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1) Which of the following is the definition of electrochemistry? a) The study of chemical reactions involving electricity b) The study of the movement of electrons c) The study of electrical charges d) The study of electrical conductors 2) What is an electrochemical cell? a) A device that converts electrical energy into chemical energy b) A device that converts chemical energy into electrical energy c) A device that stores electrical energy d) A device that generates heat through chemical reactions 3) What is an oxidation-reduction (redox) reaction? a) A reaction involving the transfer of protons b) A reaction involving the transfer of electrons c) A reaction involving the transfer of neutrons d) A reaction involving the transfer of positrons 4) Which species is reduced in a redox reaction? a) The species that gains electrons b) The species that loses electrons c) The species that gains protons d) The species that loses protons 5) What is the standard electrode potential? a) The potential difference between two half-cells under standard conditions b) The potential difference between two full cells under standard conditions c) The potential difference between a half-cell and a full cell under standard conditions d) The potential difference between two electrodes in any conditions 6) Which of the following is a standard hydrogen electrode? a) A platinum electrode in contact with a solution of hydrogen ions at 1 M concentration b) A platinum electrode in contact with a solution of hydrogen gas at 1 atm pressure c) A platinum electrode in contact with a solution of hydrogen gas at 1 M concentration d) A platinum electrode in contact with a solution of hydrogen ions at 1 atm pressure 7) What is the oxidation state of an atom in its elemental form? a) 0 b) 1 c) +1 d) -1 8) In a galvanic cell, where does oxidation occur? a) At the anode b) At the cathode c) In the salt bridge d) At both the anode and the cathode 9) Which of the following is an example of a primary battery? a) Alkaline battery b) Lithium-ion battery c) Lead-acid battery d) Carbon-zinc battery 10) What is the purpose of a salt bridge in an electrochemical cell? a) To allow the flow of electrons b) To prevent the mixing of reactants c) To maintain charge balance d) To regulate the temperature 11) Which of the following is the unit of electric charge? a) Ampere b) Volt c) Coulomb d) Ohm 12) What is Faraday's constant? a) The charge of one electron b) The number of electrons in one mole of substance c) The charge of one mole of electrons d) The number of moles in one gram of substance 13) What is the unit of electric potential? a) Ohm b) Joule c) Volt d) Ampere 14) Which of the following is the equation for calculating cell potential? a) Ecell = Ered - Eox b) Ecell = Ered + Eox c) Ecell = Eox - Ered d) Ecell = Eox + Ered 15) Which of the following is an example of a non-spontaneous electrochemical reaction? a) Electroplating b) Corrosion of iron c) Electrolysis of water d) Generation of electricity in a battery 16) What happens to the cell potential if the concentration of a reactant in a half-cell increases? a) The cell potential increases b) The cell potential decreases c) The cell potential remains unchanged d) The cell potential cannot be determined 17) Which of the following is an example of an electrolyte? a) Water b) Oxygen gas c) Sodium chloride solution d) Copper wire 18) What is the purpose of an inert electrode in an electrochemical cell? a) To facilitate the reaction at the electrode b) To prevent unwanted side reactions c) To supply excess electrons d) To maintain the pH of the solution 19) What is the product of the oxidation of water during electrolysis? a) Oxygen gas b) Hydrogen gas c) Sodium chloride d) Potassium hydroxide 20) What is the purpose of a voltmeter in an electrochemical cell? a) To measure the electric current b) To measure the electric potential difference c) To measure the charge transfer d) To measure the resistance

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Questions on chemistry grade 11 unit 2 1. Who proposed the concept of the atom as an indivisible particle? a) John Dalton b) J.J. Thomson c) Ernest Rutherford d) Niels Bohr 2. Which experiment led to the discovery of the electron? a) Millikan's oil drop experiment b) Rutherford's gold foil experiment c) Thomson's cathode ray tube experiment d) Bohr's hydrogen spectrum experiment. 3. Which subatomic particle is responsible for the majority of the mass of an atom? a) proton b) electron c) neutron d) nucleus 4. What is the charge and relative mass of a neutron? a) charge: +1, mass: 1 amu b) charge: -1, mass: 1 amu c) charge: 0, mass: 1 amu d) charge: 0, mass: 0 amu 5. Which of the following electromagnetic radiations has the highest energy? a) radio waves b) microwaves c) visible light d) gamma rays 6. What does the principal quantum number (n) represent in the quantum mechanical model of the atom? a) shape of the orbital b) orientation of the orbital c) distance from the nucleus d) spin of the electron 7. What is the maximum number of electrons that can occupy the 2p subshell? a) 2 b) 4 c) 6 d) 8 8. Which of the following elements has the electron configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶? a) carbon b) silicon c) argon d) calcium 9. Which principle states that no two electrons in an atom can have the same set of four quantum numbers? a) Aufbau principle b) Pauli exclusion principle c) Hund's rule d) Heisenberg uncertainty principle 10. Which of the following elements has the highest electronegativity value? a) lithium b) carbon c) oxygen d) fluorine 11. Which of the following elements is an alkaline earth metal? a) sodium b) magnesium c) chlorine d) nitrogen 12. Which of the following elements is a halogen? a) helium b) neon c) fluorine d) argon 13. Which of the following elements has the largest atomic radius? a) lithium b) carbon c) nitrogen d) fluorine 14. Which of the following elements has the highest ionization energy? a) sodium b) magnesium c) chlorine d) potassium 15. Which of the following elements is a transition metal? a) copper b) helium c) nitrogen d) argon 16. Which of the following elements is a noble gas? a) lithium b) carbon c) neon d) fluorine 17. Which of the following elements is a metalloid? a) sodium b) carbon c) oxygen d) fluorine 18. Which of the following elements has the highest melting point? a) sodium b) magnesium c) chlorine d) tungsten 19. Which of the following elements is a lanthanide? a) iodine b) uranium c) neodymium d) zinc 20. Which of the following elements is a synthetic element? a) hydrogen b) carbon c) plutonium d) oxygen 21. Which of the following quantum numbers describes the shape of an atomic orbital? a) principal quantum number (n) b) azimuthal quantum number (l) c) magnetic quantum number (ml) d) spin quantum number (ms) 22. What is the maximum number of orbitals in the p subshell? a) 1 b) 2 c) 3 d) 4 23. How many electrons can occupy the 3d subshell? a) 2 b) 6 c) 10 d) 14 24. Which of the following quantum numbers describes the orientation of an atomic orbital? a) principal quantum number (n) b) azimuthal quantum number (l) c) magnetic quantum number (ml) d) spin quantum number (ms) 25. What is the maximum number of electrons that can occupy the 4th energy level? a) 8 b) 18 c) 32 d) 50

Aliyi Amade: 📃Matrix and Determinant Questions (EUEE Standard) 1. If A is a 2x3 matrix and B is a 3x4 matrix, what is the possible dimension of the product AB?    - A) 2x2    - B) 2x3    - C) 3x2    - D) 2x4 2. The determinant of the following matrix:      | 3  1 |   | 2  4 |       - A) 10    - B) 11    - C) 12    - D) 14 3. If A and B are square matrices of the same order, what is the result of det(A^T * B)?    - A) det(A) * det(B)    - B) det(A^T) * det(B)    - C) det(A * B)t    - D) det(B * A) 4. What is the rank of the matrix:           | 1  0  2 |    | 0  1  3 |    | 0  0  0 |       - A) 2    - B) 3    - C) 1    - D) 0 5. If A is an orthogonal matrix, what can be said about its eigenvalues?    - A) Always real    - B) Always complex    - C) Always negative    - D) Always positive 6. The product of a scalar and a matrix is obtained by multiplying each element of the matrix by the scalar. What is this operation called?    - A) Addition    - B) Scalar multiplication    - C) Determination    - D) Transposition 7. If A and B are invertible matrices, what is the inverse of their product (AB)^(-1)?    - A) A^(-1) * B^(-1)    - B) AB    - C) B^(-1) * A^(-1)    - D) A^(-1) + B^(-1) 8. The determinant of the following matrix:           | 2  0  1 |    | 3  1  4 |    | 1 -1  3 |       - A) -6    - B) -7    - C) 6    - D) 7 9. What is the eigenvalue of the identity matrix?    - A) 1    - B) 0    - C) -1    - D) It doesn't have eigenvalues 10. If A is a 3x3 matrix and det(A) = 0, what can be said about A?     - A) A is invertible     - B) A is singular     - C) A is symmetric     - D) A is orthogonal 11. The product of a matrix and its transpose is always:     - A) Symmetric     - B) Diagonal     - C) Identity     - D) Skew-symmetric 12. If A and B are square matrices such that det(A) = 3 and det(B) = 2, what is det(A^(-1) * B)?     - A) 3     - B) 2     - C) 6     - D) 1/6 13. What is the adjugate of the identity matrix?     - A) Identity matrix     - B) Zero matrix     - C) Diagonal matrix     - D) Skew-symmetric matrix 14. If A is a 2x2 matrix with det(A) = 0, what can be said about A?     - A) A is invertible     - B) A is singular     - C) A is symmetric     - D) A is orthogonal 15. The determinant of a diagonal matrix is equal to:     - A) The product of its diagonal elements     - B) The sum of its diagonal elements     - C) The square of its diagonal elements     - D) 1 16. What is the rank of the following matrix?              | 1  2  3 |     | 0  0  0 |     | 4  5  6 |         - A) 1     - B) 2     - C) 3     - D) 0 17. If A is a skew-symmetric matrix, what can be said about its diagonal elements?     - A) They are always zero     - B) They are always positive     - C) They are always negative     - D) They can be any real number 18. The product of two orthogonal matrices is always:     - A) Symmetric     - B) Orthogonal     - C) Singular     - D) Skew-symmetric 19. If A and B are square matrices, what is the determinant of their sum, det(A + B)?     - A) det(A) + det(B)     - B) det(A + B)     - C) det(A) * det(B)     - D) det(A - B) 20. If A is a square matrix, what is the determinant of its inverse, det(A^(-1))?     - A) 1     - B) -1     - C) det(A)     - D) 0 answers will listed below Answer for maths questions on matrix and determinants 1. D 2. A 3. C 4. C 5. A 6. B 7. A 8. D 9. A 10. B 11. A 12. C 13. A 14. B 15. A 16. D 17. A 18. B 19. B 20. A

Aliyi Amade: 📃Matrix and Determinant Questions (EUEE Standard) 1. If A is a 2x3 matrix and B is a 3x4 matrix, what is the possible dimension of the product AB?    - A) 2x2    - B) 2x3    - C) 3x2    - D) 2x4 2. The determinant of the following matrix:      | 3  1 |   | 2  4 |       - A) 10    - B) 11    - C) 12    - D) 14 3. If A and B are square matrices of the same order, what is the result of det(A^T * B)?    - A) det(A) * det(B)    - B) det(A^T) * det(B)    - C) det(A * B)t    - D) det(B * A) 4. What is the rank of the matrix:           | 1  0  2 |    | 0  1  3 |    | 0  0  0 |       - A) 2    - B) 3    - C) 1    - D) 0 5. If A is an orthogonal matrix, what can be said about its eigenvalues?    - A) Always real    - B) Always complex    - C) Always negative    - D) Always positive 6. The product of a scalar and a matrix is obtained by multiplying each element of the matrix by the scalar. What is this operation called?    - A) Addition    - B) Scalar multiplication    - C) Determination    - D) Transposition 7. If A and B are invertible matrices, what is the inverse of their product (AB)^(-1)?    - A) A^(-1) * B^(-1)    - B) AB    - C) B^(-1) * A^(-1)    - D) A^(-1) + B^(-1) 8. The determinant of the following matrix:           | 2  0  1 |    | 3  1  4 |    | 1 -1  3 |       - A) -6    - B) -7    - C) 6    - D) 7 9. What is the eigenvalue of the identity matrix?    - A) 1    - B) 0    - C) -1    - D) It doesn't have eigenvalues 10. If A is a 3x3 matrix and det(A) = 0, what can be said about A?     - A) A is invertible     - B) A is singular     - C) A is symmetric     - D) A is orthogonal 11. The product of a matrix and its transpose is always:     - A) Symmetric     - B) Diagonal     - C) Identity     - D) Skew-symmetric 12. If A and B are square matrices such that det(A) = 3 and det(B) = 2, what is det(A^(-1) * B)?     - A) 3     - B) 2     - C) 6     - D) 1/6 13. What is the adjugate of the identity matrix?     - A) Identity matrix     - B) Zero matrix     - C) Diagonal matrix     - D) Skew-symmetric matrix 14. If A is a 2x2 matrix with det(A) = 0, what can be said about A?     - A) A is invertible     - B) A is singular     - C) A is symmetric     - D) A is orthogonal 15. The determinant of a diagonal matrix is equal to:     - A) The product of its diagonal elements     - B) The sum of its diagonal elements     - C) The square of its diagonal elements     - D) 1 16. What is the rank of the following matrix?              | 1  2  3 |     | 0  0  0 |     | 4  5  6 |         - A) 1     - B) 2     - C) 3     - D) 0 17. If A is a skew-symmetric matrix, what can be said about its diagonal elements?     - A) They are always zero     - B) They are always positive     - C) They are always negative     - D) They can be any real number 18. The product of two orthogonal matrices is always:     - A) Symmetric     - B) Orthogonal     - C) Singular     - D) Skew-symmetric 19. If A and B are square matrices, what is the determinant of their sum, det(A + B)?     - A) det(A) + det(B)     - B) det(A + B)     - C) det(A) * det(B)     - D) det(A - B) 20. If A is a square matrix, what is the determinant of its inverse, det(A^(-1))?     - A) 1     - B) -1     - C) det(A)     - D) 0 answers will be released soon Comment your answers 👇 🎓 To Get More Questions 🎓 🔰 @AmboIfaBoru 🔰 @EUEE_Tips 🔰 @Official_Abdii_Sabaa 🔰 @Oromia_Educational_News MP™ Answer for maths questions on matrix and determinants 1. D 2. A 3. C 4. C 5. A 6. B 7. A 8. D 9. A 10. B 11. A 12. C 13. A 14. B 15. A 16. D 17. A 18. B 19. B 20. A

Aliyi Amade: 📃Matrix and Determinant Questions (EUEE Standard) 1. If A is a 2x3 matrix and B is a 3x4 matrix, what is the possible dimension of the product AB?    - A) 2x2    - B) 2x3    - C) 3x2    - D) 2x4 2. The determinant of the following matrix:      | 3  1 |   | 2  4 |       - A) 10    - B) 11    - C) 12    - D) 14 3. If A and B are square matrices of the same order, what is the result of det(A^T * B)?    - A) det(A) * det(B)    - B) det(A^T) * det(B)    - C) det(A * B)t    - D) det(B * A) 4. What is the rank of the matrix:           | 1  0  2 |    | 0  1  3 |    | 0  0  0 |       - A) 2    - B) 3    - C) 1    - D) 0 5. If A is an orthogonal matrix, what can be said about its eigenvalues?    - A) Always real    - B) Always complex    - C) Always negative    - D) Always positive 6. The product of a scalar and a matrix is obtained by multiplying each element of the matrix by the scalar. What is this operation called?    - A) Addition    - B) Scalar multiplication    - C) Determination    - D) Transposition 7. If A and B are invertible matrices, what is the inverse of their product (AB)^(-1)?    - A) A^(-1) * B^(-1)    - B) AB    - C) B^(-1) * A^(-1)    - D) A^(-1) + B^(-1) 8. The determinant of the following matrix:           | 2  0  1 |    | 3  1  4 |    | 1 -1  3 |       - A) -6    - B) -7    - C) 6    - D) 7 9. What is the eigenvalue of the identity matrix?    - A) 1    - B) 0    - C) -1    - D) It doesn't have eigenvalues 10. If A is a 3x3 matrix and det(A) = 0, what can be said about A?     - A) A is invertible     - B) A is singular     - C) A is symmetric     - D) A is orthogonal 11. The product of a matrix and its transpose is always:     - A) Symmetric     - B) Diagonal     - C) Identity     - D) Skew-symmetric 12. If A and B are square matrices such that det(A) = 3 and det(B) = 2, what is det(A^(-1) * B)?     - A) 3     - B) 2     - C) 6     - D) 1/6 13. What is the adjugate of the identity matrix?     - A) Identity matrix     - B) Zero matrix     - C) Diagonal matrix     - D) Skew-symmetric matrix 14. If A is a 2x2 matrix with det(A) = 0, what can be said about A?     - A) A is invertible     - B) A is singular     - C) A is symmetric     - D) A is orthogonal 15. The determinant of a diagonal matrix is equal to:     - A) The product of its diagonal elements     - B) The sum of its diagonal elements     - C) The square of its diagonal elements     - D) 1 16. What is the rank of the following matrix?              | 1  2  3 |     | 0  0  0 |     | 4  5  6 |         - A) 1     - B) 2     - C) 3     - D) 0 17. If A is a skew-symmetric matrix, what can be said about its diagonal elements?     - A) They are always zero     - B) They are always positive     - C) They are always negative     - D) They can be any real number 18. The product of two orthogonal matrices is always:     - A) Symmetric     - B) Orthogonal     - C) Singular     - D) Skew-symmetric 19. If A and B are square matrices, what is the determinant of their sum, det(A + B)?     - A) det(A) + det(B)     - B) det(A + B)     - C) det(A) * det(B)     - D) det(A - B) 20. If A is a square matrix, what is the determinant of its inverse, det(A^(-1))?     - A) 1     - B) -1     - C) det(A)     - D) 0 answers will be released soon Comment your answers 👇 🎓 To Get More Questions 🎓 🔰 @AmboIfaBoru 🔰 @EUEE_Tips 🔰 @Official_Abdii_Sabaa 🔰 @Oromia_Educational_News MP™ Answer for maths questions on matrix and determinants 1. D 2. A 3. C 4. C 5. A 6. B 7. A 8. D 9. A 10. B 11. A 12. C 13. A 14. B 15. A 16. D 17. A 18. B 19. B 20. A ❓Feel Free To Ask Questions in the Comments 👇

Unit Four          The African Peoples’ resistance against colonial expansion from 1870-1914 The struggle against colonialism had passed through different stages. The most important are:      Samori Toure of the Mandinka Samori Toure was one of those leaders in West Africa. He built an empire included the present town of Senegal, S-E .Mali and Guinea. Samori Toure acquired weapons through his trade with coastal towns and fought the French for several years. Finally, the French army succeeded in capturing Samori in 1898 and exiled him to the French colony of Gabon where he died two years later at the age of seventy.             The Ashanti Empire The Ashanti Empire emerged as a nation in the late 17th c. their empire stretched in the present day state of Ghana in West Africa. The empire was governed by the king who used the title Asantehene. The British began their colonial venture and called it the British Gold Coast Colony in 1874. The Ashanti were fought against the British and paid an immense sacrifices, but unable to defend British colonialism.                     The Urabi Pasha’s Rebellion in Egypt Urabi Pasha was a colonel in Egyptian army when British and French imperialism dominated Egypt and he was carried out a strong war of resistance against the imperialists. In 1881, the army of Urabi Pasha was finally defeated at the battle of Tel El-Kabir by British forces. Thereafter, Britain took full colonial control of Egypt since 1882.          The Mahaddist Movement in the Sudan The Mahdi which literally means the correct way of practicing Islam in Sudan began a religios and anti-colonial resistance movement against Egypt in 1881. The Mahaddists had defeated the forces of Gordon who is colonel governor in Sudan and Sudan achieved independence until it was invaded again in 1898. Finally, after a heroic resistance under the leadership of Khalifa Abdullahi successor of the Mahdi defeated at the battle of Omdurman in 1898. From 1898 onwards, Sudan fell under joint British and Egyptian control. This joint control was known as the Anglo-Egyptian Condominium Rule.                        The Maji Maji Rebellion One of the early resistances to the Germans in Zanzibar was led by Bushiri Ibn Salim. (an Arab sugar planter) The Germans tried to overcome this problem through 600 Sudanese mercenaries recruited from Egypt. But, the resistance was crushed and Bushiri was killed in the battle in 1889. The Maji Maji revolt broke out as reaction to the oppressive colonial policy of the Germans. This peasant rebellion becomes referred to as the Maji Maji revolt. The term Maji means water, in the Swahili language. Finally, the resistance was suppressed and the Germans continued with their harsh colonial rule.               The First World War (1914-1918) Causes of the First World War The rivalry among Imperialist powers. The industrial revolution was one of the major causes. When industry expanded in Western Europe the need for raw materials which were not available in their own countries were forced them for another countries in backward areas of the world. The Moroccan Crisis of 1905 and 1911 In 1904, Britain and France concluded an ant-German cordiale in which France got a free hand in Morocco and England had a free hand in Egypt and Sudan. Germany opposed the agreement sided with Morocco against French penetration of that land. The conflict was however resolved by international conference. Again in 1911, Germany challenged French claim over Morocco and the problem resolved when France gave same parts of Congo to Germany. Then France was given a free hand in Morocco. The Balkan Crisis. The subject nations in the Balkan region rose up against the religious and national oppression imposed by the Ottoman Turks and this led to the Balkan war of 1912 and 1913. The outcome of the war was that Turkey ousted almost from the Balkan Peninsula.