Match the suitability of non-destructive testing method in Group I for the detection of defects listed in Group II.

Group I	Group II
P. Magnetic particle inspection	1. Surface crack in martensitic stainless steels
Q. X-ray radiography	2. Surface crack in austenitic stainless steels
R. Dye penetrant test	3. Hairline crack in aluminium
S. Ultrasonic testing	4. Inclusion in steels

Fatigue life is expected to increase by

A. increasing the size of the sample

B. smooth polishing of the surface of the sample

C. having compressive residual stresses at the surface

D. having tensile residual stresses at the surface

Which of the following is a function of a developer

A. Providing a contrasting background for visible dye indications

B. Making the penetrant water washable

C. Penetrating into discontinuities open to the surface

D. Dissolve organic soils on the test piece surface

With an increase in temperature, hardness of material . . . . . . . . and ductility . . . . . . . .

A. Increases, increases

B. Increases, decreases

C. Decreases, increases

D. Decreases, decreases

A brale indentor used in Rockwell hardness test has the following geometry and material.

A. Square based diamond pyramid with 136° included angle

B. Conical shape steel with 120° apex angle

C. Conical shaped diamond with 120° apex angle

D. 10 mm diameter hardened steel ball