Haemorrhoid are dilated portions of the veins in the anal canal are varicosities in the superior or inferior haemorrhoidal venous plexus. Dilation and enlargement of the superior haemorrhoidal venous plexus above the dentate line cause internal haemorrhoid. Enlargement of the…
Pilonidal Cyst (Sinus)
Pilonidal Cyst / Sinus is found in the intergluteal cleft on the posterior surface of the lower sacrum polonidal cyst Latin meaning ‘hair nest’ is a blanket term for any type of skin infection near the tail bone (coccyx). Incidence;…
Colo-rectal Cancer
Colo-rectal cancer is a malignant neoplasm that affects the layer, lower portion of the intestinal tract. Also called colon cancer or bowel cancer, includes cancerous growth in the colon, rectum and appendix. It is the third most common form of…
Yahoo! Stops Its Email Service in China
Yahoo! is one of the famous companies which have been providing various vital services to the internet users all over the world. Being launched in March 1994, it is very popular due to the wide variety of services it provides.…
HSEB Model Question Set 1 (Chemistry) – Grade 11
Time: 3 hours Full Marks: 75 Pass Marks: 27 Group ‘A’ Attempt any fifteen questions. (2 × 15 = 30) 1. Calculate the percentage of sulphur in Na2S2O3 (Na = 23, S = 32 and O = 16). [Ans: 40.5%]…
Different Grades of Purity of Alcohol
Alcohols are one of the widely used organic compounds. They are the organic compounds which contain hydroxyl (-OH) group as their functional groups. In other words, alcohols can be defined as the hydroxyl derivative of aliphatic hydrocarbons. Alcohols are represented…
HSEB Model Question Set 1 (Biology) – Grade 12
Time: 3 hours Full Marks: 75 Pass Marks: 27 Section A (Botany) 1. Answer any seven questions in very short. (1 × 7 = 7) a. Write the function of xylem. b. Name the components of a nucleotide. c. Give…
Motion of An Electron in Electric Field
Let us consider that, an electron of mass ‘m’ moves with initial horizontal velocity ‘vx‘. While the electron enters the electric field between the parallel plates, it is attracted towards the upper positive plate. The electrostatic force with which electron…
Indicators and Titration Curves
Indicators are the chemical substances which are used to determine the end points of titrations. Methyl orange, phenolphthalein, starch solution, erichrome black-T are some examples of indicators. Indicators are used in acid-base titration and have different colours in acidic and…
Hall Effect
When magnetic field is applied perpendicular to a current carrying conductor, then voltage is developed across the conductor in the direction perpendicular to both current and magnetic field. This effect is called Hall effect. Let us consider a rectangular cross…
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