EXAM

Question 1

Explain 1 disadvantage caused by solar cells only facing one direction.

Answer 1

Solar cells don’t track the sun and won’t generate as much electricity.

Question 2

When ball hit ground, energy is transferred from ball to earht. Explain the energy transfer.

Answer 2

Velocity after bounce is decreased, with the loss of kinetic energy. Means the ball has lost its energy as height from top of bounce is less than height dropped.

Question 3

nuclear fusion is the joining together of …..
during nuclear fusion the totoal mass of the particles….

Answer 3

nuclei, decrease

Question 4

Why were modeles tested befre starting to build?

Answer 4

To devlop understanding of process and to assess safety risk.

Question 5

Explain 1 environmental effetc of genertaing electricity using fossil fuel

Answer 5

realses carbon dioxide which causes global warming.

Question 6

Explain the effect of 2 other factors on braking distance of car. ( no speed include)

Answer 6

Braking distance of car can be effected due to, poor road surface as wet or icy road, amking the poor condiiton on tyres to be worn brakes. This is because decreased fricitin as it slows tyres to brake.

Question 7

When rider reach bottom of slide, sled decerlates and stop. Give 2 factors that affect how far the sled will move before it stops.

Answer 7

Speed at bottom of slide and fricition between sled and ground.

Question 8

LED lamps are much more effcient than filament lamp means?

Answer 8

LED lamp waste a smller proportion of input energy than filament lamp.

Question 9

Why might filamenet inside a lamp melt when the lamp is first switched on?

Answer 9

The current goes too high.

Question 10

Connecting 2 reisotrs in parall circuit, what happen to total resistance of circuit

Answer 10

Decrease because totoal resistance is always less than smallest indiivudal resistance.

Question 11

Describe how to measure the volume of peice of rock.

Answer 11

1. Fill displacement can with water
2. Water levl with spout
3. Place object in water
4. Collect displaced water
5. Measuring cyclinder use to determine volume of displace water.

Question 12

2 envirnemntal issue caused be genertaing electricty using nuclear power ststaion

Answer 12

Waste is radioactive and is toxtic

Question 13

why can parallel circuit operate wither 2 swithc

Answer 13

because switch in parallel so closiing either switch completes the circuit.

Question 14

why the fricition between sock and carpet make studen charge

Answer 14

transfer of electrons fro the carpet to the student.

Question 15

Negative charge student touch a metal tap and recive electric show why

Answer 15

because there is P.D between student and the tap which causes charge to transfer from the stuent.

Question 16

expain one envuronemntal problem cause when electrictty is generated by buring coal

Answer 16

greenhouse effect air poluution is insufficent.

Question 17

why did studetn insulate beaker of water in specific heat coaicty experinent.

Answer 17

to reduce energy trasfer to the surroduniing

Question 18

describe method student could use to ontain the result of insulating properties of newspaper experiment

Answer 18

1. wrap layers of newspaper around metal can
2. heat water in kettle.
3. pour hot water in metal cna
4. use measuing cyclinder to mesure hte volume of water
5. measure intial + final tempt with digtal thermoter
6. use stopclock measure a time for 5 mins.
7. calaculate tempt decrease
8. Repeat with different number of layes of newspaper.
9. repet with no layer
10. use same intital tempt of hot water and same volume of water each tuime.

Question 19

rider reach bottom of slide, sled declertaes and stop, 2 reason that affect how far the sled will move before it stops.

Answer 19

speed at bottom of slide and friciton between sled and ground.

Question 20

the cells were put into torch the wrong way round, why the troch didnt work

Answer 20

there is no current in diode inthe revser direcetion because has very high resistance in reverse direction

Question 21

describe use equipment on syringe and pressure gauge to obtain data

Answer 21

1. record intial volume of air
2. record the intial pressure
3. push the plunger of syringe to decrease volume of air
4. read nd record new wavlue of pressure guage and volume
5. rpet for different vlumes

Question 22

describe method student on investigate how quickly kettle could increase the tempt of water

Answer 22

1. measure mass of water use balance
2. measure inital tempt of water use thermoter
3. pour water into kettle
4. place thermoter in water]
5. switch kettle on
6. take recording of tempt of water every 5secon
7. record with stopclosk

Question 23

for safety, it is important that the bungee cord used is appropiate for students weight, why?

Answer 23

bungee rope may snap and extend too much

Question 24

Explain what led to the plum pudding model of the atom being replaced by the nuclear model of atom

Answer 24

The alpha particle scattering experiment have led changes as alpha particle directed at gold foil. Most of alpha particles pas staright through so msot of atom is empty space. Plum pudding model has mass spread throughout atom and change spread.