NCERT Class VI Science Solutions: Chapter 10-Motion and Measurement of Distance Part 2

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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. What is the length of the needle?

Answer:

The length of the needle

Question 8:

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

Answer:

Similarity: Both show a circular motion.

Difference: Bicycle shows a rectilinear motion whereas a ceiling fan does not.

This image shows bicycle

Image of Bicycle

Question 9:

Why could you not use an elastic measuring tape to measure distance? What would be some of the problems you would meet in telling someone about a distance you measured with an elastic tape?

Answer:

Since the tape is stretchable, its will show the same measurements for different lengths. Therefore we cannot use it as measuring tape. While measuring a distance, we need to tell someone how much tape has been stretched which is difficult to measure. It leads to incorrect measurements.

As showing in Image is a result for elastic measuring tape

Elastic Measuring Tape

Question 10:

Give two examples of periodic motion.

Answer:

Rotation of Earth, Pendulum, vibrating wire of guitar, etc.

As showing in images is a periodic motion.

Periodic Motion

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