# Mock exam paper A Ordinary Level Marking Scheme PRE-LEAVING CERTIFICATE, 2011

MARKING SCHEME

PHYSICS

ORDINARY LEVEL

General Guidelines

In considering this marking scheme the following points should be noted.

1. In many instances only key words are given, words that must appear in the correct context in the candidate’s answer in order to merit the assigned marks.

2. Marks shown in brackets represent marks awarded for partial answers as indicated in the scheme.

3. Words, expressions or statements separated by a solidus, /, are alternatives which are equally acceptable.

4. Answers that are separated by a double solidus, //, are answers which are mutually exclusive. A partial answer from one side of the // may not be taken in conjunction with

a partial answer from the other side.

5. The descriptions, methods and definitions in the scheme are not exhaustive and alternative valid answers are acceptable. Marks for a description may be obtained from a relevant diagram, depending on the context.

6. Where indicated, 1 mark is deducted for incorrect/ no units.

7. Each time an arithmetical slip occurs in a calculation, one mark is deducted.

8. The context and the manner in which the question is asked and the number of marks assigned to the answer in the examination paper, determine the detail required in any question. Therefore, in any instance, it may vary from year to year.

 Ordinary Level Physics 1. In an experiment to verify the principle of conservation of momentum a trolley A travelling at velocity u was allowed to collide with a trolley B which was initially at rest. After the collision the two trolleys moved off together with velocity v. The following results were obtainedMass of trolley A = 20gMass of trolley B = 40gInitial velocity of trolley A=6ms-1 Final velocity of trolleys A and B =2ms-1(i) Draw a labelled diagram of the apparatus used in the experiment (12)Diagram showing two trolleys, means of connecting, means of measuring velocities, labeled(ii) Explain how the student calculated the velocity of the ...