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Coal is also called black gold. Coals are classified into Peat, Lignite, Bituminous, and Anthracite.

Lignite:

– Brown coal

– Lower grade coal

– Moisture content is high (over 35 percent)

Bituminous Coal:

– Soft coal; most widely available and used coal.

– Derives its name after the liquid called bitumen

– 40 to 80 percent carbon

– Moisture and volatile content (15 to 40 percent)

Anthracite Coal:

– Best quality; hard coal.

– 80 to 95 percent carbon.

–
Very little volatile matter

– Negligibly small proportion of moisture

The modern periodic table now provides a useful framework for analyzing chemical reactions, and continues to be widely adopted in chemistry, nuclear physics and other sciences. All elements ranging from atomic numbers 1 (hydrogen) to 118 (oganesson) have been either discovered or synthesized

Molluscs are the largest marine phylum.

Phylum is a taxonomic rank below Kingdom and above Class.

The term division has been used in Botany instead of phylum.

Newton’s first law of motion – sometimes referred to as the law of inertia.

Newton’s first law of motion is often stated as. An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

Luminous Flux is energy per unit time that is radiated from a source over visible wavelengths.
The SI unit of luminous flux is the lumen (lm).
One lumen is defined as the luminous flux of light produced by a light source that emits 1 cd of luminous intensity over a solid angle of 1 sr.

Neurons are the primary components of the central nervous system, which includes the brain and spinal cord, and of the peripheral nervous system, which comprises the autonomic nervous system and the somatic nervous system

Chandrayaan-2 is India’s second lunar exploration mission after Chandrayaan-1. Developed by the Indian Space Research Organisation (ISRO), the mission is planned to be launched to the Moon by a Geosynchronous Satellite Launch Vehicle (GSLV Mk II). It includes a lunar orbiter, lander and rover, all developed by India. The ISRO is planning to launch Chandrayaan-2 in April 2018.

Indian Space Research Organisation (Isro) is planning to launch the country’s second AstroSat-2 or space observatory. The mission is meant to further the study of astronomy (the study of celestial bodies) and astrophysics.

*Astrostat is India’s first X-ray space observatory, launched on a PSLV-XL on 28 September 2015.

*It orbits at 650 km altitude and has a life span of five years. It circles around the Earth in 97 minutes and makes 15 rounds a day.

Adenosine triphosphate, (ATP), energy-carrying molecule found in the cells of all living things. ATP captures chemical energy obtained from the breakdown of food molecules and releases it to fuel other cellular processes.

Largest planet is the Jupiter and Pluto is now categorized as microplanet

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