The salt concentration (measured as salinity in parts per thousan

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 Multiple Choice QuestionsMultiple Choice Questions

241.

Energy in the form of heat is wasted when a machine is operated. This heat is generated due to ___________.

  • burning

  • friction

  • combustion

  • lubrication


242.

Acetic Acid is another name for which of the following?

  • Vinegar

  • Baking Soda

  • Copper Sulphate

  • Magnesium Oxide


243.

A ......... thread is actually stronger than a steel wire.

  • wool

  • cotton

  • jute

  • nylon


244.

The process of depositing a layer of any desired metal on another metal by means of electricity is called ...........

  • Electroplating

  • Galvanisation

  • Rusting

  • Crystallisation


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245.

The salt concentration (measured as salinity in parts per thousand), is..........% in sea.

  • 10-20

  • 30-35

  • 40-50

  • 60-70


B.

30-35


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246.

A change in which one or more new substances are formed is called .................

  • Physical Change

  • Chemical Change

  • Rusting

  • Galvanisation


247.

The property of metals by which they can be beaten into thin sheets is called ................

  • ductility

  • malleability

  • viscosity

  • tensile strength


248.

The salt concentration (measured as salinity in parts per thousand), is greater than .............% in hypersaline lagoons.

  • 50

  • 100

  • 150

  • 200


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249.

The temperature at which a solid melts to become a liquid at atmospheric pressure is called..........

  • crystallisation

  • melting point

  • evaporation

  • galvanisation


250.

The melting point of ice is ............K.

  • 253.16

  • 263.16

  • 273.16

  • 283.16


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