P2.1 Examination Question – 8 Marks, 8 Minutes – Mark scheme included
Q1.
Using static electricity
Waste gases contain smoke particles.
The diagram shows how smoke particles can be removed from waste gases as they rise
through a chimney.
(a) Complete the sentence by putting a cross ( ) in the box next to your answer.
When the smoke particles go through the metal grid they become negatively charged.
This is because they
(1)
A gain electrons
B gain protons
C lose electrons
D lose protons
(b) When the negatively charged smoke particles move up the chimney, they are
attracted to the metal plates.
(i) State why the metal plates attract the smoke particles.
P2.1 Examination Question – 8 Marks, 8 Minutes – Mark scheme included
(1)
..............................................................................................................................................
..............................................................................................................................................
(ii) State what happens to the charge on the smoke particles when they reach the
metal plate.
(1)
..............................................................................................................................................
(c) There is a current of 1.4 A between the grid and the plates.
(i) Calculate the charge transferred by this current in two minutes. State the unit.
(3)
charge = ........................................ unit ........................................
(ii) The potential difference between the grid and the plate is 400 V.
Calculate the electrical energy transferred in two minutes.
(2)
energy transferred = ....................................... joules
Q1.
Answer
Question Number
(a)
Question Number
(b)(i)
Question Number
(b)(ii)
Question Number
Acceptable
answers
A
Mark
(1)
Answer
Acceptable
answers
Any one from the
following points
• positive and
negative charges
attract • plates
are positive (1)
Answer
(1)
Acceptable
answers
smoke particles
lose their charge
/ become neutral
Answer
Mark
Mark
(1)
Acceptable
answers
Mark
P2.1 Examination Question – 8 Marks, 8 Minutes – Mark scheme included
(c)(i)
Question Number
(c)(ii)
substitution (1)
1.4 × 60 × 2
evaluation (1) =
168 unit (1)
coulombs / C
Answer
substitution (1)
1.4 × 400 × 60 × 2
evaluation(1) 67
200 (J)
give full marks for
correct answer
with correct unit,
no working
(3)
Acceptable
answers
give full marks for
correct answer,
no working
(2)
Mark