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Key Measurement Concepts and Common Exam Questions
Measurement Practice Paper for Students
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FAQs on Measurement Practice Paper for Students
1. What is measurement in science?
Measurement in science refers to the process of assigning numbers or values to quantities and phenomena using specific tools and units.
- It helps in accurate observation and comparison.
- Common measured quantities include length, mass, and time.
- Standard units such as SI units ensure global consistency.
2. What are the basic units of measurement?
Basic units of measurement are standardized quantities used to express physical quantities.
- Length – metre (m)
- Mass – kilogram (kg)
- Time – second (s)
- These are part of the International System of Units (SI).
3. Why is it important to have standard units of measurement?
Standard units of measurement provide consistency and accuracy in scientific work.
- They avoid confusion caused by local or non-standard units.
- SI units are accepted worldwide for science and daily life.
- Enable clear communication and comparison of results.
4. What are the main types of measurement errors?
Measurement errors refer to the differences between the measured value and the actual value. Main types include:
- Systematic errors: Repeatable and predictable errors, often due to faulty instruments.
- Random errors: Occur unpredictably, caused by environmental changes or observer variation.
- Gross errors: Major mistakes, such as incorrect reading or recording.
5. What is the difference between accuracy and precision in measurement?
Accuracy describes how close a measured value is to the actual value, while precision refers to how consistently repeated measurements produce the same result.
- High accuracy = close to true value.
- High precision = repeatability, even if not accurate.
6. Name three instruments used to measure length.
Common instruments used for measuring length include:
- Metre scale (ruler)
- Measuring tape
- Vernier callipers
- Each tool gives different levels of accuracy and is used for specific applications.
7. How do you convert kilometres to metres?
To convert kilometres (km) to metres (m), multiply the kilometre value by 1000.
- Formula: metres = kilometres × 1000
- Example: 5 km = 5 × 1000 = 5000 m
8. What precautions should be taken while taking measurements?
Precautionary steps ensure measurements are accurate and reliable:
- Use properly calibrated and undamaged instruments.
- Read measurements at eye level to avoid parallax error.
- Take multiple readings and use the average for higher accuracy.
- Ensure instruments are placed on a stable, even surface.
9. What is parallax error?
Parallax error is a measurement error occurring when an object is viewed from different angles rather than directly in front of the scale.
- Often seen in analogue meters and rulers.
- To avoid parallax error, always read the scale at eye level.
10. State any two differences between mass and weight.
Mass and weight are related but different physical quantities:
- Mass is the amount of matter in a body (measured in kilograms, kg), while weight is the force with which gravity acts on the body (measured in newtons, N).
- Mass remains the same everywhere, but weight varies with the acceleration due to gravity.
11. Define the SI unit of time.
The SI unit of time is the second (s).
- 1 second is defined based on the vibration of caesium atoms in an atomic clock, ensuring high precision.
12. Explain the need for measurement in our daily life.
Measurement is essential in daily life for carrying out tasks accurately and efficiently.
- Used in activities like cooking, buying groceries, travelling, and scientific experiments.
- Helps in planning, construction, and understanding the world around us through standard units.
