The elements of glass are heated to…………. Fahrenheit.
a) 1800o (982o C)
b) 1600o
c) 1400o
d) 1200o
Sodium bicarbonates is used as:
NTS PST 24/11/2019 (2:30)
a) fertilizer
b) Baking soda
c) sugar industry
d) disinfectant
Identify the correct statement in the following?
a) hydrogen is inert and helium is explosive
b) hydrogen is explosive and helium is inert
c) hydrogen is light and helium is explosive
d) hydrogen is gas and helium is solid at room temperature
If copper, aluminum, iron and lead
are left in open air which one will rust?
a) copper
b) aluminum
c) lead
d) iron
One of the limitations for copper plumbing is...
a) it leaks easily
b) it is capable carrying water with a specific pH
c) it is not easy to bend and cut
d) it works only in cold environment
Pure water has a pH of………
a) 8
b) 7
c) 6
d) 5
Out of copper, aluminum, iron, and lead, **d. iron** is the one that will rust. Rust specifically refers to the corrosion of iron and its alloys (like steel) when they react with oxygen and moisture in the air, forming iron oxides. While other metals can corrode (e.g., copper forms a greenish patina, aluminum forms a thin oxide layer), the term "rust" is unique to iron.
by at 2025-05-23 08:11:16