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New Curriculum

Extreme Series

Subject Physics

Grade  11

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New Curriculum

Extreme Series

Subject Chemistry

Grade  11

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Explanation: #1 Ans: A. The speed at which reactants are converted to products. Explanation: The rate of a chemical reaction refers to how quickly reactants are transformed into products. #2 Ans: A. Catalyst Explanation: A catalyst speeds up a reaction by providing an alternative pathway with a lower activation energy. #3 Ans: B. It increases the rate. Explanation: Increasing the concentration of reactants leads to more frequent collisions, which increases the reaction rate. #4 Ans: B. The rate increases. Explanation: Higher temperatures increase the kinetic energy of molecules, leading to more frequent and energetic collisions. #5 Ans: C. Color of reactants Explanation: The color of reactants does not affect the reaction rate. Factors like temperature, pressure, and surface area do. #6 Ans: C. The energy required to reach the transition state. Explanation: Activation energy is the minimum energy needed for reactants to form the transition state and proceed to products. #7 Ans: B. By decreasing the activation energy of the reaction. Explanation: Catalysts lower the activation energy, making it easier for the reaction to occur. #8 Ans: B. Smaller particles react faster. Explanation: Smaller particles have a larger surface area to volume ratio, increasing the area available for reaction. #9 Ans: B. Measuring the change in volume of gas produced. Explanation: Measuring the volume of gas produced is a common method to determine the rate of a reaction involving gases. #10 Ans: B. It increases the rate. Explanation: Increasing pressure in reactions involving gases increases the concentration of reactants, leading to more frequent collisions. #11 Ans: B. It can be influenced by environmental conditions. Explanation: The rate of a chemical reaction can be affected by factors like temperature, concentration, and the presence of a catalyst. #12 Ans: C. Volume of the container Explanation: The volume of the container does not directly affect the rate of reaction for a solid in a liquid. Surface area, concentration, and temperature do. #13 Ans: B. It increases the kinetic energy. Explanation: Higher temperatures increase the kinetic energy of molecules, resulting in more collisions and a higher reaction rate. 📍Short answer #14 Ans: Directly proportional Explanation: The rate of reaction is directly proportional to the frequency of effective collisions between reactant molecules. #15 Ans: Rate-determining step Explanation: The rate-determining step is the slowest step in a reaction mechanism, controlling the overall reaction rate. 📍 Comment suggestions below For More👇 ▬▬▬▬▬▬▬▬▬▬▬▬▬ 📚JOIN: @EntranceExamu 📚JOIN: @ExtremeSeries 📚JOIN: @CometAcademy 📚JOIN: @EthioEducationc 📚JOIN: @IfaBoruAcademy 📚JOIN: @UEntranceExam

Entrance Questions: Chemistry Unit-4 Chemical kinetics 1. What is the rate of a chemical reaction? A. The speed at which reactants are converted to products. B. The energy required to start a reaction. C. The heat released during a reaction. D. The number of molecules in a reaction mixture. 2. Which factor increases the rate of a chemical reaction by providing an alternative pathway with a lower activation energy? A. Catalyst B. Inhibitor C. Concentration D. Temperature 3. How does increasing the concentration of reactants affect the rate of a reaction? A. It decreases the rate. B. It increases the rate. C. It has no effect on the rate. D. It stops the reaction. 4. What happens to the rate of reaction when the temperature is increased? A. The rate decreases. B. The rate increases. C. The rate remains unchanged. D. The reaction stops. 5. Which of the following factors does NOT affect the rate of a chemical reaction? A. Temperature B. Pressure C. Color of reactants D. Surface area 6. In the context of reaction rates, what does the term "activation energy" refer to? A. The energy required to break bonds in the reactants. B. The energy released when products are formed. C. The energy required to reach the transition state. D. The total energy of the reactants. 7. How does a catalyst increase the rate of a chemical reaction? A. By increasing the temperature of the reaction. B. By decreasing the activation energy of the reaction. C. By increasing the concentration of reactants. D. By decreasing the surface area of reactants. 8. What is the effect of particle size on the rate of reaction? A. Larger particles react faster. B. Smaller particles react faster. C. Particle size has no effect. D. Only the shape of particles affects the rate. 9. Which of the following is a common method to measure the rate of a reaction? A. Measuring the change in color over time. B. Measuring the change in volume of gas produced. C. Measuring the change in temperature. D. Measuring the mass of the reactants. 10. What is the general effect of increasing pressure on the rate of a reaction involving gases? A. It decreases the rate. B. It increases the rate. C. It has no effect on the rate. D. It reverses the reaction. 11. Which of the following statements is true about the rate of a chemical reaction? A. It is always constant. B. It can be influenced by environmental conditions. C. It is independent of reactant concentration. D. It decreases with increasing temperature. 12. Which factor does NOT affect the rate of reaction for a solid in a liquid? A. Surface area of the solid B. Concentration of the liquid C. Volume of the container D. Temperature 13. How does increasing the temperature generally affect the kinetic energy of the molecules involved in a reaction? A. It decreases the kinetic energy. B. It increases the kinetic energy. C. It has no effect on kinetic energy. D. It stops molecular motion. 📍Short answer 14. What is the relationship between the frequency of effective collisions and the rate of reaction? 15. In a reaction where the rate is determined by the slowest step, what is this step called? 📍Comment your answer and suggestions below For More👇 ▬▬▬▬▬▬▬▬▬▬▬▬▬ 📚JOIN: @EntranceExamu 📚JOIN: @ExtremeSeries 📚JOIN: @CometAcademy 📚JOIN: @EthioEducationc 📚JOIN: @IfaBoruAcademy 📚JOIN: @UEntranceExam

Mathematics Grade 11 Unit-5 Vector 1. Which of the following best represents a vector quantity? A. Temperature B. Distance C. Displacement D. Speed 2. A vector is characterized by: A. Only magnitude B. Only direction C. Both magnitude and direction D. Neither magnitude nor direction 3. Which of the following is a correct representation of a vector in 3-dimensional space? A. (z,x, y) B. (x, y, z) C. (x, y) D. (x, z, y) 4. The position vector of a point P(x, y, z) is given by: A. r = xi + yj B. r = xi + yj + zk C. r = xi + yk D. r = xj + yk + zi 5. Which of the following vectors has the same direction as A = 3i - 4j + 5k? A. B = -3i + 4j - 5k B. C = 6i - 8j + 10k C. D = 1i - 2j + 3k D. E = 3i + 4j - 5k 6. The sum of two vectors A = 2i + 3j and B = 4i - j is: A. 6i + 2j B. 2i + 4j C. 8i + 6 D. 4i + 2j 7. Which of the following properties is NOT true for vector subtraction? A. Commutative property B. Associative property C. Distributive property D. None 8. For two vectors A and B, the vector A + B represents: A. The difference of A and B B. The combined effect of A and B C. The projection of A onto B D. The perpendicular vector to both A and B 9. If a vector A = 5i - 2j and B = -3i + bj , what is the value of b if the magnitude of there sum is two root two? A. 6 B. 2 C. 4 D. 10 10. The magnitude of the resultant vector (A + B) for A = 3i + 4j and B = -3i + 4j is: A. 5 B. 8 C. 10 D. 16 11. The vector subtraction (A - B) is the same as: A. Adding the magnitudes of A and B B. Adding A to the negative of B C. Subtracting the magnitudes of A and B D. Subtracting the direction angles of A and B 12. Vector subtraction is used to find: A. The resultant of two vectors B. The projection of one vector on another C. The difference between two vectors D. The dot product of two vectors 13. If A = ai + bj + ck, the magnitude of A is: A. (a + b + c) B. (a^2 + b^2 + c^2) C. (sqrt {a^2 + b^2 + c^2}) D. (sqrt {a + b + c}) 📍Short answer 14. Two vectors are said to be orthogonal if: 15. The cross product of two parallel vectors: 📍 Comment your answer and suggestions below 👇👇👇 For More👇 ▬▬▬▬▬▬▬▬▬▬▬▬▬ 📚JOIN: @EntranceExamu 📚JOIN: @ExtremeSeries 📚JOIN: @CometAcademy 📚JOIN: @EthioEducationc 📚JOIN: @IfaBoruAcademy 📚JOIN: @UEntranceExam

Explanations: #1 Ans: C. Displacement Explanations: Displacement is a vector quantity because it has both magnitude and direction. #2 Ans: C. Both magnitude and direction Explanations: A vector is characterized by having both magnitude and direction. #3 Ans: B. (x, y, z) Explanations: The correct order for representing a vector in 3-dimensional space is (x, y, z). #4 Ans: B. r = xi + yj + zk Explanations: The position vector of a point P(x, y, z) is represented by r = xi + yj + zk. #5 Ans: B. C = 6i - 8j + 10k Explanations: C has the same direction as A because it is a scalar multiple of A. #6 Ans: A. 6i + 2j Explanations: Adding the components of A and B: (2i + 4i) + (3j - j) = 6i + 2j. #7 Ans: A. Commutative property Explanations: Vector subtraction is not commutative; A - B is not the same as B - A. #8 Ans: B. The combined effect of A and B Explanations: A + B represents the combined effect (or resultant) of vectors A and B. #9 Ans: C. 4 Explanations: For the magnitude to be 2(sqrt{2}), solve sqrt{(5 + (-3))^2 + (-2 + b)^2} = 2(sqrt{2}). Simplifies to sqrt{4 + (-2 + b)^2} = 2(sqrt{2}), giving (4 + (b-2)^2 = 8). So, ( (b-2)^2 = 4), hence (b-2= 2) If we Add 2 to both sides , we will get (b=4). #10 Ans: B. 8 Explanations: Sum of vectors A and B: (3i - 3i) + (4j + 4j) = 0i + 8j. Magnitude = sqrt{0^2 + 8^2} = 8. #11 Ans: B. Adding A to the negative of B Explanations: Subtracting B from A means adding A to the negative of B; (A + (-B)). #12 Ans: C. The difference between two vectors Explanations: Vector subtraction gives the difference between two vectors. #13 Ans: C. sqrt{a^2 + b^2 + c^2} Explanations: The magnitude of A is given by the square root of the sum of the squares of its components. 📍Short Answer #14 Ans: Two vectors are said to be orthogonal if: Explanations: Their dot product is zero. #15 Ans: The cross product of two parallel vectors: Explanations: Is the zero vector. 📍Comment your suggestions below For More👇 ▬▬▬▬▬▬▬▬▬▬▬▬▬ 📚JOIN: @EntranceExamu 📚JOIN: @ExtremeSeries 📚JOIN: @CometAcademy 📚JOIN: @EthioEducationc 📚JOIN: @IfaBoruAcademy 📚JOIN: @UEntranceExam

Extreme Series

Exam Book

Social Science

Grade  11-12

Year 2010-2014/15

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Biology 1. Which organelle is responsible for protein synthesis? (a) Ribosomes (b) Mitochondria (c) Golgi apparatus (d) Nucleus 2. What is the semi-permeable barrier that surrounds the cell? (a) Cell membrane (b) Cell wall (c) Cytoplasm (d) Nucleus 3. Which type of cell does not have a nucleus? (a) Prokaryotic cell (b) Eukaryotic cell (c) Plant cell (d) Animal cell 4. What is the function of the cytoskeleton? (a) To store genetic material (b) To transport materials (c) To provide structural support (d) To synthesize proteins 5. Which organelle is responsible for cellular respiration? (a) Mitochondria (b) Chloroplasts (c) Ribosomes (d) Golgi apparatus 6. Which type of cell is found in plants but not in animals? (a) Prokaryotic cell (b) Eukaryotic cell (c) Plant cell (d) Animal cell 7. Which type of cell has a cell wall made of cellulose? (a) Prokaryotic cell (b) Eukaryotic cell (c) Plant cell (d) Animal cell 8. Which type of cell has a large central vacuole? (a) Prokaryotic cell (b) Eukaryotic cell (c) Plant cell (d) Animal cell 9. Which type of cell is specialized for muscle contraction? (a) Muscle cell (b) Nerve cell (c) Red blood cell (d) White blood cell 10. Which type of cell is responsible for fighting infection? (a) Muscle cell (b) Nerve cell (c) Red blood cell (d) White blood cell 11. Which type of microscope uses visible light to magnify objects? (a) Light microscope (b) Electron microscope (c) Scanning probe microscope (d) Fluorescence microscope 12. What is the function of the objective lens? (a) To magnify the image (b) To focus the light (c) To collect light (d) To project the image 13. Which type of microscope has the highest magnification? (a) Light microscope (b) Electron microscope (c) Scanning probe microscope (d) Fluorescence microscope 14. What is the function of the diaphragm? (a) To control the amount of light entering the microscope (b) To focus the light (c) To magnify the image (d) To project the image 15. What is the difference between brightfield and darkfield microscopy? (a) Brightfield microscopy uses transmitted light, while darkfield microscopy uses reflected light. (b) Darkfield microscopy uses transmitted light, while brightfield microscopy uses reflected light. (c) Brightfield microscopy has a higher resolution than darkfield microscopy. (d) Darkfield microscopy has a higher resolution than brightfield microscopy. 📘Answer Key: 1. a 2. a 3. a 4. c 5. a 6. c 7. c 8. c 9. a 10. d 11. a 12. a 13. b 14. a 15. a ▬▬▬▬▬▬▬▬▬▬▬▬▬ 📚JOIN: @EntranceExamu 📚JOIN: @ExtremeSeries 📚JOIN: @CometAcademy 📚JOIN: @EthioEducationc 📚JOIN: @IfaBoruAcademy 📚JOIN: @UEntranceExam

📘Geography Common questions about Population, Economics & Environment 1. Which of the following is NOT a common reason for implementing a pro-natalist population policy?    a) Declining birth rates     b) Aging population     c) Concerns about overpopulation     d) Shrinking workforce   Answer: c) Concerns about overpopulation 2. China's "One-Child Policy" (now revised) is an example of a:    a) Pro-natalist policy    b) Anti-natalist policy     c) Migration policy    d) Eugenic policy   Answer: b) Anti-natalist policy 3. "Brain drain" is a potential negative consequence of:     a) High birth rates     b) Low life expectancy     c) Emigration     d) Immigration     Answer: c) Emigration 4. Which demographic measure provides information about the average number of children a woman will have in her lifetime?     a) Crude birth rate     b) Total fertility rate     c) Infant mortality rate     d) Life expectancy     Answer: b) Total fertility rate 5. Gender imbalance (significantly more males than females) in a population can be a result of:    a) Pro-natalist policies    b) Anti-natalist policies with cultural preferences     c) High infant mortality rates    d) Low life expectancy   Answer: b) Anti-natalist policies with cultural preferences 6. Free trade agreements primarily aim to:     a) Protect domestic industries from foreign competition     b) Reduce or eliminate barriers to trade between countries     c) Promote fair labor practices in developing countries     d) Increase government revenue through tariffs    Answer: b) Reduce or eliminate barriers to trade between countries 7. Which economic sector is typically dominant in countries in the early stages of development?     a) Primary (agriculture, mining)     b) Secondary (manufacturing)     c) Tertiary (services)     d) Quaternary (knowledge-based)     Answer: a) Primary (agriculture, mining) 8. Sustainable development emphasizes:     a) Maximizing short-term economic growth     b) Meeting present needs without compromising the ability of future generations to meet their own needs     c) Focusing solely on environmental protection     d) Prioritizing economic growth over social equity     Answer: b) Meeting present needs without compromising the ability of future generations to meet their own needs 9. Which of the following is an example of a trade barrier?    a) Free trade agreement    b) Tariff    c) Foreign direct investment    d) Globalization   Answer: b) Tariff 10. The process of economic activities becoming interconnected and integrated globally is known as:    a) Industrialization    b) Deindustrialization    c) Globalization    d) Urbanization    Answer: c) Globalization 11. Which of the following is a major contributor to global climate change?    a) Volcanic eruptions    b) Burning of fossil fuels    c) Solar flares    d) Earthquakes    Answer: b) Burning of fossil fuels 12. Cap-and-trade programs are designed to address:    a) Overpopulation    b) Deforestation    c) Air and water pollution    d) Poverty    Answer: c) Air and water pollution For More👇 ▬▬▬▬▬▬▬▬▬▬▬▬▬ 📚JOIN: @EntranceExamu 📚JOIN: @ExtremeSeries 📚JOIN: @CometAcademy 📚JOIN: @EthioEducationc 📚JOIN: @IfaBoruAcademy 📚JOIN: @UEntranceExam

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