Physics
The safest hammers are those with heads that are

Welded and alloyed
Chiseled and drop forged
Cast steel and chiseled
Alloy and drop-forged steel

ANSWER DOWNLOAD EXAMIANS APP

Physics
Superconductors are those elements

Whose resistance falls almost to zero at very low temperatures
Whose conductivity is intermediate between metals and insulators
Which conduct electricity only at super-high temperatures
Which turn into insulators at very low temperatures

ANSWER DOWNLOAD EXAMIANS APP