Tag: substances in the surroundings - their states and properties

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Questions Related to substances in the surroundings - their states and properties

Multiple choice chemistry substances in the surroundings - their states and properties measurement of density properties of substances fundamental and derived units

Which one of the following conditions will cause the density of a liquid to decrease?

  1. Adding more of the liquid to the container

  2. Cooling the liquid

  3. Heating the liquid

  4. Dividing the liquid into two equal volumes
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

$Answer: C$

The density of a liquid or any substance is the material property. The density of the liquid cannot be changed by decreasing the amount of liquid. The density can be effected only by heating the liquid which leads to the change in the molecular distance and leads to a change in density.

Multiple choice chemistry substances in the surroundings - their states and properties measurement of density properties of substances fundamental and derived units
Density of a material varies with temperature.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Density of the material is defined as mass per unit volume. Since, volume is temperature dependent, increasing the temperature of the material (with few exceptions) decreases the density of material by increasing its volume. 

Hence, given statement is true.

Multiple choice chemistry substances in the surroundings - their states and properties measurement of density properties of substances fundamental and derived units

Density of a substance is defined as

  1. Density = Mass x Volume

  2. Density = Mass /Volume

  3. Density = Volume Mass

  4. None
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Density of the substance is defined as the ratio of mass of substance to its volume.

$\therefore$  Density of substance     $\rho = \dfrac{M}{V}$.

Multiple choice chemistry substances in the surroundings - their states and properties measurement of density properties of substances fundamental and derived units
The density of silver is 13.6 times greater than that of water.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

We know that, density of silver is $10.5 \times 10^3 \dfrac{kg}{m^3}$ and density of water is $1.00 \times 10^3 \dfrac{kg}{m^3}$.


Therefore, the density of silver is $10.5$ times greater than that of water.

Hence, the given statement is false.

Multiple choice chemistry substances in the surroundings - their states and properties measurement of density properties of substances fundamental and derived units

From below substances which is more dense?

  1. Water

  2. Clay

  3. Wax

  4. none
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
The density of the following substances is:
Wax approximately has a density around $900kg/m^3$
The density of water is $1000kg/m^3$
Density of clay is $1330kg/m^3$

The density of the clay is the maximum of all the three.
Multiple choice chemistry substances in the surroundings - their states and properties measurement of density properties of substances fundamental and derived units

Which of the following is true about the density of a substance?

  1. It is a derived quantity.
  2. The unit of density in SI system is kilogram per metre$^3$.

  3. The density of a substance can be measured if the mass of the substance for a certain volume is known.

  4. Density is a vector quantity
Reveal answer Fill a bubble to check yourself
A,B,C Correct answer
Explanation

Let the mass of the substance be $m$ and its volume be $V$. Then the density of the substance is defined as the ratio of mass to the volume of the body.

Thus the density of a substance can be derived as  $\rho = \dfrac{m}{V}$

SI unit of mass is $kg$ and that of the volume is $m^3$. Thus SI unit of density is  $kg/m^3$.
The density of a substance is a scalar quantity, not a vector quantity as it has magnitude only.
Hence options A, B and C are correct.

Multiple choice chemistry substances in the surroundings - their states and properties measurement of density properties of substances fundamental and derived units

SI unit of density is ________ times its CGS unit.

  1. 1000

  2. 10

  3. 0.1

  4. 0.001
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

SI unit of density $=\dfrac { kg }{ { m }^{ 3 } } =\dfrac { 1000 }{ 10^6 } \dfrac { g }{ cc } $

                             $\dfrac { 1kg }{ { m }^{ 3 } } ={ 10 }^{ -3 }9/cc$

Multiple choice chemistry substances in the surroundings - their states and properties measurement of density properties of substances fundamental and derived units

Which of the following is true about the density of a substance?

  1. It is a derived quantity.
  2. The unit of density in SI system is kilogram per metre$^3$.

  3. The density of a substance can be measured if the mass of the substance for a certain volume is known.

  4. Density is a vector quantity.
Reveal answer Fill a bubble to check yourself
A,B,C Correct answer
Explanation

The density of a substance is defined as the mass of the substance per unit volume of the substance.
$\rho=\dfrac mV$

Its unit is $kg/m^3$

It is a derived quantity as it uses the unit of mass and the unit of length.
The unit of density in the SI system is kilogram per meter $^3$.
The density of a substance can be measured if the mass of the substance for a certain volume is known.

Multiple choice chemistry substances in the surroundings - their states and properties measurement of density properties of substances fundamental and derived units

A vessel contains oil (density $= 0.8\ gm/cm^{3})$ over mercury (density $= 13.6\ gm/ cm^{3})$. A uniform sphere floats with half its volume immersed in mercury and the other half in oil. The density of the material of sphere in $gm/ cm^{3}$ is

  1. $3.3$
  2. $6.4$
  3. $7.2$
  4. $12.8$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A vessel contains oil density $=0.8gm/cm^3$

Mercury density $=13.6gm/cm^3$
Total weight is balanced by the displaced volumes of the two different fluids. Let it $s$ and volume id $v$ and te density is $n$.
Then the equilibrium condition should be
$v _{mg}=v/2(0.8)g+\cfrac{v}{2\times136g}\n=0.4+6.8=7.2gm/cm^3$