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A LevelPhysicsOCRExam Questions5. Newtonian World & AstrophysicsThermal Properties of Materials

Thermal Properties of Materials (OCR A Level Physics)

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Thermal Properties of Materials

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Thermal Properties of Materials

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11 mark

The freezing point of ethanol is 159 K.

What is 159 K in °C?

  • – 432 °C

  • – 114 °C

  • 114 °C

  • 432 °C

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21 mark

A solid molecular substance is supplied with energy and it starts to melt.

Which of the following pairs of quantities remains the same as the substance melts?

  • Kinetic energy of molecules and internal energy of molecules.

  • Potential energy of molecules and internal energy of molecules.

  • Kinetic energy of molecules and temperature of substance.

  • Potential energy of molecules and temperature of substance.

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1
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A metal block of mass 0.28 kg has an initial temperature of 82°C. It is dropped into cold water. The temperature of the block after 1.2 minutes is 20°C. The specific heat capacity of the metal is 130 J kg−1K−1.

What is the average thermal power transferred away from the metal block?

  • 31 W

  • 41 W

  • 1900 W

  • 2700 W

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2
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The latent heat of vaporisation of a liquid is 2300 kJ kg−1 and it has a molar mass of 0.018 kg mol−1. What is the energy required to change 30 moles of the liquid to gas?

  • 4.1 × 104 J

  • 1.2 × 106 J

  • 6.9 × 107 J

  • 3.8 × 109 J

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3
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A solid material is heated at a constant rate of P W.

The graph below shows how the temperature of the material θ varies with time t as the solid melts to become a liquid.

5-1-mcq-m-q1-ocr-al-physics

Which of the following statements is correct?

  • The internal energy is constant whilst the substance changes state.

  • The kinetic energy of the molecules increases whilst the substance changes state.

  • The specific heat capacity of the material in liquid state is higher than the specific heat capacity of the material in solid state.

  • The latent heat of fusion of the substance is given by P(t2 - t1).

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4
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A kettle of power 2.1 kW is filled with 3.0 kg water at a temperature of 25 oC

The kettle is switched on.

The specific heat capacity of water is 4200 Jkg-1K-1.

The specific latent heat of vaporisation of water is 2.3 x 106 Jkg-1.

What is the minimum time required to turn all the water into steam?

  • 55 minutes

  • 57 minutes

  • 62 minutes

  • 65 minutes

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