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Biofuel is fuel that is produced through contemporary processes from biomass , rather than by the very slow geological processes involved in the formation of fossil fuels , such as oil .

Biofuel also called as agrofuel and is derived from biomass and may be in solid , liquid or gaseous form . The use of waste biomass to generate energy can decrease waste management problems , pollution , greenhouse gaseous emissions and the use of fossil fuels .

Carbon monoxide poisoning typically occurs from breathing in carbon monoxide (CO) at excessive levels . Symptoms are often described as “flu-like” and commonly include headache , dizziness , weakness , vomiting , chest pain , and confusion . Large exposures can result in loss of consciousness , arrhythmias , seizures , or death .

Carbon monoxide primarily causes adverse effects by combining with hemoglobin to form carboxy hemoglobin (HbCO) preventing the blood from carrying oxygen .

An alloy is an admixture of metals, or a metal combined with one or more other elements .
Brass is a metal alloy that is always made with a combination of copper and zinc .
Gunmetal is composed of 88 % copper , 10 % tin , and 2 % zinc .
Steel is an alloy of iron and carbon containing less than 2% carbon and 1% manganese and small amounts of silicon , phosphorus , sulphur and oxygen .

?Disorder of articulation: It includes distortion, omission, addition or substitution of speech sounds and mispronunciation of entire word or words.

?Delayed speech: It may be due to hearing loss, mental retardation, cerebral dysfunction, emotional disturbances and environmental deprivation.

?Stammering is a speech disorder in which the flow of speech is disrupted by involuntary repetitions.

? Binge drinking is defined as a case of excess drinking of alcohol.

? A speech handicapped child is one whose speech deviates so far from the speech of other people, that it calls attention to itself, interferes with communication or causes discomfort or distrust to the speaker or listener.

?Stammering is a speech disorder in which the flow of speech is disrupted by involuntary repetitions.

?The force of attraction between any two bodies in this universe is known as Gravitation.

?The gravitational force was discovered by sir Isaac newton.

?The weakest force in nature is the gravitational force.

? The escape velocity of earth: 11.2 km/sec

?The escape velocity of moon :2.38 km/sec

?Jupiter is the planet having highest escape velocity (59.5 km/sec)

Acids react with most metals to form a salt and hydrogen gas. For example, zinc metal reacts with hydrochloric acid, producing zinc chloride and hydrogen gas.

Copper does not react with non-oxidising acids like hydrochloric acid or dilute sulfuric acid.

Eutrophication is the process in which a water body becomes overly enriched with nutrients , leading to plentiful growth of simple plant life . The excessive growth (or bloom) of algae and plankton in a water body are indicators of this process .

The detergents contain phosphates which pose a threat to the environment . Phosphates cause eutrophication in natural waterbodies .

Atomic number is the number of protons in the element and mass number is the sum of protons and neutrons present in the element. therefore number of neutrons= mass number(A) – atomic number(Z). Here atomic number of gold is 79 and mass number of gold is 197.
Therefore number of neutrons in gold atom = 197-79 =118.

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