sweden is the country which has six months nights and six
months days.Because it is above tha Arctic circle, which is
a circle around the North Pole extending down to a latitude
of about 23 degrees, which is equal to the tilt of Eart's
Because of the tilt of the axis, any place North of the
Arctic circle will have sunlight 24 hours a day for half
the year, and darkness the rest of the year, or at least
infra-red rays were first detected by?
the intensity level of sound is measured in?
the material used for a fuse wire should?
radioactivity is a property of?
what is the source of electric energy in an artificial
the following is used as a lubricant in heavy machines?
supher, bauxite , graphite, phosphorus
In an atomic explosion, enormous energy is released which is
due to the
1 Conversion of neutrons into protons
2 Conversion of chemical energy into nuclear energy
3 Conversion of mass into energy
4 None of these