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

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

Answer:

1. Mode of Transport on Land – Bus, Railways.
2. Mode of Transport on Water – Speed Boats, Cargo ships.
3. Mode of Air Transport – Airplanes, Helicopter.

2. Fill in the blanks:

(i) One metre is ______________ cm.

Answer: 100.

(ii) Five kilometre is ______________ m.

Answer: 5000.

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

Answer: periodic motion

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

Answer: periodic motion

(v) Motion of wheel of a bicycle is______________.

Answer: circular motion

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

Answer: Size of foot for every individual is different, therefore their foot step will also be different. If it is used as unit of length, measurement will vary from person to person. Thus, pace or footstep is not used as a standard unit of length.

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: We know that, 1 m = 100 cm = 1000 mm.

So, 1.65 m = 1.65 x 100 = 165 cm

1.65 x 1000 = 1650 m.

Hence, the height of a person is 1.65 m = 165 cm = 1650 m.

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

Answer: We know that, 1 km = 1000 m or 1000 m = 1 km.

So, 3250 1/1000= 3.25 km.

Hence, the distance between Radha’s home and her school is 3250 m which is equal to 3.25 km.

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 ?

Answer: Here, the reading of one end is 3.0 cm and at other end is 33.1 cm.
So, Length of Needle = Higher reading – lower reading
                                                = 33.1 cm – 3.0 cm = 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 – Bicycle and Ceiling fan both perform circular motion.
• Difference – Bicycle can move in rectilinear motion but ceiling fan can 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 measured with such a tape ?

Answer: Elastic tape is stretchable in nature. If distance is measured with elastics tape it will not give correct reading of measurement. It is not possible to tell that where tape was stretched, how much it was stretched.

10. Give two examples of periodic motion.

Answer: Bouncing ball, rocking chair, pendulum are the examples of periodic motion.

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Download free NCERT textbook class 6 Science – Chapter 10 Motion and Measurement of Distances