Acme

Square

Buttress

All of the above

50 degree

40 degree

60 degree

55 degree

to reduce hysteresis effect

to give linear relation between applied strains and resistance change

to increase sensitivity

to reduce or eliminate the effect of variation in ambient temperature

0.7 to 1.5%

0.05 to 0.25%

3 to 3.75%

none of the above

Argon and helium

Helium and neon

Hydrogen and neon

Carbon dioxide and hydrogen