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

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

Class 6 Science Chapter 10 Motion and Measurement of Distances Exercise Questions and Answers

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

  1. Land – Train, bus, motorbike, car
  2. Water – Ship, boat
  3. Air – Aeroplane, helicopter.

Question 2.
Fill in the blanks:

(a) One meter is ______cm.
Answer:
100

(b) Five kilometre is ______ m.
Answer:
5000

(c) Motion of a child on a swing is ______.
Answer:
Periodic motion

(d) Motion of a needle of a sewing machine is ______.
Answer:
Periodic motion

(e) Motion of a wheel of a bicycle is ______.
Answer:
Rotational motion

Question 3.
Why can a pace or a footstep not used as a standard unit of length?
Answer:
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 the world and in all weathers, it should not depend upon body parts and natural phenomena.

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

  • 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.
Answer :
Given that, the height of a 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.

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

Or

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

Question 6.
The distance between Radha’s home and her school is 3250 m. Express this distance into km.
Answer:
We know,
1000 m = 1 km
∴ 3250 m = \frac{1}{1000} × 3250 = 3.250 km
Hence the distance between Radha’s home and her school is 3.250 km.

Question 7.
While measuring the length of a knitting needle, the reading of the scale of one end is 3.0 cm and at the other end is 33.1 cm. What is the length of the needle?
Answer:
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 another end – Reading at starting end)
Hence, length of the needle = 33.1 – 3.0 cm = 30.1 cm.

Question 8.
Write the similarity and dissimilarity between the motion of a bicycle and a ceiling fan that has been switched on.
Answer:

  • Similarity – The motion of the wheel of the bicycle and ceiling fan switched on are the same as both have rotational motion.
  • Dissimilarity – Bicycle moves in a rectilinear motion, i.e. in a straight line. A switched-on ceiling fan has rotational motion as it moves around about its axis.

Question 9.
Why could 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 an elastic tape?
Answer:
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 the 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?
Answer:
Examples of periodic motion are :

  1. The motion of a pendulum.
  2. The motion of a child on a swing.