2022 paper 1

Question 1

Explain what happens to a parallel circuit when all switches are closed at same time

Answer 1

Total resistance of circuit decreases which increases current wich then increases power output

Question 2

What units should length be in

Answer 2

M
NOT cm

Question 3

Some thermal energy was transferred to the surroundings while the water was being heated. Explain this affect on specific latent heat of vaporisation

Answer 3

Less energy was transferred to the water so students value of latent heat was too high

Question 4

Some water evaporated before it reached 100c. Explain how this affects students value for specific latent heat of vaporisation

Answer 4

Change in mass is too high so students value of latent heat is too low

Question 5

What can alpha be absorbed by

Answer 5

Skin (and paper)

Question 6

What does step down transformer do

Answer 6

Decreases potential difference for a safe value

Question 7

Wich is better for insulating house materials: low or high thermal conductivity

Answer 7

Low thermal conductivity - less energy transferred by conduction