Biology 2015 E.C - 2023 G.C 2014 E.C - 2022 G.C Chemistry 2015 E.C - 2023 G.C Civics and Ethical Education 2015 E.C - 2023 G.C English 2015 E.C - 2023 G.C Geography 2015 E.C - 2023 G.C History 2015 E.C - 2023 G.C Physics 2015 E.C - 2023 G.C Chemistry - Grade 12 -2023 G.C Grade 12 students can now access their exam results by visiting the Educational Assessment and Examination Services (EAES) website. Previous1234567891011121314151617Next 45. A forward and reverse reaction continues to take place at equal rate in microscopic level without change in composition at macroscopic level. This statement is the definition of The law of mass action Degree of freedom Dynamic equilibrium Chemical kinetics 46. What are the four quantum numbers for an electron in a 2s orbital? 2,0,1,+½ 2,0,0,+½ 2,1,1,+½ 2,1,0,+½ 47. A student uses a digital balance (±0.02), a thermometer (±0.1), a measuring cylinder (±0.05), and a beaker (±0.5) during an experiment. Which of the above instrument is more precise? The measuring cylinder The Beaker The digital balance The thermometer 48. Which one of the following explains that light has BOTH wave and particle nature? Light consists of electromagnetic waves which have an oscillating electric and magnetic disturbance that spreads electromagnetic radiation. Microscopic systems, such as atoms and molecules can possess wave properties. An electron that is bound to the nucleus behaves like a standing wave and its position is given in terms of probability. A beam of light is a stream of particles of electromagnetic energy, with energy proportional to the observed frequency of the light. 49. A nuclear breakdown in which particles or electromagnetic radiation is emitted is _______________. Radioactive decay Radio wave Radioactivity Radioactive isotopes Previous1234567891011121314151617Next We have provided these questions from previous years grade 12 Ethiopian Secondary School Leaving Certificate Examination (ESSLCE) exams with the sole purpose of assisting students in their studies and preparations for upcoming exams. Please be aware that these questions are not indicative of future exam content. Good luck with your studies!