{
  "paper": {
    "school": "Singapore Chinese Girls' School",
    "year": 2023,
    "level": "P2",
    "label": "Quiz 4",
    "source_prefix": "SCGS 2023 P2 Quiz 4",
    "has_answer_key": true
  },
  "questions": [
    {
      "n": 1,
      "type_id": 1,
      "question": "The pencil is [?] cm long.",
      "answer0": "5",
      "answer1": "6",
      "answer2": "11",
      "answer3": "12",
      "correct_answer": 1,
      "skill_id": 50,
      "difficulty_id": 1,
      "explanation": "The pencil spans from 5 cm to 11 cm on the ruler, so its length is 11 - 5 = 6 cm.",
      "hints": ["Read the start mark and the end mark of the pencil on the ruler.", "Subtract the start reading from the end reading."],
      "source": "SCGS 2023 P2 Quiz 4 Q1",
      "image_needed": true,
      "image_options": false,
      "image_file": "q1.png",
      "image_page": 1,
      "image_loc": "ruler diagram (scissors, paper clip, pencil) in middle of page, shared by Q1 and Q2",
      "notes": "Answer key: option 2 (6 cm). Figure shared with Q2."
    },
    {
      "n": 2,
      "type_id": 1,
      "question": "The total length of the scissors and the paper clip is [?] cm.",
      "answer0": "9",
      "answer1": "13",
      "answer2": "15",
      "answer3": "18",
      "correct_answer": 2,
      "skill_id": 50,
      "difficulty_id": 2,
      "explanation": "Scissors length + paper clip length read off the ruler total 15 cm.",
      "hints": ["Measure the scissors length on the ruler, then the paper clip length.", "Add the two lengths together."],
      "source": "SCGS 2023 P2 Quiz 4 Q2",
      "image_needed": true,
      "image_options": false,
      "image_file": "q2.png",
      "image_page": 1,
      "image_loc": "ruler diagram (scissors, paper clip, pencil) in middle of page, shared by Q1 and Q2",
      "notes": "Answer key: option 3 (15 cm). Figure shared with Q1."
    },
    {
      "n": 3,
      "type_id": 1,
      "question": "Which of the following is the lightest?",
      "answer0": "P",
      "answer1": "R",
      "answer2": "S",
      "answer3": "T",
      "correct_answer": 3,
      "skill_id": 53,
      "difficulty_id": 2,
      "explanation": "From the three balances: P is heavier than R, S is heavier than R, and S is heavier than T. R sits higher than S and T overall; comparing all, T is the lightest. Answer key gives T.",
      "hints": ["On a balance, the side that rises holds the lighter object.", "Compare the objects across all three balances to find the one that is always lighter."],
      "source": "SCGS 2023 P2 Quiz 4 Q3",
      "image_needed": true,
      "image_options": false,
      "image_file": "q3.png",
      "image_page": 2,
      "image_loc": "three balance scales near top of page showing P/R, S/R and S/T",
      "notes": "Word/letter answer (object label) -> MCQ. Answer key: option 4 (T)."
    },
    {
      "n": 4,
      "type_id": 2,
      "question": "The chart shows the height of 4 girls. Ellen 134 cm, Fatimah 152 cm, Su Ling 127 cm, Kann 119 cm. Kann is shorter than the tallest girl by [?] cm.",
      "answer0": "33",
      "answer1": null,
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 54,
      "difficulty_id": 2,
      "explanation": "The tallest girl is Fatimah at 152 cm. Kann is 119 cm. 152 - 119 = 33 cm.",
      "hints": ["Find the tallest height in the chart.", "Subtract Kann's height from the tallest height."],
      "source": "SCGS 2023 P2 Quiz 4 Q4",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "image_page": null,
      "image_loc": null,
      "notes": "Answer key: 33 cm. Chart data transcribed into stem (small table, no figure crop needed)."
    },
    {
      "n": 5,
      "type_id": 2,
      "question": "Fill in the blanks with kg, g, m or cm. (a) The file is about 3 [?] thick. (b) The mass of a watermelon is about 2 [?].",
      "answer0": "cm",
      "answer1": "kg",
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 52,
      "difficulty_id": 1,
      "explanation": "(a) A file's thickness is small, so the suitable unit is cm. (b) A watermelon is heavy, so the suitable unit of mass is kg.",
      "hints": ["Choose a length unit (m, cm) for thickness and a mass unit (kg, g) for mass.", "Think about whether the amount is large or small to pick between the two."],
      "source": "SCGS 2023 P2 Quiz 4 Q5",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "image_page": null,
      "image_loc": null,
      "notes": "Answer key: (a) 3 cm, (b) 2 kg. Units are symbolic abbreviations -> FIB acceptable."
    },
    {
      "n": 6,
      "type_id": 2,
      "question": "The mass of the bag of rice is [?] kg.",
      "answer0": "3",
      "answer1": null,
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 53,
      "difficulty_id": 2,
      "explanation": "The balance is level. One side holds the bag of rice plus a 3 kg mass. The other side holds 1 kg + 1 kg + 2 kg + 2 kg = 6 kg. So bag + 3 = 6, giving bag = 3 kg.",
      "hints": ["Add up all the masses on the right side of the balance.", "The bag plus the 3 kg weight equals that total; subtract 3 kg."],
      "source": "SCGS 2023 P2 Quiz 4 Q6",
      "image_needed": true,
      "image_options": false,
      "image_file": "q6.png",
      "image_page": 3,
      "image_loc": "balance scale near top of page: bag of rice + 3 kg on left, four weight blocks (1kg,1kg,2kg,2kg) on right",
      "notes": "Answer key: 3 kg."
    },
    {
      "n": 7,
      "type_id": 2,
      "question": "A bag of sweets has a mass of 8g. Doris buys 5 bags of sweets. What is the total mass of 5 bags of sweets? The mass of 5 bags of sweets is [?] g.",
      "answer0": "40",
      "answer1": null,
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 40,
      "difficulty_id": 2,
      "explanation": "Each bag is 8 g and there are 5 bags: 8 x 5 = 40 g.",
      "hints": ["Multiply the mass of one bag by the number of bags.", "8 g x 5 = ?"],
      "source": "SCGS 2023 P2 Quiz 4 Q7",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "image_page": null,
      "image_loc": null,
      "notes": "Answer key: 40 g."
    },
    {
      "n": 8,
      "type_id": 2,
      "question": "The mass of the bunch of grapes is [?] g.",
      "answer0": "155",
      "answer1": null,
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 53,
      "difficulty_id": 2,
      "explanation": "The balance is level. The grapes balance the weights 5 g + 20 g + 30 g + 100 g = 155 g.",
      "hints": ["Add up all the weight labels on the other side of the balance.", "5 + 20 + 30 + 100 = ?"],
      "source": "SCGS 2023 P2 Quiz 4 Q8",
      "image_needed": true,
      "image_options": false,
      "image_file": "q8.png",
      "image_page": 3,
      "image_loc": "balance scale in middle of page: bunch of grapes on left, weights labelled 5g/20g/30g/100g on right",
      "notes": "Answer key: 155 g."
    },
    {
      "n": 9,
      "type_id": 2,
      "question": "Stick A is 96 cm long. Stick B is 13 cm longer than Stick A. How long is Stick B? Stick B is [?] cm long.",
      "answer0": "109",
      "answer1": null,
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 54,
      "difficulty_id": 2,
      "explanation": "Stick B is 13 cm longer than Stick A: 96 + 13 = 109 cm.",
      "hints": ["'Longer than' means add.", "96 + 13 = ?"],
      "source": "SCGS 2023 P2 Quiz 4 Q9",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "image_page": null,
      "image_loc": null,
      "notes": "Answer key: 96 + 13 = 109."
    },
    {
      "n": 10,
      "type_id": 2,
      "question": "A box with 3 bowling balls has a mass of 17 kg. The mass of the box is 2 kg when it is empty. What is the mass of each bowling ball? The mass of each bowling ball is [?] kg.",
      "answer0": "5",
      "answer1": null,
      "answer2": null,
      "answer3": null,
      "correct_answer": null,
      "skill_id": 54,
      "difficulty_id": 3,
      "explanation": "Mass of the 3 balls = 17 - 2 = 15 kg. Each ball = 15 ÷ 3 = 5 kg.",
      "hints": ["First subtract the empty box's mass to get the mass of the 3 balls.", "Then divide by 3 to find the mass of one ball."],
      "source": "SCGS 2023 P2 Quiz 4 Q10",
      "image_needed": false,
      "image_options": false,
      "image_file": null,
      "image_page": null,
      "image_loc": null,
      "notes": "Answer key: 17 - 2 = 15, 15 ÷ 3 = 5 (kg)."
    }
  ]
}