science & tech MCQ section 7 Practice Questions Answers Test with Solutions & More Shortcuts

Answer: (b)

Sunlight doesn’t light up space because there is nothing there for it to light up. Light in space travels in straight lines, so we only see sunlight when we look at the sun.

As for the rest of the universe, if we assume an infinite universe, we would expect it to be bright with the light of infinity of stars. This is called Olbers’ paradox.

But the intensity of the light decreases with the square of the distance, and at some point, the stars are too far away and receding too fast for their light to ever reach us. So the actual amount of starlight from very distant stars is negligible.

Answer: (a)

Under the Asteroid Redirect Mission (ARM) an asteroid or its part will be captured by the robotic spacecraft. ‘2011 MD’ has been shortlisted for this purpose along with other two.

Answer: (c)

India’s first microwave remote sensing satellite is RISAT-1.

Note: RISAT-1 is an indigenously developed radar imaging satellite successfully launched by a PSLVXL rocket on April 26, 2012, from Satish Dhawan Space Centre, Sriharikota. RISAT-2 was the first of the RISAT series to reach orbit.

It was launched successfully on April 20, 2009, by a PSLV rocket. After the November 26, 2008, Mumbai attacks, the launch plan was modified to launch RISAT2 before RISAT-1, since the indigenous C-band SAR to be used for RISAT-1 was not ready.

Answer: (b)

The Radio Astronomy Centre (RAC) is part of the National Centre for Radio Astrophysics (NCRA) of the well-known Tata Institute of Fundamental Research (TIFR) which is funded by the Government of India through the Department of Atomic Energy.

The RAC is situated near Udhagamandalam (Ooty) in the beautiful surroundings of the Nilgiri Hills and it provides a stimulating environment for the front-line research in radio astronomy and astrophysics with its excellent and highly qualified staff and international reputations.

Answer: (b)

Prime Minister Narendra Modi launched ProActive Governance and Timely Implementation (PRAGATI) platform on 25 March 2015.