#### CBSE Science Class 6 Motion and Measurement of Distances NCERT Solution

NCERT Solutions for Class 6 Science Chapter 7 Motion and Measurement of Distances guide you in your CBSE Class 6 exam preparation. These NCERT Solutions will assist you in understanding the important topics which will be helpful in your future studies. In order to score good marks, students are advised to study the answers thoroughly. A proper understanding of this chapter will further help the students with a few other chapters in higher classes as well. The solutions are provided by the subject experts and are accurate. Every question is explained concisely in simple language for a better understanding of the students. They can use these for reference.

The NCERT Solutions for Class 6 Science Chapter 7 has questions and answers on topics like different modes of transport used to go from one place to another, measurement, SI units of measurement, the concept of metre, motion in a straight line, rectilinear motion, circular motion and periodic motion. This study material has detailed answers to all the exercise questions provided in the NCERT textbook, which will help you clear your doubts.

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

**Answer:**

On land : Car, Train

In water : Boat, Ship

In air : Aeroplane, Helicopter

2. Fill in the blanks :

(i) One metre is ________ cm.

(ii) Five kilometre is _____ m.

(iii) Motion of a child on a swing is ________ .

(iv) Motion of the needle of a sewing machine is _______ .

(v) Motion of wheel of a bicycle is _________ .

**Answer:**

(i) 100

(ii) 5000

(iii) Periodic motion

(iv) Periodic motion

(v) Circular motion

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

**Answer:**

We cannot use pace or a footstep as standard unit of length as the size of the foot and the footstep will not be the same for every individual. Thus the measurement will not be the same for different people.

4. Arrange the following lengths in their increasing magnitude:

1 metre, 1 centimetre, 1 kilometre, 1 millimetre.

**Answer:**

1 millimetre, 1 centimetre, 1 metre, 1 kilometre.

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

**Answer:**

165 cm, 1650 mm.

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

**Answer:**

3.25 km.

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

**Answer:**

33.1 cm - 3.0 cm = 30.1 cm.

Therefore,

Length of the needle = 30.1 cm.

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

**Answer:**

*Similarities : *Wheel of a bicycle and ceiling fan (when on) both show circular motion.

*Differences : *Cycle moves in rectilinear motion, ceiling fan does not move in rectilinear motion.

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

**Answer:**

Elastic tape will not give accurate measurement because it stretches in length when pulled and reduces in size when not stretched. While telling the measurement taken with an elastic tape. We have to tell whether the tape was stretched and by how much. This is very difficuly.

10. Give two examples of periodic motion.

**Answer:**

(i) Pendulum (ii) Child on the swing