NCERT Solutions for Class 6 Science Chapter 10 imparts knowledge on the topics involved in Chapter 10 Motion and Measurement of Distances

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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

Ans :

Land- Train., Bus

Water- Ship, Boat

Air- Helicopter, Airplane

2. Fill in the blanks:

(i) One metre is ______________ cm.

Ans : 100

(ii) Five kilometer is ______________ m.

Ans : 5000

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

Ans : periodic (oscillatory) motion

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

Ans : periodic oscillatory

(v) Motion of wheel of a bicycle is______________.

Ans : circular

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

Ans :

Pace or a footstep cannot be used as a standard unit of length because it varies from person to person.

4. Arrange the following lengths in their increasing magnitude:

1 metre, 1 centimeter, 1 kilometer, 1 millimeter

Ans:

Ascending order of length:

1 millimetre < 1 centimetre < 1 metre < 1 kilometre

5. The height of a person is 1.65 m. Express it into cm and mm.

Ans :

(a). 1.65 m, as one metre = 100 cm

= 1.65 x 100 cm = 165 cm

(b). 65 x 100 x 10 mm = 1650 mm.

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

Ans :

1km = 1000 m

Hence, 3250 m = 3.25 kms

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 :

Length of the needle = 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.

Ans :

(i) Similarity: Both the wheel of a bicycle and a ceiling fan exhibit motion on a fixed axis.

(ii) Dissimilarity: Bicycle moves forward thus executes rectilinear motion but fan does not show such 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?

Ans :

An elastic measuring tape gives incorrect length of the distance between two points.

Reasons:

(i) The length of the elastic tape varies and depends upon the force by which it is stretched.

(ii) Measurement would vary between 2 or 3 readings even when measured by the same person and by the same elastic tape.

(iii) Measurement would also vary if different persons measure the same distance

10. Give two examples of periodic motion.

Ans :

a. Motion of swing/motion of earth round the sun.

b. Oscillations of a pendulum.

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