Physics Module 7. Practice Test Mark Scheme. Higher. Question Expected
answers. Marks. Additional guidance. 1 a Alpha 12 intensity peaks at a lower ...
Physics Module 7 Practice Test Mark Scheme Higher Question
Expected answers
Marks
1
a
Alpha 12 intensity peaks at a lower wavelength; So peaks at a higher frequency (So has a higher temperature)
1 1
b
Beta 34 has more (absorption) lines than Alpha 12; So it has more elements (So Jack and Jill are wrong)
1 1
c
In a scientific journal / at a conference; So that other scientists can check / evaluate their results
1 1
Additional guidance
Total marks 6
Twenty First Century Science Physics Module 7 Higher © Oxford University Press 2011
Page 1 of 7
1
2
The answer accurately describes how a large cloud of gas becomes a star. Sufficient detail from the points listed is included. The answer shows almost faultless spelling, punctuation, and grammar. It is coherent and in an organised, logical sequence. It contains a range of specialist terms used accurately.
5/6
Moderate detail from the points listed is included. There are some errors in spelling, punctuation, and grammar. The answer has some structure and organisation. The use of specialist terms has been attempted, but not always accurately.
3/4
Minimal detail from the points listed is included. The spelling, punctuation, and grammar are very weak. The answer is poorly organised with almost no specialist terms and/or their use demonstrates a general lack of understanding of their meaning. No relevant content.
1/2
0
Marks awarded for this answer will be determined by the standard of the scientific response as well as the quality of written communication (QWC). There are no discrete marks for the assessment of written communication, but QWC will be one of the criteria used to assign the answer to an appropriate level. Examples of scientific points made in response include:
gravity shrinks the cloud
making particles move towards each other
increasing particles' energy
particles bump into each other
transferring energy between them
temperature is energy of particles
particles bump into each other harder or more often
pressure fixed by collision rate or momentum of particles.
Total marks 6
Twenty First Century Science Physics Module 7 Higher © Oxford University Press 2011
Page 2 of 7
2
3
Mercury, Venus, Mars, Jupiter and Saturn
2
i
Ratio of sphere radii matches ratio of planetary orbit sizes; the number of spheres matches the number of planets
1 1
ii
Model discarded; Because it disagreed with the new data
1 1
a b
Complete list for 2 marks One error or omission, allow 1 mark
OR
Data checked carefully; because Kepler’s model had worked for years Total marks 6 4
The answer describes and explains the differences between a solar day and a sidereal day. Sufficient detail from the points listed is included. The answer shows almost faultless spelling, punctuation, and grammar. It is coherent and in an organised, logical sequence. It contains a range of specialist terms used accurately.
5/6
Moderate detail from the points listed is included. There are some errors in spelling, punctuation, and grammar. The answer has some structure and organisation. The use of specialist terms has been attempted, but not always accurately.
3/4
Minimal detail from the points listed is included. The spelling, punctuation, and grammar are very weak. The answer is poorly organised with almost no specialist terms and/or their use demonstrates a general lack of understanding of their meaning. No relevant content.
1/2
0
Marks awarded for this answer will be determined by the standard of the scientific response as well as the quality of written communication (QWC). There are no discrete marks for the assessment of written communication, but QWC will be one of the criteria used to assign the answer to an appropriate level. Examples of scientific points made in response include: solar day is 24 hours long time from noon to noon noon is when Sun at highest point in sky sidereal day is 23 hours 56 minutes time for one rotation of Earth compared with fixed stars difference is because Earth orbits Sun so Earth has to rotate more than 360 to get Sun to same place in sky.
Total marks 6 Twenty First Century Science Physics Module 7 Higher © Oxford University Press 2011
Page 3 of 7
3
5
The answer explains why increasing the size of a reflecting telescope usually improves the quality of its images of stars. Sufficient detail from the points listed is included. The answer shows almost faultless spelling, punctuation, and grammar. It is coherent and in an organised, logical sequence. It contains a range of specialist terms used accurately.
5/6
Moderate detail from the points listed is included. There are some errors in spelling, punctuation, and grammar. The answer has some structure and organisation. The use of specialist terms has been attempted, but not always accurately.
3/4
Minimal detail from the points listed is included. The spelling, punctuation, and grammar are very weak. The answer is poorly organised with almost no specialist terms and/or their use demonstrates a general lack of understanding of their meaning. No relevant content.
1/2
Marks awarded for this answer will be determined by the standard of the scientific response as well as the quality of written communication (QWC). There are no discrete marks for the assessment of written communication, but QWC will be one of the criteria used to assign the answer to an appropriate level. Examples of scientific points made in response include:
0
larger mirror
captures more light
so image is brighter
larger aperture
gives less diffraction
so image is sharper
longer focal length of mirror
gives greater magnification.
Total marks 6
Twenty First Century Science Physics Module 7 Higher © Oxford University Press 2011
Page 4 of 7
4
6
a
b
05 × 100 = 50 pressure = 50/0.1 = 500 kPa
1
Correct conversion from centigrade to kelvin (290 K and 300 K); 500 kPa / 290 K = new pressure / 300 K new pressure = (500 × 300) / 290 = 517 kPa
1 1
Allow one mark for correct method (rearraneging equaiton).
1 Allow error carried forward from a
Total marks 4 7
a
A mirror...
...makes a spectrum of each star.
The orbit...
...ensures wide coverage of the sky.
A grating...
...controls the orientation ... telescope.
A computer...
...allows images ... range of wavelengths.
Scientists benefit; Because they can obtain data to test explanations; Populations of a country pay; Through their taxes
b
3
Correct selection for 3 marks With one or two mistakes, allow 2 marks With three mistakes, allow 1 mark A mistake is
an incorrect line
a missing line
an extra line
1 1 1 1 Total marks 7
8
To get the best estimate of the true value.
1
i
13.00 – 12.50 = 0.5 arc seconds
1
ii
parallax angle = half angel moved = 0.25 distance = 1/parallax angel = 4 parsecs
1 1
a b
Total marks 4
Twenty First Century Science Physics Module 7 Higher © Oxford University Press 2011
Page 5 of 7
5
9
a
i
1
Continued straight line for one mark
ii
2
Ray parallel to one through centre for one mark Then straight to join other ray at screen for second mark
b
0.80 m
1
c
Focal length = 0.02 m; Power = 50 d;
1 1
Allow error carried forward from incorrect b Allow error carried forward focal length
Total marks 6
Twenty First Century Science Physics Module 7 Higher © Oxford University Press 2011
Page 6 of 7
6
10
Distance = 0.775 Mpc; Speed = 57(.34) km/s
a
b
1 1
Error carried forward: accept 185 km/s for 1 mark
1
They don’t contain Cepheid variable stars. X-rays come from the black hole at their centre. Telescopes show they are made of billions of stars.
Their spectrum shows they are moving ... the Milky Way. c
1
Galaxies are charged and repel each other. The Universe is 14 thousand million years old. Space has been expanding ever since the Big Bang.
Some galaxies are further away from... than others. Total marks 4 11
Lighter Heavier More
2
i
Higher pressure; Higher temperature
1 1
ii
3 42 He
1
a
b
12 6C
Completely correct for 2 marks With one mistake, allow 1 mark
Both correct for the mark
Total marks 5 Paper total 60
Twenty First Century Science Physics Module 7 Higher © Oxford University Press 2011
Page 7 of 7
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