GCSE Energy (Physics Paper 1) 2

Question 1

What does the specific heat capacity of a substance tell you?

Accepted Answer

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

Answer

Specific heat capacity is the energy required to raise the temperature of 1 kg of a substance by 1 °C, measured in J/kg °C.

Question 2

How much energy is needed to raise the temperature of 0.5 kg of water from 20 °C to 60 °C? (Specific heat capacity of water = 4200 J/kg °C)

Accepted Answer

84,000 J

Answer

ΔE = m c Δθ = 0.5 × 4200 × (60 − 20) = 0.5 × 4200 × 40 = 84,000 J.

Question 3

Which statement about the principle of conservation of energy is correct?

Accepted Answer

Energy can be transferred usefully, stored or dissipated, but cannot be created or destroyed

Answer

Energy is conserved: the total energy in a closed system stays the same, it is only transferred between stores or dissipated.

Question 4

Which of these changes would reduce the rate of thermal energy transfer from a house?

Accepted Answer

Installing loft insulation with a low thermal conductivity

Answer

Insulation with a low thermal conductivity slows the rate at which energy is conducted out of the building.

Question 5

A spring with a spring constant of 200 N/m is stretched by 0.1 m. How much elastic potential energy is stored?

Accepted Answer

1 J

Answer

Ee = ½ k e² = 0.5 × 200 × 0.1² = 0.5 × 200 × 0.01 = 1 J.

GCSE - General Certificate of Secondary Education Practice Test