Topics and Sub Topics in Class 6 Science Chapter 7 Motion and Measurement of Distances:

Prepare for your CBSE Class 6 Science exam with NCERT Solutions for Chapter 7: Motion and Measurement of Distances. Crafted by subject experts, these solutions are designed to help you understand important topics easily. With clear explanations and concise language, they serve as valuable references for scoring well in exams. Invest time in mastering this chapter, as it lays the foundation for future studies and aids in understanding subsequent chapters.

Exercise Questions

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

Ans:

Land:

1. Car
2. Bicycle

Water:

1. Ship
2. Canoe

Air:

1. Airplane
2. Hot air balloon

Q 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______________.

Ans:

(i) One metre is 100 cm.

(ii) Five kilometres is 5000 m.

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

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

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

Q 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.

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

Ans: 1 millimetre, 1 centimetre, 1 metre, 1 kilometre

Q 5. The height of a person is 1.65 meters. In centimeters, it's 165 cm (1 meter = 100 cm), and in millimeters, it's 1650 mm (1 cm = 10 mm).

Ans: A person's height of 1.65 meters is 165 centimeters or 1650 millimeters.

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

Ans: The distance between Radha's home and her school is 3250 meters. To express this distance in kilometers, we divide by 1000 because there are 1000 meters in a kilometer. So, 3250 m÷1000=3.25 km3250m÷1000=3.25km.

Q 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 needle = Reading at other end − Reading at one end

Length of needle = 33.1 – 3 = 30.1 cm

=30.1 cm

So, the length of the knitting needle is 30.1 centimeters.

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

Ans:

Similarities:

1. Both involve circular motion.
2. Both rely on a source of energy to initiate and sustain motion.

Differences:

1. Direction of Motion: A bicycle moves in a straight line (unless turning), while a ceiling fan rotates in a circular motion.
2. A bicycle is primarily used for transportation or recreational purposes, while a ceiling fan is used for ventilation or cooling.

Q 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:

1. Stretching: Rubber stretches easily, which can make measurements wrong because the tape gets longer as you use it.
2. Not Steady: Rubber tapes aren't strong like metal or fiberglass ones. This makes it harder to measure accurately, especially for longer distances.
3. Wear and Tear: Rubber tapes wear out quickly, so they become less accurate over time as they get damaged or bent.

Q 10. Give two examples of periodic motion.

Ans:

1. Breathing: The chest's rhythmic rise and fall during breathing demonstrate periodic motion.
2. Heartbeat: The heart's steady pulsing, driving blood flow, is another example of periodic motion.

Important topics covered in NCERT Solutions for Class 6 Science Chapter 7

Motion and Measurement of Distances

• Story of transport
• How wide is this desk?
• Some measurements
• Standard units of measurements
• Correct measurement of length
• Measuring the length of a curved line
• Moving things around us
• Types of motion