 NCERT Solutions for Class 6 Science Chapter 7 Question Answers of Motion and Measurement of Distances in Hindi and English.

## Class 6 Science Chapter 7 NCERT Solutions

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

Land transport: Bus, train, motorbike.
Water transport: Boat, ship, steamer.
Air Transport: Aeroplane, Helicopter.

#### Question 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______________.

(i) One metre is 100 cm.
(ii) Five kilometre is 5000 m.
(iii)Motion of a child on a swing is periodic motion.
(iv)Motion of the needle of a sewing machine is periodic motion.
(v) Motion of wheel of a bicycle is circular motion.

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

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 International System of Units (SI Units).

#### Question 4. Arrange the following lengths in their increasing magnitude: 1 metre, 1 centimetre, 1 kilometre, 1 millimetre.

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.

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

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

We know that 1 m = 1/1000 km
So, 3250 m = 3250/1000 km = 3.25 km

##### 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?

The length of the needle = 33.1 cm – 3.0 cm = 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.

Similarity : Both show a circular motion.
Difference : Bicycle shows a rectilinear motion whereas a ceiling fan does not.