CBSE Class 6 Science Important Questions Chapter 5 - Measurement of Length and Motion

1. What is the need for standard units of measurement?
Ans: Standard units provide a common reference for measuring quantities, ensuring consistency and accuracy. Without standard units, measurements could vary, leading to confusion and errors, especially in fields like science, engineering, and trade.

2. What are the SI units of measurement, and why are they used?
Ans: The SI (International System of Units) provides globally accepted standard units. The metre (m) is the SI unit for length, allowing measurements to be consistent and universally understood, making scientific and everyday measurements reliable.

3. Name some tools used to measure length and describe when to use each.

Ans: 

• Ruler: Used for small, straight measurements, such as on paper.

• Measuring Tape: Ideal for measuring longer or flexible surfaces, like fabric or curved items.

• Metre Stick: Useful for measuring larger, straight distances in classroom or laboratory settings.

4. How do we measure the length of a curved line?
Ans: To measure a curved line, place a thread along the curve, then straighten the thread and measure its length against a ruler. This method gives the total length of the curved line accurately.

5. Define motion and explain its significance in science.
Ans: Motion is the change in position of an object over time. Understanding motion is important because it helps in studying how objects move, predicting their future positions, and applying these concepts in physics, engineering, and daily life.

6. What are the main types of motion? Give examples of each.

Ans: 

• Linear Motion: Movement in a straight line, like a car driving down a road.

• Circular Motion: Movement along a circular path, like the hands of a clock.

• Periodic Motion: Motion that repeats at regular intervals, like a swinging pendulum.

7. How is periodic motion different from linear motion?
Ans: Periodic motion repeats at regular intervals, often following a set pattern, like a pendulum. Linear motion, however, is a straight path from one point to another and does not necessarily repeat.

8. Can an object have more than one type of motion? Explain with an example.
Ans: Yes, an object can show multiple motions. For instance, a rolling wheel shows both circular motion (rotation around its axle) and linear motion (movement along a road).

9. Explain the term 'linear motion' and give two examples.
Ans: Linear motion refers to movement in a straight line. Examples include a car driving on a straight road and a ball thrown directly forward.

10. What is circular motion? Describe it with an example.
Ans: Circular motion is movement along a circular path. An example is the movement of the Earth around the Sun, which follows a nearly circular orbit.

11. What is periodic motion, and where can we observe it?
Ans: Periodic motion is a motion that repeats itself at regular intervals. Examples include a pendulum in a clock and the vibrations of a guitar string when plucked.

12. Why is it helpful to estimate a length before measuring?
Ans: Estimation gives a rough idea of size, which can help in planning and preparing for exact measurement. For instance, estimating room size before moving furniture helps decide placement and avoids repeated measuring.

13. How is measurement used in daily life? Give three examples.

Ans: 

• Cooking: Measuring ingredients ensures accurate recipes.

• Travelling: Distance measurements help in planning routes and calculating travel times.

• Construction: Accurate measurement is crucial for building structures correctly and safely.

14. How can we improve accuracy in measuring lengths?
Ans: To measure accurately, use appropriate tools, avoid parallax errors by looking straight at the measurement markings, and measure twice if needed to confirm the length.

15. Describe an activity to identify types of motion in your surroundings.
Ans: Observe different objects and classify their motion types:

• Linear Motion: Watch cars moving on a straight road.

• Circular Motion: Observe a ceiling fan.

• Periodic Motion: Check a clock's pendulum.
  

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