Cryogenics is the branch of physics that deals with
- A.Very high pressures
- B.Very low temperatures
- C.Crystal structures
- D.Cosmic rays
Correct answer
Explanation
The correct answer is B, very low temperatures. Cryogenics deals with the production of very low temperatures and with the behaviour of materials at those temperatures, where liquefied gases such as liquid nitrogen, oxygen and hydrogen are used; it is applied in rocket engines with cryogenic upper stages, in superconducting magnets and in the preservation of biological material, which is cryobiology. Option A is wrong because the study of matter under very high pressure belongs to high pressure physics and to geophysics, not to cryogenics. Option C is wrong because crystal structures are the subject of crystallography. Option D is wrong because cosmic rays belong to astroparticle physics, and the branch dealing with the nucleus is nuclear physics. A further point is that India's own cryogenic upper stage, developed for its launch vehicles, is the standard application asked in papers, and that liquid nitrogen boils at about minus one hundred and ninety six degrees Celsius.
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Practice Questions
View allThe branch of science that deals with the study of fungi is called
- A.Phycology
- B.Mycology
- C.Bryology
- D.Pteridology
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Mycology is the study of fungi, the group that includes moulds, yeasts, mushrooms and the rusts and smuts that attack crops, and a specialist in it is called a mycologist.
Read the full explanation →Ornithology is the branch of science concerned with the study of
- A.Insects
- B.Fishes
- C.Birds
- D.Reptiles
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Ornithology is the study of birds, their classification, habits, migration and nesting; Salim Ali, known as the birdman of India, was the country's best known ornithologist and wrote the Book of Indian Birds.
Read the full explanation →Which branch of science deals with the study of earthquakes?
- A.Seismology
- B.Volcanology
- C.Speleology
- D.Geodesy
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Seismology is the study of earthquakes and of the passage of seismic waves through the earth, and it is from seismic wave records that the layered structure of the interior of the earth has been worked out; the instrument used is the seismograph.
Read the full explanation →The study of fossils is known as
- A.Palynology
- B.Palaeontology
- C.Pedology
- D.Petrology
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Palaeontology is the study of fossils, the preserved remains or traces of organisms of past geological ages, and it supplies the evidence on which the history of life and the theory of evolution rest.
Read the full explanation →Sericulture is the rearing of which of the following?
- A.Honey bees
- B.Silkworms
- C.Earthworms
- D.Fish
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Sericulture is the rearing of silkworms for the production of raw silk, and it includes the growing of mulberry, on whose leaves the mulberry silkworm feeds; India produces mulberry silk as well as the wild varieties tasar, eri and muga, the last being special to Assam.
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