science & tech MCQ section 6 MCQ Questions & Answers Detailed Explanation

Answer: (a)

The design of the Astradharini is a collaborative effort of Naval Science and Technological Laboratory, Shoft Shipyard and IIT Kharagpur and has a unique design of a catamaran hull form that significantly reduces its power requirement and is built with indigenous steel. Having a length of 50 metres, the vessel is capable to do speeds up to 15 Knots.

Answer: (d)

India’s first exclusive defence satellite GSAT-7 was successfully launched by European space consortium Arianespace’s Ariane 5 rocket from Kourou spaceport in French Guiana. The state-of-the-art satellite carried payloads operating in UHF, S, C and Ku bands.

Answer: (c)

We see colours because of the way light is reflected off of objects or substances. Light can either be absorbed into the object (or substance) or reflected.

If an object or substance absorbs all wavelengths (colours) except blue, blue will be reflected and that is the colour we see. If a substance absorbs all wavelengths except red and yellow the object will appear orange. If an object or substance absorbs no wavelengths but reflects them all, it is white - not black, as you might think. The colour white is a combination of all colours. Black is the absence of any colour.

Space is black because there are no substances or objects to reflect back any colour (or all colours, which would make it white). That is also why the astronauts see the earth as we see it in photos, but the space around it is black.

The light from the sun is reflected back as the blues and greens and browns that we see, but the space around the earth is just that - empty space and therefore does not reflect back any colours, so it is black.

Answer: (a)

The study of life outside earth or extraterrestrial life or alien life and the effects of extraterrestrial surroundings on living organism is known as Exobiology or Astrology or space biology. The hypothetical forms of life in space are of bacteria, and virus like organisms.

Answer: (c)

Shah Rukh Khan was appointed as the brand ambassador for Jio.

Answer: (c)

India has 19 Pressurized Heavy water Reactors. It is a nuclear power reactor commonly using unenriched natural uranium as its fuel, that uses heavy water (D2 O) as its coolant and moderator.