Motion and Measurement of Distance NCERT Solutions

NCERT Solutions for  Motion and Measurement of Distances Class 6 Science Chapter 10are given below to help students solve all the questions of the textbook exercise. SimplyAcad has collated the best NCERT solutions provided in the simplest language for better understanding of the concepts dealt in the chapter. Students can use the given solutions to make brief notes for last minute revisions.

NCERT Solutions For Class 6 Motion and Measurement of Distances

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

Answer: Land transport: Bus, train

Water transport: Boat, ship

Air transport: Aeroplane, Helicopter

Question 2: Fill in the blanks:

(i) One metre is __________ cm.

(ii) Five kilometres is __________ m.

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

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

(v) Motion of the wheel of a bicycle is___________.

Answer. (i) One metre is 100 cm.

(ii) Five kilometres is 5000 m.

Explanation:
We know that 1 km = 1000 m

∴ 5 km = 1000 × 5 = 5000 m

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

Explanation: Motion which repeats itself after certain intervals is called periodic motion. Since the motion of a swing also repeats after regular intervals so, the motion of the child on a swing is periodic.

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

Explanation: The needle of a sewing machine, while moving up and down, repeats its motion after regular intervals so it possesses periodic motion.

(v) Motion of the wheel of a bicycle is circular.

Explanation: When an object moves in such a way that its distance from a fixed point remains the same, it is said to have circular motion. Since, the wheel of a bicycle rotates about its central part which remains fixed as the bicycle moves hence, the wheel possesses circular motion.

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

Answer: A pace or a footstep not be used as a standard unit of length because the size of pace and footstep vary from person to person. This will lead to confusion while measuring the lengths by different persons. We should use standard units like the International System of Units (SI Units).

Question 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.

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

Answer: We know that 1 metre = 100 cm and 1 metre = 1000 mm

So, 1.65 m = 1.65 × 100 = 165 cm

and 1.65 m = 1.65 × 1000 = 1650 mm

Thus, height of person in cm = 165 cm

And height of person in mm = 1650 mm

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

Answer: The distance between Radha’s home and her school is 3250 m.

Question 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 knitting needle is the difference between two readings.

Thus, length of knitting needle = 33.1− 3.0 = 30.1 cm

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

Answer: Similarities between the motion of a bicycle and a ceiling fan:

(i) The blades of a fan and the wheels of a bicycle are fixed at a point.

(ii) Both have circular motion about their respective fixed points.

Differences between the motion of a bicycle and a ceiling fan:

(i) A bicycle has linear motion, whereas the blades of a ceiling fan do not have linear motion.

(ii) The motion of the blades of a fan is periodic, whereas the motion of a bicycle is rectilinear motion.

Question 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: An elastic measuring tape is stretchable. It cannot be used to measure distances because the length of the tape may change on stretching. As a result, the measured length would not be correct.

If you measure the length of an object twice using an elastic tape, then you may get different values of the same length each time. This is because elastic tapes are stretchable.

Question 10: Give two examples of periodic motion.

Answer: Rotation of Earth, Pendulum, vibrating wire of guitar, etc.