Relative density, short types

📝 Very Short Answer Type Questions

1. Define the term density.

Density is Mass Volume

2. What are the units of density in (i) CGS and (ii) SI system?

(i) g/cm³, (ii) kg/m³

3. Express the relationship between the CGS and SI units of density.

1 g/cm³ = 1000 kg/m³

4. The density of iron is 7800 kg/m³. What do you understand by this statement?

1 m³ of iron has a mass of 7800 kg

5. Write the density of water at 4°C in SI unit.

1000 kg/m³

6. How are the (i) mass, (ii) volume, and (iii) density of a substance affected with increase in temperature?

(i) unchanged, (ii) increases, (iii) decreases

7. Complete the following sentences:
(a) Mass = ______ × density
(b) SI unit of density = ______
(c) Density of water is = ______

(a) volume
(b) kg/m³
(c) 1000 kg/m³

8. What is the unit of relative density?

It has no unit.

9. A body weighs W₁ gf in air and W₂ gf when completely immersed in water. Find:
(i) Volume of the body
(ii) Upthrust on the body
(iii) Relative density of material of the body

(i) V = (W₁ - W₂) cm³
(ii) Upthrust = W₁ - W₂ gf
(iii) R.D. = W₁ / (W₁ - W₂)