Home / G3 Science (Physics) / Practical requirements / Check what I know: Practical Requirements · G3 Science Physics Exit to Practical requirements Check what I know: Practical Requirements · G3 Science Physics Check planning, measurement and data reasoning across all eleven practical groups, practise changed situations and then carry out the methods with supervised physical equipment.
Learning goals Work through the questions and use the feedback to plan revision. What this check covers: This check samples the required Practical Requirements capabilities. It routes focused practice and does not itself establish mastery. Your answers help choose what to revise next.Check what I know
Check what I know: Practical Requirements · G3 Science Physics A text-first practical-reasoning check with explicit apparatus, readings, units, variables, optical constructions, data and safety conditions; hands-on performance remains a supervised physical activity.
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Answer 6 short questions. This starting check helps choose what to work on; it does not prove mastery.
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Which plan determines the density of an irregular solid while keeping the measurements dependable?
Measure its mass with a zeroed balance, find its volume from repeated water-displacement readings at eye level, then divide mass by the mean displaced volume with units. Measure only the mass and report it as density. Use one displaced-volume reading viewed from above and divide volume by mass. Measure the beaker diameter and multiply it by the solid's mass. Which pair of investigations gives reliable evidence about free fall and the effect of force on acceleration?
Use electronic timing for several fall distances and plot distance against time squared; separately vary trolley force while keeping total mass fixed and measure repeated accelerations. Hand-time one short fall and change trolley force and mass together. Measure each object's mass only and infer both accelerations from which is heavier. Use different track surfaces for every force and plot fall distance against time. Which method correctly investigates moments and then locates the centre of gravity of an irregular lamina?
Balance a beam about a known pivot using measured perpendicular distances; for the lamina, suspend it from two points and mark the intersection of the two vertical plumb lines. Measure distances parallel to each force and draw one horizontal line on the lamina. Move the beam pivot during every reading and balance the lamina flat by eye. Multiply each force by the beam length and choose the lamina's geometric centre without testing it. Which procedures make both an insulation comparison and a reflection investigation valid?
Compare equal water masses at the same initial temperature and common times; for reflection, draw a normal and measure incidence and reflection angles from it. Use different water masses and measure both light angles from the mirror. Read the beakers after different times and omit the normal because the ray lines are enough. Change insulation and beaker size together, then assume the reflected ray always travels along the mirror. Which method can locate a plane-mirror image and also measure refraction through a transparent block?
Use no-parallax alignment with pins to locate the virtual image; trace incident and refracted rays, draw the normal, and measure angles from the normal. Project the plane-mirror image onto a screen and measure refraction angles from the block face. Estimate both results by eye without pins, ray traces or repeated positions. Place every pin on one side of the mirror and treat the incident ray as the normal. Which method correctly investigates how the resistance of a wire depends on its length?
Keep material, diameter and temperature controlled, vary measured wire length, record paired voltmeter and series-ammeter readings, and calculate R = V/I for each length. Change length and diameter together and connect both meters in series. Keep the current on at maximum so the wire heats continuously, then compare unpaired readings. Measure length only and call the numerical length the resistance in ohms. Practise
Practise: Practical Requirements · G3 Science Physics A text-first practical-reasoning check with explicit apparatus, readings, units, variables, optical constructions, data and safety conditions; hands-on performance remains a supervised physical activity.
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A solid has mass 78.0 g. Three displacement readings give 30.0, 30.5 and 30.1 cm³. Which result and treatment are appropriate?
Use the mean volume 30.2 cm³ and report density 2.58 g/cm³, while checking whether the small spread matches the cylinder resolution. Use 30.0 cm³ only and report 0.385 cm³/g. Add the readings to get 90.6 cm³ and report 0.861 g/cm³. Report 78.0 g/cm³ because mass and density have the same numerical value. A fall-distance against time-squared graph has gradient 4.9 m/s², and a fixed-mass trolley doubles its acceleration when the resultant force doubles. Which interpretation is supported?
The free-fall value is g = 9.8 m/s², and the trolley data support acceleration being proportional to resultant force at constant mass. g = 4.9 m/s², and acceleration is independent of force. g = 2.45 m/s², and doubling force must halve acceleration. g = 24.0 m/s², and the trolley result proves its mass also doubled. A 2.0 N force acts 0.30 m from a pivot. Which balancing moment and stability statement are correct?
A 0.60 N m opposite moment is needed; an object is more stable when its centre of gravity is lower and its base is wider. A 6.7 N m moment is needed; raising the centre of gravity increases stability. A 0.60 N m moment in the same direction is needed; narrowing the base increases stability. No moment is needed because forces cannot turn objects; stability depends only on mass. Equal hot-water samples cool by 12 °C and 20 °C in the same time, while a ray strikes a mirror at 35° to the normal. Which conclusions follow?
The 12 °C sample is better insulated, and the reflected ray is 35° from the normal. The 20 °C sample is better insulated, and the reflected angle is 55° from the normal. Both insulators are identical, and the reflected ray must follow the incident ray backwards. Insulation cannot be compared over equal times, and reflection changes the ray speed rather than direction. Pins aligned with a plane-mirror image show it 8.0 cm behind the mirror when the object is 8.0 cm in front. A ray entering glass bends towards the normal. Which account fits both observations?
The image is virtual and equally far behind the mirror; entering the optically denser glass reduces speed and bends the ray towards the normal. The image is real and can be caught behind the mirror; the ray speeds up in glass. The image must be 16 cm behind the mirror; the ray bends away from the normal in glass. The pins prove there is no image; refraction occurs only when light reflects. A wire has 2.4 V across it and 0.30 A through it. What resistance should be recorded, and why should the current be switched off between readings?
8.0 Ω; switching off limits heating that would otherwise change the wire's resistance. 0.72 Ω; switching off changes the wire length. 0.125 Ω; switching off increases the voltmeter resistance. 2.7 Ω; switching off removes the need to measure current. Practise
Practise after feedback: Practical Requirements · G3 Science Physics A text-first practical-reasoning check with explicit apparatus, readings, units, variables, optical constructions, data and safety conditions; hands-on performance remains a supervised physical activity.
About 10 minutes
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Questions are selected when you start. Use the feedback to decide what to practise next; this does not prove mastery.
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Beyond the syllabus: optional enrichment that does not count towards your progress.
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This check needs JavaScript to record answers. The reviewed questions are listed below for study.
One displacement reading is much larger than two close repeats. What is the best response before calculating density?
Check for trapped air, full immersion, eye position and scale reading, repeat the measurement, then justify excluding a confirmed anomalous value. Delete the largest value because the largest repeat is always wrong. Keep only the value that gives the textbook density. Add mass and volume so the unusual reading has less effect. A learner's fall times are dominated by reaction time and the trolley test changes total mass with force. Which repair addresses both faults?
Use electronic release/timing over several distances; redesign the trolley loading so resultant force changes while total moving mass stays constant. Use a shorter fall and add more trolley mass whenever force increases. Repeat the same biased methods and keep only the result nearest 9.8. Measure only both objects' weights and infer the missing times and accelerations. A beam will not balance because distances were measured from force labels, and two plumb lines on a lamina are almost parallel. What should be changed?
Measure each perpendicular distance from the pivot to the force's line of action, and suspend the lamina from a more widely separated point before drawing another vertical line. Measure every distance from the beam end and average the two nearly parallel lines. Increase every force until the beam moves and choose the lamina's visual centre. Ignore direction in moments and suspend the lamina twice from the same hole. An insulation test starts with unequal temperatures, and a reflection drawing measures angles from the mirror. Which correction is needed?
Restart with equal water masses and initial temperatures and compare common elapsed times; draw a perpendicular normal and remeasure both ray angles from it. Keep the unequal starts but compare final temperatures, and subtract each angle from the mirror length. Change beaker sizes to compensate and measure angles from any convenient line. Average both temperatures and both angles without correcting either method. The image pins still show parallax, and a refracted ray trace uses only one pin on each side of a block. What is the best repair?
Adjust the image-location pins until no relative movement is seen, and use two well-separated pins for each ray segment before drawing the lines and normal. Accept the parallax and draw every ray through the centre of the block. Use one thicker pin per segment so it covers more of the page. Move the mirror and block between observations until the expected diagram appears. Resistance readings rise during each run even though wire length is unchanged. Which change most directly repairs the investigation?
Use a lower current, switch off between paired readings and let the wire return to the same temperature before each repeat. Leave maximum current on so the readings settle at a hotter value. Pair a voltage from the cold wire with a current from the hot wire. Ignore the drift and average all values as though temperature were controlled. Course and syllabus information Course SEC G3 Combined Science Physics component Edition SEC G3 Combined Science Physics component 2027