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

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: (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: (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: (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.

Answer: (d)

A very small aperture terminal (VSAT), is a two-way satellite ground station or a stabilized maritime VSAT antenna with a dish antenna

Answer: (a)

Thorium is for more abundant in nature than uranium.