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- Distinguish between Secretion and excretion.(Solved)
Distinguish between Secretion and excretion.
Date posted: October 1, 2019.
- Describe how the following reagents can be used to prepare copper (II) hydroxide, solid copper (II) sulphate, solid sodium hydroxide and distilled water(Solved)
Describe how the following reagents can be used to prepare copper (II) hydroxide, solid copper (II) sulphate, solid sodium hydroxide and distilled water.
Date posted: October 1, 2019.
- Name the blood vessel that conveys blood to the
a)Heart cells
b)Kidney
(Solved)
Name the blood vessel that conveys blood to the
a)Heart cells
b)Kidney
Date posted: October 1, 2019.
- Complete the table below for the characteristics of the sub atomic particles.(Solved)
Complete the table below for the characteristics of the sub atomic particles.
Date posted: October 1, 2019.
- Give a brief classification of ticks as shown below
Phylum
Class (Solved)
Give a brief classification of ticks as shown below
Phylum
Class
Date posted: October 1, 2019.
- Explain the disadvantages of using acarides in tick control(Solved)
Explain the disadvantages of using acarides in tick control
Date posted: October 1, 2019.
- Name two methods that would be used to measure growth in plants.(Solved)
Name two methods that would be used to measure growth in plants.
Date posted: October 1, 2019.
- A frustrum whose vertical height is 4cm is formed by cutting the top of a cone parallel to the base if the two radii of...(Solved)
A frustrum whose vertical height is 4cm is formed by cutting the top of a cone parallel to the base if the two radii of the frustrum are 6cm and 8cm respectively, determine the height of the original cone.
Date posted: October 1, 2019.
- State two precautions you would observe when preparing a bacteria culture in the laboratory.(Solved)
State two precautions you would observe when preparing a bacteria culture in the laboratory.
Date posted: October 1, 2019.
- Using a punnet square, explain why the view that “some women have a tendency to giving birth to girl or boy babies only” has...(Solved)
Using a punnet square, explain why the view that “some women have a tendency to giving birth to girl or boy babies only” has no scientific foundation.
Date posted: October 1, 2019.
- The flow chart below illustrates two industrial processes, Haber process and the Contact process:(Solved)
The flow chart below illustrates two industrial processes, Haber process and the Contact process:
(a) (i) Give the name of the process by which air is seperated into oxygen and nitrogen
(i) Apart from oxygen and nitrogen gases produced from process (a)(i) name one other gas produced
(b) Name the substances represented by the letters A, B, C and D
(c) Name the catalysts used in:
(i) Haber Process
(ii) Contact Process
(d) Explain the role of the catalysts in both the Haber and the Contact processes
(e) Write a chemical equation for the formation of compound B
(f) Calculate the percentage by mass of the nitrogen present in compound D
(g) Give one major use of compound D
Date posted: October 1, 2019.
- In maize, yellow colour is dominant over White colour. Using letter W to denote gene for maize colour, show how one would establish whether a...(Solved)
In maize, yellow colour is dominant over White colour. Using letter W to denote gene for maize colour, show how one would establish whether a given sample of yellow maize is pure or a hybrid.
Date posted: October 1, 2019.
- Study the set-up below and answer the questions that follow.(Solved)
Study the set-up below and answer the questions that follow.
a) (i) Name Gas X
(ii) State the effect of releasing gas X to the environment
b) Write down equations for the reactions taking place in;
(i) Tube I
(ii) Tube II
(iii) Flask
c) State the observation made in tube III
d) Write down an equation for the reaction which could be used to generate Carbon (IV) Oxide for the above set up
(e) Name the reagents used to generate gas X in the laboratory
(f) Complete the diagram above to show how excess gas X can be collected
Date posted: October 1, 2019.
- The grid below shows a part of the periodic table. The letters do not represent the actual symbols. Use it to answer the questions that...(Solved)
The grid below shows a part of the periodic table. The letters do not represent the actual symbols. Use it to answer the questions that follow:-
a) How do the atomic radius of element
(i) X and M compare. Explain.
(ii) U and Q. Explain
b) Which letter represent the most reactive metal. Explain.
Date posted: October 1, 2019.
- To determine the relationship between angular velocity w and tension T, a student used a smooth disc with a hole at the centre, a string...(Solved)
To determine the relationship between angular velocity w and tension T, a student used a smooth disc with a hole at the centre, a string and cylindrical object of mass m, as shown below
Describe how the student went about determining the relationship, specifying any other necessary material or instrument not shown in the diagram
Date posted: October 1, 2019.
- A bicycle wheel with radius 28cm moves with a linear velocity of 8m/s, determine
(Solved)
A bicycle wheel with radius 28cm moves with a linear velocity of 8m/s, determine
(i) the angular velocity of the wheel
(ii) the centripetal acceleration of a point on the rim of the wheel
Date posted: October 1, 2019.
- Explain the functions of complementary metal-oxide semiconductor (CMOS)(Solved)
Explain the functions of complementary metal-oxide semiconductor (CMOS)
Date posted: October 1, 2019.
- The number of protons, neutrons and electrons in atoms A to F are given in the table below the letters do not represent the actual...(Solved)
The number of protons, neutrons and electrons in atoms A to F are given in the table below the letters do not represent the actual symbol of the elements:-
Choose from the table the letters that represent:
(i) An atom of a metal
(ii) A neutral atom of a non-metal
(iii) An atom of a noble gas
(iv) A pair of isotopes
(v) A cation
(vi) Anion
Date posted: October 1, 2019.
- Briefly explain what happen during power on self test (POST)(Solved)
Briefly explain what happen during power on self test (POST)
Date posted: October 1, 2019.
- When zinc is heated to redness in a current of steam, hydrogen gas is obtained. Write an equation for the reaction(Solved)
When zinc is heated to redness in a current of steam, hydrogen gas is obtained. Write an equation for the reaction
Date posted: October 1, 2019.
- In an experiment, 100g of hot water at 90oC was mixed with 20g of ice at 0oC in a lagged plastics colorimeter.(Solved)
In an experiment, 100g of hot water at 90oC was mixed with 20g of ice at 0oC in a lagged plastics colorimeter. After stirring, all the ice melted and the temperature of the mixture was found to be 61.5oC. Determine the latent heat of fusion of ice
(Specific heat capacity of water =4200Jkg-1k-1)
Date posted: October 1, 2019.
- Hydrogen burns in oxygen to form an oxide.
(i) Write an equation for the reaction
(ii) State two precautions that must be taken before the combustion begins...(Solved)
Hydrogen burns in oxygen to form an oxide.
(i) Write an equation for the reaction
(ii) State two precautions that must be taken before the combustion begins and at the end of
the combustion.
Date posted: October 1, 2019.
- Hydrogen can be prepared by reacting zinc with dilute hydrochloric acid.
a) Write an equation for the reaction.
b) Name an appropriate drying agent for hydrogen gas.
c)...(Solved)
Hydrogen can be prepared by reacting zinc with dilute hydrochloric acid.
a) Write an equation for the reaction.
b) Name an appropriate drying agent for hydrogen gas.
c) Explain why copper metal cannot be used to prepare hydrogen gas.
Date posted: October 1, 2019.
- A student set-up the apparatus as shown below to determine the power of an electric heater(Solved)
A student set-up the apparatus as shown below to determine the power of an electric heater
(i) Other than time, state the measurements that would be used to determine the quantity of heat P absorbed by ice in a unit time
(ii) Complete the circuit to show the connection of the essential circuit components
(iii) Describe how the student would proceed to determine P
(iv) Give a reason why P may not be equal to the value indicated by the manufacturer
Date posted: October 1, 2019.
- Explain how submerged hydrophytes obtain their oxygen for respiration at night (Solved)
Explain how submerged hydrophytes obtain their oxygen for respiration at night
Date posted: October 1, 2019.
- Name the process which occurs in mammalian liver that lead to formation of urea (Solved)
Name the process which occurs in mammalian liver that lead to formation of urea
Date posted: October 1, 2019.
- State the functional differences between pulmonary artery and pulmonary vein.(Solved)
State the functional differences between pulmonary artery and pulmonary vein.
Date posted: October 1, 2019.
- The readings tabulated below shows how the length of a helical spring varied with the load hanging on it(Solved)
The readings tabulated below shows how the length of a helical spring varied with the load hanging on it
(i) Complete the table to show the values of extension
(ii) Draw a graph of extension (y-axis) against load for the spring
(iii) Determining form the graph the proportionality constant of the spring
Date posted: October 1, 2019.
- Explain how a genetic trait is inherited in a mammal.(Solved)
Explain how a genetic trait is inherited in a mammal.
Date posted: October 1, 2019.
- Explain why a breastfeeding woman generally require more protein in her daily diet than a normal woman.(Solved)
Explain why a breastfeeding woman generally require more protein in her daily diet than a normal woman.
Date posted: October 1, 2019.