Extra Questions for Class 6 Science Chapter 5: Measurement of Length and Motion

Reading Time: 15 minutes

Last Updated on April 6, 2025 by XAM CONTENT

Looking for well-structured and exam-ready extra questions for Class 6 Science? You’re in the right place! On this page, you’ll find a curated set of very short answer, short answer, and long answer questions from Chapter 5 Measurement of Length and Motion of the NCERT textbook, along with MCQs, assertion-reason, passage-based, and competency-based questions — all with accurate and student-friendly answers.

Question Type	Number of Questions
Very Short Answer Type (1 mark)	15 Questions
Short Answer Type (2–3 marks)	10 Questions
Long Answer Type (4–5 marks)	5 Questions
Multiple Choice Questions (MCQs)	10 Questions
Assertion-Reason Questions	2 Questions
Passage-Based Questions	6 Questions
Match the Column / Table-Based	2 Questions

Measurement of Length and Motion Extra Questions for Class 6 Science

Very Short Answer Questions (1 Mark Each)

Q1: What is measurement?

Ans: It is the comparison of an unknown quantity with a known standard unit.

Q2: Name the SI unit of length.

Ans: Metre.

Q3: How many centimetres make one metre?

Ans: 100 centimetres.

Q4: What is used to measure the length of a curved line?

Ans: A thread.

Q5: Name an instrument used to measure small lengths.

Ans: Scale or ruler.

Q6: What type of motion does a pendulum show?

Ans: Periodic motion.

Q7: What is rectilinear motion?

Ans: Motion in a straight line.

Q8: Give an example of circular motion.

Ans: Motion of a ceiling fan.

Q9: Which type of motion is seen in the hands of a clock?

Ans: Circular and periodic.

Q10: What is the length of a standard metre scale?

Ans: 100 cm.

Q11: What is uniform motion?

Ans: When a body covers equal distance in equal time.

Q12: What is non-uniform motion?

Ans: When a body covers unequal distance in equal time.

Q13: Can motion be more than one type at the same time?

Ans: Yes.

Q14: What is the unit of distance in the metric system?

Ans: Metre.

Q15: Name one tool used to draw straight lines.

Ans: A ruler.

Short Answer Questions (2–3 Marks Each)

Q1: Why is measurement important in daily life?

Ans: Measurement helps us compare, build, and understand sizes, distances, and quantities.

Q2: Explain the correct way to measure length using a scale.

Ans: Place the object along the edge of the scale starting at 0. Keep your eye at level with the marking to avoid parallax error.

Q3: Write two differences between uniform and non-uniform motion.

Ans: Uniform motion: Equal distances in equal intervals. Non-uniform motion: Unequal distances in equal intervals.

Q: What are the three types of motion? Give one example of each.

Ans: 1. Rectilinear (e.g., train on track), 2. Circular (e.g., fan), 3. Periodic (e.g., pendulum).

Q4: Why should we avoid using worn out scales?

Ans: They may not show accurate measurement due to broken or faded marks.

Long Answer Questions (4–5 Marks Each)

Q1: Describe an activity to measure the length of a curved line.

Ans: Use a thread to trace the curved line. Mark the start and end on the thread. Then stretch the thread along a ruler to measure the length.

Explanation: To measure the length of a curved line, we cannot use a ruler or scale directly as they are straight tools. Instead, we use a non-stretchable thread and a scale. Here’s a step-by-step activity to measure a curved line accurately:

Materials Required:
A non-stretchable thread (like cotton or wool thread), a ruler or a metre scale, a pencil, and a sheet with a curved line drawn on it.

Procedure:

1. Place the thread at the starting point of the curved line (label it as point A).
2. Carefully lay the thread along the curve, gently pressing it down with your fingers so that it follows the exact path of the line. Be sure not to stretch the thread.
3. Mark the thread at the end point of the curved line (label it as point B) using a pen or simply pinch it with your fingers.
4. Now straighten the thread and place it along a ruler or scale.
5. Measure the length between the two marked points on the thread using the scale.

Result:
The measurement you read from the ruler is the length of the curved line.

Precautions:

• Use a thin and flexible thread for better accuracy.
• Do not stretch the thread, as it may give a false reading.
• Place the thread carefully exactly along the line, not inside or outside it.
• Use a precise scale with clear markings.

This activity helps students understand that measurement tools must be suitable for the object being measured, and that curved lengths require indirect methods of measurement.

Q2: Explain different types of motion with examples.

Ans: Rectilinear motion: Car moving on a straight road. Circular motion: Hands of a clock. Periodic motion: Swing of a pendulum. Some objects can have more than one type at the same time.

Explanation: Objects around us are often in motion. Motion means a change in the position of an object with time. There are different types of motion depending on how an object moves. The three basic types of motion are:

1. Rectilinear Motion:
In rectilinear motion, an object moves in a straight line. The direction of motion does not change. This type of motion is also called linear motion.
Examples: A train moving on a straight railway track, a ball rolling down a ramp, a child sliding down a straight slide.

2. Circular Motion:
In circular motion, an object moves along a circular path. The object continuously changes direction, but stays at a fixed distance from a central point. It involves rotation or revolution.
Examples: The hands of a clock moving in a circle, a stone tied to a string being whirled in the air, the Earth revolving around the Sun.

3. Periodic Motion:
Periodic motion is the motion that repeats itself at regular intervals of time. The movement goes back and forth or up and down in a fixed pattern.
Examples: The swinging of a pendulum, motion of a child on a swing, the movement of a clock’s second hand (also circular and periodic).

Note: Some objects can exhibit more than one type of motion at the same time. For example, a ceiling fan shows circular and periodic motion, and a moving car’s wheels rotate in circular motion while the car itself moves in rectilinear motion.

Q3: How can we ensure accuracy while measuring length using a ruler?

Ans: 1. Start from zero mark. 2. Avoid parallax error. 3. Keep the ruler straight and flat. 4. Use a ruler with clear markings.

Multiple Choice Questions (MCQs)

Q1. The standard unit of length is:
(a) Centimetre
(b) Kilometre
(c) Millimetre
(d) Metre
Answer: (d) Metre

Q2. Motion of a pendulum is:
(a) Rectilinear
(b) Circular
(c) Periodic
(d) Non-periodic
Answer: (c) Periodic

Q3. Which instrument is best suited to measure the thickness of a coin?
(a) Metre scale
(b) Measuring tape
(c) Ruler
(d) Vernier calliper
Answer: (d) Vernier calliper

Q4. A car moving in a straight road shows:
(a) Circular motion
(b) Periodic motion
(c) Rotational motion
(d) Rectilinear motion
Answer: (d) Rectilinear motion

Q5. The motion of the Earth around the Sun is:
(a) Rectilinear
(b) Periodic and Circular
(c) Vibrational
(d) Irregular
Answer: (b) Periodic and Circular

Q6. Which of the following is a non-standard unit?
(a) Handspan
(b) Metre
(c) Centimetre
(d) Millimetre
Answer: (a) Handspan

Q7. A freely falling stone shows:
(a) Rectilinear motion
(b) Periodic motion
(c) Circular motion
(d) Oscillatory motion
Answer: (a) Rectilinear motion

Q8. Which tool can best measure the length of a curved path?
(a) Divider
(b) Measuring tape
(c) Ruler
(d) Protractor
Answer: (b) Measuring tape

Q9. The motion of the tip of the second hand in a clock is:
(a) Rectilinear
(b) Circular
(c) Periodic
(d) Both (b) and (c)
Answer: (d) Both (b) and (c)

Q10. Which motion repeats itself after regular intervals?
(a) Rectilinear
(b) Circular
(c) Periodic
(d) Irregular
Answer: (c) Periodic

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Assertion and Reasoning Questions

Q1.
Assertion (A): Metre is a standard unit of length.
Reason (R): Standard units are accepted all over the world.
Answer: (a) Both A and R are true and R is the correct explanation of A

Q2.
Assertion (A): A measuring tape is used for measuring large curved lengths.
Reason (R): Measuring tapes are rigid and straight.
Answer: (c) A is true but R is false

Q3.
Assertion (A): Rectilinear motion is motion along a straight line.
Reason (R): A car turning on a circular track is an example of rectilinear motion.
Answer: (c) A is true but R is false

Q4.
Assertion (A): Periodic motion is repeated after regular intervals.
Reason (R): A child running in a playground shows periodic motion.
Answer: (c) A is true but R is false

Q5.
Assertion (A): Non-uniform motion means covering equal distances in equal time.
Reason (R): Walking at different speeds is an example of non-uniform motion.
Answer: (c) A is false but R is true

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Passage-Based Questions

Passage:
A boy used a scale to measure the length of a stick. He placed the stick with one end at 2 cm and the other end at 27 cm on the scale.

Q1. What is the actual length of the stick?
Answer: 27 cm – 2 cm = 25 cm

Q2. Why didn’t he place the stick at the 0 mark?
Answer: The edge of the scale might be broken or worn out.

Q3. What precaution should be taken while using a scale?
Answer: Avoid parallax error by keeping your eye level with the scale, and start from 0 or note the starting mark.

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🔄 Match the Column

Match the types of motion with examples:

Column A	Column B
(i) Rectilinear	(a) Pendulum swing
(ii) Circular	(b) Clock hands
(iii) Periodic	(c) Train on track

Correct Match:
(i) – c, (ii) – b, (iii) – a

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💬 Think and Answer / Activity Corner

Q1. Why are standard units of measurement important?

Q2. Try to measure the length of a curved banana. What tool will you use and why?

Q3. Identify at least 3 examples of rectilinear motion around you.

Q4. Is the movement of a child on a swing uniform or non-uniform? Why?

Q5. Create a table comparing rectilinear, circular, and periodic motion with definitions and one example each.

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Also check

• Extra Questions for Class 6 Science Chapter 5: Measurement of Length and Motion
• Extra Questions for Class 6 Science Chapter 4: Exploring Magnets
• Extra Questions for Class 6 Science Chapter 3: Mindful Eating
• Extra Questions for Class 6 Science Chapter 2: Diversity in the Living World
• Extra Questions for Class 6 Science Chapter 1: The Wonderful World of Science

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Chapter Summary

This chapter introduces the concepts of measurement, standard units, and motion. It explains how to measure the length of curved and straight objects using appropriate tools, defines standard units like metre and centimetre, and discusses types of motion such as rectilinear, circular, and periodic. It also teaches the importance of using correct units and methods for accurate measurement.

Learning Outcomes

• Understand the concept of measurement and need for standard units.
• Use standard units like metre, centimetre, and millimetre for length.
• Measure curved lines using a thread and scale.
• Identify different types of motion—rectilinear, circular, and periodic.
• Differentiate between uniform and non-uniform motion.

Key Terms & Definitions

Measurement: The comparison of an unknown quantity with a known standard unit.
Metre: The standard unit of length in the metric system.
Centimetre: A smaller unit of length; 100 cm = 1 metre.
Millimetre: Smallest commonly used metric unit; 10 mm = 1 cm.
Motion: The change in position of a body with time.
Rectilinear Motion: Motion along a straight line.
Circular Motion: Motion in a circular path.
Periodic Motion: Motion that repeats at regular intervals.
Uniform Motion: Equal distance covered in equal time intervals.
Non-uniform Motion: Unequal distance covered in equal time intervals.

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