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It is usually taken by students during the final two years of Senior secondary school (Grade 10 & 11 (usually ages 15–16)) or external (non-school) candidate. The exam is usually held in December. The exams are held in three mediums Sinhala, Tamil and English.
Inhalation overexposure causes primarily central nervous system (CNS) effects (headaches, dizziness, nausea, fatigue, and incoordination). In general, the toxicity is more pronounced with petroleum ethers containing higher concentrations of aromatic compounds. n-Hexane is known to cause axonal damage in peripheral nerves. [3]
Students in Grade 13 had the second-highest depression and anxiety scores, with examination-related issues being the most commonly cited problem. Of the 445 students assessed, 22.9% of Grade 12 students and 28.6% of Grade 13 students reportedly had severe depression , while 28.6% of Grade 12 students and 32.1% of Grade 13 students experienced ...
The Scottish equivalent was the O-grade (replaced by the Standard Grade). The AO-Level (Alternative Ordinary Level) was formerly available in most subject areas. Sometimes incorrectly known as the Advanced Ordinary Level, the AO-Level syllabus and examination both assumed a higher degree of maturity on the part of candidates, and employed ...
Hexane and other volatile hydrocarbons (petroleum ether) present an aspiration risk. [26] n-Hexane is sometimes used as a denaturant for alcohol, and as a cleaning agent in the textile, furniture, and leather industries. It is slowly being replaced with other solvents. [27] Like gasoline, hexane is highly volatile and is an explosion risk.
These results suggest that other components found in petroleum benzine may have additive, synergistic or potentiative effects on the biological effects of n-hexane. [7] Namely, 1000 ppm n-hexane, 3000 ppm n-heptane, and 1000 ppm toluene were reported to have depressing effects on the body weight gain of rats. [8]
3.307 022 307 057 62 × 10 25: C 59 H 120: n-nonapentacontane: 60 2.215 873 453 577 04 × 10 22: 1.042 501 343 360 61 × 10 26: C 60 H 122: n-hexacontane: 61 5.985 809 784 770 69 × 10 22: 3.288 633 820 091 64 × 10 26: C 61 H 124: n-henhexacontane 62 1.618 057 253 492 97 × 10 23: 1.038 111 737 095 70 × 10 27: C 62 H 126: n-dohexacontane 63 4 ...
Education in Sri Lanka has a long history that dates back two millennia. While the Constitution of Sri Lanka does not provide free education as a fundamental right, the constitution mentions that 'the complete eradication of illiteracy and the assurance to all persons of the right to universal and equal access to education at all levels" in its section on directive principles of state policy ...