Measurement means finding the size or distance of an object using a number and a unit.
Motion means change in position with time when we compare an object with a reference point.
A small reading mistake can change the whole measurement. Important Questions Class 6 Science Chapter 5 help students revise length, SI units, correct measuring methods, curved lines, reference points, rest, motion, and types of motion for CBSE 2026. The chapter connects science with Deepa’s uniform, handspan measurements, metre scales, broken scales, kilometre stones, bus travel, Kabaddi court marking, swings, merry-go-rounds, and rollercoaster paths. These examples help students solve direct, numerical, activity-based, and reasoning questions from Measurement of Length and Motion.
Key Takeaways
- SI Unit: The SI unit of length is metre, written as m.
- Unit Conversion: 1 km = 1000 m, 1 m = 100 cm, and 1 cm = 10 mm.
- Reference Point: Motion and rest depend on the selected fixed point.
- Motion Types: Linear, circular, and oscillatory motion describe different paths.
Important Questions Class 6 Science Chapter 5 Structure 2026
| Principle |
Application |
Unit |
| Measurement |
Measure length with suitable tools |
metre |
| Reference Point |
Describe position, rest, and motion |
distance |
| Motion Types |
Identify path-based motion |
linear, circular, oscillatory |
Important Questions Class 6 Science Chapter 5 With Answers
Important Questions Class 6 Science Chapter 5 With Answers focus on measurement and motion. Students should write units clearly with every measured value.
Q1. What Is Measurement In Class 6 Science?
Measurement is the process of comparing an unknown quantity with a known unit. A length measurement always has a number and a unit.
For example, if a table is 13 handspans long, 13 is the number. Handspan is the unit.
Q2. Why Do We Need Standard Units?
We need standard units because body-based units differ from person to person. Handspan, foot, fist, and finger width vary among people.
A table may measure 13 handspans for one student and 14 for another. Standard units remove this confusion.
Q3. What Are The Two Parts Of A Measurement?
A measurement has two parts: a number and a unit. Both parts must be written together.
For example, 9.4 cm has number 9.4 and unit cm. Writing only 9.4 gives incomplete information.
Q4. What Is A Unit In Measurement?
A unit is a fixed quantity used for comparison during measurement. Metre, centimetre, millimetre, and kilometre are units of length.
Handspan can also act as a unit in an activity. It cannot give standard results.
Q5. Why Did Deepa And Her Friends Get Different Handspan Measurements?
They got different measurements because their handspans had different lengths. Each student used a different body-based unit.
This shows why standard units matter. A metre scale gives more reliable measurements.
Class 6 Science Chapter 5 Important Questions On SI Units Of Length
Class 6 Science Chapter 5 Important Questions on SI units test conversion and correct unit choice. Students should choose units according to object size.
Q1. What Is The SI Unit Of Length?
The SI unit of length is metre, and its symbol is m. SI stands for International System of Units.
Countries use SI units to avoid confusion. Metre gives a common standard for length measurement.
Q2. How Are Kilometre, Metre, Centimetre, And Millimetre Related?
Kilometre, metre, centimetre, and millimetre are related by fixed conversions. These conversions help express different lengths.
- Given Data:
1 km = 1000 m
1 m = 100 cm
1 cm = 10 mm
- Formula Used:
Larger unit to smaller unit means multiplication.
- Calculation:
1 m = 100 cm
1 m = 100 × 10 mm
1 m = 1000 mm
- Final Result:
1 m = 100 cm = 1000 mm
Q3. Why Is Handspan Not A Standard Unit?
Handspan is not a standard unit because its length changes from person to person. A child and an adult have different handspans.
Different students measured the same table differently. This proves handspan cannot give uniform results.
Q4. Which Unit Measures The Distance Between Two Cities?
Kilometre measures the distance between two cities. It suits long distances better than metre or centimetre.
For example, the distance between Delhi and Lucknow should use kilometres. Writing it in centimetres would become inconvenient.
Q5. Which Unit Measures The Thickness Of A Coin?
Millimetre measures the thickness of a coin. It suits very small lengths.
A centimetre is larger than a millimetre. A coin’s thickness needs a smaller unit.
SI Unit Of Length Class 6 Questions
SI Unit Of Length Class 6 questions often ask symbol, spelling, and conversions. Students should remember lowercase symbols for length units.
Q1. What Is The Symbol Of Metre?
The symbol of metre is m. It must appear in lowercase.
Students should write a space between number and unit. For example, write 5 m, not 5m.
Q2. What Is The Symbol Of Centimetre?
The symbol of centimetre is cm. It also appears in lowercase.
Students should not add “s” after unit symbols. Write 15 cm, not 15 cms.
Q3. What Is The Symbol Of Millimetre?
The symbol of millimetre is mm. It measures small lengths.
The smallest value on a common 15-cm scale is usually 1 mm. It equals one-tenth of a centimetre.
Copyable relation: 1 mm = 0.1 cm
Q4. What Is The Symbol Of Kilometre?
The symbol of kilometre is km. It measures large distances.
Road distances often use kilometres. Kilometre stones show distance from a reference place.
Q5. Why Should Students Leave Space Between Number And Unit?
Students should leave space because scientific writing separates the value from the unit. This makes measurements clear.
For example, 10 cm is correct. Unit symbols do not need plural endings.
Measurement Of Length Class 6 Questions On Correct Measuring Method
Measurement Of Length Class 6 Questions on correct methods help students avoid reading errors. Scale placement and eye position matter in every measurement.
Q1. What Is The Correct Way To Place A Scale?
The scale should touch the object and lie along its length. It must not stay tilted.
A tilted scale gives a wrong reading. The object and scale should stay aligned.
Q2. What Is The Correct Eye Position While Reading A Scale?
The eye should be directly above the mark being read. This gives the correct scale reading.
If the eye stays to the left or right, the reading may change. This error happens because of wrong viewing angle.
Q3. How Do You Measure With A Broken Scale?
Use any clear full mark and subtract the starting reading from the ending reading. This method works when zero is broken.
- Given Data:
Starting reading = 1.0 cm
Ending reading = 10.4 cm
- Formula Used:
Length = final reading - initial reading
- Calculation:
Length = 10.4 cm - 1.0 cm
Length = 9.4 cm
- Final Result:
Length = 9.4 cm
Q4. Why Should Students Write Units With Every Length?
Students should write units because a number alone does not describe length completely. A measurement needs a number and a unit.
For example, 12 could mean 12 cm, 12 m, or 12 mm. Unit writing removes confusion.
Q5. Which Tool Measures The Girth Of A Tree?
A flexible measuring tape measures the girth of a tree. A rigid metre scale cannot bend around the trunk.
Tailors also use flexible measuring tapes. They measure curved body parts accurately.
Correct Way Of Measuring Length Class 6 Questions
Correct Way Of Measuring Length Class 6 questions check scale use in daily activities. These answers help students write practical science responses.
Q1. Which Tool Measures A Pencil Length?
A 15-cm scale can measure a pencil length. The pencil is small enough for this tool.
Place the pencil along the scale. Read from zero or another clear full mark.
Q2. Which Tool Measures The Height Of A Room?
A metre scale or measuring tape can measure the height of a room. A short scale will be inconvenient.
Longer lengths need longer tools. Measuring tape works well for bigger distances.
Q3. How Do Visually Challenged Students Measure Length?
Visually challenged students use scales with raised markings. They can feel these markings by touch.
This helps them read measurements independently. Such scales make measurement more accessible.
Q4. Why Can Two Students Get Slightly Different Scale Readings?
Two students may get different readings due to scale placement, eye position, or reading error. Small mistakes affect measurement.
The scale should align with the object. The eye should stay directly above the mark.
Q5. Why Is A Steel Scale Better Than Stretchable Rubber?
A steel scale is better because it keeps a fixed length. Stretchable rubber changes length during use.
A changing scale cannot give standard measurement. Tasneem should avoid stretchable rubber for a metre scale.
Class 6 Science Measurement And Motion Questions On Curved Lines
Class 6 Science Measurement And Motion Questions include curved-line measurement from daily life. A thread or flexible tape helps measure curved paths.
Q1. How Can Students Measure A Curved Line?
Students can measure a curved line using a thread or flexible measuring tape. The thread follows the curve.
- Given Data:
Curved line length needs measurement.
- Formula Used:
Curved line length = length of straightened thread
- Steps:
Place the thread along the curved line.
Mark the endpoints on the thread.
Straighten the thread and measure it with a scale.
- Final Result:
Curved line length = length of straightened thread
Q2. Why Is Flexible Measuring Tape Used?
Flexible measuring tape is used because it bends along curved surfaces. Rigid scales cannot follow curves.
Tailors use flexible tape for body measurements. It also helps measure girth and curved edges.
Q3. How Can Students Measure The Base Of A Bottle?
Students can measure the curved base using a thread. The thread should go around the curved boundary.
Straighten the thread after marking the length. Then measure it with a metre scale.
Q4. How Can Electric String Light Length Be Measured For An Arch?
The arch length can be measured with a flexible measuring tape or thread. The measuring tool must follow the curve.
After using thread, straighten it. Then measure the thread with a scale.
Q5. Why Is A Rigid Scale Not Suitable For Curved Lines?
A rigid scale is not suitable because it cannot bend along the curve. It measures straight lengths better.
Curved paths need flexible tools. Thread and tailor’s tape solve this problem.
Curved Line Measurement Class 6 Questions For Activities
Curved Line Measurement Class 6 questions help students apply measurement to objects around them. These tasks check method and tool choice.
Q1. How Can Students Measure A Leaf?
Students can measure a leaf using a 15-cm scale for length and breadth. The longest side gives length.
The widest side gives breadth. Fallen leaves should be used for this activity.
Q2. Why Do Leaves Of The Same Tree Have Different Sizes?
Leaves of the same tree can differ because they grow at different stages and positions. Sunlight and space also affect growth.
Some leaves may be young. Some leaves may be fully grown.
Q3. How Can Students Find The Thickness Of One Page?
Students can measure many pages together and divide by the number of pages. One page is too thin for direct measurement.
- Given Data:
Number of pages = n
Total thickness = T
- Formula Used:
Thickness of one page = total thickness ÷ number of pages
Thickness of one page = T ÷ n
- Example Calculation:
If 100 pages have thickness = 5 mm
Thickness of one page = 5 mm ÷ 100
Thickness of one page = 0.05 mm
- Final Result:
Thickness of one page = 0.05 mm
Q4. How Can A Bicycle Measure Distance?
A bicycle can measure distance by counting wheel rotations and multiplying by wheel boundary length. The wheel covers one boundary length per turn.
- Given Data:
Number of wheel turns = n
Wheel boundary length = l
- Formula Used:
Distance travelled = number of wheel turns × wheel boundary length
Distance travelled = n × l
- Calculation:
Count the wheel turns.
Measure the outer boundary of the wheel with a string.
Multiply both values.
- Final Result:
Distance travelled = n × l
Q5. What Is A Jones Counter Used For?
A Jones Counter measures distance by recording bicycle wheel rotations. Road-running races use such methods.
It attaches to a bicycle wheel. It helps calculate distance travelled accurately.
Important Questions Class 6 Science Chapter 5 On Reference Point
Important Questions Class 6 Science Chapter 5 on reference point explain position, rest, and motion. A fixed point makes distance statements meaningful.
Q1. What Is A Reference Point?
A reference point is a fixed object or point used to describe distance or position. It helps compare where something is.
For example, a bus stand can act as a reference point. Students can compare distances from it.
Q2. Why Is A Reference Point Important?
A reference point is important because position changes depending on the point selected. The same place can look near or far.
Deepa’s friends gave different answers about school and garden distance. They used their own homes as reference points.
Q3. How Do Kilometre Stones Use A Reference Point?
Kilometre stones show distance from a fixed place used as a reference point. A stone reading “Delhi 70 km” uses Delhi as reference.
When the next stone reads “Delhi 60 km”, the traveller is closer. The distance from Delhi has decreased.
Q4. How Is Position Described With Respect To A Reference Point?
Position is described by stating distance from a reference point. The reference point gives meaning to the distance.
If a stone says Delhi 70 km, the position is 70 km from Delhi. Delhi acts as the fixed point.
Q5. Why Did Deepa’s Friends Disagree About Distance?
They disagreed because each student compared distances from a different house. Their reference points were different.
If all used the bus stand, their answers would match. Same reference point gives a common comparison.
Reference Point Class 6 Science Questions
Reference Point Class 6 Science questions help students understand relative position. The idea also explains why rest and motion depend on comparison.
Q1. Can A Bus Passenger Be At Rest?
A bus passenger can be at rest with respect to the bus. The passenger’s position does not change inside the bus.
Seats and other passengers stay nearby. The bus becomes the reference point.
Q2. Can The Same Passenger Be In Motion?
The same passenger can be in motion with respect to objects outside the bus. Buildings and trees appear behind.
Here, a building acts as the reference point. The passenger’s position changes with respect to it.
Q3. What Happens When Reference Point Changes?
The description of rest or motion can change when the reference point changes. This makes reference point very important.
A passenger may rest inside a bus. The passenger moves relative to a road-side building.
Q4. Why Is A Reference Point Needed In A Kabaddi Court?
A reference point helps mark lines at correct distances on the ground. It keeps measurements organised.
The sports teacher can measure court lines from one fixed point. This improves accuracy.
Q5. What Is The Link Between Reference Point And Motion?
Motion means change in position with respect to a reference point over time. Without reference point, motion cannot be judged clearly.
A moving bus changes position with respect to a tree. That tree can act as the reference point.
Motion Class 6 Science Important Questions
Motion Class 6 Science Important Questions explain how objects move or stay at rest. Students must always mention reference point and time.
Q1. What Is Motion?
Motion is a change in position with respect to a reference point with time. This definition needs both reference point and time.
A cow grazing in a field may change position. It is in motion with respect to a tree.
Q2. What Is Rest?
Rest means no change in position with respect to a reference point with time. The object stays at the same position.
A tree is at rest with respect to the ground. Its position does not change over time.
Q3. Can One Object Be At Rest And In Motion?
Yes, one object can be at rest and in motion at the same time. It depends on the reference point.
A passenger is at rest with respect to the bus. The same passenger is in motion with respect to a building.
Q4. How Can Students Decide Whether An Object Is Moving?
Students can check whether the object’s position changes with respect to a reference point. Time must also pass.
If position changes, the object is in motion. If position does not change, it is at rest.
Q5. Why Is Motion Called Relative?
Motion is relative because it depends on the observer’s reference point. Different observers can describe the same object differently.
Deepa’s bus example shows this idea. Inside and outside observers use different reference points.
Types Of Motion Class 6 Questions And Answers
Types Of Motion Class 6 Questions And Answers cover linear, circular, oscillatory, and periodic motion. Students should identify the path first.
Q1. What Is Linear Motion?
Linear motion is motion along a straight line. A falling eraser can show linear motion.
A car moving on a straight road also shows linear motion. A marching parade may also move in a straight line.
Q2. What Is Circular Motion?
Circular motion is motion along a circular path. A whirled eraser tied to a thread shows circular motion.
A merry-go-round also shows circular motion. The object repeats a circular path again and again.
Q3. What Is Oscillatory Motion?
Oscillatory motion is to-and-fro motion about a fixed position. A swing shows oscillatory motion.
A hanging eraser pulled to one side also oscillates. A metal strip moving up and down shows this motion.
Q4. What Is Periodic Motion?
Periodic motion repeats its path after a fixed interval of time. Circular and oscillatory motions can be periodic.
A merry-go-round repeats its circular path. A swing repeats its to-and-fro path.
Q5. What Type Of Motion Does A Swing Show?
A swing shows oscillatory motion. It moves to and fro about a fixed position.
Its motion also repeats after some time. That makes it periodic in nature.
Linear Circular Oscillatory Motion Class 6 Examples
Linear Circular Oscillatory Motion Class 6 examples help students classify daily motions. Students should match each motion with its path.
Q1. Give Two Examples Of Linear Motion.
A falling eraser and a car on a straight road show linear motion. Both move along a straight path.
A march-past also shows linear motion. The path decides the motion type.
Q2. Give Two Examples Of Circular Motion.
A merry-go-round and a stone tied to a thread show circular motion. Both move along circular paths.
A wheel also shows circular motion. Its rim moves around a centre.
Q3. Give Two Examples Of Oscillatory Motion.
A swing and a vibrating metal strip show oscillatory motion. Both move to and fro about a fixed position.
A hanging eraser pulled aside also oscillates. It returns and repeats its motion.
Q4. Is Circular Motion Periodic?
Circular motion is usually periodic because the object repeats its path. It comes back after a fixed interval.
A merry-go-round shows this clearly. It follows the same circular path repeatedly.
Q5. Is Oscillatory Motion Periodic?
Oscillatory motion is usually periodic because it repeats to-and-fro movement. It moves about a fixed position.
A swing repeats its motion. This makes it a periodic motion.
Measurement Of Length And Motion Class 6 Extra Questions
Measurement Of Length And Motion Class 6 Extra Questions help students practise conversions, reasoning, and activity-based answers. These questions match CBSE 2026 classroom tasks.
Q1. Convert 1.5 km Into Metres.
1.5 km equals 1500 m. Kilometre changes into metre by multiplying by 1000.
- Given Data:
Distance = 1.5 km
- Formula Used:
1 km = 1000 m
- Calculation:
1.5 km = 1.5 × 1000 m
1.5 km = 1500 m
- Final Result:
1.5 km = 1500 m
Q2. Match Lengths With Suitable Units.
City distance uses kilometre, coin thickness uses millimetre, eraser length uses centimetre, and school ground length uses metre. Unit choice depends on size.
- Distance between Delhi and Lucknow: kilometre
- Thickness of a coin: millimetre
- Length of an eraser: centimetre
- Length of school ground: metre
Q3. Which Statement Is False: 1 km = 100 cm?
The statement 1 km = 100 cm is false. The correct conversion is 1 km = 100000 cm.
- Given Data:
1 km = 1000 m
1 m = 100 cm
- Formula Used:
1 km = 1000 × 100 cm
- Calculation:
1 km = 100000 cm
- Final Result:
1 km = 100000 cm
Q4. Why Should Stretchable Rubber Not Make A Metre Scale?
Stretchable rubber should not make a metre scale because its length can change. A measuring scale must remain fixed.
Paper and cloth may also bend or change shape easily. Steel and plywood give more stable length.
Q5. What Types Of Motion Occur On A Rollercoaster Track?
A rollercoaster can show linear motion on straight parts and circular motion on curved loops. The motion type changes with track shape.
Straight sections show linear motion. Curved circular sections show circular motion.
Class 6 Science Chapter 5 Questions And Answers From Exercises
Class 6 Science Chapter 5 Questions And Answers from exercises test accuracy. These answers follow the 2026 textbook concepts.
Q1. Which Is Not A Standard Unit Of Length: Millimetre, Centimetre, Kilometre, Or Handspan?
Handspan is not a standard unit of length. It varies from person to person.
Millimetre, centimetre, and kilometre are standard units. They belong to length measurement.
Q2. Is A Car Moving On A Straight Road An Example Of Linear Motion?
Yes, a car moving on a straight road shows linear motion. It moves along a straight-line path.
This matches the definition of linear motion. The path decides the motion type.
Q3. Is An Object In Motion If Its Position Changes With Time?
Yes, an object is in motion if its position changes with respect to a reference point with time. Both conditions matter.
The reference point gives the comparison. Time shows whether the position changed.
Q4. How Can Students Measure A Curved Bottle Base?
Students can place a thread along the curved base and then measure the thread. This method follows the curve accurately.
A straight scale cannot bend around the base. Thread gives a better curved-line measurement.
Q5. How Can Students Estimate Coins Needed For A Notebook Side?
Students can divide the notebook side length by one coin’s length. This gives the estimated number of coins.
- Given Data:
Notebook side length = L
Coin length = c
- Formula Used:
Number of coins = notebook side length ÷ coin length
Number of coins = L ÷ c
- Calculation:
Measure L with a scale.
Measure c with the same scale.
Divide L by c.
- Final Result:
Number of coins = L ÷ c
Class 6 Science Important Links