Dear students!
You should answer the following questions as 3rd question of final control.
Each student must choose and answer only 10 questions.
Press the button «Ответить» and write the answer number.
YAKUNIY NAZORAT VARIANTLARI
1-variant
- Yog’och hujayralarining o’zaro o’xshash va farqli jihatlarini izohlang.
- Yog’och gidrolizi
- Yog’ochga kimyoviy ishlov berishni SWOT tahlil qiling.
2-variant
- Yog’och va po’stloq tarkibidagi selluloza, gemiselluloza va ligninni Venn diagrammasi asosida izohlang.
- Yog’ochni yong’indan himoyalash
- Yog’och tarkibidagi sellyulozani SWOT tahlil qiling
3-variant
- Yog’och tarkibidagi ekstraktiv moddalarni klasterli sxema tarzida ifodalang va sxemani izohlang.
- Yog’och hujayralari
- Tolali yog’och kompozitlarini Venn diagrammasi asosida tahlil qiling
4-variant
- Yog’ochni kimyoviy tahlil qilish usullarini klasterli sxema tarzida ifodalang va sxemani izohlang.
- Yog’och qatlamli kompozitlar
- Yog’ochni gazlashtirishni SWOT tahlil qiling
5-variant
- Yog’ochni ekstraksiyalash, kul miqdorini aniqlash, xoloselluloza olish usullariga moslik testi tuzing.
- Yog’och pirolizi
- Yog’ochning kul tarkibini aniqlash muammosiga keys topshirig’i ishlab chiqing.
6-variant
- Yog’och qatlamli kompozitlarni klasterli sxema tarzida ifodalang va uni izohlang.
- Yog’och hujayralari qobiqlarining tuzilishi
- Biomassani torrefikatsiyalashni SWOT tahlil qiling
7-variant
- Yog’och hujayralari qobiqlarining tuzilishiga oid moslik va ketma-ketlik testlari tuzing.
- Yog’och tarkibidagi ekstraktiv moddalar
- Yog’ochning kimyoviy tarkibini sxema tarzida ifodalang va uni izohlang.
8-variant
- Yog’ochni yoqishni SWOT tahlil qiling
- Yog’ochni kimyoviy tahlil qilish
- Yog’ochdan xoloselluloza olish jarayonida qo’llaniladigan kimyoviy asbob-uskunalarni ta’riflarn.
9-variant
- Yog’och gidrolizini SWOT tahlil qiling
- Yog’och qirindili va tolali kompozitlar
- Yog’och hujayralarining qobiqlari tuzilishini o’rganishga oid ko’p javobli, moslik va ketma-ketlik testlari tuzing.
10-variant
- Yog’och pirolizini SWOT tahlil qiling.
- Yog’ochni ekstraksiyalash, kul miqdorini aniqlash, xoloselluloza olish
- Qirindili yog’och kompozitlarini klaster sxemasi tarzida ifodalang va ularni izohlang
1) In which answer are the chemical elements, containing in the wood indicated?
A) hydrogen, carbon, oxygen, nitrogen
B) hydrogen, carbon, oxygen
C) cellulose, hemicellulose, lignin, extractive substances
D) trunk, branches, root
B
2) Which chemical element contains in the wood more than others?
A) Hydrogen
B) Carbon
C) Oxygen
D) Alkaline-earth metals
B
B
3) Which element contains in the wood ash more than others?
A) Carbon
B) Hydrogen
C) Nitrogen
D) Alkaline-earth metals
D
4) Indicate the chemical substance, which isn’t contained in porous wood?
A) shellac
B) suberin
C) glucose
D) pentosane
A
5) Which chemical substance is soluble in water?
A) shellac
B) suberin
C) paints
D) gum
A
C
6) Which chemical substance is soluble in alcohol?
A) shellac
B) gemicellulose
C) paints
D) tannids
A
A
7) Which chemical substance includes turpentine?
A) terpenes
B) arabinogalactan
C) paints
D) tannins
A
8) What is the difference between cellulose and hemicellulose?
A) state of matter
B) color
C) different chemical elements
D) molecular mass
C
D
9) What substance is the most resistant to impact acids and alkalis?
A) cellulose
B) shellac
C) lignin
D) extractive substances
A
10) Indicate the aromatical substance, which is contained in wood?
A) cellulose
B) shellac
C) lignin
D) extractive substances
C
11) What percentage of carbon is contained in wood?
A) 49-50
B) 43-44
C) 6-7
D) 34-36
A
12) What percentage oxygen is contained in wood?
A) 49-50
B) 43-44
C) 6-7
D) 34-36
B
13) What is the order of the process of obtaining wood without resin?
A) extraction with toluene, extraction with ethanol, washing with hot water
B) humidification, chlorination, washing with ethanol, rinsing with cold water, repeating these operations again
C) treatment with peracetic acid, filtration, washing with hot water, drying.
D) boiling in a nitric-alcoholic mixture, analysis of the presence of lignin, washing with hot water.
14) Indicate the substance, which is contained in bark, but isn’t contained in wood.
A) tannide
B) quinine
C) gum
D) rosin
A
15) Indicate the device, which is used in the extraction process.
A) filter of the Shott
B) funnel of the Buchner
C) apparatus of the Soxhlet
D) flask of the Bunsen
D
16) What determines the temperature of the environment during the extraction process?
A) temperature of substances
B) solvent content
C) concentration of extractables
D) type of solvent
17) Indicate the procedure for determining the ash content of wood.
A) The burning of wood — cooling — the separation of ash
B) Drying sawdust — slow burning — cooling
C) Slow burning of sawdust — calcination — cooling
D) Wood burning — ash extraction — cooling
18) Indicate the units, which are included to the wood cellulose?
A) galactan
B) glucosidic residues
C) hemicellulose
D) extractives
C
19) Which part of the cellulose is more resistant to acids?
A) glucosidic bonds
B) hydroxyl groups
C) methylol groups
D) carbonyl groups
A
20) Indicate a water-soluble copolymer, which is contained in hemicelluloses.
A) mannan
B) arabogalactan
C) rosin
E) xylan
C
21). Identify the substance with the greatest polydispersity.
A) cellulose
B) hemicellulose
C) lignin
D) suberine
C
22). What is the color of lignin in wood?
A) from light yellow to dark brown
B) the black
C) lignin is colorless
D) similar to the color of wood
A
23). Which substance reacts rapidly with chlorine?
A) lignin
B) cellulose
C) pentosans
D) hexosans
A
24). Which parameter reduces the adhesion of glue to the contact surface of the wood?
A) surface area
B) base thickness
C) presence of oils
D) applied force
25). Whish parameter refers to the wood, in terms of adhesion?
A) solvent
B) porosity
C) pressing time
D) resistance to hydrolysis
B
26). Which parameter refers to the glue, in terms of adhesion?
A) resistance to hydrolysis
B) wettability
C) modulus of elasticity
D) amount of solvent
A
27). Which parameter refers to the glue, in terms of adhesion?
A) hydrogen index
B) bio resistance
C) roughness
D) base thickness
C
28). Which adhesive has a good adhesion to the wood?
A) carbamide-formaldehyde
B) epoxy
C) polyurethane
D) polyvinylchloride
B
29). Which adhesive has a good adhesion to the wood?
A) epoxy
B) polyurethane
C) phenol-formaldehyde
D) carboxymethyl cellulose
A
30). Which adhesive has a good adhesion to the wood?
A) casein
B) rubber glue
C) polyurethane
D) polyvinylchloride
A