Exit to Physical quantities, units and measurement

Check what I know: Physical Quantities, Units and Measurement · G3 Physics and O-Level Physics

Check what you know about Measurement, practise what needs work, then check your progress and return for a later review.

SEC G3 Physics 2027

Learning goals

Work through the questions and use the feedback to plan revision.

Check what I know

Check what I know: Physical Quantities, Units and Measurement · G3 Physics and O-Level Physics

A text-first Measurement assessment with labelled response controls and explicit quantities, units, powers of ten and vector directions.

About 8 minutes

Check what I know

Answer 7 short questions. This starting check helps choose what to work on; it does not prove mastery.

Recent attempts

History is stored only in this browser.

No completed attempts are saved yet.

This check needs JavaScript to record answers. The reviewed questions are listed below for study.

A student writes the period of a pendulum as 2.4. What is missing?

Nothing; a number alone is a complete physical quantity.
A unit, such as 2.4 s.
A direction, because every measurement is a vector.
A prefix, because every SI unit needs one.

Which is the prescribed SI base unit for electric current?

coulomb (C)
volt (V)
watt (W)
ampere (A)

Convert 3.2 ms to seconds.

3.2 × 10⁻⁶ s
0.32 s
3.2 × 10⁻³ s
3.2 × 10³ s

An atom is about 10⁻¹⁰ m across and the Earth about 10⁷ m across. Roughly how many orders of magnitude separate them?

Which instrument is most suitable for the internal diameter of a small pipe?

A measuring tape wrapped around the pipe.
A stopwatch, because it gives a digital reading.
A digital caliper using its internal jaws.
A digital micrometer placed across the outside.

Which statement distinguishes velocity from speed?

Velocity includes direction as well as magnitude and unit; speed does not.
Speed includes direction but velocity does not.
Both are vectors because both use m/s.
Both are scalars because direction is optional.

How should two vectors be placed for a head-to-tail graphical addition?

Place both tails together and add only their drawn lengths.
Reverse the second vector before drawing it.
Ignore the scale because only the arrow directions matter.
Draw the second vector with its tail at the head of the first, preserving scale and direction.

Practise

Practise: Physical Quantities, Units and Measurement · G3 Physics and O-Level Physics

A text-first Measurement assessment with labelled response controls and explicit quantities, units, powers of ten and vector directions.

About 10 minutes

Practise

Questions are selected when you start. Use the feedback to decide what to practise next; this does not prove mastery.

Recent attempts

History is stored only in this browser.

No completed attempts are saved yet.

This check needs JavaScript to record answers. The reviewed questions are listed below for study.

A wire diameter is 0.00045 m. Which equivalent value is correct?

0.45 without a unit
45 mm
0.00045 mm
0.45 mm

Which pair correctly matches a base quantity to its SI base unit?

temperature — kelvin (K)
mass — gram (g)
time — minute (min)
length — kilometre (km)

A bacterium is about 10⁻⁶ m and a grain of sand about 10⁻³ m. How many orders of magnitude separate them?

3
−9
2
1000

What micrometer reading is shown?

The sleeve scale shows 6.5 mm and the thimble datum aligns with division 28. The micrometer has no zero error. Each thimble division represents 0.01 mm.

6.28 mm
34.5 mm
6.78 mm
6.50 mm

Which quantity is a vector?

mass
velocity
speed
energy

Two perpendicular vectors are drawn as 3.0 cm east and 4.0 cm north using 1.0 cm for 1.0 N. What should be measured for the resultant?

The arrow from the first tail to the final head; it is 5.0 cm long and points about 53° north of east.
A 7.0 cm arrow east, found by adding lengths only.
A 1.0 cm arrow south, found by subtracting lengths.
A 5.0 cm line with no arrow or direction.

Practise

Practise after feedback: Physical Quantities, Units and Measurement · G3 Physics and O-Level Physics

A text-first Measurement assessment with labelled response controls and explicit quantities, units, powers of ten and vector directions.

About 10 minutes

Practise

Questions are selected when you start. Use the feedback to decide what to practise next; this does not prove mastery.

Recent attempts

History is stored only in this browser.

No completed attempts are saved yet.

This check needs JavaScript to record answers. The reviewed questions are listed below for study.

A student writes the period of a pendulum as 2.4. What is missing?

Nothing; a number alone is a complete physical quantity.
A unit, such as 2.4 s.
A direction, because every measurement is a vector.
A prefix, because every SI unit needs one.

Which is an SI base unit?

joule
coulomb
ampere
newton

A time interval is 3.6 ms. What is it in seconds?

0.0036 without a unit
3.6 s
3600 s
0.0036 s

An atom is about 10⁻¹⁰ m across and the Earth about 10⁷ m across. Roughly how many orders of magnitude separate them?

A vernier caliper reads +0.06 cm when fully closed. How is a later reading corrected?

Add 0.06 cm
Ignore the zero error
Subtract 0.60 cm
Subtract 0.06 cm

A car travels 5 km south then 5 km north. Which statement is correct?

Distance is 10 km and displacement is 5 km north
Distance is 10 km and displacement is zero
Both distance and displacement are 10 km
Distance is zero and displacement is zero

Where does the resultant arrow begin and end in a two-vector head-to-tail construction?

It joins the two arrowheads.
It begins at the second head and points back to the first tail.
It joins the midpoints of the two arrows.
It begins at the first vector's tail and ends at the second vector's head.

Check my progress

Check my progress: Physical Quantities, Units and Measurement · G3 Physics and O-Level Physics

A text-first Measurement assessment with labelled response controls and explicit quantities, units, powers of ten and vector directions.

About 10 minutes

Check my progress

Answer 7 questions. If accepted, this result can contribute to your course progress.

Recent attempts

History is stored only in this browser.

No completed attempts are saved yet.

Check again

Check again: Physical Quantities, Units and Measurement · G3 Physics and O-Level Physics

A text-first Measurement assessment with labelled response controls and explicit quantities, units, powers of ten and vector directions.

About 10 minutes

Check again

Answer 7 questions. If accepted, this result can contribute to your course progress.

Recent attempts

History is stored only in this browser.

No completed attempts are saved yet.

Review

Review: Physical Quantities, Units and Measurement · G3 Physics and O-Level Physics

A text-first Measurement assessment with labelled response controls and explicit quantities, units, powers of ten and vector directions.

About 10 minutes

Review

Answer 7 questions. A scheduled review can contribute to your course progress only when it is due and the result is accepted.

Recent attempts

History is stored only in this browser.

No completed attempts are saved yet.

Course and syllabus information

Course: SEC G3 Physics
Edition: SEC G3 Physics 2027

Check what I know: Physical Quantities, Units and Measurement · G3 Physics and O-Level Physics

Check what I know: Physical Quantities, Units and Measurement · G3 Physics and O-Level Physics

Starting check complete

Practise: Physical Quantities, Units and Measurement · G3 Physics and O-Level Physics

Practice complete

Practise after feedback: Physical Quantities, Units and Measurement · G3 Physics and O-Level Physics

Practice complete

Check my progress: Physical Quantities, Units and Measurement · G3 Physics and O-Level Physics

Progress check complete

Check again: Physical Quantities, Units and Measurement · G3 Physics and O-Level Physics

Progress check complete

Review: Physical Quantities, Units and Measurement · G3 Physics and O-Level Physics

Review complete