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

Answer: (a)

U.N.’s International Atomic Energy Agency (IAEA) approved the U.S.-backed scheme to establish a reserve of low-enriched uranium (LEU), the IAEA has yet to conclude negotiations with Kazakhstan, the country that will host the fuel bank.

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.

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: (a)

When the missile is launched with a velocity less than the escape velocity, it will be influenced by our gravitation. So it will constitute a bound system for which the total energy (sum of its kinetic energy and potential energy) will be negative.

Answer: (d)

It is fueled by liquid Oxygen and liquid Hydrogen propellants. GSAT-6 satellite was carrying S-Band and C-Band transponders meant for public and strategic purposes.

Answer: (d)

This suit gives pilot an additional capability of nullifying the effect of detected radar threat by appropriate mode of jamming.