Description : Who discovered cement? (1) Agassit (2) Albertus Magnus (3) Joseph Aspdin (4) Janseen
Last Answer : Joseph Aspdin
Description : Singing of telephone wires in the wind occurs due to : (a) Vibrations caused by birds as they sit on or get off, the wires (b) Tensioning at the ends (c) Magnus effect (d) Generation of Karman Vortex street
Last Answer : (d) Generation of Karman Vortex street