ICSE ICSE Class 8 - CISCE Question Bank Solutions

What is a density bottle? How is it used to find the density of a liquid?

Define the term relative density of a substance.

What is the unit of relative density?

Distinguish between density and relative density.

Explain the meaning of the statement

‘Relative density of aluminium is 2.7’.

How does the density of a body and that of a liquid determine whether the body will float or sink into that liquid?

A cork piece floats on water surface while an iron nail sinks in it. Explain the reason.

Which of the following will sink or float on water? (Density of water = 1 g Cm^-3)
(a) body A having density of 500 kg m^-3

Which of the following will sink or float on water? (Density of water = 1 g Cm^-3) body B having density 2520 kg m^-3

Which of the following will sink or float on water? (Density of water = 1 g Cm^-3)

 body C having density 1100 kg m^-3

Which of the following will sink or float on water? (Density of water = 1 g Cm^-3)

body D having density 0.85 g m^-3

What is the law of floatation?

The density of water is 1.0 g Cm^-3. The density of iron is 7.8 × 10″3 g Cm^-3. The density of mercury is 13.6 g Cm^-3.
Ans the following:
Will a piece of iron float or sink in water?

The density of water is 1.0 g Cm^-3. The density of iron is 7.8 × 10″3 g Cm^-3. The density of mercury is 13.6 g Cm^-3.
Answer the following:
Will a piece of iron float or sink in mercury?

The diagram given below show a body floating in three different liquids. A, B and C at different levels.
(a) In which liquid does the body experience the greatest buoyant force?
(b) Which liquid has the least density?
(c) Which liquid has the highest density?

For a floating body, how is its weight related to the buoyant force?

Why does a piece of ice float on water?

Explain why an iron needle sinks in water, but a ship made of iron floats on water.

State the energy changes that occur in a watch spring while it unwinds.

State the energy changes in the following while in use An electric bulb.