Science: Oxygen and Answer

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THIS IS A NEW SPECIFICATION

F
Thursday 12 January 2012 – Morning
GCSE TWENTY FIRST CENTURY SCIENCE
SCIENCE A
A141/01 Modules B1 C1 P1 (Foundation Tier)

*A135170112*

Candidates answer on the Question Paper.
A calculator may be used for this paper.

Duration: 1 hour

OCR supplied materials:
None
Other materials required:

Pencil

Ruler (cm/mm)
*

A

1

4

1

0

1

*

INSTRUCTIONS TO CANDIDATES








Write your name, centre number and candidate number in the boxes above. Please write clearly and in capital letters.
Use black ink. HB pencil may be used for graphs and diagrams only. Answer all the questions.
Read each question carefully. Make sure you know what you have to do before starting your answer.
Write your answer to each question in the space provided. Additional paper may be used if necessary but you must clearly show your candidate number, centre number and question number(s).
Do not write in the bar codes.

INFORMATION FOR CANDIDATES






Your quality of written communication is assessed in questions marked with a pencil ( The number of marks is given in brackets [ ] at the end of each question or part question.
A list of physics equations is printed on page 2.
The total number of marks for this paper is 60.
This document consists of 24 pages. Any blank pages are indicated.

© OCR 2012 [R/601/7768]
DC (SHW 00668 3/11) 48567/3

).

OCR is an exempt Charity

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2
TWENTY FIRST CENTURY SCIENCE DATA SHEET
Useful relationships
The Earth in the Universe
distance = wave speed × time
wave speed = frequency × wavelength

Sustainable energy
energy transferred = power × time
power = voltage × current
efficiency =

energy usefully transferred
× 100%
total energy supplied

Explaining motion
speed =

distance travelled
time taken

acceleration =

change in velocity
time taken

momentum = mass × velocity
change of momentum = resultant force × time for which it acts work done by a force = force × distance moved in the direction of the force amount of energy transferred = work done
change in gravitational potential energy = weight × vertical height difference kinetic energy =

1
× mass × [velocity]2
2

Electric circuits
power = voltage × current
resistance =

voltage
current

voltage across primary coil
number of turns in primary coil
=
voltage across secondary coil number of turns in secondary coil Radioactive materials
energy = mass × [speed of light in a vacuum]2

© OCR 2012

3
BLANK PAGE

PLEASE DO NOT WRITE ON THIS PAGE

© OCR 2012

Turn over

4
Answer all the questions.

1

Huntington’s disease is a genetic disorder.
(a) Write down one symptom of Huntington’s disease.
.............................................................................................................................................. [1] (b) Alesha’s father has Huntington’s disease but Alesha’s mother does not. Huntington’s disease is caused by a dominant allele.

(i)

The Punnett square shows all the possible alleles that Alesha could have inherited from her parents.
Complete the Punnett square to show the alleles of Alesha’s parents.

Alesha’s mother

key
H = Huntington’s disease allele
h = normal allele

.........

.........

.........

Hh

Hh

.........

hh

hh

Alesha’s
father

[2]
(ii)

Use the Punnett square to work out the probability that Alesha has Huntington’s disease. Put a ring around the correct answer.
0

0.25

0.5

0.75

1
[1]

© OCR 2012

5
(c) The symptoms of Huntington’s disease do not usually develop until middle age. Alesha is 19 years old and she does not know if she has inherited Huntington’s disease. Alesha can have a genetic screening test. The test will tell her if she has inherited Huntington’s disease.

She is unsure whether to have the test.
Suggest one reason for and one reason against Alesha deciding to have...
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