MCQ: Choose the correct answer(s) 🧪

• 1. The mass of air can be measured with:
• a balance ⚖️ a graduated cylinder 🧪 a calculator 🧮

• 2. Density \( \mathsf{\rho} \) equals:
• \( \mathsf{\rho = \dfrac{m}{V}} \) \( \mathsf{\rho = \dfrac{V}{m}} \) (volume divided by mass) \( \mathsf{\rho = m \times V} \) (mass multiplied by volume)

• 3. At 25 °C, the density of air is:
• 1.2 kg/L 1.2 g/L 1.2 mg/L

• 4. To remove 1 L of air from a balloon, use:
• a water tank 🛁 a 1 L graduated cylinder 🧪 a deflater and a tube 🎈

• 5. A classroom can contain:
• about 2 kg of air about 20 kg of air about 200 kg of air

• 6. To calculate the volume of a box, use the formula:
• \( \mathsf{V = h + L + l} \) \( \mathsf{V = h \times L \times l} \) \( \mathsf{V = \displaystyle\frac{h \times (L + l)}{2}} \)
• With:
  V : volume
  h : height
  l : width
  L : length

📊 RESULT: