QUIZ – 2020: INSIGHTS STATIC , 30 April 2021 – Science and Technology

Solution: d)

A ballistic missile is a missile (rocket) that follows a ballistic trajectory with the objective of delivering one or more warheads to a predetermined target.

A ballistic missile is only guided during relatively brief periods of flight (there are unguided ballistic missiles as well, although these may well be considered rockets), and most of its trajectory is unpowered and governed by gravity and air resistance if in the atmosphere.

This contrasts to a cruise missile, which is aerodynamically guided in powered flight.

Long range intercontinental ballistic missiles (ICBM) are launched at a steep, sub-orbital flight trajectory and spend most of their flight out of the atmosphere. Shorter range ballistic missiles stay within the Earth’s atmosphere.

Solution: c)

SONAR is a technique that uses sound propagation (usually underwater, as in submarine navigation) to navigate, communicate with or detect objects on or under the surface of the water, such as other vessels.

Dedicated sonars can be fitted to ships and submarines for underwater communication. Sonars which act as beacons are fitted to aircraft to allow their location in the event of a crash in the sea. Sound waves travel differently through fish than through water because a fish’s air-filled swim bladder has a different density than seawater. This density difference allows the detection of schools of fish by using reflected sound. Acoustic technology is especially well suited for underwater applications since sound travels farther and faster underwater than in air.

Solution: b)

The NAG missile is a third-generation anti-tank guided missile, which has top attack capabilities that can effectively engage and destroy all known enemy tanks during day and night.

It uses an imaging infrared seeker in lock-on-before-launch mode.

It is launched from NAG missile carrier (NAMICA) which is capable of carrying up to 6 combat missiles.

Range:  Minimum-500 metres and Maximum- 4 kilometres.

Developed by DRDO.

Solution: a)

It was indigenously developed by Defence Research and Development Organisation (DRDO) under the Integrated Guided-Missile Development Programme (IGMDP).

It is powered by Ramjet-rocket propulsion system (RRPS) which renders thrust for the missile to intercept the target at supersonic speed without any retardation.

It is capable of neutralising aerial targets like cruise missiles, fighter jets, unmanned aerial vehicles (UAV) and air-to-surface missiles. It is a surface to air missile.

Solution: d)

Lakshya is a high speed target drone system developed by DRDO.

The drone remotely piloted by a ground control station provides realistic towed aerial sub-targets for live fire training.

The Nishant UAV is primarily tasked with intelligence gathering over enemy territory and also for reconnaissance, training, surveillance, target designation, artillery fire correction, damage assessment, ELINT and SIGINT.