(A) Increase fluidity of solder metal

(B) Feel up gaps left in a bad joint

   (C) Carbon steel

(D) Prevent oxides forming

(A) Apply high pressure at edge

   (B) Retain heat

(C) Retain solder

(D) Forge welding

(A) Soldering iron

(B) Induction furnace

(C) Electric resistance method

   (D) Any of the above

(A) Brass

(B) Tin

(C) Steel

   (D) Copper

(A) 40^oC to 100^oC

(B) 180^oC to 250^oC

(C) 300^oC to 500^oC

(D) 600^oC to 900^oC

(A) 10 to 15%
(B) 15 to 20%
(C) 20 to 30%
(D) 30 to 40%

(A) horizontally
(B) vertically
(C) in the parallel direction
(D) in all directions

(A) internal energy is zero
(B) they are also in thermal equilibrium with each other
(C) they are not in thermal equilibrium with each other
(D) the total work done is zero