Q1Written answer
Give two examples each, of modes of transport used on land, water and air.
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Worked solution
Land – Train, Bus
Water – Ship, Boat
Air – Helicopter, Aeroplane
NCERT · Class 6 · Science
Chapter 7: Motion and Measurement of Distances
Practice each question, then open the answer or worked solution.
Questions
10 questionsQ2Written answer
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______________.
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Worked solution
(i) One metre is 100 cm.
(ii) Five kilometres is 5000 m.
(iii) Motion of a child on a swing is periodic.
(iv) Motion of the needle of a sewing machine is periodic.
(v) Motion of the wheel of a bicycle is circular.
Q3Written answer
Why can a pace or a footstep not be used as a standard unit of length?
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Worked solution
Pace or a footstep cannot be used as a standard unit of length because it varies from person to person.
Q4Written answer
Arrange the following lengths in their increasing magnitude: 1 metre, 1 centimetre, 1 kilometre, 1 millimetre.
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Worked solution
1 millimetre, 1 centimetre, 1 metre, 1 kilometre
Q5Written answer
The height of a person is 1.65 m. Express it into cm and mm.
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Worked solution
1.65= 165 cm = 1650 mm
Q6Written answer
The distance between Radha’s home and her school is 3250 m. Express this distance in km.
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Worked solution
1km = 1000 m
Hence, 3250 m = 3.25 kms
Q7Written answer
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?
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Worked solution
Length of needle = 33.1 – 3 = 30.1 cm
Q8Written answer
Write the similarities and differences between the motion of a bicycle and a ceiling fan that has been switched on.
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Worked solution
Similarities – The blades of a fan and the wheels of a bicycle show circular motion
Differences – Bicycles move in rectilinear motion, but the fan does not move in rectilinear motion.
Q9Written answer
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?
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Worked solution
An elastic measuring-tape will not give accurate measurements as it stretches in length and reduces in size when stretched. When we express measurements taken with elastic tape, we have to tell whether the tape was stretched. If yes, how much? Hence, it is very difficult to tell the measurement taken from an elastic tape.
Q10Written answer
Give two examples of periodic motion.
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Worked solution
a) A needle of a sewing machine
b) Pendulum
Important topics covered in NCERT Solutions for Class 6 Science Chapter 10 Motion and Measurement of Distances- Story of transport
- How wide is this desk?
- Some measurements
- Standard units of measurements
- Correct measurement of length
- Measuring the length of a curved line
- Moving things around us
- Types of motion
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