Nickel is added to wrought gold alloys as________?

When making a polysulphide impression for a caste crown, custom trays are usually preferred over stock trays for all of the following reasons except________?

Mode of failure during dislodgement of prosthesis cemented with zinc poly carboxylate cement is usually seen at the________?

Hysteresis in a hydrocolloid gel is________?

Which of the following is true about Agar hydrocolloid impression material?

Compare to conventional amalgams, spherical amalgams________?