Measuring Length, Mass & Time — Homi Bhabha Class 6 Physics MCQs with Solutions
Free Homi Bhabha Class 6 Physics Measuring Length, Mass & Time MCQs with step-by-step solutions (10 questions). Part of Units and Measurements. Practise online on Prepizo — no login needed.
▶ Practise Measuring Length, Mass & Time online (free)
Questions with solutions
Q1 — Measuring Length, Mass & Time · easy · theory
Which instrument is used to find the mass of vegetables in a shop?
A. Weighing balance ✓ Correct
B. Ruler
C. Thermometer
D. Clock
Solution: A weighing balance (or scale) measures mass. A ruler measures length, a clock measures time, and a thermometer measures temperature.
Q2 — Measuring Length, Mass & Time · easy · theory
Which instrument would you use to measure the length of your notebook?
A. Stopwatch
B. Thermometer
C. Ruler (scale) ✓ Correct
D. Weighing balance
Solution: A ruler or scale is marked in centimetres and millimetres, so it is used to measure length such as the size of a notebook.
Q3 — Measuring Length, Mass & Time · easy · theory
The SI (standard) unit of time is the:
A. minute
B. second ✓ Correct
C. day
D. hour
Solution: Time is measured in seconds in the SI system. Hours, minutes and days are larger units built from seconds.
Q4 — Measuring Length, Mass & Time · easy · theory
Which device is best for measuring how long a runner takes to finish a race?
A. Measuring jar
B. Ruler
C. Balance
D. Stopwatch ✓ Correct
Solution: A stopwatch measures short time intervals accurately, so it is used to time a race.
Q5 — Measuring Length, Mass & Time · medium · theory
What is the best simple way to measure the length of a curved line on a map?
A. Lay a thread along the curve, then measure the thread with a ruler ✓ Correct
B. Use a straight ruler
C. Use a stopwatch
D. Use a weighing balance
Solution: A straight ruler cannot follow a curve. A thread can bend along the curve; you then straighten the thread and measure it with a ruler.
Q6 — Measuring Length, Mass & Time · medium · theory
While measuring length with a ruler whose end is worn out, you should:
A. start from the 0 mark or another clear full mark ✓ Correct
B. use a stopwatch instead
C. just guess the length
D. still start from the worn end
Solution: A worn end gives a wrong starting point. Starting from a clear mark (like 0) and reading correctly avoids the error.
Q7 — Measuring Length, Mass & Time · medium · theory
When reading a length on a ruler, where should your eye be?
A. Directly above the mark ✓ Correct
B. Far to the right of the mark
C. Far to the left of the mark
D. Anywhere you like
Solution: Looking straight down, directly above the mark, avoids the parallax error that happens when the eye is to one side.
Q8 — Measuring Length, Mass & Time · medium · theory
A beam balance is an instrument used to measure:
A. temperature
B. time
C. mass ✓ Correct
D. length
Solution: A beam balance compares an object with known masses to find its mass. It does not measure temperature, time or length.
Q9 — Measuring Length, Mass & Time · hard · numerical
A pencil is placed along a ruler. One end is at the 2 cm mark and the other end is at the 15 cm mark. How long is the pencil?
A. 2 cm
B. 13 cm ✓ Correct
C. 15 cm
D. 17 cm
Solution: The length is the difference between the two marks: 15 cm − 2 cm = 13 cm.
Q10 — Measuring Length, Mass & Time · hard · theory
Why should the marked edge of a ruler be placed right against the object being measured?
A. To make the object heavier
B. To avoid a gap that would give a wrong reading ✓ Correct
C. To measure time as well
D. To change the units
Solution: If there is a gap between the ruler marks and the object, the reading is inaccurate. Keeping the marked edge touching the object gives the correct length.