Introduction
Before trying to attempt to answer the NCERT exercise questions, you should have a thorough understanding of class 6 Science chapter 7 i.e. ‘Motion and Measurement of Distances‘.
If you haven’t understood the chapter yet, then worry not you can go through it easily and develop a crystal clear understanding of various concepts from our notes whose link has been provided below.
NCERT Exercise Questions & Answers
Que. 1 Give two examples of each, of the modes of transport used on land, water and air.
Ans. 1 Example of transportation used on
i) Land: cars and trains
ii) Water: ships and boats
iii) Air: aeroplane and helicopter
Que. 2 Fill in the blanks:
(i) One metre is _____ cm.
(ii) Five kilometres is_____m.
(iii) The motion of a child on a swing is _____.
(iv) The motion of the needle of a sewing machine is _____.
(v) Motion of the wheel of a bicycle is_____.
Ans. 2 (i) One metre is 100 cm.
(ii) Five kilometres is 5000 m.
(iii) The motion of a child on a swing is periodic.
(iv) The motion of the needle of a sewing machine is periodic.
(v) The motion of the wheel of a bicycle is circular.
Que. 3 Why can a pace or a footstep not be used as a standard unit of length?
Ans. 3 A pace or a footstep can’t be used as a standard unit of length because the length of a footstep varies from person to person.
Que. 4 Arrange the following lengths in their increasing order of magnitude:
1 metre, 1 centimetre, 1 kilometre,1 millimetre.
Ans. 4 The increasing order of the following lengths is:
1 millimetre <1 centimetre < 1 metre < 1 kilometre
Que. 5 The height of a person is 1.65 m. Express it into cm and mm.
Ans. 5 As we all know 1m = 100cm = 1000mm
therefore, 1.65m is equal to (1.65×100) 165 cms and 1.65 m is equal to (1.65x1000) 1650 mm.
Que. 6 The distance between Radha’s home and her school is 3250 m. Express this
distance into km.
Ans. 6 As we all know 1km = 1000m.
So, 1m = 1/1000 km.
Therefore, the distance between Radha’s home and her school is
3250/1000 = 3.25 km.
Que. 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?
Ans. 7 The length of the needle is
33.1cm- 3.0cm = 30.1 cm.
Que. 8 Write the similarities and differences between the motion of a bicycle and a
ceiling fan that has been switched on.
Ans. 8 Similarity between the motion of a bicycle and a ceiling fan is that both the wheels of the bicycle and the ceiling fan’s blades show circular motion.
The dissimilarity between the motion of a bicycle and a ceiling fan is that a bicycle can exhibit rectilinear motion whereas a ceiling fan can’t.
Que. 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?
Ans. 9 We can’t use a measuring tape made up of elastic material because it will give us inaccurate measurements. The reasons being:
- The elastic material can stretch while measuring distances if too much force is applied to the tape, giving an inaccurate measurement.
- Measuring tape can shrink or expand due to low or high surrounding temperatures giving inaccurate measurements.
Que. 10 Give two examples of periodic motion.
Ans. 10 i) Rotation of Earth around the Sun.
ii) Hour hand of a wall clock.
References & Credits
- Class 6 Science NCERT Textbook.
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