Tag: elastic and plastic substances

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Questions Related to elastic and plastic substances

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

Which of the following is an example of plastic deformation?

  1. stretching a rubber band

  2. stretching salt water taffy

  3. none

  4. both
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Whenever a deforming force is applied to a non-rigid substance, the substance undergoes deformation in dimension or shape. Elastic substances are those which come back to their original shape or dimensions after the deformation force is removed. Plastic substances are those which do not come back to their original shape or dimensions even after the deformation force is removed.

Salt water taffy is a plastic material. Hence stretching of it will be a plastic deformation. Rubber-band is an elastic material.

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

Which of the following are close to ideal plastics?

  1. Putty

  2. Mud

  3. Rubber band

  4. None of the above
Reveal answer Fill a bubble to check yourself
A,B Correct answer
Explanation

Whenever a deforming force is applied to a non-rigid substance, the substance undergoes deformation in dimension or shape. Plastic substances are those which do not come back to their original shape or dimensions even after the deformation force is removed.
Substances like clay, putty, mud etc., are highly plastic in nature

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

Which of the following is not artificial form of plastics?

  1. Nylon

  2. Teflon

  3. Styrofoam

  4. None of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Plastic is a synthetic material made from a wide range of organic polymers such as polyethylene, PVC, nylon, etc., that can be moulded into shape while soft, and then set into a rigid or slightly elastic form. 

Nylon, teflon and styrofoam are all examples of plastics.

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

The property of a material due to which shape is changed permanently is known as:

  1. Elasticity

  2. Plasticity

  3. Ductility

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

The property of a body to regain its original shape when the deforming force is removed from it or to oppose the change in its original shape is called elasticity.

Plasticity is the property of a material not to regain its original shape when the deforming force is removed, i e. a deforming force changes the shape of material permanently. 
Ductility is commonly defined as the ability of a body to be stretched into wires.

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