P2 Energy transfer by heating

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Types of heat transfer

Internal energy and specific heat capacity

What is a thermal conductor? *

A material that easily allows thermal energy through

A material that will not allow thermal energy through

A material with a low conductivity

Which of the following materials is the best conductor? *

wood

glass

copper

steel

Which of the following best describes specific heat capacity? *

the energy needed to raise the temperature of 1 kg of a substance by 1 °C.

the energy needed to raise the temperature of 1 g of a substance by 1 °C.

the energy needed to raise the temperature of 1 kg of a substance by 100 °C.

the power needed to raise the temperature of 1 kg of a substance by 1 °C.

Which method of insulating your home works by putting a gap between hot and cold regions? *

thick carpets

aluminium foil behind radiators

double glazing

loft insulation

6.3 kJ of energy is required to increase the temperature of some water from 60 °C to 75 °C. The specific heat capacity of water is 4200 J per kg per °C. What is the mass of the water? *

1kg

0.1kg

0.02kg

0.0001 kg

4 Which of the following statements about infrared radiation is correct? *

The higher the temperature of an object, the less infrared radiation it emits in a given time.

All objects emit the same amount of infrared radiation in a given time.

The lower the temperature of an object, the more infrared radiation it emits in a given time.

The higher the temperature of an object, the more infrared radiation it emits in a given time.

Which of these are greenhouse gases? *

water vapour, carbon dioxide and methane

methane only

methane and carbon dioxide

carbon dioxide only

Which type of surface would emit the least infrared radiation? *

light-coloured matt surface

dark-coloured matt surface

dark-coloured shiny surface

light-coloured shiny surface

Some water is being heated. What factors could you change to increase the temperature change in a given time? *

decrease the amount of energy transferred to the system and increase the mass of water

increase the amount of energy transferred to the system and decrease the mass of water

increase the specific heat capacity of the water

increase the specific heat capacity of the water and increase the amount of energy transferred to the system

he table gives the specific heat capacity of four different materials. Which material would be most suitable to use for loft insulation? *

the specific heat capacity of water is 4200 J per kg per °C. Which of the following will result in the smallest transfer of energy to the thermal store? *

raising the temperature of a kettle of water containing 0.5 kg of water by 100 °C

raising the temperature of a bath tub containing 300 kg of water by 2 °C

raising the temperature of a cup of water containing 200 g of water by 40 °C

raising the temperature of a cup of water containing 100 g of water by 100 °C

You heat three rods with a Bunsen burner. The rods have wax on the end. Choose the correct statement below. *

The rod which has the wax that melts first is the best insulator.

It takes longest for the wax to melt on the rod with the highest thermal conductivity.

The thermal conductivity of the rod which has the wax that melts last has the highest thermal conductivity.

The rods need to be the same thickness and length, and heated by the same Bunsen burner if you want to compare thermal conductivities.

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