AQA Physics unit 3 questions

Some physics question for unit 3 for the AQA exam board including answers. Hope it helps =)

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Physics 3
Question 14
3.1 Medical applications of physics
The diagram shows the basic structure of an eye.
(a) Light entering the eye is refracted by the eye lens.
(i) What happens to light rays that are refracted? (1 mark)
(ii) For a person with perfect vision, where in the eye is the light refracted by
the eye lens brought to a focus? (1 mark)
(iii) The eye is able to focus on both near and distant objects. Explain how it is
able to do this. (4 marks)
(iv) Name the other part of the eye that also refracts light? (1 mark)
(b) A student has poor eyesight and needs to wear a pair of glasses. Each of the
lenses used in the glasses has a power of ­2.5 D.
(i) Does the student have long sight or short sight?
Give a reason for your answer. (1 mark)
(ii) What eye defect may be causing the student's poor eyesight? (1 mark)
(iii) Calculate the focal length, in metres, of the lenses used in the glasses.
Write down the equation you need to use and show how you work out your
answer. (2 marks)
1
© Steve Witney 2011
Philip Allan Updates

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Question 15
3.1 Medical applications of physics
(a) Ultrasound is a sound wave with a frequency above the upper limit of human
hearing. What is the maximum frequency that a person can hear? (1 mark)
(b) What type of wave are Xrays? (1 mark)
(c) Both Xrays and ultrasound are used by doctors to help diagnose illness.
(i) Explain why, before having an Xray taken, all metal jewellery should be
removed.…read more

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Question 16
3.1 Medical applications of physics
A student investigates the refraction of light as it passes out from a glass block into
the air.
Each time the student changes the angle of incidence (i) in the glass block he
measures the angle of refraction (r) in the air. The student's results are given in the
table.…read more

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Question 17
3.1 Medical applications of physics
(a) The diagram shows an object 3 cm in front of a converging lens of focal length
6 cm.
(i) Complete a ray diagram to show the position of the image. (4 marks)
(ii) How can you tell from the completed ray diagram that the image formed is
virtual? (1 mark)
(iii) Calculate the magnification produced by the lens.
Write down the equation you need to use and show how you work out your
answer.…read more

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Question 18
3.2 Using physics to make things work
The diagram shows a mobile crane. The tower is raised and lowered hydraulically.
(a) What two properties of a liquid are used by a hydraulic machine? (2 marks)
(b) The clockwise moment about point P, caused by the weight W, is 8 106 Nm.
Calculate, in newtons, the size of the weight W.
Write down the equation you need to use and show how you work out your
answer.…read more

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Question 19
3.2 Using physics to make things work
(a) The diagram shows a simple pendulum at one point in an oscillation (swing).
(i) Draw a cross ( ) on the diagram so that the centre of the cross marks the
position of the centre of mass of the pendulum bob. (1 mark)
(ii) Draw a circle on the diagram to show the position of the pendulum bob once
the pendulum stops swinging.
Give a reason for your choice of position.…read more

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Question 20
3.3 Keeping things moving
Diagram 1 shows a thin strip of aluminium foil held between the poles of a strong
magnet.
Diagram 1
(a) When the switch is closed the aluminium foil moves. Explain why. (3 marks)
(b) The direction in which the wire moves can be predicted using Fleming's
lefthand rule.…read more

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Diagram 3 shows the crosssection through a loudspeaker.
Diagram 3
Explain how the alternating current input from the amplifier causes the
loudspeaker cone to vibrate.…read more

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Answer 14
(a) (i) The light rays change direction.
Change
dir
ect
ion
is
suf
fi
ci
ent
f
or
the
mar
k
(ii) At the retina
Remember
t
hat
t
he
ret
ina
is
w her
e t
he
image
in
the
eye
is
for
med
.
(iii) To focus on near objects the ciliary muscle contracts, making the suspensory
ligaments slack. The eye lens becomes fatter and more powerful.…read more

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Answer 15
(a) 20 000 Hz
Al
though
thi
s quest
ion
onl
y asked
for
t
he upper
l
imit
of
human hear
ing
you
need
t
o r
eme mber
that
t
he
compl
e t
e r
ange goes
fr
om 2 0
H z
to
20
000 Hz
.
(b) Electromagnetic waves
X r
ays
are
at
the
highfr
equency
end
of
the
elect
romagnet
ic
spect
ru
m.…read more

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