(A) Water test is carried out to check water tightness of the joints
(B) Test for straightness is carried out with the help of a lamp and mirror
(C) Obstruction test is carried out with the help of smooth ball of diameter 13 mm
(D) All the above
(A) Water test is carried out to check water tightness of the joints
(B) Test for straightness is carried out with the help of a lamp and mirror
(C) Obstruction test is carried out with the help of smooth ball of diameter 13 mm
(D) All the above
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