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

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: (d)

Dakshin Gangotri was the first scientific base station of India situated in Antarctica, part of the Indian Antarctic Program. It is located at a distance of 2,500 kilometres from the South Pole. It was abandoned in 1988-1989 after it was submerged in ice. It was succeeded by the Maitri.

Answer: (b)

Green diesel is chemically distinct fuel product than biodiesel.

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.

Answer: (b)

The Indian Space Research Organisation (ISRO) is the primary space agency of the Indian government. ISRO is amongst the six largest government space agencies in the world, along with NASA, RKA, ESA, CNSA and JAXA. Its primary objective is to advance space technology and use its applications for national benefit. Established in 1969, ISRO superseded the erstwhile Indian National Committee for Space Research (INCOSPAR).

Headquartered in Bangalore, ISRO is under the administrative control of the Department of Space, Government of India. ISRO has achieved numerous milestones since its establishment. India’s first satellite, Aryabhata, was built by ISRO and launched by the Soviet Union in 1975. Rohini, the first satellite to be placed in orbit by an Indian-made launch vehicle, SLV-3, was launched in 1980.

ISRO subsequently developed two other rockets: the Polar Satellite Launch Vehicle (PSLV) for putting satellites into polar orbits and the Geosynchronous Satellite Launch Vehicle (GSLV) for placing satellites into geostationary orbits.

These rockets have launched numerous communications satellites, earth observation satellites, and, in 2008, Chandrayaan-1, India’s first mission to the Moon.

Answer: (a)

Sputnik 1 was the first artificial Earth satellite. It was a 585 mm diameter polished metal sphere, with four external radio antennae to broadcast radio pulses. The Soviet Union launched it into an elliptical low Earth orbit on 4 October 1957.