{
  "examTitle": "Day 3 Mock Exam: Fire Safety & Extinguishers",
  "questions": [
    { "q": "What is a major cause of fire on a construction site?", "options": ["Electrical faults and hot works", "Good housekeeping", "Safe storage of fuel", "Drinking water"], "correct": 0, "explanation": "The vast majority of construction site fires are triggered by electrical malfunctions (overloaded circuits, damaged cables) or hot works (welding, cutting, grinding) producing sparks near combustible materials." },
    { "q": "Which of these is a flammable material hazard?", "options": ["Fuel, gases, and solvents", "Bricks and sand", "Steel beams", "Hard hats"], "correct": 0, "explanation": "Liquid fuels, compressed gases (like LPG or acetylene), and chemical solvents ignite easily and possess high flame-spread velocity, making them severe fire hazards." },
    { "q": "How can you reduce the 'Fire Load' on site?", "options": ["Good housekeeping and waste removal", "Bringing more wood to site", "Leaving trash in walkways", "Stacking empty boxes high"], "correct": 0, "explanation": "'Fire load' refers to the total amount of combustible material available to feed a fire. Maintaining tidy walkways and clearing timber, packaging, and waste daily keeps this load as low as possible." },
    { "q": "What is required for high-risk 'Hot Works' like welding?", "options": ["A permit system", "A lunch break", "A louder radio", "A different helmet"], "correct": 0, "explanation": "A formal Hot Work Permit system enforces strict safety controls—such as clearing nearby flammables, positioning dedicated extinguishers, and setting a mandatory post-work fire watch." },
    { "q": "Which fire extinguisher has a RED label?", "options": ["Water", "Foam", "CO2", "Dry Powder"], "correct": 0, "explanation": "Under British Standard BS EN 3, all extinguisher bodies are red, but a solid Red block or signal element indicates a standard Water extinguisher." },
    { "q": "What color is the label on a FOAM extinguisher?", "options": ["Cream", "Red", "Black", "Blue"], "correct": 0, "explanation": "A Cream block or signal band denotes a Foam extinguisher, which is primarily formulated to tackle Class B liquid fires by blanketing the surface." },
    { "q": "Which extinguisher has a BLACK label?", "options": ["Carbon Dioxide (CO2)", "Water", "Foam", "Dry Powder"], "correct": 0, "explanation": "A Black block or color band signifies a Carbon Dioxide (CO2) extinguisher, which is ideal for smothering electrical risks without leaving a messy residue." },
    { "q": "What color is the label on a DRY POWDER extinguisher?", "options": ["Blue", "Red", "Cream", "Black"], "correct": 0, "explanation": "A Blue block or label denotes a Dry Powder extinguisher. It is highly versatile and capable of tackling Class A, B, and C structural or fuel fires." },
    { "q": "Which extinguisher is used ONLY for Class A fires (wood/paper)?", "options": ["Water", "CO2", "Foam", "Dry Powder"], "correct": 0, "explanation": "Standard water extinguishers are specifically designed for Class A solid organic fires. They provide a powerful cooling mechanism but are dangerous to use on electrical or liquid fires." },
    { "q": "What is a 'Class A' fire?", "options": ["Solid materials like wood and paper", "Flammable liquids", "Electrical equipment", "Metals"], "correct": 0, "explanation": "Class A fires involve ordinary carbonaceous solid materials such as wood, paper, textiles, cardboard, and organic waste." },
    { "q": "Which fire class involves flammable liquids like fuel or paint?", "options": ["Class B", "Class A", "Class C", "Class D"], "correct": 0, "explanation": "Class B fires involve flammable liquids or liquefiable solids, including petrol, diesel, oils, paraffin, paints, and solvent-based compounds." },
    { "q": "Which extinguisher is safe for live electrical fires?", "options": ["CO2 and Dry Powder", "Water only", "Foam only", "Wet cloth"], "correct": 0, "explanation": "Carbon Dioxide (CO2) and Dry Powder are non-conductive extinguishing agents, making them safe to discharge around live electrical wiring, circuitry, and machinery." },
    { "q": "Why should you NEVER use water on an electrical fire?", "options": ["It conducts electricity and causes a shock", "It makes too much steam", "It is too heavy", "It smells bad"], "correct": 0, "explanation": "Water is an excellent conductor of electricity. Spraying a stream of water onto a live electrical hazard creates an immediate path for current to travel back up to the operator, causing severe electrocution." },
    { "q": "Which extinguisher is suitable for Class A, B, and C fires?", "options": ["Dry Powder", "Water", "Foam", "CO2"], "correct": 0, "explanation": "Dry Powder is known as an ABC multi-purpose extinguisher because it can suppress solid fuel fires, liquid fires, and flammable gas fires safely." },
    { "q": "What is a 'Class C' fire?", "options": ["Flammable gases", "Solid wood", "Burning metals", "Electrical sparks"], "correct": 0, "explanation": "Class C fires involve flammable gases, such as propane, butane, methane, and natural gas or acetylene cylinders found on construction sites." },
    { "q": "When should you attempt to extinguish a fire?", "options": ["Only if it is safe and you are trained", "Whenever you see one", "If you are bored", "To win a medal"], "correct": 0, "explanation": "You should only tackle a fire if the alarm has been raised, you have a safe escape path behind you, you are officially trained on the equipment, and the fire is small and contained." },
    { "q": "Why is 'Zero Tolerance' for drugs/alcohol part of fire safety?", "options": ["They cause poor judgement and increase risk", "They are expensive", "They make people sleep", "They are for after work"], "correct": 0, "explanation": "Intoxicants impair motor functions, delay sensory reflexes, and warp risk judgment, making individuals much more likely to spark a fire or fail to react properly during an emergency evacuation." },
    { "q": "What is a hazard of 'Hot Works'?", "options": ["Sparks igniting nearby fuel", "The color of the sparks", "The noise of the machine", "The cost of the welding rod"], "correct": 0, "explanation": "Hot works eject high-temperature slag, sparks, and open heat energy. If these drift onto nearby debris, fuel vapors, or timber, they can trigger a slow-burning or rapid fire." },
    { "q": "How does maintenance prevent fires in site plant?", "options": ["It prevents fuel leaks and hot engines", "It makes the plant look new", "It saves on insurance", "It makes the tires last longer"], "correct": 0, "explanation": "Regular servicing identifies fuel/oil pipe leaks, replaces clogged filters, and ensures electrical wiring doesn't short-circuit against a hot engine bay, reducing machinery fires." },
    { "q": "What is a 'Fire Watch'?", "options": ["Monitoring an area after hot work finishes", "A clock that looks like a flame", "A site security guard", "A group of firefighters"], "correct": 0, "explanation": "Because hot work sparks can smolder undetected for hours inside insulation or timber gaps, a trained person must actively monitor the hot work area for a set period (usually 30-60 minutes) after work concludes." },
    { "q": "Where should flammable chemicals be stored?", "options": ["In a secure, correctly labeled area", "In the site canteen", "In the back of a van", "Under a staircase"], "correct": 0, "explanation": "Highly flammable items must be secured inside a designated, fire-resistant, and ventilated storage container or locker marked clearly with warning symbols." },
    { "q": "Which sign color indicates a fire exit route?", "options": ["Green", "Red", "Blue", "Yellow"], "correct": 0, "explanation": "Fire doors and escape routes are classified as Safe Condition signs, meaning they are always square/rectangular green panels with clear white text or directional running-man symbols." },
    { "q": "What is the 'Fire Triangle'?", "options": ["Heat, Fuel, and Oxygen", "Water, Foam, and Powder", "Exit, Alarm, and Assembly", "Red, Blue, and Yellow"], "correct": 0, "explanation": "The fire triangle models the three components required to start and sustain a fire: Heat (ignition source), Fuel (something to burn), and Oxygen (air). Remove one element, and the fire collapses." },
    { "q": "What happens if you remove 'Oxygen' from a fire?", "options": ["The fire goes out", "The fire gets bigger", "Nothing happens", "The fire turns blue"], "correct": 0, "explanation": "Fires require oxygen to fuel the chemical combustion loop. Smothering a fire (using a fire blanket or carbon dioxide) starves the flame of air and extinguishes it." },
    { "q": "Which extinguisher label is CREAM?", "options": ["Foam", "Water", "CO2", "Dry Powder"], "correct": 0, "explanation": "A Cream label or signal banner designates a Foam (AFFF) extinguisher, highly effective for knocking out combustible liquid pools." },
    { "q": "What fire class involves combustible metals?", "options": ["Class D", "Class A", "Class B", "Class C"], "correct": 0, "explanation": "Class D fires involve burning metals, such as magnesium, lithium, sodium, or aluminum shavings. They require specialized dry powder agents to control safely." },
    { "q": "Can you use a foam extinguisher on a wood fire?", "options": ["Yes (Classes A and B)", "No, only liquids", "No, only gas", "Only if it is very small"], "correct": 0, "explanation": "Yes, standard Aqueous Film-Forming Foam (AFFF) extinguishers are rated for both Class A solid materials and Class B liquid risks because the water content cools the fire while the foam element smothers it." },
    { "q": "What should you do first if a fire alarm sounds?", "options": ["Leave via the quickest safe route", "Call your boss", "Pack your tools", "Search for the fire"], "correct": 0, "explanation": "As soon as an alarm sounds, you must drop your tools immediately and exit the site layout through the nearest designated fire escape route to preserve life safety." },
    { "q": "Why are electrical inspections important for fire safety?", "options": ["To spot damaged cables or overloads", "To check the bill", "To see if the lights are bright", "To make tools work faster"], "correct": 0, "explanation": "Routine testing and visual inspections identify fraying insulation wires, loose joints, or overloaded extension blocks before they generate enough heat resistance to spark an insulation fire." },
    { "q": "What does 'Class B' cover?", "options": ["Flammable liquids", "Solid trash", "Burning gas", "Electric motors"], "correct": 0, "explanation": "Class B covers flammable liquids or liquefiable solids, which are highly dynamic hazards often requiring a foam blanket or powder treatment to suppress." },
    { "q": "Why is waste build-up a fire risk?", "options": ["It provides more 'fuel' for a fire", "It is hard to walk over", "It looks messy", "It attracts rats"], "correct": 0, "explanation": "Accumulated construction waste (shavings, cardboard, plastic wraps) provides easily accessible fuel that a wandering spark or discarded cigarette can ignite instantaneously." },
    { "q": "Which extinguisher has no label but a large horn?", "options": ["CO2", "Water", "Foam", "Powder"], "correct": 0, "explanation": "Carbon Dioxide (CO2) units are structurally unique because they lack standard spray nozzles, featuring a large discharge horn instead to allow the gas to expand cleanly without freezing the operator's hands." },
    { "q": "How many attempts should you make to extinguish a fire?", "options": ["One attempt, only if safe", "Until it is out", "None at all", "Three attempts"], "correct": 0, "explanation": "You should only make one single attempt to tackle a localized fire. If the fire fails to respond immediately, or if the space begins to fill with toxic smoke, abort the attempt and evacuate immediately." },
    { "q": "What is the purpose of an assembly point?", "options": ["To conduct a roll call safely", "To have lunch", "To park vehicles", "To store fire extinguishers"], "correct": 0, "explanation": "The assembly point gathers all evacuated personnel into a safe outdoor zone, allowing the fire marshal to perform an accurate roll call check against the site register." },
    { "q": "Which fire class is for 'paper and textiles'?", "options": ["Class A", "Class B", "Class C", "Class D"], "correct": 0, "explanation": "Fires fed by ordinary combustible solids like paper, textiles, timber, fabrics, and plastics fall under the Class A umbrella." },
    { "q": "What is 'Fuel' in the fire triangle?", "options": ["Anything that can burn", "The matches used", "The air around us", "The water used"], "correct": 0, "explanation": "Fuel represents any material—solid, liquid, or gas—that can participate in active chemical oxidation to sustain a visible flame." },
    { "q": "Which sign color marks the assembly point?", "options": ["Green", "Red", "Blue", "Yellow"], "correct": 0, "explanation": "As a safe area designated for first aid and gathering, the fire assembly point marker is always a green and white Safe Condition sign." },
    { "q": "What is a 'Fire Marshal'?", "options": ["A person trained to assist in evacuations", "A firefighter", "The site owner", "A type of extinguisher"], "correct": 0, "explanation": "A Fire Marshal (or Fire Warden) is a designated staff member with advanced training responsible for checking areas, helping people exit orderly, and managing the assembly point roll call." },
    { "q": "Why is it important to know site evacuation routes?", "options": ["To leave the building quickly and safely", "To get to lunch first", "To skip work", "To avoid the manager"], "correct": 0, "explanation": "In thick smoke or a power blackout, finding your way out becomes extremely disorienting. Knowing evacuation pathways beforehand ensures you escape safely without getting trapped." },
    { "q": "Can you use water on a fuel/oil fire?", "options": ["No, it can spread the fire", "Yes, it is the best way", "Only if you mix it with soap", "Only in the winter"], "correct": 0, "explanation": "No. Liquid fuels are lighter than water and float on top of it. Pouring water onto an oil/fuel fire will flash the water to steam, throwing burning liquid across the room and spreading the fire rapidly." }
  ]
}