NCERT Solutions for Class 6 Science Chapter 7 - Motion and Measurement of Distances

1. Give two examples each, of modes of transport used on land, water and air. 

Ans: 

The examples for different modes of transport are as below,

• Transportation mode on land – car and bus

• Transportation mode on water – ship and ferry

• Transportation mode on air – aeroplane and helicopter

2. Fill in the blanks: 

1. One metre is ______________ cm. 

Ans: 100

2. Five kilometres is ______________ m. 

Ans: 5000

3. Motion of a child on a swing is ______________. 

Ans: Periodic motion

4. Motion of the needle of a sewing machine is ______________. 

Ans: Oscillatory motion

5. Motion of the wheel of a bicycle is______________.

Ans: Circular motion

3. Why can a pace or a footstep not be used as a standard unit of length? 

Ans: A pace or a footstep cannot be used as a standard unit of length because the length of a footstep is different for different people. Since the size of the pace of different people is different, the same length measured by two people with their pace or footstep would be different. Also, a standard unit must not change with time and space, irrespective of the person doing the measurement. Thus we cannot use a pace or a footstep not be used as a standard unit of length.

4. Arrange the following lengths in their increasing magnitude: 1  metre, 1 centimetre, 1  kilometre, 1  millimetre.

Ans: It is known that millimetre (mm) is the smallest and kilometre (km) is the largest.

Also, 1 cm = 10 mm; 1m = 100cm; 1km=1000m.

Based on this, the arrangement observed is -  1mm<1cm<1m<1km 

5. The height of a person is 1.65 m. Express it into cm and mm. 

Ans: Given: Height =1.65m

It is know that,

• 1 cm = 10 mm

• 1m = 100 cm

• 1m = 100x10mm

• 1m = 1000mm

Now, first convert the given height in metres to centimetres (cm) and millimetres (mm).

• In centimetre - (1.65 x 100) cm = 165cm

• In millimetre - (1.65 x 1000) = 1650mm

Thus, the height of the person in cm is 165 cm and in mm is 1650 mm.

6. The distance between Radha's home and her school is  3250m. Express this distance into km. 

Ans: 

Given: Distance between Radha’s home and school =3250m

It is known that, 

1km=1000m

1m= 1/1000 km

Now, converting m into km:

3250m = (1/1000 x 3250)km

3250 m =3.25km

Thus, the distance between Radha's home and her school in km is 3.25km

7. While measuring the length of a knitting needle, the reading of the scale at one end is 3.0cm and at the other end is 33.1cm. What is the length of the needle?

Ans: The length of the needle can be found by subtracting the readings at the two ends of the needle.

Hence, the length of the needle = 33.1 cm - 3cm = 30.1cm.

The length of the needle is 30.1 cm.

8. Write the similarities and differences between the motion of a bicycle and a ceiling fan that has been switched on. 

Ans: 

• Similarity – Both the motion of a bicycle, specifically its wheel, and that of a ceiling fan represent a circular motion, since both objects are moving about a circular path from a fixed point.

• Difference – For a bicycle, along with the circular motion of its wheels, it also exhibits translational motion, moving linearly or in a straight line. While the ceiling fan only shows circular motion.

9. Why can you not use an elastic measuring tape to measure distance? What would be some of the problems you would meet in telling someone about a distance you measured with such a tape? 

Ans: 

• The main property of an elastic material is its elasticity, where it can stretch when pulled and deform based on the force used during the pull and contraction. 

• Since elastic measuring tapes are stretchable, the length being measured can show different readings depending on the applied force during the pulling. This means that the length of the tape will change each time during stretching. 

• Thus while measuring the distance with an elastic measuring tape we will get different values for the same distance being measured.

• Also if the same distance is being measured by two people using the elastic tape while applying different forces, they would get different measurements.

10. Give two examples of periodic motion.

Ans: Periodic motion is the motion that repeats itself after regular intervals of time.

Examples of periodic motion – Swinging pendulum, Motion of a rocking chair, Motion of a swing, Hands of a clock, Revolution of Earth around Sun and Moon around Earth.

NCERT Motion and Measurement of Distance Class 6 Quick Overview of Detailed Structure of Topics

Class 6 Motion and Measurement of Distance – Important Points

• Standard measures are those measures that are the same all over the world. 

• The 12th General Conference on Weight and Measures in October 1960 adopted the International system of units. “The System International Units” is the set of units that were established to maintain uniformity all over the world.

• The standard unit of length is Metre.

• One metre is divided into 100 equal divisions, called centimetres. Further, one centimetre has ten equal divisions, called millimetres. Hence

• 1 millimetre = 100 centimetres

• 1 centimetre = 10 millimetres

• Kilometre is a unit of length that is used for measuring large distances for which a metre is not a convenient unit. We define a larger used for measurement for long distances. 

1 km = 1000 m.

• Types of Motion

• Rectilinear Motion: Motion along a straight line, such as a car moving on a straight road.

• Circular Motion: Motion along a circular path, like a stone tied to a string and swung in a circle.

• Periodic Motion: Motion that repeats itself at regular intervals, such as the swinging of a pendulum.

Benefits of Referring to Vedantu’s Class 6 Science Chapter 7 Question Answer

• Motion and Measurement of Distances Class 6 Questions and Answers clearly explain the fundamental concepts of motion, types of motion, and the importance of measurement in science.

• Class 6 Motion and Measurement Solutions explains various measurement techniques, including standard units and tools like rulers, measuring tapes, and clocks.

• Motion and Measurement of Distance covers different types of motion, such as rectilinear, circular, and periodic motion, helping students understand these concepts with real-life examples.

• Motion and Measurement of Distances PDF assists students in completing their last-minute revision efficiently and effectively, ensuring they cover all key concepts before exams.

• Class 6 Science Chapter 7 Question Answer includes practice questions and exercises on motion and measurement that allow students to test their understanding of the concepts discussed in the chapter.

• By referring to Class 6 Science Chapter 7 PDF Question Answer, students can prepare effectively for exams as the solutions cover all the topics and questions likely to be asked in the assessments.

Important Study Materials for Class 6 Science  Chapter 7: Motion and Measurement of Distances

Conclusion 

Vedantu’s NCERT Solutions for Class 6 Science Chapter 7: Motion and Measurement of Distances are an essential tool for students. These solutions cover key concepts such as different types of motion, measurement techniques, and standard units of measurement. Understanding these basics is crucial, as it forms the foundation for future science topics. Last year's question paper included around 10 questions from this chapter, highlighting its importance. By using Vedantu's solutions, students can effectively grasp these concepts, practice thoroughly, and improve their exam performance.

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