# Here we have given NCERT Solutions for Class 6 Science Chapter 10 Motion and Measurement of Distances.

 Board CBSE Textbook NCERT Class Class 6 Subject Science Chapter Chapter 10 Chapter Name Motion and Measurement of Distances Number of Questions Solved 10 Category NCERT Solutions

## NCERT Solutions for Class 6 Science Chapter 10 Motion and Measurement of Distances

NCERT TEXTBOOK EXERCISES
(Page 106)

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

• Land — Train, bus, motor bike, car
• Water — Ship, boat
• Air — Aeroplane, helicopter.

Question 2.
Fill in the blanks:

1. One meter is ………………………………. cm.
2. Five kilometer is ………………………………. m.
3. Motion of a child on a swing is ………………………………. .
4. Motion of the needle of a sewing machine is ………………………………. .
5. Motion of wheel of a bicycle is ………………………………. .

1. 100
2. 5000
3. Periodic (oscillatory) motion
4. Periodic motion
5. Circular motion

Question 3.
Why can a pace or a footstep not be used as a standard unit of length?
Pace or footstep as a unit of length is not suitable, as its measurement is not fixed and varies from person to person. Since a standard unit must be similar in all places of world and in all weathers, it should not depend upon body parts and natural phenomenon.

Question 4.
Arrange the following lengths in their increasing magnitude: 1 meter, 1 centimeter, 1 kilometer, 1 millimeter.
1 millimeter, 1 centimeter, 1 meter, 1 kilometer.

Question 5.
The height of a person is 1.65 m. Express it into cm and mm.
Given that, height of person = 1.65 m We have to find out’

(a) height in cm
(b) height in mm.

(a) We know that,
1 m = 100 cm
Hence, 1.65 m = 1.65 × 100 cm
= 165 cm. Ans.

(b)
Again we know that,
1 m = 1000 mm
Hence, 1.65 m = 1.65 × 1000 mm
= 1650 mm. Ans.

Or

We know that,
1 cm = 10 nun
Hence, 165 cm = 165 × 10 mm
= 1650 mm. Ans.

Question 6.
The distance between Radha’s home and her school is 3250 m. Express this distance into km.
Given that,
Distance between Radha’s home and her school = 3250 m We have to find out distance in km.
We know that,
1000 m = 1 km
hence, 3250 m = 32501000 km
= 3.250 km. Ans.

Question 7.
While measuring the length of a 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?
Given that,
Reading at starting end = 3.0 cm
Reading at other end = 33.1 cm
We know that,
Length of the object = (Reading at other end – Reading at startingend)
Hence, length of the needle = 33.1 — 3.0 cm
= 30.1 cm. Ans.

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

• Similarity : Both the wheels of a bicycle and a ceiling fan execute a circular motion on a fixed axis.
• Dissimilarity : A bicycle also executes a rectilinear motion while a fan does not execute such motion.

Question 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 measured with such a tape?
Elastic substances have no fixed length. Their length is altered when they are stretched by different forces. Hence, an elastic tape will not give a correct measurement, as it will always give a reading greater than actual one. Since it is very much difficult to measure the amount by which it alters the measure we cannot tell correctly a distance by measuring with an elastic tape.

Question 10.
Give two examples of periodic motion. 