Evaluation Results

{"evaluation": [{"score": "1", "remark": "Student selected option C, 'electric motor', which is the correct answer. Heating effect of electric current is not observed in an electric motor.", "is_attempted": 1, "question_number": "1(A) i", "is_marks_counted": "1", "is_answer_correct": 1, "answer_page_number": ["1"], "max_possible_score": "1"}, {"score": "0", "remark": "Student selected option A, 'Digestion of food'. The correct answer is B, 'Boiling water', which is a physical change, not a chemical change.", "is_attempted": 1, "question_number": "1(A) ii", "is_marks_counted": "1", "is_answer_correct": 0, "answer_page_number": ["1"], "max_possible_score": "1"}, {"score": "1", "remark": "Student answered 'Galvanometer', which is the correct instrument used for detecting and measuring electric current.", "is_attempted": 1, "question_number": "1(A) iii", "is_marks_counted": "1", "is_answer_correct": 1, "answer_page_number": ["1"], "max_possible_score": "1"}, {"score": "1", "remark": "Student answered 'to have uniform heating', which is the correct reason for stirring an ice and water mixture while heating.", "is_attempted": 1, "question_number": "1(A) iv", "is_marks_counted": "1", "is_answer_correct": 1, "answer_page_number": ["1"], "max_possible_score": "1"}, {"score": "1", "remark": "Student answered 'hydrogen' gas, which is correctly liberated when aluminium metal reacts with dilute hydrochloric acid.", "is_attempted": 1, "question_number": "1(A) v", "is_marks_counted": "1", "is_answer_correct": 1, "answer_page_number": ["1"], "max_possible_score": "1"}, {"score": "0", "remark": "Student identified 'rubber gloves' as the odd one out. The correct odd one out is 'Generator' because others restrict current flow while a generator produces current. No justification was provided by the student.", "is_attempted": 1, "question_number": "1(B) i", "is_marks_counted": "1", "is_answer_correct": 0, "answer_page_number": ["1"], "max_possible_score": "1"}, {"score": "1", "remark": "Student provided a definition for specific latent heat of fusion that correctly captures the key elements: heat energy absorbed, constant temperature, unit mass, solid to liquid transformation. This matches the key's definition.", "is_attempted": 1, "question_number": "1(B) ii", "is_marks_counted": "1", "is_answer_correct": 1, "answer_page_number": ["1"], "max_possible_score": "1"}, {"score": "1", "remark": "Student correctly stated '0' (zero) for the kinetic energy of a body at infinite distance from the earth.", "is_attempted": 1, "question_number": "1(B) iii", "is_marks_counted": "1", "is_answer_correct": 1, "answer_page_number": ["2"], "max_possible_score": "1"}, {"score": "0", "remark": "Student attempted to create a table of relationships involving mass, force, and units. However, the relationships listed ('mass-M/S²', 'kg-m/s²') are incorrect and do not match the specific relationships expected from the key (Mass-kg, Mass-Measure of inertia, N-Zero at the centre, m/s²-Depends on height).", "is_attempted": 1, "question_number": "1(B) iv", "is_marks_counted": "1", "is_answer_correct": 0, "answer_page_number": ["2"], "max_possible_score": "1"}, {"score": "0", "remark": "Student's reasoning for only 8 elements in the third period is confused and contradictory. It mentions shell capacities but fails to correctly explain how the electron octet rule limits the number of elements in the period, as detailed in the key.", "is_attempted": 1, "question_number": "2(A) i", "is_marks_counted": "1", "is_answer_correct": 0, "answer_page_number": ["3"], "max_possible_score": "2"}, {"score": "0.5", "remark": "Student vaguely mentions air saturation/humidity and the observation of the white trail in winter. However, they fail to identify the trail as condensed vapour or clearly link its formation to high relative humidity, which is central to the key's explanation. Awarded partial credit (0.5) for touching upon the concept of humidity/saturation.", "is_attempted": 1, "question_number": "2(A) iii", "is_marks_counted": "1", "is_answer_correct": 0, "answer_page_number": ["3"], "max_possible_score": "2"}, {"score": "0.5", "remark": "Student only attempted part (a). For part (a), the student correctly states that humid air contains moisture and dry air does not. However, the key defines the difference based on relative humidity percentage (>60% for humid, <60% for dry), which the student missed. The temperature comment is not universally correct. Awarded partial credit (0.5) for correctly identifying the presence/absence of moisture. Part (b) was not attempted.", "is_attempted": 1, "question_number": "2(B) iii", "is_marks_counted": "1", "is_answer_correct": 0, "answer_page_number": ["7"], "max_possible_score": "2"}, {"score": "1", "remark": "Part (a): Student correctly defined a redox reaction (1 mark). However, the example provided (2H₂S + SO₂ → 3SO₂ + 2H₂O) is incorrect, and no explanation of oxidation/reduction within the example was given (0 marks). Part (b): Student incorrectly identified 'fe' as the oxidizing agent in the given reaction (0 marks); the key states H₂O is the oxidizing agent.", "is_attempted": 1, "question_number": "3 i", "is_marks_counted": "1", "is_answer_correct": 0, "answer_page_number": ["4"], "max_possible_score": "3"}, {"score": "0.5", "remark": "Part i: Student incorrectly identified Plot (I) as '45 minutes' instead of Thermometer B (0 marks). Part ii: Student related Point Z to 4°C and anomalous behaviour, which is partially correct, but did not explicitly state it denotes the temperature of maximum water density (0.5 marks). Part iii: Student incorrectly stated the anomalous behaviour range as only 4°C instead of the correct range 0°C to 4°C (0 marks).", "is_attempted": 1, "question_number": "3 ii", "is_marks_counted": "1", "is_answer_correct": 0, "answer_page_number": ["4"], "max_possible_score": "3"}, {"score": "1", "remark": "Part (a): Student listed wire materials (tungsten, copper) instead of the types of wires used in household circuits (phase, neutral, earth) as per the key (0 marks). Part (b): Student correctly stated that the North pole of the magnetic needle will move towards wire XY (1 mark). Part (c): Student described the working of an electric motor (motion due to current) rather than the working principle of an electric generator (magnetic effect of electric current / electromagnetic induction) as per the key (0 marks).", "is_attempted": 1, "question_number": "3 v", "is_marks_counted": "1", "is_answer_correct": 0, "answer_page_number": ["5"], "max_possible_score": "3"}, {"score": "1", "remark": "Part i: Student correctly identified Element A as Magnesium but misspelled Element B as 'Bernunn' instead of Beryllium (0.5 marks). Part ii: Student incorrectly stated that these elements do not belong to the same group and gave an incorrect justification (0 marks). Part iii: Student correctly identified Magnesium (Element A) as more electropositive but provided an incorrect reason (0.5 marks); the correct reason relates to increasing atomic size down the group.", "is_attempted": 1, "question_number": "3 vi", "is_marks_counted": "1", "is_answer_correct": 0, "answer_page_number": ["5"], "max_possible_score": "3"}, {"score": "2.5", "remark": "Student correctly provided the electronic configurations for all elements listed (1 mark). For the 'Type of element', 6 out of 7 were correctly identified (Na, Mg, Al, Si, S, Cl). Phosphorus was incorrectly identified as a metalloid instead of a nonmetal. Awarded 1.5 marks for the types (out of 2), resulting in a total of 1 + 1.5 = 2.5 marks.", "is_attempted": 1, "question_number": "3 vii", "is_marks_counted": "1", "is_answer_correct": 1, "answer_page_number": ["5"], "max_possible_score": "3"}, {"score": "3", "remark": "Part (a): Student successfully balanced the chemical equation H₂S₂O₇(l) + H₂O(l) → H₂SO₄(l) by arriving at the correct final stoichiometry (implied by atom counts in the table), despite the intermediate steps being unclear. Awarded full marks for balancing (3 marks). Part (b): Student incorrectly identified the reductant and oxidant in both given reactions (0 marks).", "is_attempted": 1, "question_number": "4 ii", "is_marks_counted": "1", "is_answer_correct": 1, "answer_page_number": ["6", "7"], "max_possible_score": "5"}]}

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