MULPTIPLE CHOICE 1. Hardness of a material indicates its resistance to: (a) Flow

Question

MULPTIPLE CHOICE

1. Hardness of a material indicates its resistance to:

(a)    Flow of electrons

(b)   Flow of heat

(c)    Penetration by magnetic field

(d)   Elastic and plastic deformation

(e)    Penetration by nuclear radiation                                                                                             (     )

2. Ultimate tensile strength is:

(a)    The stress at 0.2% strain

(b)   The stress at the onset of plastic deformation

(c)    The stress at the end of elastic deformation

(d)   The stress at fracture

(e)    The maximum stress in a stress-strain curve                                                                           (     )

3. Modulus of resilience is:

(a)    Slope of elastic portion of stress

Explanation / Answer

1) (d) Elastic and plastic deformation

2) (e) The maximum stress in a stress-strain curve

3) (b) Area under the elastic portion of the stress

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