Chapter 5. Measurement of Length and Motion Science Curiosity class 6 in English Medium ncert book solutions NCERT Text Book Questions With Answers

Chapter 5. Measurement of Length and Motion

The NCERT Textbook Exercise is designed to help students revise all the important concepts covered in this chapter. The following solutions are prepared according to the latest NCERT Curiosity textbook and CBSE guidelines. Students should first attempt the questions independently and then compare their answers with the solutions provided below.

NCERT Textbook Exercise

Question 1. Fill in the blanks.

(i) The SI unit of length is metre (m).

(ii) The position of an object is described with respect to a reference point.

(iii) Motion along a straight path is called linear motion.

(iv) Motion that repeats itself after equal intervals of time is called periodic motion.

Question 2. State whether the following statements are True (T) or False (F).

(i) Handspan is a standard unit of length.

Answer: False

(ii) A measuring tape can be used to measure curved objects.

Answer: True

(iii) Every moving object always travels in a straight line.

Answer: False

(iv) The Earth rotates about its own axis.

Answer: True

Question 3. Match the following.

Question 4. Why were body parts such as handspan and footstep not considered reliable units of measurement?

Answer:

Body-part measurements were not reliable because the size of hands, feet, and arms differs from person to person. As a result, different people obtained different measurements for the same object. Therefore, standard units of measurement were introduced to ensure accuracy and uniformity.

Question 5. Why is the SI system of units important?

Answer:

The SI system provides standard units that are accepted throughout the world. It ensures that measurements are accurate, uniform, and easily understood everywhere, making scientific work, trade, engineering, and communication more reliable.

Question 6. How can you measure the length of a curved line?

Answer:

Place a thread carefully along the curved line. Mark the two ends of the thread, straighten it, and measure its length using a ruler or metre scale. A flexible measuring tape can also be used for measuring curved objects.

Question 7. What is meant by a reference point? Explain with an example.

Answer:

A reference point is a fixed object or position used to describe the location or motion of another object.

For example, a car may be moving with respect to a tree beside the road, but a passenger sitting inside the car is at rest with respect to the car.

Question 8. Differentiate between rest and motion.

Answer:

Question 9. Explain the different types of motion with one example each.

Answer:

• Linear Motion: Motion along a straight line. Example: A train moving on a straight track.
• Circular Motion: Motion along a circular path. Example: The blades of a ceiling fan.
• Oscillatory Motion: To-and-fro motion about a fixed position. Example: A swinging pendulum.

Question 10. Why should your eye be placed vertically above the scale while taking a measurement?

Answer:

The eye should be placed vertically above the marking to avoid parallax error. Looking at the scale from an angle may result in an incorrect reading and reduce the accuracy of the measurement.

Question 11. The zero mark of a ruler is damaged. Can the ruler still be used for measurement? Explain.

Answer:

Yes. Place one end of the object at another clear marking on the ruler instead of the damaged zero mark. Note the initial and final readings, then subtract the initial reading from the final reading to obtain the correct length of the object.

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