science & tech MCQ section 4 MCQ Questions & Answers Detailed Explanation

Answer: (b)

Graphite electrode is used in melting of steel. Recently, the Indian government has imposed antidumping duty on import of graphite electrode to protect domestic industry.

Answer: (c)

Gaia satellite, the billion star surveyor was launched by ESA in 2013.

Answer: (b)

The missile is a variant of Dongfeng-31 A with same range but improved capability in carrying warheads.

Answer: (c)

The Indian Institute of Space Science and Technology is India’s national institute for the study and development of space science, located at Valiamala, Nedumangad, Thiruvananthapuram, Kerala. It was inaugurated on 14 September 2007 by G. Madhavan Nair, the then Chairman ISRO.

IIST is sponsored by the Indian Space Research Organisation (ISRO) under the Department of Space, Government of India. IIST offers undergraduate B. Tech., master’s M. Tech and PhD programs in space science and technology, and also serves as a research centre.

Answer: (a)

Aryabhatta, the first Indian space satellite, was launched for India on April 19, 1975. Later, BhaskaraI, an Earth observation satellite, was launched for India on June 7, 1979. India launched its own satellite for the first time on July 18, 1980.

It was the Rohini1 satellite carried aloft on a Satellite Launch Vehicle (SLV) rocket from the Sriharikota Island launch site.

Note: in its thirty-ninth flight (PSLV-C37), ISRO’s Polar Satellite Launch Vehicle successfully launched the 714 kg Cartosat-2 Series Satellite along with 103 co-passenger satellites on February 15, 2017, from Satish Dhawan Space Centre SHAR, Sriharikota.

The total weight of all the 104 satellites carried onboard PSLV-C37 was 1378 kg. The previous record was held by Russia, which sent 37 satellites into orbit in 2014.

Answer: (c)

A multiple independently targetable re-entry vehicle (MIRV) warhead is a collection of separate warheads. By contrast, a unitary warhead is a single warhead on a single missile. It provides greater target damage for a given missile payload.

With a MIRV warhead, the post-boost (or bus) stage can dispense the warheads against multiple targets across a broad area. It reduces the effectiveness of an anti-ballistic missile system that relies on intercepting individual warheads.

While a MIRV attacking missile can have multiple warheads (3–12 on United States missiles and 3-10 on Russian), interceptors may have only one warhead per missile. Thus, in both a military and an economic sense, MIRVs render ABM systems less effective.