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Reliable and Valid
Three titres within 0.1 cm^3 are precise. If you used the wrong indicator, they can still be invalid. An outlier: check the burette, do not hide it. Accuracy is closeness to the true value (a standard).
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Reliable and Valid
What is it?
Three titres within 0.1 cm^3 are precise. If you used the wrong indicator, they can still be invalid. An outlier: check the burette, do not hide it. Accuracy is closeness to the true value (a standard).
In simple words
- Three titres within 0.1 cm^3 are precise.
- repeats
- right method
- reliable = close repeats
Important terms
Reliable And Valid: Three titres within 0.1 cm^3 are precise. If you used the wrong indicator, they can still be invalid. An outlier: check the burette, do not hide it. Accuracy is closeness to the true value (a standard).
What you should learn
- Define and explain reliable and valid.
- Apply reliable and valid to a focused FBISE question.
- Check the answer for correct terms, evidence, working, and units.
Examples
- repeats
- right method
- reliable = close repeats
CORE UNDERSTANDING
Three titres within 0.1 cm^3 are precise. If you used the wrong indicator, they can still be invalid. An outlier: check the burette, do not hide it. Accuracy is closeness to the true value (a standard).
EXAM APPLICATION
State the correct term, connect it to the chapter rule or evidence, and use a clear example or calculation.
Recommended for Class 9
Full school-level explanation
Three titres within 0.1 cm^3 are precise. If you used the wrong indicator, they can still be invalid. An outlier: check the burette, do not hide it. Accuracy is closeness to the true value (a standard).
Learn the idea, then use it:
WHAT — RELIABLE AND VALID
Three titres within 0.1 cm^3 are precise. If you used the wrong indicator, they can still be invalid. An outlier: check the burette, do not hide it. Accuracy is closeness to the true value (a standard).
HOW — Use the idea
Identify what is given, select this topic's rule or evidence, apply it one step at a time, and check the result.
CORE UNDERSTANDING
Three titres within 0.1 cm^3 are precise. If you used the wrong indicator, they can still be invalid. An outlier: check the burette, do not hide it. Accuracy is closeness to the true value (a standard).
Remember
- repeats
- right method
- reliable = close repeats
Examples
- repeats
- right method
- reliable = close repeats
- RELIABLE AND VALID: Three titres within 0.1 cm^3 are precise. If you used the wrong indicator, they can still be invalid. An outlier: check
EXAM APPLICATION
State the correct term, connect it to the chapter rule or evidence, and use a clear example or calculation.
Remember
- correct term
- chapter link
- clear application
Examples
- Define first
- Show the rule or evidence
- Check units, labels, and conclusion
Remember
- repeats
- right method
- reliable = close repeats
- keep the ideas separate
- repeats
- right method
- reliable = close repeats
- correct term
Deeper understanding
Go beyond memorising Reliable and Valid. Connect the definition to reasons, relationships, exceptions, and exam wording.
Common mistakes
Exam focus
Core Idea
Key Points
Simple Check
How to Answer
Exam focus
Quick revision
- repeats
- right method
- reliable = close repeats
- keep the ideas separate
- Reliable And Valid: Three titres within 0.1 cm^3 are precise. If you used the wrong indicator, they can still be invalid
- WHAT — RELIABLE AND VALID: Three titres within 0.1 cm^3 are precise. If you used the wrong indicator, they can still be invalid
Do not merge reliable and valid with a neighbouring idea that uses a different definition, rule, or method.
For long answers on Reliable and Valid: define clearly → explain the main parts → give one example → state one exam caution.
Exam Focus
Exam Focus
Important points
- repeats
- right method
- reliable = close repeats
- keep the ideas separate
Important formulas
- repeats
- right method
- reliable = close repeats
Common exam traps
- Do not merge reliable and valid with a neighbouring idea that uses a different definition, rule, or method.
- Do not invent a formula, fact, unit, or diagram label that the chapter does not support.
Long question structure
Definition → key parts → example → exam caution
Common Mistakes
Common Mistakes
- Mistake
Do not merge reliable and valid with a neighbouring idea that uses a different definition, rule, or method.
- Mistake
Do not invent a formula, fact, unit, or diagram label that the chapter does not support.
- Mistake
Do not merge reliable and valid with a neighbouring idea that uses a different definition, rule, or method.
Revision Zone
60-Second Revision
Quick cues from this topic — use them for last-minute revision.
repeats
right method
reliable = close repeats
keep the ideas separate
Three titres within 0.1 cm^3 are precise. If you used the wrong indicator, they can still be invalid. An outlier: check the burette, do not hide it. Accuracy is
reliable = close repeats
- Definition
- Three titres within 0.1 cm^3 are precise. If you used the wrong indicator, they can still be invalid. An outlier: check the burette, do not hide it. Accuracy is
- Formula
- reliable = close repeats
- Example
- repeats
- Critical warning
- Do not merge reliable and valid with a neighbouring idea that uses a different definition, rule, or method.
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Exam Practice
Define
Q1. Define Reliable and Valid.
Explain
Q2. Explain: CORE UNDERSTANDING.
Example
Q3. Give one clear example of Reliable and Valid and say why it fits.
Mistake
Q4. State one common mistake students make about Reliable and Valid.
Exam note
Q5. Write a short exam note on Reliable and Valid: definition, two points, one example.
Sources & References
School-standard facts for Matric and Intermediate. Original explanations — not copied from textbooks.