Podcast
Questions and Answers
What temperature does water boil at in degrees Celsius?
What temperature does water boil at in degrees Celsius?
- 80°C
- 90°C
- 120°C
- 100°C (correct)
Which of the following statements best describes the molecular behavior of a substance transitioning from liquid to gas?
Which of the following statements best describes the molecular behavior of a substance transitioning from liquid to gas?
- Molecules move further apart. (correct)
- Molecules lose kinetic energy.
- Molecules move in a circular motion.
- Molecules move closer together.
To provide a minimum pressure of 0.7 Bar, how high must a cold water cistern be located?
To provide a minimum pressure of 0.7 Bar, how high must a cold water cistern be located?
- 3.5 metres
- 10.0 metres
- 5.0 metres
- 7.0 metres (correct)
Which calculation gives the correct intensity of pressure of water at the base of closed tank B?
Which calculation gives the correct intensity of pressure of water at the base of closed tank B?
What factor most significantly influences frictional resistance in a cold water pipework system?
What factor most significantly influences frictional resistance in a cold water pipework system?
Which domestic appliance operates based on the principle of siphonage?
Which domestic appliance operates based on the principle of siphonage?
Which device is most suitable for measuring temperature within a thermostatic radiator valve?
Which device is most suitable for measuring temperature within a thermostatic radiator valve?
What is the specific heat value for water based on heating 1 kg of water by 2°C using 8.372 kJ?
What is the specific heat value for water based on heating 1 kg of water by 2°C using 8.372 kJ?
What type of current is generated when a magnet is moved around a copper wire wound on a soft iron core?
What type of current is generated when a magnet is moved around a copper wire wound on a soft iron core?
Which domestic appliance operates based on the principle that uses changes in pressure to move water?
Which domestic appliance operates based on the principle that uses changes in pressure to move water?
What is the SI unit for measuring electric current?
What is the SI unit for measuring electric current?
Which of the following metals is classified as ferrous?
Which of the following metals is classified as ferrous?
What is the most significant factor affecting frictional resistance in a cold water pipework system?
What is the most significant factor affecting frictional resistance in a cold water pipework system?
When water is sourced from limestone and chalk bedrock, what is the expected pH level?
When water is sourced from limestone and chalk bedrock, what is the expected pH level?
What type of device is typically used for measuring temperature in a thermostatic radiator valve?
What type of device is typically used for measuring temperature in a thermostatic radiator valve?
Which of the following best describes how heat is transferred by convection?
Which of the following best describes how heat is transferred by convection?
Flashcards
Boiling Point of Water
Boiling Point of Water
The temperature at which water changes from a liquid to a gas.
Liquid to Gas State Change
Liquid to Gas State Change
The molecules move further apart, increasing the distance between them.
Water Pressure
Water Pressure
The pressure exerted by a column of water due to its weight and height.
Intensity of Pressure
Intensity of Pressure
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Specific Heat Value
Specific Heat Value
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Heat Transfer by Convection
Heat Transfer by Convection
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Patina
Patina
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Ampere (Amp)
Ampere (Amp)
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Pressure Head
Pressure Head
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Double Trap WC
Double Trap WC
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Fuse
Fuse
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Convection
Convection
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Study Notes
Scientific Principles Mock 3 - Study Notes
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Boiling Point of Water: Water boils at 100°C.
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State Change (Liquid to Gas): When a substance changes from liquid to gas, its molecules move further apart.
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Water Heater Pressure: An instantaneous water heater needs a minimum pressure of 0.7 bar. A cold water cistern needs to be 7.0 meters high to supply this pressure.
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Pressure Intensity (Tank B): The intensity of water pressure at the base of tank B is calculated by multiplying the height (3m), width (1.5m), depth (1m) , and acceleration due to gravity (9.81 kN/m²). The correct calculation is 3 m X 1.5 m X 1 m X 9.81 kN/m².
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Pipework Friction: The pipe material's thickness does not significantly impact friction resistance in a cold water pipework system. The number of bends (elbows) significantly impacts friction.
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Siphonage: A double trap WC uses the principle of siphonage.
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Temperature Measurement: A spirit thermometer/alcohol thermometer is suitable for use in thermostatic radiator valves.
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Specific Heat of Water: The specific heat value for water is 4.186 kJ/kg/°C.
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Convection Heat Transfer: Heat transfer by convection involves the movement of a fluid (liquid or gas).
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Water Hardness & Boiler Scale: Hard water scale in boilers has an insulating effect, wasting fuel and overheating.
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Electrolytic Corrosion: Electrolytic corrosion is greatest when unlike metals (e.g., iron and zinc, or copper and aluminium) are placed together in an electrolyte.
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Lead Sheeting Groove: Groove A in overlapped lead sheeting is designed to prevent water leakage due to excessive run-off.
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Fuse Size Calculation (Formula): Fuse size (amps) is calculated with the formula I = V/R, where I is current (amps), V is voltage (volts), and R is resistance (ohms).
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Ferrous Metal: Steel is a ferrous metal.
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Atmospheric Protection Layer: A protective barrier (patina) forms on copper and lead when exposed to the atmosphere.
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SI Unit of Current: The SI unit for current is the Ampere (Amp).
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Fuse for Lighting Circuit: A 15-amp fuse is typically used to protect lighting circuits at a consumer unit.
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Electromagnetic Induction: Passing a magnet over copper wire wrapped around soft iron generates alternating current.
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