Scientific Principles Mock 2

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Questions and Answers

Which metal listed has the highest rate of heat conductivity?

  • Copper (correct)
  • Steel
  • Iron
  • Lead

What is the proper fuse rating for a 600 watt appliance on a 220 volt supply?

  • 13 amp
  • 3 amp
  • 1 amp
  • 6 amp (correct)

What is relative density?

  • Density of a substance divided by its volume
  • Force exerted by the density of a substance
  • Density of water displaced when a substance is placed in water
  • Density of a substance in comparison to the density of water (correct)

Which metal requires treatment to prevent atmospheric corrosion?

<p>Iron (B)</p> Signup and view all the answers

During electrolytic action, what will gradually destroy the anode?

<p>The cathode (C)</p> Signup and view all the answers

At what temperature does water freeze?

<p>0°C (B)</p> Signup and view all the answers

Water reaches its maximum density at which temperature?

<p>4°C (C)</p> Signup and view all the answers

What is the approximate pressure at a tap if the head of water above it is 3.0 metres?

<p>1.0 Bar (A)</p> Signup and view all the answers

Which of the following materials offers the greatest resistance to water flow?

<p>Grade Z copper (C)</p> Signup and view all the answers

What is the heat energy required to heat 1 kg of copper by 2°C?

<p>0.77 kJ (A)</p> Signup and view all the answers

Which process involves atmospheric pressure for movement?

<p>Siphonage (C)</p> Signup and view all the answers

What describes the transfer of heat by radiation most accurately?

<p>Heat transfer to a body in straight lines (B)</p> Signup and view all the answers

What directly causes permanent hardness in water?

<p>Dissolution of calcium sulphate (A)</p> Signup and view all the answers

Which metal listed is commonly treated to prevent corrosion from atmospheric exposure?

<p>Iron (A)</p> Signup and view all the answers

What is the maximum amp rating for socket outlets in a typical domestic setting?

<p>13 amps (B)</p> Signup and view all the answers

During what condition is it recommended for a plumber to utilize temporary earth continuity bonds?

<p>Flushing a domestic hot water system (B)</p> Signup and view all the answers

What is the electrical current drawn by a 600 watt appliance connected to a 220 volt supply, rounded to the nearest amp?

<p>3 amps (B)</p> Signup and view all the answers

Which of the following tubes would exhibit the least capillary attraction?

<p>Wide tube (A)</p> Signup and view all the answers

At what temperature does water reach its maximum density?

<p>4°C (D)</p> Signup and view all the answers

What causes permanent hardness in water?

<p>Dissolving calcium sulphate (A)</p> Signup and view all the answers

Which measurement device is most suitable for assessing the temperature in a heating system's pipework?

<p>Bimetallic strip (B)</p> Signup and view all the answers

The effective transfer of heat energy by radiation primarily occurs through which medium?

<p>Empty space (A)</p> Signup and view all the answers

Which characteristic of hard water can lead to reduced efficiency in domestic systems?

<p>Scaling in appliances (D)</p> Signup and view all the answers

What is the primary principle behind the process of siphonage?

<p>Hydraulic principles and pressure differences (C)</p> Signup and view all the answers

Which type of pipe material is most likely to exhibit the least resistance to water flow?

<p>PVC-U (B)</p> Signup and view all the answers

What heat energy is required to increase the temperature of 1 kg of copper by 2°C given its specific heat capacity?

<p>0.77 kJ (D)</p> Signup and view all the answers

Flashcards

Capillary attraction

The force of attraction between a liquid and a solid surface, causing the liquid to rise or form a meniscus.

Relative density

The ratio of the density of a substance to the density of water at a specific temperature.

Heat conductivity

The ability of a material to transfer heat energy.

Atmospheric corrosion

The process of a material being corroded by the atmosphere, typically from the presence of oxygen and moisture.

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Electrolytic action

The process of using an electric current to break down a substance into its components.

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Water's freezing point

The temperature at which water transitions from a liquid to a solid state.

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Water's maximum density

The temperature at which water reaches its highest density.

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Water pressure

The force exerted by a column of water, calculated as the product of the density of water, the acceleration due to gravity, and the height of the water column.

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Siphonage

The movement of a fluid from a higher elevation to a lower elevation through a pipe, driven by the pressure difference between the two points.

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Water flow resistance

The resistance of a material to the flow of water.

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Specific heat capacity

The amount of heat energy required to raise the temperature of 1 kilogram of a substance by 1 degree Celsius.

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Water hardness

The mineral content in water, particularly calcium and magnesium ions.

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Which tube has the greatest capillary attraction?

The strength of capillary attraction is directly related to the diameter of the tube. Narrower tubes experience stronger capillary attraction due to a greater surface area of contact between the liquid and the tube's walls.

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What is relative density?

Relative density is a comparison of the density of a substance to the density of water at a specific temperature. It tells us how much denser or less dense a substance is compared to water.

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Which metal has the best heat conductivity?

Copper is known for its excellent heat conductivity, meaning it readily transfers heat energy from one point to another.

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Which metal needs protection from atmospheric corrosion?

Galvanized steel is protected from atmospheric corrosion by a zinc coating. The zinc acts as a sacrificial metal, corroding in place of the steel.

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What happens to the anode during electrolytic action?

During electrolytic action, the cathode (negative electrode) is where reduction occurs, resulting in the gain of electrons. This process can lead to the gradual destruction of the anode (positive electrode).

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Study Notes

Scientific Principles Mock 2 - Study Notes

  • Question 1: Water freezes at 0°C.

  • Question 2: Water reaches its maximum density at 4°C.

  • Question 3: The approximate pressure at a tap 3.0 metres above the water source is 0.3 Bar.

  • Question 4: Water pressure is greatest at hole A in Figure 1.

  • Question 5: Galvanised LCS pipe material offers the greatest resistance to water flow.

  • Question 6: Siphonage utilises atmospheric pressure.

  • Question 7: A bimetallic strip should be used to measure the temperature of flow and return pipework in a heating system.

  • Question 8: 0.77 kJ of heat energy is needed to heat 1 kg of copper by 2°C. (Specific heat capacity of copper is 0.385 kJ/kg °C).

  • Question 9: Heat is transferred by radiation in straight lines.

  • Question 10: Permanent hardness in water is caused by the solvent ability of water to dissolve calcium sulphate.

  • Question 11: The direct result of hard water in domestic properties is reduced system efficiency.

  • Question 12: The effect of electrolytic action on a metal depends on its position in the electromotive series.

  • Question 13: Capillary attraction is greatest in tube A in Figure 2.

  • Question 14: Relative density is the density of a substance in comparison to the density of water.

  • Question 15: Copper has the highest rate of heat conductivity.

  • Question 16: Iron needs treatment if exposed to atmospheric corrosion.

  • Question 17: During electrolytic action the cathode is gradually destroyed.

  • Question 18: The fuse rating for a 600-watt appliance on a 220-volt supply is approximately 2.73 amps (calculated: 600W / 220V = 2.73A).

  • Question 19: Socket outlets in a domestic property usually have a maximum amp rating of 13 amps.

  • Question 20: Temporary earth continuity bonds would be most appropriate for a plumber during tasks like flushing a domestic hot water system, or working on a central heating control panel, or changing a cold water tap washer, or removing a section of system pipework.

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