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 elastic behaviour of solids elastic and plastic substances properties of substances

Which of the following statements is incorrect?

  1. When a material is under tensile stress, the restoring forces are caused by interatomic attraction while under compressional stress, the restoring force is due to interatomic repulsion

  2. The stretching of a coil is determined by its shear modulus

  3. Rubber is more elastic than steel

  4. Shearing stress plays an important role in the buckling of shafts
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

More elastic means, the value of an elastic constant is more and. Steel have move elastic constant in compare to Rubber, So Steel is more elastic than rubber.
All other statements are correct.

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

Fill in the blank.
In a technical sense a substance with a ________ elasticity is one that requires a ______  force to produce a distortion-for example, a steel sphere. 

  1. high, small

  2. high, large

  3. low, large

  4. low , small
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

According to Hooke's law, within elastic limit,

    $E=\dfrac{stress}{strain}$$=\dfrac{deforming\ force}{(area\times strain)}$ 
It means higher the elasticity, larger will be the required deforming force.
Hence, in a technical sense a substance with a high elasticity is one that requires a high force to produce a distortion.

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

As compared to concrete, steel has compressive strength:

  1. $25$ times less

  2. equal
  3. $25$ times more
  4. $5$ times more
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Compressive strength is the capacity of a material or structure to withstand loads tending to reduce size, as opposed to tensile strength, which withstands loads tending to elongate.

Compressive strength is one of the most important engineering property of Concrete which designers are concerned of. However the compressive strength of steel is around 25 time more than that of concrete.

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

Elasticity is defined as the ability of a body to 

  1. Resist linear motion in a hard surface

  2. Resist rolling motion in a hard surface

  3. Resist a distorting influence and to return to its original size and shape when that influence or force is removed.

  4. Resist electric current in a magnetic field
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Elasticity is defined as the ability of a body to  resist a distorting influence and to return to its original size and shape when that influence or force is removed.

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

Substances that elongate considerably and undergo plastic deformation before they break are known as

  1. brittle substances

  2. breakable substances

  3. ductile substances

  4. all of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Substances that elongate considerably and undergo plastic deformation before they break are known as ductile substances

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

An elastic metal rod will change its length when it

  1. falls vertically under its weight

  2. is pulled along its lengthy by a force acting at one end

  3. both

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

An elastic rod changes its length when subjected to a tensile force (being pulled). Falling vertically under its own weight also causes stress and potential elongation, but pulling is the standard demonstration of elastic deformation.

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

Which one of the following substance possesses the highest elasticity?

  1. rubber

  2. glass

  3. steel

  4. copper
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Modulus of elasticity gives the idea of elasticity. For above materials, values of E are:
Glass: $50-90 GPa$
Rubber:$ 0.01-0.1 GPa$
Steel:$ 200 GPa$
Copper: $117 GPa$

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.