Measurement of length and motion solutions Class 6 curiosity NCERT
30 October
📘 Measurement of length and motion - Class 6 curiosity solutions
1. Match the lengths with suitable units:
Some lengths are given in Column I of Table 5.5. Some units are given in Column II. Match the lengths with the units suitable for measuring those lengths.
Some lengths are given in Column I of Table 5.5. Some units are given in Column II. Match the lengths with the units suitable for measuring those lengths.
| Column I | Column II |
|---|---|
| Distance between Delhi and Lucknow | Kilometre |
| Thickness of a coin | Millimetre |
| Length of an eraser | Centimetre |
| Length of school ground | Metre |
✅ Answer:
- Distance between Delhi and Lucknow → Kilometre
- Thickness of a coin → Millimetre
- Length of an eraser → Centimetre
- Length of school ground → Metre
- Distance between Delhi and Lucknow → Kilometre
- Thickness of a coin → Millimetre
- Length of an eraser → Centimetre
- Length of school ground → Metre
2. Mark True (T) or False (F):
(i) ✅ True – The motion of a car on a straight road is linear motion.
(ii) ✅ True – If an object changes its position w.r.t. a reference point, it is in motion.
(iii) ❌ False – 1 km = 1000 m, not 100 cm.
(ii) ✅ True – If an object changes its position w.r.t. a reference point, it is in motion.
(iii) ❌ False – 1 km = 1000 m, not 100 cm.
3. Which of the following is not a standard unit of measuring length?
(i) millimetre (ii) centimetre (iii) kilometre (iv) handspan
(i) millimetre (ii) centimetre (iii) kilometre (iv) handspan
✅ Answer: (iv) handspan – It is a non-standard unit. Others are standard metric units.
4. Observation Activity:
Search for the different scales or measuring tapes at your home and school. Find the smallest value that can be measured and record your observations.
Search for the different scales or measuring tapes at your home and school. Find the smallest value that can be measured and record your observations.
Sample Table:
| Instrument | Smallest Value Measured |
|---|---|
| 15 cm Ruler | 1 mm |
| Measuring Tape | 1 mm |
| Geometry Scale | 1 mm |
5. Suppose the distance between your school and home is 1.5 km. Express it in metres.
✅ Answer:
1 kilometre = 1000 metres
So, 1.5 km = 1.5 × 1000 = 1500 metres
1 kilometre = 1000 metres
So, 1.5 km = 1.5 × 1000 = 1500 metres
Question 6:
Take a tumbler or a bottle. Measure the length of the curved part of the base of glass or bottle and record it.
Question 7:
Measure the height of your friend and express it in:
- metres (m)
- centimetres (cm)
- millimetres (mm)
Question 8:
Estimate how many coins are required to cover the length of a notebook side. Verify using a 15-cm scale.
Question 9:
Give two examples each for:
- Linear Motion: Car moving on a straight road, ball rolling down a slope
- Circular Motion: Hands of a clock, fan blade rotation
- Oscillatory Motion: Swing, pendulum of a wall clock
Question 10:
Observe objects around you and list 3 objects in each category (mm, cm, m):
| Size | Objects |
|---|---|
| mm | Pencil lead, pin, grain of rice |
| cm | Eraser, chalk, matchbox |
| m | Door height, cupboard, whiteboard |
📍Q11. A rollercoaster track is made in the shape shown in Fig. 5.19. A ball starts from point A and escapes through point F. Identify the types of motion of the ball on the rollercoaster and corresponding portions of the track.
Answer:
- 🔹 From A to B: The ball moves downward in a straight line – Rectilinear Motion.
- 🔹 From B to C: The ball travels on a curved path – Curvilinear Motion.
- 🔹 From C to D to E: The ball goes through a circular loop – Circular Motion.
- 🔹 From E to F: The ball moves on a straight horizontal track – Rectilinear Motion.
🧠 Did You Know? Rollercoasters are a real-world example of how objects experience different types of motion within a single journey!
📏Q12. Tasneem wants to make a metre scale by herself. She considers the following materials for it—plywood, paper, cloth, stretchable rubber and steel. Which of these should she not use and why?
Answer:
- ✅ Steel and Plywood are suitable because they are rigid and do not change shape easily.
- ❌ Paper can tear or fold, making it inaccurate.
- ❌ Cloth is flexible and cannot maintain straight lines.
- ❌ Stretchable Rubber changes length when stretched, so it's unreliable for measurement.
📌 Pro Tip: Measurement tools should always be made from materials that are strong, rigid, and do not expand or contract easily!
🃏Q13. Think, design and develop a card game on conversion of units of length to play with your friends.
Answer:
Here's a simple and fun card game idea:
- 🎯 Create cards with different length units like cm, m, km, mm.
- 🔄 Each card will have a conversion task. For example: “Convert 5 meters to cm”.
- ✅ The player who answers correctly keeps the card. If wrong, it goes to the discard pile.
- 🏆 The player with the most cards at the end wins!
🎮 Fun Tip: Use colorful designs and include bonus cards like “Double Points” or “Lose a Turn” for more excitement!
🎉 Great Job!
You’ve just completed all the in-depth questions from the chapter on Motion and Measurement of Distances. Keep exploring, experimenting, and asking questions — science is full of exciting adventures!
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