Physics Class Quiz: Fluid Mechanics and Materials
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Questions and Answers

What does the pH value of water indicate?

  • Its heat conductivity.
  • Its degree of acidity or alkalinity. (correct)
  • The amount of heat it contains.
  • Its electrical conductivity.

    • Under what temperature condition do carbonates typically deposit on pipe walls?

  • Warm temperature.
  • Cool temperature.
  • Ambient temperature.
  • Hot temperature. (correct)

    • Why is magnesium placed in a hot water storage cylinder?

  • To prevent hardness in water.
  • To reduce corrosion of the cylinder. (correct)
  • To stop bacteriological action.
  • To counter soldering flux effects.

    • Capillarity between two surfaces occurs under which conditions?

    <p>When surfaces are in a horizontal or vertical position.</p> Signup and view all the answers

    Calculate the heat required to raise 5 kg of water from 10°C to 65°C using its specific heat capacity.

    <p>1151 kJ.</p> Signup and view all the answers

    Which of the following lists only non-ferrous metals?

    <p>Aluminum, Copper, Zinc</p> Signup and view all the answers

    At which temperature does water achieve its highest density?

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

    Which one of the following materials has the highest coefficient of linear expansion?

    <p>UPVC</p> Signup and view all the answers

    Corrosion by electrolytic action would be most likely to occur where?

    <p>Copper filings are left in a galvanized steel cistern</p> Signup and view all the answers

    What would be the weight of a cubic metre of copper, given its relative density?

    <p>8900 kg</p> Signup and view all the answers

    Which one of the following is the unit of power?

    <p>Watt (kilowatt)</p> Signup and view all the answers

    To calculate pressure in Pascals, which of the following measurements should be multiplied?

    <p>Newtons (N) and square metres (m²)</p> Signup and view all the answers

    If the head of water above a shower fitting is one metre, what approximate pressure will be experienced at the shower?

    <p>0.1 Bar</p> Signup and view all the answers

    What type of electric current will be produced when a zinc plate and a copper plate are immersed in an acidic solution connected by a wire?

    <p>Direct</p> Signup and view all the answers

    Which configuration of pipes will present the highest resistance to water flow?

    <p>15 mm copper pipe with 6 elbows fitted</p> Signup and view all the answers

    Siphonage will occur when a specific pressure condition is met at point B. What is the required condition?

    <p>A negative pressure is maintained at point B</p> Signup and view all the answers

    Which device is most suitable for measuring the temperature difference in two central heating pipes?

    <p>Clip on thermometers</p> Signup and view all the answers

    What defines the Specific Heat Capacity of a substance?

    <p>Energy required to raise the temperature of 1 kg of a substance through 1°C</p> Signup and view all the answers

    Convection is primarily driven by which phenomenon?

    <p>Density variations in liquids and gases</p> Signup and view all the answers

    Which of the following describes a condition that would NOT facilitate siphonage?

    <p>Introducing equal atmospheric pressure at both points</p> Signup and view all the answers

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