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- A form IV maths teacher originally worked out the mean mark of her 30 students to be 41. After the correction of the test, she...(Solved)
A form IV maths teacher originally worked out the mean mark of her 30 students to be 41. After the correction of the test, she added some marks of the test, she added some marks to Njoki,Chelimo and Nafula in the ratio 2:3:4,if the new mean mark for the class is 42.5 determine how many more marks Nafula was added than Chelimo.
Date posted: August 14, 2019.
- Study the equation below and answer the question that follows.(Solved)
Study the equation below and answer the question that follows.
Identify the acid in the forward reaction. Give a reason for your answer.
Date posted: August 14, 2019.
- Solve for x in the equation below.
9(x-1) X 3(2x+1) = 243(Solved)
Solve for x in the equation below.
9(x-1) X 3(2x+1) = 243
Date posted: August 14, 2019.
- Form the quadratic equation whose roots are x= -5/3 and x=1(Solved)
Form the quadratic equation whose roots are x= -5/3 and x=1
Date posted: August 14, 2019.
- A 10 cm3 volume concentrated hydrochloric acid of density 1.18 g/cm3 and purity of 36 percent dissolved in 250 cm3 of distilled water. Calculate the...(Solved)
A 10 cm3 volume concentrated hydrochloric acid of density 1.18 g/cm3 and purity of 36 percent dissolved in 250 cm3 of distilled water. Calculate the morality of the solution. (H = 1, Cl = 35.5)
Date posted: August 14, 2019.
- Nyongesa spends a total of sh.970 on buying 3 text books and 5 pens. If he had bought 2 text books and 5 pens he...(Solved)
Nyongesa spends a total of sh.970 on buying 3 text books and 5 pens. If he had bought 2 text books and 5 pens he would have saved sh.90. Find the cost of one text book.
Date posted: August 14, 2019.
- An open right circular cone has radius of 5cm and a perpendicular height of 12cm .Calculate the surface area of the cone.(Take pi to be 3.14)(Solved)
An open right circular cone has radius of 5cm and a perpendicular height of 12cm .Calculate the surface area of the cone.(Take pi to be 3.14)
Date posted: August 14, 2019.
- Evaluate without using mathematical tables(Solved)
Evaluate without using mathematical tables
![pic14820191416.png](/questions/uploads/pic14820191416.png)
Date posted: August 14, 2019.
- Archeologists can determine the age of organic matter by measuring the proportion of carbon-14 present in a sample. Assuming that carbon-14 has a half- life...(Solved)
Archeologists can determine the age of organic matter by measuring the proportion of carbon-14 present in a sample. Assuming that carbon-14 has a half- life of 5600 years, calculate the age of a piece of wood found to contain
as much carbon-14 as in a living material.
Date posted: August 14, 2019.
- A surveyor recorded the measurements of a field in a field book using lines AB 260m as shown below.(Solved)
A surveyor recorded the measurements of a field in a field book using lines AB 260m as shown below.
a) Sketch the map of the field.
b) Find the area of the field in hectares.
Date posted: August 14, 2019.
- In the figure below E is the mid point of BC. AD: DC 3:2 and F is the meeting point of BD and AE.If AB...(Solved)
In the figure below E is the mid point of BC. AD: DC 3:2 and F is the meeting point of BD and AE.
If AB = b and AC = c
i) BD
ii) AE
b) If BF = t BD and AF = n AE. Find the value of t and n.
c) State the ratio of BD to BF.
Date posted: August 14, 2019.
- Explain the observation made in the experiment whose set up is shown below.(Solved)
Explain the observation made in the experiment whose set up is shown below.
![Q21482019151.png](/questions/uploads/Q21482019151.png)
Date posted: August 14, 2019.
- A group of people planned to contribute equally towards a water project which needed kshs. 2,000,000 to complete. However, 40 members of the group withdrew...(Solved)
A group of people planned to contribute equally towards a water project which needed kshs. 2,000,000 to complete. However, 40 members of the group withdrew from the project. As a result, each of the remaining members were to contribute ksh 2500 more.
(a) Find the original number of members in the group.
(b) Forty five percent of the value of the project was funded by Constituency Development Fund (CDF). Calculate the amount that would be made by each of the remaining members of the group.
(c) Members contribution were in terms of labour provided and money contributed. The ratio of the value of labour to the money contributed was 6:19, calculate the total amount of money contributed by the members.
Date posted: August 14, 2019.
- B is 102km on the bearing of 112° from A. C is 94km on the bearing of 062° from B D is 073°from A and...(Solved)
B is 102km on the bearing of 112° from A. C is 94km on the bearing of 062° from B D is 073° from A and 336° from C.
(a) Using a scale of 1cm to represent 20km,draw a diagram to show the positions of A,B,C and D.
(b) Using your diagram, determine;
i) The bearing of B from D and A from C.
ii) The distance AC and BD
Date posted: August 14, 2019.
- The vertices of a triangle are A(2,5), B(4,3) and C(2,3). H represents a half turn rotation about the point (0,2).
a) Draw triangles ABC and A',B',C'...(Solved)
The vertices of a triangle are A(2,5), B(4,3) and C(2,3). H represents a half turn rotation about the point (0,2).
a) Draw triangles ABC and A',B',C' under H
b)T represents a reflection in the line x = 0 and K represents a translation
.Find the coordinates of A” , B”,C” of A’, B’,C’ under TK. Hence draw triangle A”B”,C”.
c) Find the area of triangle A”,B”,C’
Date posted: August 14, 2019.
- An aircraft flying at 800 knots leaves airport A(600N,120E) at 9am local time for airport B (600N,880W) along the parallel of latitude. Find the local...(Solved)
An aircraft flying at 800 knots leaves airport A(600N,120E) at 9am local time for airport B (600N,880W) along the parallel of latitude. Find the local time at B when the plane lands.
Date posted: August 14, 2019.
- Solve for m in;
Log5 – 2 + (2m+10) = log (m-4)(Solved)
Solve for m in;
Log5 – 2 + (2m+10) = log (m-4)
Date posted: August 14, 2019.
- Two similar containers have base areas 25cm2 and 324cm2 respectively. Calculate the Capacity of the larger container correct to one decimal place if the capacity...(Solved)
Two similar containers have base areas 25cm2 and 324cm2 respectively. Calculate the Capacity of the larger container correct to one decimal place if the capacity of the smaller one is 8cm3
Date posted: August 14, 2019.
- In the figure below ED and EA are tangents to the circle at D and A. DC is parallel to AB and0. Calculate the...(Solved)
In the figure below ED and EA are tangents to the circle at D and A. DC is parallel to AB and 0. Calculate the value of x.
![pic14820191306.png](/questions/uploads/pic14820191306.png)
Date posted: August 14, 2019.
- Element G and T have atomic number 20 and 9, respectively.(Solved)
Element G and T have atomic number 20 and 9, respectively.
(a) Write down the electron arrangement of the ion of G.
(b) Which element has the same electron arrangement as the ion of T?
(c) Write the formula of compound formed by reaction of G and T.
Date posted: August 14, 2019.
- Over what range of input voltage will the Zener circuit shown in Fig. 3.68 maintain 30 V across 2000 O load, assuming that series resistance...(Solved)
Over what range of input voltage will the Zener circuit shown in Fig. 3.68 maintain 30 V across 2000 Ω load, assuming that series resistance R = 200 Ω and Zener current rating is 25 mA ?
![cct814820191236.png](/questions/uploads/cct814820191236.png)
Date posted: August 14, 2019.
- What value of series resistance is required when three 10-watt, 10-volt, 1000 mA Zener diodes are connected in series to obtain a 30-volt regulated output...(Solved)
What value of series resistance is required when three 10-watt, 10-volt, 1000 mA Zener diodes are connected in series to obtain a 30-volt regulated output from a 45 volt d.c. power source ?
Date posted: August 14, 2019.
- The circuit of Fig. 3.66 uses two Zener diodes, each rated at 15 V, 200 mA.(Solved)
The circuit of Fig. 3.66 uses two Zener diodes, each rated at 15 V, 200 mA. If the circuit is connected to a 45-volt unregulated supply, determine:
(i) The regulated output voltage
(ii) The value of series resistance R
Date posted: August 14, 2019.
- Two trains T1 and T2, traveling in opposite directions on parallel tracks are just beginning passone another. Train T1 is 72metres long and is traveling...(Solved)
Two trains T1 and T2, traveling in opposite directions on parallel tracks are just beginning pass one another. Train T1 is 72metres long and is traveling at 108km/hr.T2 is 78 metres Long and traveling at 72km/hr. Find the time in seconds the two take to completely pass one another.
Date posted: August 14, 2019.
- Without using a calculate or mathematical table, evaluate.(Solved)
Without using a calculate or mathematical table, evaluate.
![pic14820191254.png](/questions/uploads/pic14820191254.png)
Date posted: August 14, 2019.
- A 10-V Zener diode is used to regulate the voltage across a variable load resistor [See fig. 3.65].(Solved)
A 10-V Zener diode is used to regulate the voltage across a variable load resistor [See fig. 3.65]. The input voltage varies between 13 V and 16 V and the load current varies between 10 mA and 85 mA. The minimum Zener current is 15 mA. Calculate the value of series resistance R.
![cct514820191236.png](/questions/uploads/cct514820191236.png)
Date posted: August 14, 2019.
- Pipe A empties a full tank in 8 hours, pipe B empties in 6 hours and pipe C empties in 3 hours. If all the three...(Solved)
Pipe A empties a full tank in 8 hours, pipe B empties in 6 hours and pipe C empties in 3 hours. If all the three pipes are open for 30 minutes and then pipe A closed , How long will it take to empty a full tank.
Date posted: August 14, 2019.
- Find the integral values of x for which:
-6 < 3x + 3
14 – 3x >2(Solved)
Find the integral values of x for which:
-6 < 3x + 3
14 – 3x >2
Date posted: August 14, 2019.
- The Zener diode shown in Fig. 3.64 has VZ = 18 V.(Solved)
The Zener diode shown in Fig. 3.64 has VZ = 18 V. The voltage across the load stays at 18 V as long as IZ is maintained between 200 mA and 2 A. Find the value of series resistance R so that E0 remains 18 V while input voltage Ei is free to vary between 22 V to 28V.
![cct414820191236.png](/questions/uploads/cct414820191236.png)
Date posted: August 14, 2019.
- Give four reasons which can lead to having some left over foods from a family dinner.(Solved)
Give four reasons which can lead to having some left over foods from a family dinner.
Date posted: August 14, 2019.