Animal charcoal is obtained by

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RRB TC CC Exam (Bangalore) 2006 click here to view all questions

Animal charcoal is obtained by-

Athe destructive distillation of bones

Bburning the bones of animals in contact with air

Cburning the flesh of animals

Dburning the bones of animals out of contact with air

Akilesh Kharvi ? Nov 13 '2016 at 19:34

Answer is : the destructive distillation of bones

Animal charcoal is produced from bones, horn, blood, etc. Bone-black, or bone-charcoal, is obtained by the destructive distillation of bones in iron retorts, the distillate constituting bone- oil or Dippel's oil. Bone-black contains about 80 per cent, of calcium phosphate, a little calcium carbonate, some combined nitrogen, and only about 10 per cent, of carbon.

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Heavy water

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Heavy water-

Acontains more dissolved air

Bcontains more dissolved minerals and salts

Ccontains deuterium in place of hydrogen

Dcontains organic impurities

Akilesh Kharvi ? Nov 13 '2016 at 19:32

Answer is : contains deuterium in place of hydrogen

Heavy water(D2O), also called deuterium oxide, water composed of deuterium, the hydrogen isotope with a mass double that of ordinary hydrogen, and oxygen. (Ordinary water has a composition represented by H2O.) Thus, heavy water has a molecular weight of about 20, whereas ordinary water has a molecular weight of about 18

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The absolute zero of temperature is

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The absolute zero of temperature is-

Athe starting point of any scale of temperature

Bthe lowest temperature that is theoretically possible

Cthe temperature at which the vapours of all liquid substances freeze

Dthe temperature at which all substances exists in the vapour phase

Akilesh Kharvi ? Nov 13 '2016 at 19:30

Answer is : the lowest temperature that is theoretically possible

Definition: Absolute zero is the lowest possible temperature, at which point the atoms of a substance transmit no thermal energy - they are completely at rest. It is 0 degrees on the Kelvin scale, which translates to -273.15 degrees Celsius (or -459.67 degrees Fahrenheit).

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Which of the following contains a water soluble neurotoxin

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RRB TC CC Exam (Patna) 2006 click here to view all questions

Which of the following contains a water soluble neurotoxin which causes lathyrism?

AMasoor

BUrad

CMoong

DKesari

Akilesh Kharvi ? Nov 5 '2016 at 16:35

Answer is : Kesari
Lathyrism or neurolathyrism is a neurological disease of humans and domestic animals, caused by eating certain legumes of the genus Lathyrus. This problem is mainly associated with Lathyrus sativus (also known as Grass pea,Kesari Dal, Khesari Dal or Almorta).

Reference: https://en.wikipedia.org/wiki/Lathyrism

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Which of the following is a chemical change

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RRB TC CC Exam (Patna) 2006 click here to view all questions

Which of the following is a chemical change?

AEvaporation of water

BBurning of candle

CGlowing of an electric bulb

DLiquefaction of air

Akilesh Kharvi ? Nov 5 '2016 at 16:31

Answer is Burning of candle
Burning of the vapours of wax to give carbon dioxide, heat and light.

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