i)

The stone displayed water

OR

The stone occupied space

OR

The volume of the stone was added to the water

ii)

The cork would float

OR

The stone acts as a sinker

iii)

The cork will move up again

OR

The cork will float

iv)

Volume = Final Volume - Initial Volume

v)

Density = $\frac{\mathrm{Mass}}{\mathrm{Volume}}$

Density of cork = $\frac{\mathrm{Mass\; of\; cork}}{\mathrm{Volume\; of\; cork}}$

Mass of cork = 4 g

Volume of cork = 2 cm³

Density of cork = $\frac{\mathrm{4\; g}}{2{\mathrm{cm}}^3}$

Density of cork = 2 gcm^-3

vi)

To avoid splashing/spilling of water

(i)

I → Tape measure/Surveyor's tape/Measuring tape/Tape
II → Stop clock/Stop watch
III → Thermometer
IV → Weighing scale / Balance/ Top pan balance
V → Measuring cylinder

(ii)

Use of instruments labelled

I → For measuring lengths/distance
II → For measuring time
III → For measuring temperature
IV → For measuring weight or mass of objects

(iii)

The volume of the liquid in the measuring cylinder is 160 cm³

i)

(α) mass of irregular object (M) in I = 40 g
(β) Volume of water (V₁) in II = 40 cm³
(γ) Volume of water (V₂) in III = 60 cm³

ii)

Volume of the irregular object = 60 cm³ - 40 cm³ = 20 cm³

iii)

Density = $\frac{\mathrm{40\; g}}{\mathrm{20 }{\mathrm{cm}}^3}$ = 2 g/cm³ or 2 gcm^-3

iv)

Instruments for measuring mass of an irregular object

1. Beam balance
2. Top pan balance
3. Electronic balance

iv)

Precautions to be taken in performing the experiment

1. The object should be lowered gently into the water in the cylinder
2. Volume of the liquid should be read from the base of the meniscus or at the eye level
3. The measuring cylinder should be placed on a flat surface