Tag: science & technology

Blood group O individuals can only receive from O group because they have both anti-A and anti-B antibodies. They are universal donors but can only accept from their own type.

Oxygen is essential for combustion (burning) as it supports the fire triangle. Carbon, aluminum, and nitrogen are not required for the burning process.

The ozone layer in the stratosphere absorbs harmful UV radiation, protecting life on Earth. Nitrogen and oxygen make up most of the atmosphere but don't block UV, while CO2 contributes to greenhouse effect.

Blood appears red due to hemoglobin, an iron-containing protein in red blood cells that binds oxygen. Hemoglobin's iron atoms reflect red light, giving blood its characteristic color. The other options are incorrect: red and white pigments are nonspecific, while chlorophyll is the green pigment in plants, not found in blood.

PSLV stands for Polar Satellite Launch Vehicle, an ISRO rocket designed to launch satellites into polar orbits. 'Public', 'Pulsar', and 'People' are incorrect expansions.

PSLV primarily launches satellites into Geostationary Transfer Orbit (GTO), despite its name emphasizing polar capability. Polar sun-synchronous is also common but GTO is the standard transfer orbit for communication satellites. 'Equitorial' and 'Oceanstationary' are not standard orbit terms.

STUDSAT (Student Satellite) was developed by Indian engineering students and launched by PSLV in 2010. It was India's first pico-satellite built by students. 'Studentsat', 'Studysat', and 'Indsat' are not the correct names.

PSLV has had 2 total failures: the inaugural flight in 1993 and one partial failure in 2017 (PSLV-C39 IRNSS-1H). It has maintained over 95% success rate across 50+ missions, making it one of the world's most reliable launch vehicles.