EXAM CONDITIONS
Your bench has been set out for 0625/51.
Everything on this paper is what the confidential instructions told the technician to put in front of you — the same solutions, the same glassware, labelled exactly as the candidate sees them. You are not told what B, C, D, E or F are. That's the point.
4 tasks · 17 questions · 40 marks
Moments: finding the weight of an unknown mass
Balance a metre ruler pivoted on a triangular block against an unmarked mass Q, using 2.0 N and 3.0 N reference loads, and use moments to find Q's weight.
Resistance of a wire (slide-wire potentiometer)
Slide a contact along ~105 cm of taped-down constantan wire, reading current and the p.d. across increasing lengths BC, to find how resistance depends on length.
Refraction through a rectangular glass block
Trace an incident ray into a glass block with optics pins, find the emergent ray by sighting through it, and measure the equivalent angle on both sides of the normal.
Planning: comparing electrical heaters
Written only — plan an experiment comparing how quickly five 12 V heaters bring water to the boil.