# ICSE Worksheet for chapter-9 Floatation and Relative Density class 9

## Find ICSE Worksheet for chapter-9 Floatation and Relative Density class 9

CLASS-9

BOARD: ICSE

Physics Worksheet - 9

TOPIC: Floatation and Relative Density

For other ICSE Worksheet for class 9 Science check out main page of Physics Wallah.

#### SUMMARY

• Principle Of Floatation
• Verification Of Principle Of Floatation
• Applications On Floatation

#### SECTION 1 – OBJECTIVE

1. The unit of relative density is:
1. kg m-3
2. g cm-3
3. g litre-1
4. It does not have a unit.
2. The relative density of silver is 10.8. Its density is:
1. 10.8
2. 10.8 kg m-3
3. 10.8x103 kg m-3
4. 10.8x103 g cm-3
3. The relative density of a solid is 0.6. It floats in water with
1. Whole of its volume inside water (B) 60% volume inside water surface
2. 60% volume outside water surface
3. 40% volume inside water
4. A wooden cube of side 10 cm has mass 700 g. It floats in water with
1. Half of its volume inside water
2. 3 cm height above the water surface
3. 7 cm height above the water surface
4. Just inside the water surface
5. The stem of hydrometer is made narrow because it:
1. Reduces its cost
2. increases its sensitivity
3. Will not tilt sideways
4. has a better shape
6. A hydrometer floats with half of its stem outside the water surface.
It is now placed in alcohol (R.D = 0.8). Hydrometer floats:
1. With stem at same position
2. With more stem inside alcohol
3. With more stem outside alcohol
4. In tilted position
7. Calculate the mass of air in a room of length and breadth 6m x 5m and height 4m.
The density of air is 1.26 kg m-3
1. 156.2 kg
2. 151.2 kg
3. 50 kg
4. 124.34 kg
8. The density of copper is 8.83 g/cm3. Express it in kg/m3.
1. 8824 kg/m3
2. 8930 kg/m3
3. 8830 kg/m3
4. 8946 kg/m3
9. The unit of specific gravity density is:
1. g/cm3
2. kg/cm3
3. m3/kg
4. no unit
10. 10. The density of water is:
1. (A) 1000 g/cm3
2. (B) 1 kg/m3
3. (C) 1 g/cm3
4. (D) None of these

SECTION 2 – SUBJECTIVE

1. What is the significance of Plimsoll lines drawn on a ship?
2. State the principle of floatation. Name an instrument based on this principle. Give at least one use of the instrument that you describe.
3. Give briefly the principle, construction and mode of action of a submarine.
4. The following observations were made while finding relative density of a metal.
• Weight of metal in water = 15 gf
• Weight of metal in air = 20 gf
• Find relative density of metal
5. A body weighs 20 gf in air and 18.0 gf in water. Calculate the relative density of the material of the body.

### Solutions: to worksheet-9 Topic- Floatation and Relative Density class 9SUBJECTIVE

6.RD of metal = 4

7.RD = 2