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

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Gabi Germain
Created by Gabi Germain about 9 years ago
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GCSE AQA Physics Unit 3

GCSE AQA Physics Unit 3

Question 1 of 43

1

Ultrasound waves are partially ________ when they meet a boundary between two different media.

Select one of the following:

  • Refracted

  • Reflected

Explanation

Question 2 of 43

1

Ultrasound wave facts:

Select one or more of the following:

  • 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

Explanation

Question 3 of 43

1

X-rays have a very short wave length and cause ionisation

Select one of the following:

  • True
  • False

Explanation

Question 4 of 43

1

X-rays can't be used to diagnose and treat medical conditions

Select one of the following:

  • True
  • False

Explanation

Question 5 of 43

1

Properties of X-rays:

Select one or more of the following:

  • 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

Explanation

Question 6 of 43

1

What is refraction?

Select one of the following:

  • 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

Explanation

Question 7 of 43

1

A lens forms an image by refracting light

Select one of the following:

  • True
  • False

Explanation

Question 8 of 43

1

how is the nature of an image defined:

Select one or more of the following:

  • Size relative to the object

  • If the light rays cross

  • Real or virtual

  • Upright or inverted

  • Distance from focal length

Explanation

Question 9 of 43

1

Which lens is used in a magnifying glass?

Select one of the following:

  • Converging

  • Diverging

Explanation

Question 10 of 43

1

Visible light can be sent along optical fibres

Select one of the following:

  • True
  • False

Explanation

Question 11 of 43

1

What is long sight caused by?

Select one or more of the following:

  • Eyeball being too short

  • Eyeball being to long

  • The lens is too weak

  • The lens is too strong

Explanation

Question 12 of 43

1

Where can the eye focus on objects?

Select one of the following:

  • Between the principal focus and the far point

  • Between the near point and the far point

  • Between the near point and the principal focus

Explanation

Question 13 of 43

1

The power of a lens is given by P=1/f

Select one of the following:

  • True
  • False

Explanation

Question 14 of 43

1

The greater the refractive index

Select one of the following:

  • The flatter the lens

  • The thicker the lens

Explanation

Question 15 of 43

1

What does a camera lens and the eye have in common?

Select one or more of the following:

  • The CCDs in a digital camera is the equivalent of the retina

  • They are both diverging lens'

  • They are both converging lens'

Explanation

Question 16 of 43

1

Focal length is determined by:

Select one or more of the following:

  • Refractive index of the material

  • Thickness of the lens

  • Curvature of the lens

  • Light rays

Explanation

Question 17 of 43

1

Power is measured in Dioptres, D

Select one of the following:

  • True
  • False

Explanation

Question 18 of 43

1

The time period depends on the force being applied

Select one of the following:

  • True
  • False

Explanation

Question 19 of 43

1

The centre of mass of a symmetrical object is:

Select one of the following:

  • In the middle

  • Along its axis of symmetry

Explanation

Question 20 of 43

1

The centre of mass is that point where the mass of an object is thought to be

Select one of the following:

  • Centered

  • Concentrated

  • Clear

Explanation

Question 21 of 43

1

What is the turning effect of a force called?

Select one of the following:

  • Moment

  • Resultant

Explanation

Question 22 of 43

1

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.

Select one of the following:

  • True
  • False

Explanation

Question 23 of 43

1

What is the moment of a force measured in?

Select one of the following:

  • D (dioptres)

  • m/s (metres per second)

  • Nm (Newton-metres)

Explanation

Question 24 of 43

1

the centripetal force need to make an object perform circular motion increases as:

Select one or more of the following:

  • Mass decreases

  • Mass increases

  • Radius decreases

  • Radius increases

  • Speed decreases

  • Speed increases

Explanation

Question 25 of 43

1

The acceleration towards the centre of a circle changes the direction of the body and its speed.

Select one of the following:

  • True
  • False

Explanation

Question 26 of 43

1

What is the resultant force causing acceleration called?

Select one of the following:

  • Centripecal force

  • Centripical force

  • Centripetal force

Explanation

Question 27 of 43

1

Liquids are compressible

Select one of the following:

  • True
  • False

Explanation

Question 28 of 43

1

Pressure in liquids is transmitted equally in all directions

Select one of the following:

  • True
  • False

Explanation

Question 29 of 43

1

Using different cross sectional areas of a hydraulic system means it can be used as a force multiplier.

Select one of the following:

  • True
  • False

Explanation

Question 30 of 43

1

what is produced around a wire when current flows though it?

Select one of the following:

  • Heat

  • Magnetic field

Explanation

Question 31 of 43

1

The size of a force can be increased by:

Select one or more of the following:

  • 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

Explanation

Question 32 of 43

1

When will the conductor not experience a force?

Select one of the following:

  • When parallel to the magnetic field

  • When bearer to the magnetic field

Explanation

Question 33 of 43

1

In flemings left hand rule:

Select one or more of the following:

  • 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

Explanation

Question 34 of 43

1

Switch mode transformers use a lot of power when are switched on but no load is applied.

Select one of the following:

  • True
  • False

Explanation

Question 35 of 43

1

Switch mode transformers are much lighter and smaller than normal transformers working from a 50Hz mains supply

Select one of the following:

  • True
  • False

Explanation

Question 36 of 43

1

What does it mean if the electrical power input is equal to the electrical power output in a transformer?

Select one of the following:

  • It is 100% efficient

  • Heat energy was lost

  • Its 0% efficient

Explanation

Question 37 of 43

1

In a step down transformer:

Select one of the following:

  • 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

Explanation

Question 38 of 43

1

In a step up transformer:

Select one of the following:

  • 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

Explanation

Question 39 of 43

1

What does an alternating current in the primary coil produce?

Select one of the following:

  • A changing magnetic field

  • A constant current

Explanation

Question 40 of 43

1

What does a changing magnetic field induce in a transformer?

Select one of the following:

  • An alternating potential difference across the secondary coil

  • An constant potential difference across the secondary coil

Explanation

Question 41 of 43

1

If a magnet is moved into a coil or wire of potential difference is induced across the ends of the coil

Select one of the following:

  • True
  • False

Explanation

Question 42 of 43

1

If an electrical conductor cuts through a magnetic field a potential difference is induced across the ends of the conductor

Select one of the following:

  • True
  • False

Explanation

Question 43 of 43

1

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

Select one or more of the following:

  • 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)

Explanation

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