Neco 2022 physics practicals
2022 NECO PHYSICS PRACTICALS
[UNDER REFLECTION OF LIGHT BY PLANE SURFACE]
(i) Forms an upright image always.
(ii) Image formed when light is reflected is always the same size as object.
[UNDER REFLECTION OF LIGHT BY CURVED SURFACE]
(i) Image formed by by curved mirror can be inverted or upright image formed.
(ii) Image formed depends on where the object is placed.
Angle about a point = 360°.
Angle between mirror = 360° – 320° = 40°.
No. of images formed by an inclined mirror = 360/∅ – 1,
Therefore, 9 – 1 = 8.
Therefore, Number of images = 8 images.
(3bi) The possible cause of a one sided deflection of the galvanometer can be because the potential difference between the ends of the potentiometer wire or the E.M.F. of the cell connected in the main circuit may not be greater than the E.M.F. of the cells whose E.M.F. are to be compared.
The positive terminals of the cells and the battery used, the circuit might not be connected to the same end of the potentiometer wire.
CORRECTION: In such a case we will ensure if all connections are tight and connecting wire are not broken.
(3bii) Parallel ——> Voltage remains
NECO 2022 SSCE PHYSICS PRACTICAL
INSTRUCTIONS TO SCHOOL
1. Great care should be taken to ensure that the information given below does not reach candidates either directly or indirectly before the examination.
2. In addition to the usual apparatus in a Physics laboratory, each candidate will require in general; Mathematical tables, Graph paper and Geometrical instruments. For questions 1, 2 and 3 the apparatus listed below are required.
– 2 Meter rules
– Optical pin
– Mass hanger of 50g
– 4 Masses of 50g each
– Retort stand
– Plane mirror
– Four optical pins
– Four thumb pins
– Plain sheets
– Drawing board
– Mirror holder
– Resistance box
– Zero-centre galvanometer
– 2V Accumulator or 2 x 1.5V dry Leclanchè cell
– Plug key
– Metre bridge
– Connecting wires
– 2Ω Standard resistor covered and labelled x
– 1Ω Resistor
CONDUCT OF THE PHYSICS PRACTICAL TEST
3. The following announcements should be made to the candidates at the beginning of the examination.
“The Examiner does not want you to waste your time because you cannot proceed with an experiment. Therefore, any candidate who cannot get on with the experiment after spending ¼ hour on it should call on me and ask for help”.
4. The Physics teacher is allowed to give a hint to any of the candidates who are unable to proceed with the experiment.
5. The following regulations must be strictly adhered to:
(a) No hint may be announced to the candidates as a whole
(b) A candidate who is unable to proceed and requires assistance must call on the teacher and state his/her difficulty
(c) The candidate(s) should be told that the Examiner will be informed of any assistance given in this way
(d) A note must be made on the Report Form of any assistance given to any of the candidates with the name and examination number of the candidate
6. The Report Form is provided separately on which the following should be stated:
(a) Detailed information about the apparatus where necessary
(b) Any particular difficulty experienced by any of the candidates, especially if the Examiner would be unable to discover this from the scripts
(c) Any departure from the specific items which could not be avoided
(d) Any assistance given to the candidate(s) under the regulations explained in “5”.
7. Where several sets of apparatus are provided for a question and specific information about the apparatus is required by the Examiner, each piece of apparatus must be clearly marked with letters A, B, C, D etc. Also, the corresponding information must be clearly reported, showing which apparatus was supplied to which candidate. The candidate(s) should be instructed to record these letters on their script(s).
8. You must enclose a completed Report Form in each envelope of scripts.