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

CBSE Class 6 Science 

Chapter 10 :  Motion and Measurement of Distances

                   NCERT Solutions                          

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

Answer:
Land: Bus, car
Water:  Boat, ship
Air : Aeroplane, Helicopter

2. 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______________.

Answer:
(i) 100.
(ii) 5000
(iii) Periodic motion
(iv) Periodic motion
(v)  Circular motion

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

Answer:
We cannot use footstep as a standard unit of length because the size of the foot varies from person to person.

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:

1m = 100cm

1.65m = 1.65 X 100cm = 165cm

1m = 1000mm

1.65m = 1.65 X 1000 = 1650mm

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

Answer:

Hence the distance between Radha's home and school is 3.25km

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:
Length of the needle = 33.1 - 3 cm = 30.1cm

8. Write the similarities and differences between the motion of a bicycle and a ceiling fan that has been switched on.

Answer:
The motion of the wheels of the bicycle and that of the leaves of the fan are similar. Both are in circular motion. But in the case of bicycle, the bicycle moves in a straight path when the wheel is in circular motion. Hence it has both circular and rectilinear motion. In the case of fan, there is no movement to the fan when the leaves rotates. Hence it has only circular motion

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:
The elastic measuring tape is stretchable. Hence we use elastic measuring table we get different answers depending on the force we use to stretch the tape

10. Give two examples of periodic motion.

Answer:
Oscillations of a pendulum and motion of a child sitting in swing are examples of periodic motion