review one

Question 1

two differences between orbits mercury and the earth

Answer 1

orbits speed

orbital paths

Question 2

There is a large insulated coil of wire inside the kettle.

Explain why this coil of wire gets hot when the kettle is switched on.

Answer 2

MP1. there is a current in
the coil / wire;
MP2. coil / wire has resistance;
MP3. electrical energy transferred to thermal energy;

Question 3

Describe an experiment to determine the refractive index of a glass block.

Answer 3

MP1. suitable named light source;
MP2. ruler / pencil / paper;
MP3. protractor;
measurements needed (2 marks max.)
MP4. measure angle of
incidence / angle of
refraction;
MP5. repeat for different
angle(s) of incidence;
MP6. repeat for same angle
of incidence;
data analysis (2 marks max.)
MP7. (use equation to)
calculate n;
MP8. plot a graph of sin i
against sin r;
MP9. calculate n from
gradient / calculate average value of n;

Question 4

The cable connecting the mobile phone to the adaptor is changed for a much longer cable of the same type.

Answer 4

time (to charge fully) increases;
current reduces;
(because) resistance of cable has increased

Question 5

Suggest why the reading on the ultraviolet meter remains the same for the
last three readings

Answer 5

change is too small to measure

Question 6

absorbs a neutron

Answer 6

1 - o + element > 1-1

Question 7

State why the scientist has to correct the activities.

Answer 7

background radiation

Question 8

State why the scientist takes samples of the same mass

Answer 8

the activity depends on the mass

Question 9

what is conduction simple meaning sentence

Answer 9

energy is transferred by

particle vibration;

Question 10

Explain why the ice remains frozen when the top of the tube is heated

Answer 10

any two from:
MP1. energy is not transferred to
ice;
MP2. (because) little conduction
in liquids / glass;
MP3. hot water stays at top (of
test tube);
MP4. (because) it is less dense;