NCERT Solution for Class 6 Chapter 5 - Measurement of Length and Motion

Class 6 Science Chapter 5 - Measurement of Length and Motion: Additional Questions

The additional questions of Class 6 Science Chapter 5 – Measurement of Length and Motion are designed to challenge students beyond the standard exercises. These questions help strengthen problem-solving skills, encourage critical thinking, and provide extra practice on key concepts such as measuring lengths, calculating distances, and understanding motion. Using these questions, students can confidently prepare for exams while applying concepts to practical scenarios.

Q1: Paheli moves on a straight road from point A to point C. She takes 20 minutes to cover a certain distance AB and 30 minutes to cover the rest of the distance BC. She then turns back and takes 30 minutes to cover the distance CB and 20 minutes to cover the rest of the distance to her starting point. She makes 5 rounds on the road the same way. Paheli concludes that her motion is

(a) only rectilinear motion.

(b) only periodic motion.

(c) rectilinear and periodic both.

(d) neither rectilinear nor periodic.

Answer:

Paheli is travelling in a straight path between point A and point C and vice versa, taking the same route several times again and again. Her motion is a straight line (motion along a straight line) since she travels along a straight line (the road) between A and C and back. Since she repeats the same movement (going between A and C and back to A) 5 times, her movement is also periodic because periodic movement repeats after a definite period of time. Accordingly, the movement of Paheli is rectilinear and periodic.

Hence, the correct answer is: (c) both periodic and rectilinear.

Q2: While travelling in a train, it appears that the trees near the track are moving, whereas co-passengers appear to be stationary. Explain the reason.

Answer:

When you are in a train, the trees around the tracks appear to be moving, yet the people inside the train appear to be standing motionless. It occurs due to a phenomenon known as relative motion. Your fellow passengers and you are travelling at the same speed and direction in the same train. And, so, in your opinion, your friends are not moving; they are motionless. But the trees outside are stuck to the ground. The trees appear to be moving backwards as the train is moving past them. In plain words, the appearance of something that is in motion is determined by where one is and at what point of observation. Objects that move with you will appear still, and objects that are passing you will appear to be moving.

Q3: Three students measured the length of a corridor and reported their measurements. The values of their measurements were different. What could be the reason for the difference in their measurements? (Mention any three)

Answer:

Three students who measure the length of a corridor might not record similar results due to the following reasons:

• Measurement Method: They could have applied various methods or tools in order to measure the length. As an example, one might have used a tape measure, the next a meter scale and the third a different length measuring device. Various tools possess varying precisions.
• Starting and Ending Points: It is possible that they did not measure so precisely at the same starting and ending points of the corridor. The slightest change in their starting or ending point can influence the measure.
• Human Factor: The result may vary due to mistakes in the reading of the scale, bending or stretching of the measuring tape or failure to hold the tape straight during measurement.

Class 6 Science Chapter 5 - Measurement of Length and Motion - Topics

The fifth chapter of Class 6 Science, Measurement of Length and Motion, exposes students to the fundamental ideas of distance measurement and movement of objects. It covers common units of measure, measurement techniques and various forms of movement in an easy and practical manner.

5.1 How do we measure?

Measurement is the relationship between an unknown amount and a known reference value. In everyday life, we measure length with the help of different devices such as scales, measuring tape, or rulers. Hand spans or footsteps used in ancient times were not accurate. In science, a standard procedure is desired. This subject brings forth the accuracy of measurement.

5.2 Standard Units

The standard units are units that are permanently defined to be used by everybody in the world. The standard unit of length is the metre (m). Standard units eliminate confusion and give reliable measurements. Smaller distances are represented using sub-units such as centimetre (cm) and millimetre (mm). This part discusses the reason why a global standard is significant.

5.3 Correct Way of Measuring Length

When we measure, we need to employ the right procedures in order to obtain good results. The scale must be lined up along the object, and the eye line must be horizontal so as not to cause parallax error. Damaged or imperfect scales must not be used. This section assists the learners in knowing how to measure.

5.4 Measuring the length of a curved line

As opposed to straight lines, curved lines cannot be measured with an ordinary ruler. A strip of thread or a piece of string is drawn on the curve, and it is measured on a scale. In this section, a non-linear path measurement using simple tools will be described.

5.5 Describing Position

Position can be defined as the place of an object on the basis to a fixed point or with reference. Many times, we define position in terms of directions or coordinates. In science, position must be described accurately when one wants to observe motion or carry out experiments. This subject prepares the ground, which deals with motion and place.

5.6 Moving Things

In this section, the concept of motion is discussed. Things that appear to shift position with time are referred to as moving. Examples would be cars, pets, or even the hands of a clock. It assists the students in learning the role of movement in human daily lives and its importance of knowing motion.

5.7 Types of Motion

Different types of motion include rectilinear (straight line), circular, as well as periodic motion. A car travelling on the road depicts rectilinear motion, and the four-blade fan rotating in a circular motion. Periodic motion takes place after a certain interval and then repeats itself, such as a swinging pendulum. This subject classifies motion in order to develop more knowledge.

Approach to solve the Class 6 Science Chapter 5 - Measurement of Length and Motion

Class 6, chapter 5: Measurement of Length and Motion presents students with the idea of measurement of objects or motion in everyday life. In order to answer questions in an effective manner, the students should adopt a structured method. This approach ensures students grasp both theoretical and practical aspects of measurement and motion, helping them answer questions accurately in exams.

1. Start by reading the chapter carefully and learning about the standard units of length, measuring tools, vernier calliper, ruler, measuring tape and concepts of motion, speed, and distance.
2. Pay attention to significant concepts such as metre, centimetre, kilometre, millimetre, distance, displacement, speed, and uniform and non-uniform movement.
3. Relate the measurement and motion concepts with real-life examples, not only to measure the height of a door, the length of a table, or note the speed of a ball rolling, but also to notice how the ball rolls.
4. Solve numerical questions involving addition, subtraction, or conversion of units, as well as calculating speed using the formula: Distance = Speed x Time
5. Try to label diagrams wherever necessary, e.g. displacement, scales of measurement, or tracks of moving bodies.
6. Go through the NCERT Solutions and answer other questions to strengthen the knowledge and to know how to present the answers.
7. Try to carry out easy experiments such as measuring the length of various objects with the usage of different items or timing some moving objects to reinforce practice knowledge.

Benefits of NCERT Solutions for Class 6 Science Curiosity Chapter 5

The NCERT Solutions Class 6 Science Chapter 5 - Measurement and Motion of the Curiosity textbook offers the student an easy way of understanding complex concepts through clear and step-by-step explanations. The Class 6 science chapter 5 Measurement of Length and Motion question answers are based on the current NCERT Class 6 Science syllabus (2025-26) and assist students in enhancing their understanding of important scientific concepts on measurement and motion. Through such NCERT solutions, students can be better prepared for exams and have good analytical and problem-solving skills in Science.

1. Proper and Conceptual Answers
The answers to the solutions are well organised, clear and concept-based based and enable the student to understand complicated scientific concepts in an easy manner.

2. In sync with the New NCERT Book Curiosity
These solutions are based on the most recent Class 6 Science textbook, Curiosity, revised for the 2025-26 academic year by NEP 2020, under the National Curriculum Framework.

3. Builds Strong Foundational Understanding

Chapter 5 prepares the foundations of scientific thinking. The solutions also help students to learn relevant concepts using familiar explanations and examples.

4. Useful for Homework and Exam Preparation
These solutions will help the students to have clear confidence in the class assignments, school tests and training on important questions effectively.

5. Encourages Critical Thinking
The solutions are not rote-learning-based because they induce the use of thinking and reasoning capabilities, as well as the ability to apply knowledge.

6. Simplifies Complex Concepts

Complex ideas are simplified into simpler components using diagrams and step-by-step explanations without making learning tedious or a waste of time.

7. Enhances Self-Study
These solutions are very useful in cases of students who need to revise or prepare without external support, considering it more like a self-help manual.

NCERT Solutions for Class 6 Science: Chapter-wise

The NCERT Solutions to Class 6 Science give answers to all the chapters in the recent NCERT textbook in detail, step-by-step. All these solutions enable students to develop sound fundamentals, be well prepared in exams, and learn concepts easily. It is easy to revise and/or access any topic in a matter of seconds through chapter-wise links.

NCERT Solutions for Class 6: Subject-wise

Also Check NCERT Books and NCERT Syllabus here

• NCERT Book
• NCERT Books Class 6
• NCERT Syllabus Class 6
• NCERT 6 Science Syllabus