All questions of Motion and Measurement of Distances for Class 6 Exam

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To convert meters to centimeters, multiply by 100 (since 1 meter = 100 centimeters). Thus, 2.5 meters × 100 = 250 centimeters.

Understanding Periodic Motion
Periodic motion is defined as motion that repeats itself at regular intervals of time. This concept can be observed in various daily activities, one of which is the movement of fan blades.
Why Fan Blades Exhibit Periodic Motion
- Repetitive Movement:
The blades of a fan rotate around a fixed axis, completing a full revolution in a consistent timeframe. This consistent repetition characterizes periodic motion.
- Time Interval:
Each complete cycle of the fan blades returning to their original position occurs within a specific time interval, such as every second or two seconds, depending on the fan's speed.
- Predictable Pattern:
The motion can be predicted, as the blades will always return to the same position after a set duration. This predictability is a hallmark of periodic motion.
Comparing Other Types of Motion
- Non-Periodic Motion:
Unlike periodic motion, non-periodic motion does not follow a consistent pattern or interval. An example would be a person walking randomly in a park.
- Rectilinear Motion:
This type of motion involves movement in a straight line. Fan blades do not move in a straight line; they rotate in a circular path.
- Conclusion:
Since the movement of fan blades is consistent, repetitive, and predictable, it is classified as periodic motion.
Final Thoughts
In summary, the movement of fan blades is categorized as periodic motion because they rotate in a consistent manner, completing cycles at regular intervals. This understanding helps in recognizing how various objects move in our daily lives!

Explanation:

Introduction:
The hectare is a unit of measurement commonly used to measure the area of large land areas such as fields and farms. It is commonly used in agriculture and land management.

Explanation:
The correct answer is option 'C', which states that the hectare can be used to measure the area of crop land.

What is a hectare?
A hectare is a unit of measurement for area. It is equal to 10,000 square meters or 2.471 acres. It is a commonly used unit in agriculture and land management.

Area of Crop Land:
The area of crop land refers to the total land area used for growing crops. This includes fields, farms, and plantations where crops are cultivated. The hectare is often used to measure the area of crop land because it provides a convenient and standardized unit of measurement.

Why is the hectare used to measure crop land?
1. Standardization: Using the hectare as a unit of measurement ensures that land areas are measured consistently. This allows for accurate comparisons and calculations when managing and planning crop production.

2. Convenient Size: The hectare is a suitable unit for measuring large land areas like crop fields. It provides a manageable size that is easier to work with compared to square meters or acres.

3. Agricultural Planning: Farmers, agronomists, and land managers often need to know the exact size of their crop land for planning purposes. The hectare provides a precise measurement that can be used for various calculations, such as determining seed requirements, estimating yield potential, and optimizing resource allocation.

4. International Use: The hectare is widely recognized and used internationally. It is part of the metric system and is accepted as a standard unit of measurement in many countries. This makes it easier to communicate and compare land area measurements across different regions.

Conclusion:
In conclusion, the hectare is commonly used to measure the area of crop land. Its standardized size, convenience, and international recognition make it an ideal unit of measurement for agricultural purposes.

To convert meters to millimeters, multiply by 1000 (since 1 meter = 1000 millimeters). Thus, 0.75 meters × 1000 = 750 millimeters.

To find the speed in meters per second, first convert kilometers to meters (120 km × 1000 = 120,000 meters). Then convert hours to seconds (2 hours × 3600 seconds = 7200 seconds). Average speed = Total distance / Total time = 120,000 meters / 7200 seconds ≈ 16.67 m/s.