Entrance Questions

Mathematics 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 👇👇👇

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

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

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Answers and explanations for the multiple-choice questions on Capacitors and Capacitance: 1. B) Farad Explanation: The SI unit of capacitance is the Farad, symbol F. 2. D) Charge on the plates Explanation: The capacitance of a capacitor is directly proportional to the area of the plates and the permittivity of the dielectric material, and inversely proportional to the distance between the plates. 3. A) Increases Explanation: When a dielectric material is inserted between the plates of a capacitor, the capacitance increases due to the material's ability to store more charge. 4. A) Area of the plates Explanation: In a parallel plate capacitor, the capacitance is directly proportional to the area of the plates. 5. C) Quadruples Explanation: The energy stored in a capacitor is directly proportional to the square of the potential difference across it. 6. A) 1/2CV^2 Explanation: The energy stored in a capacitor is given by the formula 1/2CV^2, where C is the capacitance and V is the potential difference across the capacitor. 7. A) Increases Explanation: The capacitance of a capacitor increases when the distance between the plates is increased. 8. B) Square of the voltage across the capacitor Explanation: The total energy stored in a capacitor is directly proportional to the square of the voltage across the capacitor. 9. C) Glass Explanation: Glass is a common dielectric material used in capacitors due to its insulating properties. 10. A) Storing charge Explanation: Capacitors are used in electrical circuits to store and release electrical energy in the form of charge. 📄 Prepared By || @EUEE_TIPS ▬▬▬▬▬▬▬▬▬▬▬▬▬ 📚JOIN: @Ethio_Educational_News 📚JOIN: @EUEE_TIPS 📚JOIN: @Et_Study_Notes 📚JOIN: @Oromia_Educational_News

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10 Multiple Choice Questions From Phyisics Grade 11 Unit 6 Capacitor and Capacitance Topic 1. What is the SI unit of capacitance? A) Ohm B) Farad C) Coulomb D) Volt 2. Which of the following factors does not affect the capacitance of a capacitor? A) Area of the plates B) Distance between the plates C) Dielectric material between the plates D) Charge on the plates 3. When a dielectric material is inserted between the plates of a capacitor, what happens to the capacitance? A) Increases B) Decreases C) Remains the same D) Fluctuates 4. In a parallel plate capacitor, the capacitance is directly proportional to: A) Area of the plates B) Distance between the plates C) Both area and distance D) Charge on the plates 5. If the potential difference across a capacitor is doubled, what happens to the stored energy in the capacitor? A) Doubles B) Halves C) Quadruples D) Remains the same 6. The energy stored in a capacitor is given by the formula: A) 1/2CV^2 B) CV C) Q/V D) C/V 7. What happens to the capacitance of a capacitor if the distance between the plates is increased? A) Increases B) Decreases C) Remains the same D) Becomes zero 8. The total energy stored in a capacitor is directly proportional to: A) Voltage across the capacitor B) Square of the voltage across the capacitor C) Inverse of the voltage across the capacitor D) Charge on the plates 9. Which of the following materials is commonly used as a dielectric in capacitors? A) Copper B) Air C) Glass D) Silver 10. Capacitors are commonly used in electrical circuits for: A) Storing charge B) Regulating current C) Increasing resistance D) Decreasing voltage fluctuations Prepared By: @EUEE_TIPS ▬▬▬▬▬▬▬▬▬▬▬▬▬ 📚JOIN: @Ethio_Educational_News 📚JOIN: @EUEE_TIPS 📚JOIN: @Et_Study_Notes 📚JOIN: @Oromia_Educational_News

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