📏 Measurement Interactive Practice
Learn volume, area, density, relative density and numericals with animated answers, calculators, flash cards and instant quiz practice.
📌 Key Concepts of Measurement
🥛 Volume
Volume tells how much space a substance occupies. Liquids like milk can be measured using a measuring cylinder or measuring cup.
📐 Area
Area is the surface covered by an object. Regular objects use formulas, while irregular objects can be measured using graph paper.
⚖️ Density
Density tells how much mass is present in a unit volume of a substance.
💧 Relative Density
Relative density compares the density of a substance with the density of water.
Important Formulae
Area of Circle = πr² Area of Rectangle = length × breadth Density = Mass / Volume Speed in m/s = km/h × 5/18Density
Density = Mass / Volume
📝 Subjective Questions
Click the buttons to reveal each answer.
1. How can we measure the volume of milk contained in a cup?
We can measure it using a measuring cylinder or measuring cup. Pour the milk into the measuring cylinder and note the reading.
2. Describe a method to measure the area of the following:
a. A regular shaped object
Measure its dimensions such as length, breadth, radius, etc. and use the appropriate formula.
Example: Area = length × breadth.
Example: Area = length × breadth.
b. An irregular shaped object
Place the object on graph paper and trace its outline. Count full squares and include squares that are half or more than half.
Total area = sum of these squares in cm².
Total area = sum of these squares in cm².
3. Explain the procedure to determine the density of an irregular solid.
- Measure mass using a balance.
- Note initial water level in measuring cylinder.
- Immerse the solid and note final level.
- Volume = Final − Initial using water displacement method.
- Density = Mass / Volume.
4. Distinguish between density and relative density.
| Density | Relative Density |
|---|---|
| Mass per unit volume | Ratio of density of substance to water |
| Formula: Mass / Volume | Ratio of densities |
| Has unit such as kg/m³ or g/cm³ | No unit |
| Absolute value | Comparative value |
🔢 Numericals: Step-by-Step Solutions
1. The radius of a circle is 7 mm. Find its area.
Formula: Area = πr²
π = 22/7, r = 7 mm
Area = (22/7) × 7 × 7
Area = 154 mm²
2. A metallic sphere weighs 450 g. Volume = 50 cm³. Find density.
Formula: Density = Mass / Volume
Mass = 450 g, Volume = 50 cm³
Density = 450 / 50
Density = 9 g/cm³
3. Convert 27 km/h into m/s.
Conversion formula: km/h × (5/18)
Speed = 27 × (5/18)
= (27 × 5) / 18
Speed = 7.5 m/s
🧮 Practice Calculator
Density Calculator
Circle Area Calculator
Speed Converter
These calculators help students verify numerical answers quickly.
✅ Quick Concept Quiz
Select the correct answer and click submit to check your score instantly.
