Tag: properties of substances

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Questions Related to properties of substances

Multiple choice chemistry substances in the surroundings - their states and properties elastic behaviour of solids elastic and plastic substances properties of substances

Pick up the correct statement:

  1. Cubic crystals exhibit isotropic nature with respect to therma expansion

  2. Anisotropic solids expand in one direction and contract in perpendicular direction

  3. Many of the crystals are anisotropic solids

  4. Rock salt crystal exhibits isotropic nature with respect to thermal expansion
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Crystals are typically anisotropic, meaning their physical properties (like thermal expansion) vary depending on the direction of measurement. Many crystals exhibit this property.

Multiple choice physics properties of material substances elastic behaviour of solids elastic and plastic substances properties of substances

The materials, which do not show a fixed trend of deformation vs. applied force, are called:

  1. inelastic materials

  2. plastic materials

  3. elastic materials

  4. rigid materials
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Elastic materials are those that follow the Hooke's law, which is that the deformation produced in a material is directly proportional to the stress applied to it, and the material is recoverable after the deformation force is removed.

Inelastic materials are those that do not follow this relationship. They do not show a fixed trend of deformation vs applied force; in fact, they might not deform at all (rigid materials) or the deformation observed is not completely recoverable.

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

The density of a cuboid of mass 200 g with dimensions 2 cm $\times$ 4 cm $\times$ 5 cm is

  1. 1000 kg m$^{-3}$
  2. 3000 kg m$^{-3}$
  3. 5000 kg m$^{-3}$
  4. 2000 kg m$^{-3}$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
The density of a body is defined as the amount of substance contained per unit volume.
Density $=\dfrac{mass}{volume}$

$\displaystyle d = \frac{0.2 kg}{40  cm^3} = \frac{0.2 \times 10^6}{40} kg  m^{-3}$

$=5000  kg  m^{-3}$
Multiple choice chemistry substances in the surroundings - their states and properties measurement of density properties of substances fundamental and derived units

A wire of length 50 cm has a mass of 20 gm. It its radius is halved by stretching, its new mass per unit length will be

  1. 0.4 g cm$^{-1}$
  2. 0.2 kg m$^{-1}$
  3. 0.1 g cm$^{-1}$
  4. 0.2 g cm$^{-1}$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

On stretching, volume remains constant. Hence on decreasing the radius by half, the length of the wire becomes quadrupled. 
Mass per unit length $\displaystyle = \frac{20}{4 \times 50 cm}$
$=0.1  g  cm^{-1}$

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

If 5 litres of kerosene has a mass of 5 kg, then what is the density of kerosene?

  1. 500 kg/$m^3$
  2. 1000 kg/$m^3$
  3. 100 kg/$m^3$
  4. 50 kg/$m^3$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Density of kerosene $= \displaystyle \frac{mass}{volume}$
$\displaystyle = \frac{5  kg}{5  litres}= \frac{5kg}{5 \times 10^{-3}m^3} = 1000 kg  m^{-3}$

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

Two spheres are having the ratio of their densities 1:3 and masses in 3:4 respectively. Find the ratio of their volumes. i.e $\dfrac{V _1}{V _2}$

  1. 1:3

  2. 3:1

  3. 4:9

  4. 9:4
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

$\displaystyle \frac{d _1}{d _2} = \frac{1}{3} ; \frac{m _1}{m _2} = \frac{3}{4}$
$d = m/v$
$\therefore \displaystyle \frac{V _1}{V _2}  = \frac{m _1}{m _2} \times \frac{d _2}{d _1} = \frac{3}{4} \times \frac{3}{1} = 9:4$

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

If the mass of a body is 12.1 g and its density is 2.2 g/cc, its volume is.

  1. $5.5 cm^3$
  2. $8$ cc
  3. $11$ cc
  4. $55$ cc
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Given:

mass $(m)=12.1g$
density $(d)=2.2g/cc$
Let the volume be $v$
As $density=\dfrac{mass}{volume}$
$d=\dfrac{m}{v}$
$v=\dfrac{m}{d}$
$v=\dfrac{12.1}{2.2}=5.5cc$