Standard & Non-standard Units — Homi Bhabha Class 6 Physics MCQs with Solutions
Free Homi Bhabha Class 6 Physics Standard & Non-standard Units MCQs with step-by-step solutions (10 questions). Part of Units and Measurements. Practise online on Prepizo — no login needed.
▶ Practise Standard & Non-standard Units online (free)
Questions with solutions
Q1 — Standard & Non-standard Units · easy · theory
Which of the following is a standard unit of length?
A. Footstep
B. Handspan
C. Cubit
D. Metre ✓ Correct
Solution: The metre is a standard (SI) unit whose length is fixed and the same everywhere. Handspan, footstep and cubit change from person to person.
Q2 — Standard & Non-standard Units · easy · theory
Which of these is a non-standard unit for measuring length?
A. Handspan ✓ Correct
B. Kilometre
C. Centimetre
D. Metre
Solution: A handspan (the distance across an open hand) differs for each person, so it is a non-standard unit. Metre, centimetre and kilometre are fixed standard units.
Q3 — Standard & Non-standard Units · easy · theory
Why do we use standard units instead of body parts like the cubit?
A. Standard units give the same value for everyone ✓ Correct
B. Body parts are too long
C. Body parts cost money
D. Standard units are older
Solution: A standard unit has one fixed size, so measuring the same thing gives the same answer for everyone. Body parts vary from person to person.
Q4 — Standard & Non-standard Units · easy · theory
The system of units used by scientists all over the world is called the:
A. SI system ✓ Correct
B. Market system
C. Foot system
D. Body system
Solution: SI stands for the International System of Units (metre, kilogram, second, and so on), which scientists everywhere agree to use.
Q5 — Standard & Non-standard Units · medium · theory
Long ago people measured cloth using the "cubit" (elbow to fingertip). Why was this a problem?
A. A cubit can measure only metal
B. A cubit is too small to measure cloth
C. A cubit needs a machine
D. Everyone's arm length is different ✓ Correct
Solution: Because arm lengths differ, one person’s cubit is not equal to another’s, so the same cloth measured different amounts. That is why fixed units are needed.
Q6 — Standard & Non-standard Units · medium · theory
Which set contains only standard units?
A. metre, footstep, second
B. handspan, footstep, cubit
C. metre, kilogram, second ✓ Correct
D. pace, kilogram, cubit
Solution: Metre, kilogram and second are all fixed SI standard units. The other sets include body-based (non-standard) units like handspan, footstep, cubit and pace.
Q7 — Standard & Non-standard Units · medium · theory
A "footstep" is called a non-standard unit because:
A. it can measure only short distances
B. its length changes from person to person ✓ Correct
C. it is used only by scientists
D. it is very accurate
Solution: One person’s footstep is longer or shorter than another’s, so it does not give a fixed, reliable value. That makes it a non-standard unit.
Q8 — Standard & Non-standard Units · medium · theory
The SI (standard) unit of mass is the:
A. metre
B. litre
C. kilogram ✓ Correct
D. second
Solution: Mass is measured in kilograms in the SI system. The metre measures length, the second measures time, and the litre measures volume.
Q9 — Standard & Non-standard Units · hard · theory
Two friends measure the same room using their own "footsteps". Ravi gets 20 footsteps and Sara gets 24. Why is their answer different?
A. Their footsteps are different lengths ✓ Correct
B. They both counted wrongly
C. The room changed its size
D. Footstep is a standard unit
Solution: The room is the same size. Because a footstep is non-standard, Sara’s shorter footsteps mean she needs more of them to cover the same distance.
Q10 — Standard & Non-standard Units · hard · theory
Which statement about standard units is correct?
A. They can be used only in India
B. They give different results for different people
C. They change with the weather
D. They are fixed and the same for everyone ✓ Correct
Solution: A standard unit has one fixed, agreed size, so it gives the same measurement for everyone, everywhere, at all times.