# Density

## Trending Questions

**Q.**

The density of a piece of clay is 1.8 in CGS system of units . The corresponding value in SI unit of system is?

**Q.**

The density of aluminium is 2.7 g cm−3. Express it in kg m−3.

**Q.**

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

**Q.**

The density of brass is 8.4 g cm−3. What do you mean by this statement?

**Q.**

The mass of an empty density bottle is $30g$, it is $75g$ when filled completely with water and $65g$ when filled completely with a liquid. Find: a) volume of density bottle b) density of liquid and c) relative density of liquid

**Q.**

Define the term density of a substance.

**Q.**

How do you calculate the linear density of a string?

**Q.**

How is the apparent weight of the floating body 0?

**Q.**The measured values of mass, length, breadth and thickness of a rectangular block are 39.3g, 5.12 cm, 2.56 cm and 0.37 cm respectively. Find the maximum permissible percentage error in the determination of the density of the material of the block.

**Q.**

A piece of wood of mass 150 g has a volume of 200 cm3.Find the density of wood in

(a) C.G.S.unit (b) S.I unit

**Q.**

What do you mean by this statement :

The density of iron is 7.8gm cm^{-3}

**Q.**

A piece of iron of density 7.8×103 kg m−3 and volume 100 cm3 is totally immersed in water (ρ = 1000 kg m−3). Calculate its apparent weight in water.

6 N

1 N

6.8 N

7 N

**Q.**

Arrange the following substances in order of their increasing density:

Iron, Cork, Brass, Water, Mercury.

**Q.**

Write true or false for each statement:

(a) Equal volumes of the two different substances have equal masses.

(b) The density of a piece of brass will change by changing its size or shape.

(c) The density of a liquid decreases with an increase in its temperature.

(d) Relative density of water is 1.0.

(e) Relative density of a substance is expressed in g cm−3.

(f) When a body is immersed in a liquid, the buoyant force experienced by the body is equal to the volume of the displaced by it.

(g) A body experiences the same buoyant force while floating in water or alcohol.

(h) A body experiences the same buoyant force when it floats or sinks in water.

(i) A body floats in a liquid when its weight becomes equal to the weight of the liquid displaced by its submerged part.

(j) A body while floating sinks in a liquid of low density than in high density.

**Q.**

How will you determine the density of irregular solids that are insoluble in water

**Q.**

The density of alcohol is 600 kg m−3. Express it in g cm−3.

**Q.**

A piece of iron sinks into water while a wooden piece float. Why is it so ?

**Q.**

Iron sinks in water and floats in mercury.

Density of Iron - 7.6g/cm3

Density of Water - 1g/cm3

Density of Mercury - 13.7g/cm3

True

False

**Q.**

The diagram given below shows 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?

**Q.**

The density of gold is 19.5 g cm-3 and that of silver is

10.5 g cm-3. The correct statement is:

- The volume of certain mass of gold is more than the volume of equal mass of silver.
- Equal volumes of gold and silver have equal masses.
- The mass of certain volume of gold is more than the mass of equal volume of silver.
- Equal masses of gold and silver have equal volumes.

**Q.**

A given quantity of a liquid is heated. Which of the following quantity will vary and how?

(a) mass (b) volume and (c) density.

**Q.**

The dimensions of a hall are 10× 7m× 5m. If the density of air is 1.11 kgm−3. Find the mass of air in the hall.

**Q.**

Differentiate between a graduated cylinder and a eureka can.

**Q.**What is neutral buoyancy ?

**Q.**

Show the following in the form of a flowchart.

Measuring the density of a liquid with unknown mass and volume.

**Q.**

Why does a piece of ice float on water?

**Q.**Volume is the three dimensional space occupied by a solid, liquid or gas and it is measured by the unit

- m3
- m
- m2

**Q.**

Why is the buoyant force equal in different liquids with same object?

**Q.**

Ice floats over water although it is solid. Why?

**Q.**

calculate the density and relative density of a brine solution

mass of empty density bottle= 22 grams

mass of bottle + water = 50 grams

mass of bottle + brine solution = 54 grams