2019 paper 1

Question 1

why should light bulbs be labelled with the rate at which they transfer visible light

Answer 1

bulbs also transfer thermal energy and efficiency needs to be considered

Question 1

describe how when electric cars are not being driven, energy stored in their batteries could be used
to meet sudden peaks in electricity demand.

Answer 1

their energy could be transferred to the national grid

Question 2

explain why as the person moves down the zip wire their increase in knetic energy is less than decrease of gravitational energy

Answer 2

work done against friction causes some kinetic energy to be transferred as thermal energy

Question 3

explain why alpha radiation in a persons body is bad

Answer 3

alpha is extremely ionizing so it can cause cancer and damagae body cells untill alpha radiation is removed from body

Question 4

how to solve a zero reading error after your measurements have been taken

Answer 4

measure the mass of balance with nothing on it and subtract from value