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

Answer: (a)

Graphene is a 2-dimensional single layer of carbon atoms. It is characterized by its flexibility, elasticity, lightweight, and strength.

Answer: (c)

Nitrogen fixation is a process by which nitrogen (N2 ) in the atmosphere is converted into ammonia (NH3 ). Atmospheric nitrogen or molecular nitrogen (N2 ) is relatively inert: it does not easily react with other chemicals to form new compounds.

It is essential for all forms of life because nitrogen is required to biosynthesize basic building blocks of plants, animals and other life forms, e.g., nucleotides for DNA and RNA and amino acids for proteins.

Answer: (b)

The Crowned Solitary Eagle (Buteogallus coronatus), is a large South American raptor. Albatrosses are large flying birds that spend most of their life on the sea found in the Southern Hemisphere: Antarctica, Australia, South Africa, and South America.

The snow leopard (Panthera uncia or Uncia uncia ) is native to the mountain ranges of Central Asia. All of the three have been added to the red data list of IUCN.

Answer: (a)

The Vikram Sarabhai Space Centre is a major space research centre of the Indian Space Research Organisation (ISRO), focusing on rocket and space vehicles for India’s satellite programme. It is located in Thiruvananthapuram, in the Indian state of Kerala.

The centre had its beginnings as the Thumba Equatorial Rocket Launching Station (TERLS) in 1962. It was renamed in honour of Dr Vikram Sarabhai, the father of the Indian space program. The Vikram Sarabhai Space Center is one of the main Research & Development establishments within ISRO.

VSSC is an entirely indigenous facility working on the development of sounding rockets; Rohini and Menaka launchers; ASLV, PSLV GSLV and the GSLV Mk III.

Answer: (a)

Gorakhpur nuclear power plant has been proposed to be constructed at Fatehabad (Haryana), but has met with continuous protest from the farmers. Recently, Ministry of Environment, Forests & Climate Change has given coastal regulatory zone approval to Mithivirdi Nuclear Power Plant, Bhavnagar (Gujarat).

Answer: (c)

A geosynchronous satellite is a satellite in geosynchronous orbit, with an orbital period the same as the Earth’s rotation period. Such a satellite returns to the same position in the sky after each sidereal day, and over the course of a day traces out a path in the sky that is typically some form of the analemma.

A geostationary orbit, or Geostationary Earth Orbit (GEO), is a circular orbit 35,786 kilometres above the Earth’s equator and following the direction of the Earth’s rotation.

An object in such an orbit has an orbital period equal to the Earth’s rotational period (one sidereal day) and thus appears motionless, at a fixed position in the sky, to ground observers.