Exam Questions

Question 1

Which is ionising: x rays or ultrasound

Answer 1

X rays

Question 2

How could a student measure the magnetic field of a bar magnet

Answer 2

Place a compass at the North Pole
Mark where the arrow points
Move the compass, marking where the arrow points at regular intervals, to the South Pole.
Join up the points and add an arrow going from north to south

Question 3

Describe what will happen to a star between the main sequence star and the end of a stars life cycle

Answer 3

Star will expand to become a red giant
Collapse to become a white dwarf
Cool to become a black dwarf

Question 4

Describe life cycle of a star much bigger than our sun after the main sequence stage

Answer 4

The core of the star will run our of hydrogen to fuse to helium
Star expands to form a red super giant. The outer layers explode and the star begins to fuse heavier elements up to iron
Then becomes a supernova where elements heavier than iron are formed
The core shrinks to become a neutron star. If the mass of the star is large enough, the core will collapse to form a black hole