 9, 2019.
- A body of mass 4.0 kg held at a vertical height of 500cm is released to travel along a frictionless curved path as shown in...(Solved)
A body of mass 4.0 kg held at a vertical height of 500cm is released to travel along a frictionless curved path as shown in the figure below.The 4.0kg mass strikes body of mass 6.0kg at rest immediately it reaches the horizontal. The bodies stick together and move in the same direction. Determine the velocity of the bodies immediately after collision.
![pic992019928.png](/questions/uploads/pic992019928.png)
Date posted: September 9, 2019.
- The figure below shows a simple pendulum of length 80 cm. the pendulum bob whose mass is 50 g oscillates between points A and B,...(Solved)
The figure below shows a simple pendulum of length 80 cm. the pendulum bob whose mass is 50 g oscillates between points A and B, through its rest position C. A and B are both 10 cm higher than C.
(a) State the form of energy possessed by the pendulum bob at point A
(b) Determine
(i) The velocity of the bob at point C
(ii) The tension in the string as the bob passes point C
(Take acceleration due to gravity g=10m/s2
Date posted: September 9, 2019.
- The figure below shows an inclined plane and a load of mass 15kg pulled by an effort of 100N.Find the efficiency of the machine.(Solved)
The figure below shows an inclined plane and a load of mass 15kg pulled by an effort of 100N.Find the efficiency of the machine.
![pic992019911.png](/questions/uploads/pic992019911.png)
Date posted: September 9, 2019.
- A, B, C are three homologous series of organic compounds.(Solved)
A, B, C are three homologous series of organic compounds.
(i) What is the name given to series C?
(ii) Write down the name and structural formula of the second member of series “B”.
(iii) Draw the structural formulae of the first two members of the series "A".
(iv) Complete the balance in the following equation:
CH3CH3 + O2 →
Date posted: September 9, 2019.
- The figure below show a uniform metre rule balanced when pivoted at the 30cm mark under the conditions of forces as shown below.Calculate the weight...(Solved)
The figure below show a uniform metre rule balanced when pivoted at the 30cm mark under the conditions of forces as shown below.
Calculate the weight W of the rule.
Date posted: September 9, 2019.
- The figure below shows water flowing through two sections A and B of a pipe having different cross-sectional area.Indicate and explain the water level in...(Solved)
The figure below shows water flowing through two sections A and B of a pipe having different cross-sectional area.Indicate and explain the water level in manometer B.
![pic992019857.png](/questions/uploads/pic992019857.png)
Date posted: September 9, 2019.
- The figure below shows a U-tube manometer containing a gas, mercury and water. Calculate the gas pressure acting on the mercury. (Take atmospheric pressure to...(Solved)
The figure below shows a U-tube manometer containing a gas, mercury and water. Calculate the gas pressure acting on the mercury. (Take atmospheric pressure to be 1.05 x 105 pa, density of mercury and water to be 13600kg/m3 and 1000kg/m3 respectively).
![pic992019852.png](/questions/uploads/pic992019852.png)
Date posted: September 9, 2019.
- Starting with lead oxide, describe how a pure sample of lead carbonate can be prepared in the laboratory.(Solved)
Starting with lead oxide, describe how a pure sample of lead carbonate can be prepared in the laboratory.
Date posted: September 9, 2019.
- Describe the chemical test that can be used to distinguish sodium sulphate from sodium sulphite.(Solved)
Describe the chemical test that can be used to distinguish sodium sulphate from sodium sulphite.
Date posted: September 9, 2019.
- The figure below shows three wooden blocks resting on a flat surface. (They are of the same material).(Solved)
The figure below shows three wooden blocks resting on a flat surface. (They are of the same material).
i) Arrange them starting from the least stable.
(ii) State the factor that you have considered in (i) above.
Date posted: September 9, 2019.
- To determine the heat of combustion of ethanol, a form four class used the set-up shown below.(Solved)
To determine the heat of combustion of ethanol, a form four class used the set-up shown below.
(i) Fill in the missing information in the class table.
(ii) The 50ml of water used is de-ionised and its specific heat capacity c, is 4.2kJ/Kg/K. Calculate heat of combustion of the ethanol used.
(iii) Calculate the moles of ethanol that were burnt (RMM of ethanol = 46).
(iv) Calculate the heat of combustion per mole of ethanol.
Date posted: September 9, 2019.
- The figure below shows an electromagnetic relay being used to switch an electric motor on and off. The electromagnet consists of a coil of wire...(Solved)
The figure below shows an electromagnetic relay being used to switch an electric motor on and off. The electromagnet consists of a coil of wire wrapped around a core. The motor in figure is switched off.
(a) Suggest suitable material for the core.
(b) What happens to the core when switch S is closed?
(c) Why do the contacts A and B close when the switch S is closed.
(d) When the switch S is opened, what will happen to;
(i) The core
(ii) Soft iron armature.
Date posted: September 9, 2019.
- The grid below is a Periodic Table. The letters used are not the actual chemical symbols of the elements. Study the table and answer the...(Solved)
The grid below is a Periodic Table. The letters used are not the actual chemical symbols of the elements. Study the table and answer the questions that follow.
(a) What name is given to the elements that occupy region X?
(b) Write an equation to show how element Y forms an ion.
(c) Compare the atomic and ionic radius of T.
(d) Explain why the ionization energy of V is lower than that of D.
(e) Name the chemical family to which E belongs.
(f) An element A is in period 3 and it loses three electrons to form an ion. Write the electronic configuration of an atom of A.
(g) Elements D and U combine to form a compound with a giant structure.
(i) Name the giant structure.
(ii) State two characteristics of the structure.
(h) Write the formula of the compound formed when T and Y react.
(i) State and explain the change in electrical conductivity from D to T.
Date posted: September 9, 2019.
- The figure below shows a circuit with resistors and voltmeter connected to a battery.(Solved)
The figure below shows a circuit with resistors and voltmeter connected to a battery.
(i) If each cell has an internal resistance of 0.7 ohms, determine the total resistance in the circuit.
(ii) What amount of current flows through the 3 ohms resistor when the switch is closed?
(iii) What is the reading of the voltmeter when the switch S is
(I) Open
(II) Closed
(iv) Account for the difference between the answers in (I) and (II) above.
Date posted: September 9, 2019.
- Give two meanings from each of the sentences below.(Solved)
Give two meanings from each of the sentences below.
i. "Did you see the girls with a telescope?"
ii)John rode a bicycle by the bank.
Date posted: September 7, 2019.
- Explain the ambiguity in each these sentences.(Solved)
Explain the ambiguity in each these sentences.
i)We saw her duck
ii)The lioness took the cub away using its tail.
Date posted: September 7, 2019.
- Explain the difference in meaning among the three sentences below.(Solved)
Explain the difference in meaning among the three sentences below.
i. Mwangi went in with his cap on.
ii. Mwangi just went in with his cap on.
iii. Just Mwangi went in with his cap on.
Date posted: September 7, 2019.
- Identify and correct the misspelt words in the following paragraph.(Solved)
Identify and correct the misspelt words in the following paragraph.
Occassionally, you will be called upon to speak in public. You must learn to do so without embarassing yourself by fumbling and making unnecessary repeatations. With adequate practice you can become an accomplished public speaker.
Date posted: September 7, 2019.
- Each of the following sentences is repetitive. Rewrite the sentences removing the repetitions.
(Solved)
Each of the following sentences is repetitive. Rewrite the sentences removing the repetitions.
(i) Kaka cannot be able to complete this exercise.
(ii) Please repeat again what you have said.
(iii) He hit a tree as he reversed back the car.
(iv) How many people ascended up the mountain?
(v) Women can run more faster than Johnston.
Date posted: September 7, 2019.
- Rewrite the following sentences correcting the error without changing the meaning. (Solved)
Rewrite the following sentences correcting the error without changing the meaning.
1.Jairo is more better educated than Saisi.
2. He has the tendency of visiting people late hours.
3. When she came in, it was all calm but all over a sudden the house became noisy.
4. We returned back to school before 7.00 P.M.
5. I wish I was as well prepared for K.C.S.E as you.
6.The news are in television.
7.He got married with a Nigerian last year.
8.The student knocked on the door continuously as the others watched.
9. The child inflated the balloon too much that it burst.
10. I have a problem to memorizing people’s names.
Date posted: September 7, 2019.
- Rewrite the following sentences correcting the error without changing the meaning. (Solved)
Rewrite the following sentences correcting the error without changing the meaning.
a) The dog has broken it’s leg.
b) Jane is the smaller of the five sisters.
c) Everyone except the two boys and I was disqualified.
d) The teacher gave us a humble time.
e) She does not reply to peoples letters.
f) The students pushed their bus when it stuck in the mud.
g) Please don’t dirtify the class.
h) He hanged his trousers under the sun.
i) I’m not understanding what you are talking about.
j) There are situations of which you need to act with speed or else the consequences
will catch up with you.
k) Our guidance and counselling teacher give as sound advice.
l) Musau used his fullscap upside down.
m) It is too bad for one to loose his or her pen during exams.
n) He is looking for an employment in Nairobi.
o) This exercise comprises of rigorous training in the morning.
p) Sometimes last year, we agreed to improve our relationship with our neighbors.
q) If I was a surgeon, I would have treated the patient.
r) The hungry children entered into the dining room.
s) I cannot be able to operate this machine.
t) She likes football as it is more superior than hockey.
u) He is looking for an employment in Nairobi.
v) If today was Sunday, I would have gone to church.
Date posted: September 7, 2019.
- Distinguish between gerunds and participles in the following sentences. (Solved)
Distinguish between gerunds and participles in the following sentences.
i)They kept me waiting for hours.
ii)Hunting game is banned in this country.
Date posted: September 7, 2019.
- Rewrite the following sentences turning the underlined words into participle phrases.(Solved)
Rewrite the following sentences turning the underlined words into participle phrases.
i. As he had witnessed the crime, he was summoned to give evidence in 120 court.
ii)Now that I have listened to your story, I am more inclined to agree with you
Date posted: September 7, 2019.
- Put the verbs in brackets in the gerund or the to-infinitive.(Solved)
Put the verbs in brackets in the gerund or the to-infinitive.
i. I can’t imagine Peter ....................(go) by bike.
ii. He agreed ...................(buy) a new car.
iii. I look forward to ................ (see) you at the weekend.
Date posted: September 7, 2019.