Chapter 5: Measurement of Length and Motion Worksheet
Chapter 5: Measurement of Length and Motion Worksheet
Section A – Multiple Choice Questions
1. What is the SI unit of length?
(a) Centimetre
(b) Metre
(c) Kilometre
(d) Millimetre
Answer: (b) Metre
2. Which of the following is not a standard unit of length?
(a) Metre
(b) Centimetre
(c) Handspan
(d) Kilometre
Answer: (c) Handspan
3. 1 metre is equal to:
(a) 10 cm
(b) 100 cm
(c) 1000 cm
(d) 50 cm
Answer: (b) 100 cm
4. 1 centimetre is equal to:
(a) 10 mm
(b) 100 mm
(c) 1 mm
(d) 1000 mm
Answer: (a) 10 mm
5. Which unit is most suitable for measuring the distance between two cities?
(a) Millimetre
(b) Centimetre
(c) Metre
(d) Kilometre
Answer: (d) Kilometre
6. Which instrument is most suitable for measuring the girth of a tree?
(a) 15-cm ruler
(b) Flexible measuring tape
(c) Metre scale only
(d) Handspan
Answer: (b) Flexible measuring tape
7. While measuring an object with a scale, the eye should be:
(a) Far away from the scale
(b) Directly above the end being measured
(c) Below the scale
(d) At an angle to the scale
Answer: (b) Directly above the end being measured
8. If the zero mark of a scale is broken, we can:
(a) Throw the scale away
(b) Use another full marking and subtract the initial reading
(c) Guess the measurement
(d) Use only the centimetre markings
Answer: (b) Use another full marking and subtract the initial reading
9. A fixed object or point used to describe the position of another object is called a:
(a) Standard unit
(b) Measuring point
(c) Reference point
(d) Motion point
Answer: (c) Reference point
10. An object is said to be in motion when its position changes with respect to a reference point with:
(a) Size
(b) Time
(c) Shape
(d) Weight
Answer: (b) Time
11. A car moving along a straight road shows:
(a) Circular motion
(b) Oscillatory motion
(c) Linear motion
(d) Random motion
Answer: (c) Linear motion
12. The motion of a merry-go-round is an example of:
(a) Linear motion
(b) Circular motion
(c) Oscillatory motion
(d) Straight motion
Answer: (b) Circular motion
13. A swing moving to and fro shows:
(a) Linear motion
(b) Circular motion
(c) Oscillatory motion
(d) No motion
Answer: (c) Oscillatory motion
14. Which of the following can be used to measure a curved line?
(a) Thread
(b) Flexible measuring tape
(c) Both (a) and (b)
(d) Handspan only
Answer: (c) Both (a) and (b)
15. Which statement is correct?
(a) 1 km = 100 m
(b) 1 m = 10 cm
(c) 1 cm = 10 mm
(d) 1 km = 100 cm
Answer: (c) 1 cm = 10 mm
Section B – Fill in the Blanks
1. The SI unit of length is __________.
Answer: metre
2. 1 km = __________ m.
Answer: 1000
3. 1 m = __________ cm.
Answer: 100
4. 1 cm = __________ mm.
Answer: 10
5. A fixed object or point used for describing position is called a __________ point.
Answer: reference
6. Motion along a straight line is called __________ motion.
Answer: linear
7. Motion along a circular path is called __________ motion.
Answer: circular
8. To-and-fro motion about a fixed position is called __________ motion.
Answer: oscillatory
9. A curved line can be measured using a flexible tape or a __________.
Answer: thread
10. A measurement consists of a number and a __________.
Answer: unit
Section C – Match the Following
Column A Column B
1. Distance between two cities (a) Millimetre
2. Length of a pencil (b) Circular motion
3. Thickness of a coin (c) Kilometre
4. Merry-go-round (d) Centimetre
5. Swing (e) Oscillatory motion
6. Car moving on a straight road (f) Reference point
7. Fixed point used to describe position (g) Linear motion
Answers
1 → (c)
2 → (d)
3 → (a)
4 → (b)
5 → (e)
6 → (g)
7 → (f)
Section D – True or False
1. The SI unit of length is metre.
Answer: True
2. Handspan is a standard unit of length.
Answer: False
3. 1 km = 1000 m.
Answer: True
4. 1 m = 10 cm.
Answer: False
5. A car moving on a straight road shows linear motion.
Answer: True
6. A merry-go-round shows circular motion.
Answer: True
7. A swing moving to and fro shows oscillatory motion.
Answer: True
8. Motion can be described without considering a reference point.
Answer: False
9. A curved line can be measured using a thread.
Answer: True
10. 1 cm = 100 mm.
Answer: False
Section E – Very Short Answer Questions
1. What is measurement?
Answer: Measurement is the process of finding the size or length of an object by comparing it with a standard unit.
2. What is the SI unit of length?
Answer: The SI unit of length is metre (m).
3. Why are body parts not suitable as standard units?
Answer: Body parts such as handspan and foot differ in size from person to person, so they do not give uniform measurements.
4. What is a reference point?
Answer: A fixed object or point with respect to which the position or distance of another object is described is called a reference point.
5. What is linear motion?
Answer: Motion of an object along a straight line is called linear motion.
6. What is circular motion?
Answer: Motion of an object along a circular path is called circular motion.
7. What is oscillatory motion?
Answer: To-and-fro motion of an object about a fixed position is called oscillatory motion.
8. What is periodic motion?
Answer: Motion that repeats its path after a fixed interval of time is called periodic motion.
9. How can you measure a curved line using a thread?
Answer: Place the thread along the curved line, mark its ends, straighten it and measure it with a scale.
10. Write two standard units smaller than metre.
Answer: Centimetre and millimetre.
Section F – Short Answer Questions
1. Why do we need standard units of measurement?
Answer: Different people may get different measurements when they use body parts such as handspan or foot. Standard units give the same measurement to different people. Therefore, standard units are needed for accurate and uniform measurement.
2. Explain the correct way of measuring the length of an object.
Answer: Place the scale along the length of the object and keep it in proper contact with the object. Keep the eye directly above the end of the object while taking the reading. Always write the number along with its unit.
3. How can a broken scale be used for measuring length?
Answer: If the zero mark is broken, choose another clear marking as the starting point. Take the reading at both ends of the object and subtract the starting reading from the final reading. For example, if the readings are 1.0 cm and 10.4 cm, the length is 9.4 cm.
4. Explain the importance of a reference point in describing motion.
Answer: A reference point helps us decide whether an object has changed its position. An object is in motion when its position changes with respect to the reference point with time. The same object can be at rest with respect to one reference point and in motion with respect to another.
5. Differentiate between linear, circular and oscillatory motion.
Motion Meaning Example
- Linear Motion along a straight line Car on a straight road
- Circular Motion along a circular path Merry-go-round
- Oscillatory To-and-fro motion about a fixed position Swing
6. Why are flexible measuring tapes useful?
Answer: Flexible measuring tapes can bend according to the shape of an object. They are therefore useful for measuring curved or rounded objects such as the girth of a tree or the size of a person's chest. 7. Convert the following: (a) 3 km into metres (b) 5 m into centimetres (c) 8 cm into millimetres.
Answer:
(a) 3 km = 3000 m
(b) 5 m = 500 cm
(c) 8 cm = 80 mm
Section G – Long Answer Questions
7 Questions 1. Explain the need for standard units of measurement. Describe the SI units of length.
Answer:- In earlier times, people used body parts such as handspan, foot and finger width to measure length. These measurements were not uniform because body parts differ from person to person. Therefore, standard units were developed.
The internationally accepted system is called the International System of Units (SI). The SI unit of length is metre (m).
Important relationships are:
- 1 km = 1000 m
- 1 m = 100 cm
- 1 cm = 10 mm
These units allow people to communicate measurements accurately and uniformly.
2. Explain the correct method of measuring the length of an object with a scale. What should be done if the zero mark is damaged?
Answer:
The scale should be placed along the length of the object and kept in contact with it. The eye should be positioned directly above the end of the object to avoid an incorrect reading.
If the zero mark is damaged, another clear marking can be used as the starting point. The starting reading is then subtracted from the final reading.
For example:
Final reading = 10.4 cm
Starting reading = 1.0 cm
Length = 10.4 − 1.0 = 9.4 cm.
3. Explain how a curved line can be measured.
Answer:- A curved line cannot always be measured directly using a straight ruler. It can be measured with a flexible measuring tape or a thread.
Using a thread:
1. Place the thread carefully along the curved line.
2. Mark the points corresponding to both ends.
3. Remove and straighten the thread.
4. Measure the straightened thread using a scale.
5. Write the measurement with its proper unit.
4. What is a reference point? Explain with an example how it helps us describe the position of an object.
Answer:
A reference point is a fixed object or point with respect to which the position or distance of another object is described.
For example, when Padma travels towards Delhi, a kilometre stone may show Delhi 70 km. This means her position is 70 km from Delhi. If the next stone shows Delhi 60 km, her distance from Delhi has decreased. Here, Delhi is the reference point.
5. Explain the meaning of motion and rest with the help of the example of passengers travelling in a bus.
Answer:- An object is in motion when its position changes with respect to a reference point with time. An object is at rest when its position does not change with respect to the reference point.
Passengers sitting inside a moving bus are at rest with respect to the bus because their positions do not change relative to the bus. However, they are in motion with respect to buildings or trees outside the bus because their positions change relative to them.
Thus, the state of motion or rest depends on the reference point.
6. Explain the different types of motion with suitable examples.
Answer:
(a) Linear Motion
Motion along a straight line is called linear motion.
Example: A car moving on a straight road.
(b) Circular Motion
Motion along a circular path is called circular motion.
Example: A merry-go-round.
(c) Oscillatory Motion
To-and-fro motion about a fixed position is called oscillatory motion.
Example: A swing.
(d) Periodic Motion
Motion that repeats after a fixed interval of time is called periodic motion. Circular and oscillatory motions can be periodic. Chapter 5 Measurement of Length…
7. Write a detailed note on the important concepts of measurement and motion studied in this chapter.
Answer:- Measurement helps us determine the length of an object using a suitable unit. The SI unit of length is metre. Other commonly used units are kilometre, centimetre and millimetre.
The important conversions are:
1 km = 1000 m
1 m = 100 cm
1 cm = 10 mm
A suitable instrument should be selected according to the object being measured. Straight objects can be measured with a ruler or metre scale, while curved objects can be measured using a flexible tape or thread.
To describe the position of an object, we use a reference point. An object is said to be in motion if its position changes with respect to the reference point with time.
The main types of motion are linear, circular and oscillatory motion. Linear motion occurs along a straight line, circular motion occurs along a circular path, and oscillatory motion is a to-and-fro motion about a fixed position.
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