science & tech MCQ section 3 MCQ Questions & Answers Detailed Explanation

Answer: (b)

Green diesel is chemically distinct fuel product than biodiesel.

Answer: (d)

Agni is a surface to surface missile developed in India under Integrated Guided Missile Programme.

Answer: (b)

The Apollo missions were a series of space missions, both manned and unmanned, flown by NASA between 1961 and 1975. They culminated with a series of manned Moon landings between 1969 and 1972.

The first manned flight of Apollo was in 1968 and it succeeded in landing the first humans on Earth’s Moon in 1969 through 1972.

It was during the Apollo 11 mission that astronauts Neil Armstrong and Buzz Aldrin landed their Lunar Module (LM) on the Moon on July 20, 1969, and walked on its surface while Michael Collins remained in lunar orbit in the command spacecraft, and all three landed safely on Earth on July 24.

Answer: (c)

The world’s lightest substance has been developed by Chinese scientists of Zhejiang University - Carbon aerogel that has a density of only one sixth of that of the air. Its density is only 0.16 mg/cubic centimetre, less than previously recorded lightest substance, graphite aerogel.

Answer: (c)

The Boeing B-52 Stratofortress is a long-range, subsonic, jet-powered strategic bomber. The B-52 was designed and built by Boeing, which has continued to provide support and upgrades. It has been operated by the United States Air Force (USAF) since the 1950s. The bomber carries up to 32,000 kg of weapons.

Due to the late 1950s-era threat of surface-to-air missiles (SAMs) that could threaten high-altitude aircraft, seen in the practice in the 1960 U-2 incident, the intended use of B-52 was changed to serve as a low-level penetration bomber during a foreseen attack upon the Soviet Union, as terrain masking provided an effective method of avoiding radar and thus the threat of the SAMs.

Although never intended for the low-level role, the B-52’s flexibility allowed it to outlast several intended successors as the nature of aerial warfare changed.

Answer: (d)

Scientists believe that this finding could potentially support life. NASA’s Galileo mission had provided first evidence of ocean in Ganymede after measuring its magnetic field in 2002.