Test: Science & Technology- 2 - Railways MCQ

High Frequency Active Auroral Research Programme (HAARP) is an ionspheric research programme and the main purpose is to investigate the potential for developing ionaspheric enhancement technology for radio communications and surveillance.

Orbital decay, a process of prolonged reduction in the altitude of a satellite’s orbit is caused due to atmospheric drag, tides and gravitational pull.

GPON standard differs from other passive optical network standards in that it achieves higher bandwidth and higher efficiency using larger variable length packets. GPON offers efficient packaging of user traffic with frame segmentation allowing higher quality of service for delaysensitive voice and video communications traffic. On the other hand, PON is a network architecutre that brings fibre cabling and signals to the home using a point-to-multipoint scheme that enables a single optical fibre to serve multiple premises.

The device has been developed to near completion using a bistable 'electrofluidic imaging film' for e–paper. The screen of proposed flexible devices would need to be able to display text and images, yet be flexible and tough enough.

The correct answer is D: 2 only.

1. Statement 1 is incorrect: The SKA (Square Kilometre Array) telescope is an international project aiming to build the world's largest radio telescope, which will consist of thousands of antennas spread across various locations, not just 36 antennas with a 12-meter diameter. The specific detail about 36 antennas likely refers to the Australian SKA Pathfinder (ASKAP), but it is separate from the SKA project itself.

2. Statement 2 is correct: The SKA telescope is designed to capture radio waves from deep space, providing detailed information about the cosmos, including the gases involved in the formation of stars and other celestial bodies.

Therefore, the correct choice is D: 2 only.

Statement 2 is not correct: Megha–Tropiques is a joint atmospheric satellite mission of India (ISRO) and Russia (Roscosmos).
Megha-Tropiques is a joint satellite mission between the Indian Space Research Organisation (ISRO) and the French space agency, CNES. The satellite was launched on October 12, 2011 to study the water cycle and energy exchanges in the tropics. The mission's main objective is to understand the life cycle of convective systems that influence tropical weather and climate. 

The correct answer is D: 2 and 3 only.

1. Statement 1 is true: Nirbhaya is indeed a subsonic cruise missile being developed by the Defence Research and Development Organisation (DRDO) of India.

2. Statement 2 is not true: As of now, the air version of BrahMos has been successfully test-fired, but it's essential to verify the context of "recently," as successful tests occur periodically. If the question refers to a specific recent test, it could be deemed inaccurate if no recent test was conducted.

3. Statement 3 is not true: BrahMos-II is intended to be a hypersonic cruise missile, but the target range is not specified to be over 300 km; instead, it is expected to exceed 600 km.

Given that Statements 2 and 3 are not true, the correct choice is D: 2 and 3 only.

DRAMs are less expensive and slower than SRAMs. DRAM requires to be refreshed periodically as opposed to the SRAM. DRAM has higher bit density and lower power consumption.

The ISRO is designing a Geo imaging satellite (Gisat) which is planned to be launched during 2016–17. It will carry a GEO imager with multi–spectral (Visible, near–infra–red and thermal) and multiresolution (50m to 1.5 km) imaging instruments. It will acquire images of a geographical strip and also provide near real time images of large areas of the country.

Dhanush missile is an indigenously developed naval version of the Prithvi short range ballistic missile. It is a single stage missile and was developed by the DRDO and it uses liquid propellant. It was successfully test-fired on 13 November, 2013.

It is a highly reliable, multi-purpose, fuel efficient rugged, lightweight twin turbo prop aircraft with a retractable tricycle landing gear.

Cookies can be used to maintain data. They can be used to track internet user’s web browing as well.

Data rates over Ethernet can be upto 100 gigabits per second. Ethernet has a good degree of compatability.

ISRO space vision 2025 includes satellite based communication and navigation systems mainly for rural connectivity.

A ‘Ramjet’ is also referred to as a flying ‘stovepipe’ or an athodyd. Ramjets are frequently confused with pulsejets, which use an intermittent combustion but Ramjets employ a continuous combustion process. They can not produce thrust at zero airspeed. They are also confused with ‘Scramjets’, which are a similar system designed for higher speeds, using supersonic flow.

NASA has joined the European space Agency’s (ESA’) Euclid mission, a telescope designed to investigate the cosmological mysteries of dark matter and dark energy. Euclid is a medium –class (“M–class”) mission and is part of ESA’s “Cosmic Vision”, 2015–2025 scientific program.

Nirbhay is a long range, subsonic cruise missile being developed in India by Defence Research and Development Organisation. The missile has a good loitering capability i.e., it can go round a target and perform several manoeuvres and then re-engage it. Its first trial on 12 March 2013 from Chandipur, Odisha was failed. Brahmos is a supersonic cruise missile, while ‘Lakshya’ is an Indian pilot-less target drone system. Nirbhy’s technology is not inspired by it. It is a “tree–top” missile because it can flyover or around hills, can fly at a very low altitude and avoid detection.

A dwarf planet is a planetary-mass object that is neither a planet nor a satellite. More explicitly, the International Astronomical Union (IAU) defines a dwarf planet as a celestial body in direct orbit of the Sun that is massive enough for its shape to be controlled by gravitation, but that unlike a planet has not cleared its orbital region of other objects.The point 3 refers to asteroids.

1 Mars year = 23 Earth months = 686.65 days = 1.88 Earth years 1 Day on Mars = 24 hours 39 minutes 35 seconds Mars has all four seasons that the Earth does, but, since the year is longer on the planet, the axial tilt is different, and Mars has a more eccentric orbit than Earth, the seasons are not the same length as each other nor are they the same in each hemisphere. In the northern hemisphere spring is the longest season. In the northern hemisphere of Mars the seasons break down like this: Spring – 7 months, Summer – 6 months, Fall – 5.3 months, and Winter – just over 4 months. In the south seasons not exactly the same length as in the north, but they are similar; however, the temperatures can be as much as 30 C warmer.

HD40307g is an exoplanet orbiting in the habitable zone of HD40307. It is located 42 light-years away in the direction of the southern constellation Pictor. The planet was discovered using the European Southern Observatory’s HARPS apparatus by a team of astronomers of University of Hertfordshire and Guillem Anglada-Escude of the University of Goettingen, Germany.