# NCERT Solutions for Class 6 Science Chapter 10 Motion And Measurement Of Distances

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Updated at 2021-05-07

## NCERT solutions for class 6 Science Chapter 10 Motion And Measurement Of Distances Exercise

Q1 ) Give two examples each, of modes of transport used on land, water and air.

NCERT Solutions for Class 6 Science Chapter 10 Motion And Measurement Of Distances

(1) Examples of modes of transport used on land : Bus, car, train, truck

(2) Examples of modes of transport used on water : Ship, boat

(3) Examples of modes of transport used in the air : Aeroplane, helicopter

Q2 ) Q.2 Fill in the blanks:

(i) One metre is ______________ cm.
(ii) Five kilometer 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______________.

NCERT Solutions for Class 6 Science Chapter 10 Motion And Measurement Of Distances

(i) One metre is $100$ cm.

(ii) Five kilometers 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 $circular$ .

Q3 ) Why can a pace or a footstep not be used as a standard unit of length?

NCERT Solutions for Class 6 Science Chapter 10 Motion And Measurement Of Distances

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

Q4 ) Arrange the following lengths in their increasing magnitude: 1 metre, 1 centimeter, 1 kilometer, 1 millimeter.

NCERT Solutions for Class 6 Science Chapter 10 Motion And Measurement Of Distances

Lengths in their increasing magnitude :

1 millimeter < 1 centimeter < 1 metre < 1 kilometer

1 centimeter = 10 millimeter
1 metre = 1000 millimeter
1 kilometer = 1000000 millimeter

Q5 ) The height of a person is 1.65 m. Express it into cm and mm.

NCERT Solutions for Class 6 Science Chapter 10 Motion And Measurement Of Distances

Height of the person = 1.65 m

We know that 1 m = 100 cm

1.65 m = 100 × 1.65 = 165 cm

Again, 1 m = 100 cm = 1000 mm

1.65 m = 1.65 × 1000 = 1650 mm

Thus height of person in cm = 165 cm

And height of person in mm = 1650 mm

Q6 ) The distance between Radha’s home and her school is 3250 m. Express this distance into km.

NCERT Solutions for Class 6 Science Chapter 10 Motion And Measurement Of Distances

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

We know that 1000 m = 1km

1 m = $\frac{1}{1000}$ km

3250 m = $\frac{1×3250}{1000}$ km = 3.25 km

Therefore, distance between Radha’s home and her school is 3.25 km.

Q7 ) 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?

NCERT Solutions for Class 6 Science Chapter 10 Motion And Measurement Of Distances

The length of the knitting needle is the difference between the two readings.

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

Q8 ) Write the similarities and differences between the motion of a bicycle and a ceiling fan that has been switched on.

NCERT Solutions for Class 6 Science Chapter 10 Motion And Measurement Of Distances

Similarity : - Wheels of a bicycle and blades of the ceiling fan both have circular motion.

Difference : - Bicycle move in rectilinear motion, but the fan does not move in rectilinear motion.

Q9 ) 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?

NCERT Solutions for Class 6 Science Chapter 10 Motion And Measurement Of Distances

(1) Elastic tapes are stretchable.

(2) So, the length of an elastic measuring tape will change each time due to stretching. So, it will not give a correct measurement of a distance.

(3) Therefore, we cannot use an elastic measuring tape to measure distance.

(4) While measuring the distance with an elastic tape, we will get different values of the same distance each time.

Q10 ) Give two examples of periodic motion.

NCERT Solutions for Class 6 Science Chapter 10 Motion And Measurement Of Distances

Periodic motion : If the same motion occurs, again and again, it is said to be repetitive motion. Repetitive motion that repeats itself at regular intervals of time is called periodic motion.

EXAMPLES :

(1) Motion of a pendulum.

(2) Motion of a swing.

(3) The motion of Earth around the Sun.

(4) The motion of a rocking chair.

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