Q. Sub-orbital flight refers to –

[A] Launch vehicle carrying loads to semi-synchronous orbit

[B] Commercial flights flying above the stratosphere.

[C] Flights holding their service operations for a fixed time.

[D] Launch vehicles travelling slower than the earthu2019s orbital velocity

Answer: D
Notes:

Sub-orbital flight refers to those launch vehicles that travel lower than the earth’s orbital velocity which means that vehicle is fast enough to reach outer space but not fast enough to stay in an orbit around the Earth. Vikram-S, first private launcher, will carry three customer satellites in a sub-orbital flight.

Source: The Indian Express