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GCSE AQA Physics Unit 3

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P3: - Medical applications of physics - Using physics to make things work - Keeping things moving
Gabi Germain
Quiz por Gabi Germain, atualizado more than 1 year ago
Gabi Germain
Criado por Gabi Germain quase 10 anos atrás
144
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Resumo de Recurso

Questão 1

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

Questão 2

Questão
Ultrasound wave facts:
Responda
  • 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

Questão 3

Questão
X-rays have a very short wave length and cause ionisation
Responda
  • True
  • False

Questão 4

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

Questão 5

Questão
Properties of X-rays:
Responda
  • 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

Questão 6

Questão
What is refraction?
Responda
  • 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

Questão 7

Questão
A lens forms an image by refracting light
Responda
  • True
  • False

Questão 8

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

Questão 9

Questão
Which lens is used in a magnifying glass?
Responda
  • Converging
  • Diverging

Questão 10

Questão
Visible light can be sent along optical fibres
Responda
  • True
  • False

Questão 11

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

Questão 12

Questão
Where can the eye focus on objects?
Responda
  • Between the principal focus and the far point
  • Between the near point and the far point
  • Between the near point and the principal focus

Questão 13

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

Questão 14

Questão
The greater the refractive index
Responda
  • The flatter the lens
  • The thicker the lens

Questão 15

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

Questão 16

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

Questão 17

Questão
Power is measured in Dioptres, D
Responda
  • True
  • False

Questão 18

Questão
The time period depends on the force being applied
Responda
  • True
  • False

Questão 19

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

Questão 20

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

Questão 21

Questão
What is the turning effect of a force called?
Responda
  • Moment
  • Resultant

Questão 22

Questão
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.
Responda
  • True
  • False

Questão 23

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

Questão 24

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

Questão 25

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

Questão 26

Questão
What is the resultant force causing acceleration called?
Responda
  • Centripecal force
  • Centripical force
  • Centripetal force

Questão 27

Questão
Liquids are compressible
Responda
  • True
  • False

Questão 28

Questão
Pressure in liquids is transmitted equally in all directions
Responda
  • True
  • False

Questão 29

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

Questão 30

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

Questão 31

Questão
The size of a force can be increased by:
Responda
  • 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

Questão 32

Questão
When will the conductor not experience a force?
Responda
  • When parallel to the magnetic field
  • When bearer to the magnetic field

Questão 33

Questão
In flemings left hand rule:
Responda
  • 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

Questão 34

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

Questão 35

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

Questão 36

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

Questão 37

Questão
In a step down transformer:
Responda
  • 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

Questão 38

Questão
In a step up transformer:
Responda
  • 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

Questão 39

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

Questão 40

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

Questão 41

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

Questão 42

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

Questão 43

Questão
Which of these options are part of the basic structure of a transformer?
Responda
  • 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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