Explanation : A CD-ROM is a pre-pressed optical
compact disc that contains data. Computers
can read-but not write to or erase. It has
the capacity of 194 MiB (8 cm), 650-900
MiB (12 cm). A read-only DVD disc used
to permanently store data files. It has the
storage capacity of 4.7 GB (single-sided,
single-layer - common) 8.5 GB (single-
sided, double-layer) 9.4 GB (double-sided,
single-layer) 17.08 GB (double-sided,
Blu-ray or Blu-ray Disc (BD) is a digital
optical disc data storage format. It was
designed to supersede the DVD format, and
is capable of storing several hours of video
in high-definition (HDTV 720p and 108Op)
and ultra high-definition resolution (216Op).
Explanation : Methemoglobinemia is a blood disorder in
which an abnormal amount of methemoglobin
is produced. Methemoglobin is a form of
hemoglobin. With methemoglobinemia, the
hemoglobin can carry oxygen, but is not
able to release it effectively to body tissues.
Methemoglobinemia is passed down through
families (inherited or congenital) and it
is also caused by the exposure to certain
medicines, chemicals, or foods (acquired).
Explanation : MOOCs are courses delivered online and
accessible to all for free. MOOC stands
for massive open online course: Massive
because enrollments are unlimited and can
run into hundreds of thousands.
Explanation : Cyclone Gaja crossed coast between
Nagapattinam and Vedaranniyam with
wind speed of 100-11 0 km/h gusting up
to 120 km/h in November 2018. Cyclonic
Hudhud was a strong tropical cyclone that
caused extensive damage and loss of life in
eastern India during October 2014. Cyclone
Ockhi strucked the Indian coast in the end
of November 2017.