1.   Which is used to measure the accurate free length of valve spring?

A.    Micrometer

B.    Feeler gauge

C.    Spring tester

D.    Spring gauge

2.   What is the least count of vernier scale?

E.    0.02

F.    0.03

G.    0.001

H.    0.002

3.   What is the value of one vernier scale, if 19 mm are divided into 10 equal parts on the vernier scale?

A.    A 1.1 mm

B.    B 1.5 mm

C.    C 1.7 mm

D.    D 1.9 mm