GCSE AQA Physics Unit 3

Gabi Germain
Quiz by Gabi Germain, updated more than 1 year ago
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Description

P3: - Medical applications of physics - Using physics to make things work - Keeping things moving

Resource summary

Question 1

Question
Ultrasound waves are partially ________ when they meet a boundary between two different media.
Answer
  • Refracted
  • Reflected

Question 2

Question
Ultrasound wave facts:
Answer
  • Can be produced by electronic systems
  • Have a frequency lower than 20000Hz
  • Have a frequency higher than 20000Hz
  • An electromagnetic wave beyond the red end of the visible spectrum
  • An electromagnetic wave beyond the blue end of the visible spectrum

Question 3

Question
X-rays have a very short wave length and cause ionisation
Answer
  • True
  • False

Question 4

Question
X-rays can't be used to diagnose and treat medical conditions
Answer
  • True
  • False

Question 5

Question
Properties of X-rays:
Answer
  • absorbed by metal and bone
  • transmitted by soft tissue
  • reflected by soft tissue
  • doesn't effect photographic film in the same way as light
  • effects photographic film in the same way as light

Question 6

Question
What is refraction?
Answer
  • change of direction of light as it passes from one medium to another
  • change of direction of sound waves as they pass from one medium to another

Question 7

Question
A lens forms an image by refracting light
Answer
  • True
  • False

Question 8

Question
how is the nature of an image defined:
Answer
  • Size relative to the object
  • If the light rays cross
  • Real or virtual
  • Upright or inverted
  • Distance from focal length

Question 9

Question
Which lens is used in a magnifying glass?
Answer
  • Converging
  • Diverging

Question 10

Question
Visible light can be sent along optical fibres
Answer
  • True
  • False

Question 11

Question
What is long sight caused by?
Answer
  • Eyeball being too short
  • Eyeball being to long
  • The lens is too weak
  • The lens is too strong

Question 12

Question
Where can the eye focus on objects?
Answer
  • Between the principal focus and the far point
  • Between the near point and the far point
  • Between the near point and the principal focus

Question 13

Question
The power of a lens is given by P=1/f
Answer
  • True
  • False

Question 14

Question
The greater the refractive index
Answer
  • The flatter the lens
  • The thicker the lens

Question 15

Question
What does a camera lens and the eye have in common?
Answer
  • The CCDs in a digital camera is the equivalent of the retina
  • They are both diverging lens'
  • They are both converging lens'

Question 16

Question
Focal length is determined by:
Answer
  • Refractive index of the material
  • Thickness of the lens
  • Curvature of the lens
  • Light rays

Question 17

Question
Power is measured in Dioptres, D
Answer
  • True
  • False

Question 18

Question
The time period depends on the force being applied
Answer
  • True
  • False

Question 19

Question
The centre of mass of a symmetrical object is:
Answer
  • In the middle
  • Along its axis of symmetry

Question 20

Question
The centre of mass is that point where the mass of an object is thought to be
Answer
  • Centered
  • Concentrated
  • Clear

Question 21

Question
What is the turning effect of a force called?
Answer
  • Moment
  • Resultant

Question 22

Question
If the line of action of weight of an object lies inside the base of the object there will be a resultant moment and it will topple.
Answer
  • True
  • False

Question 23

Question
What is the moment of a force measured in?
Answer
  • D (dioptres)
  • m/s (metres per second)
  • Nm (Newton-metres)

Question 24

Question
the centripetal force need to make an object perform circular motion increases as:
Answer
  • Mass decreases
  • Mass increases
  • Radius decreases
  • Radius increases
  • Speed decreases
  • Speed increases

Question 25

Question
The acceleration towards the centre of a circle changes the direction of the body and its speed.
Answer
  • True
  • False

Question 26

Question
What is the resultant force causing acceleration called?
Answer
  • Centripecal force
  • Centripical force
  • Centripetal force

Question 27

Question
Liquids are compressible
Answer
  • True
  • False

Question 28

Question
Pressure in liquids is transmitted equally in all directions
Answer
  • True
  • False

Question 29

Question
Using different cross sectional areas of a hydraulic system means it can be used as a force multiplier.
Answer
  • True
  • False

Question 30

Question
what is produced around a wire when current flows though it?
Answer
  • Heat
  • Magnetic field

Question 31

Question
The size of a force can be increased by:
Answer
  • Increasing the size of the wire
  • Increasing the size of the current
  • Increasing the size of the voltage
  • Increasing the strength of the magnetic field

Question 32

Question
When will the conductor not experience a force?
Answer
  • When parallel to the magnetic field
  • When bearer to the magnetic field

Question 33

Question
In flemings left hand rule:
Answer
  • the first finger is the magnetic field direction
  • The second finger is the strength of the current
  • The second finger is the direction of the current
  • The thumb is the direction of the current
  • The thumb is the motion of the wire

Question 34

Question
Switch mode transformers use a lot of power when are switched on but no load is applied.
Answer
  • True
  • False

Question 35

Question
Switch mode transformers are much lighter and smaller than normal transformers working from a 50Hz mains supply
Answer
  • True
  • False

Question 36

Question
What does it mean if the electrical power input is equal to the electrical power output in a transformer?
Answer
  • It is 100% efficient
  • Heat energy was lost
  • Its 0% efficient

Question 37

Question
In a step down transformer:
Answer
  • The potential difference across the secondary coil is more than the potential difference across the primary coil
  • The potential difference across the secondary coil is less than the potential difference across the primary coil

Question 38

Question
In a step up transformer:
Answer
  • The potential difference across the secondary coil is less than the potential difference across the primary coil
  • The potential difference across the secondary coil is more than the potential difference across the primary coil

Question 39

Question
What does an alternating current in the primary coil produce?
Answer
  • A changing magnetic field
  • A constant current

Question 40

Question
What does a changing magnetic field induce in a transformer?
Answer
  • An alternating potential difference across the secondary coil
  • An constant potential difference across the secondary coil

Question 41

Question
If a magnet is moved into a coil or wire of potential difference is induced across the ends of the coil
Answer
  • True
  • False

Question 42

Question
If an electrical conductor cuts through a magnetic field a potential difference is induced across the ends of the conductor
Answer
  • True
  • False

Question 43

Question
Which of these options are part of the basic structure of a transformer?
Answer
  • Two coils around a soft core
  • One coil around a soft core
  • De magnetising soft iron
  • Magnetising soft iron
  • Layers of iron (Laminated)
  • One layer (meaning laminated)
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