Which is the largest oil refinery in the world?

a) Jamnagar Refinery, India

b) Paraguana Refinery, Venezuela

c) Ulsan Refinery, South Korea

d) Yeosu Refinery, South Korea (more…)

Which instrument is used to measure altitude of a celestial body?

a) Thermometer

b) Sextant

c) Anemometer

d) Pyrometer  (more…)