Sunday, June 16, 2019

Pysics - Light Part II

Convex Lens
  •  A lens is a transparent material with two surface with atleast one surface is curved
  • The point at which lens concentrate light rays that pass through it is called : Focus
  • The lens which is thicker at the center and narrower at the edges : Convex Lens
  • Convex lens is also known as : Converging lens
  • The lens in human eye is : Convex Lens
  • The image formed in convex lens is : Real and Inverted
  • The lens used in telescopes, microscope, magnifying glass, camera etc is : Convex Lens
  • The focal length of the convex lens is : Positive
  • The power of convex lens is : Positive 
  • The inability to see the objects nearby is called : Long Sight 
  • Long sight can be rectified using : Convex Lens




Concave Lens
  • The lens in which the narrower at center and thicker at edges is : Concave Lens
  • Concave lens is also called : Diverging Lens
  • The image formed in concave lens is : small, virtual and erect
  • The focal length of a concave lens is : Negative
  • The power of concave lens is : Negative
  • The inability to see the distant objects clearly is called: Short Sight 
  • Short sight can be rectified using : Concave Lens
  • Power (P) of the lens is inversely proportional to Focal length (f), ie  P = 1/f
  •  The condition in which the pressure inside eye is higher than normal : Glaucoma
  • Mirror Equation : 1/u + 1/v = 1/f




Related Post :


  1. Physics : Light (Part - I)


    Tuesday, June 4, 2019

    Circulatory System - Blood

    • Blood is also known as : River of Life
    • Study of blood : Haematology
    • Blood circulation was discovered by : William Harvey
    • pH value of blood : 7.4 (Alkaline)
    • Viscosity of blood : 4.7
    • Normal blood pressure of human body : 120/80 mm Hg (120 mm Hg is Systolic pressure (contraction) and 80 mm Hg is Diastolic pressure (relaxation)
    •  Condition known as silent killer : Hypertension (High Blood Pressure)
    • The instrument used for measuring blood pressure : Sphygmomanometer 
    • Sphygmomanometer was invented by : Julius Harison
    • Tissue in liquid form is : Blood
    • Liquid portion of the blood is : Plasma
    • Level of Plasma in blood is : 55 % 
    • Leve of water in Plasma : 90 %
    • Hormones are transported through : Blood
    • Blood is a _____ tissue : Connective
    • Blood delivers nutrients and oxygen to the cells and removes metabolic waste products from the cells
    • Blood Proteins (Plasma Proteins) are : Albumin, Globulin and Fibrinogen
    • Blood proteins are secreted by : Liver
    • Plasma protein which controls the blood pressure : Albumin
    • Plasma proteins which acts as a antibodies : Globulins
    • Plasma proteins which helps in clotting of blood : Fibrinogen
    • Fluid which found outside the cells are called : Extra Cellular Fluid
    • Plasma without clotting factor : Serum
    • Three types of blood cells : Red Blood Corpuscles (RBC), White Blood Corpuscles (WBC) and Platelets
    • Red Blood Corpuscles are called : Erythrocytes
    • White Blood Corpuscles are called : Leucocytes
    • Platelets are also known as : Thrombocytes
    • RBC are produced in : Bone Marrow
    • Organ konown as Blood Bank : Spleen
    • The red colour of blood is due to the presence of pigment called : Haemoglobin
    • The instrument used for measuring Haemoglobin count is : Haemometer
    • The process of formation of blood cells is called : Hemopoiesis
    • Haemoglobin is also called : Respiratory Pigment
    • Haemoglobin contains : Iron
    • Haemoglobin helps in transportation of : Oxygen
    • Which organ is known as 'Graveyard of RBC : Spleen
    • The disease caused by the deficiency of RBC : Anaemia
    • Abnormal rise in total count of RBC : Polycythemia
    • Blood cells having no nucleus : RBC and Platelet
    • The only mammal having nucleus in RBC : Camel
    • Blood cells which provide immunity to our body : WBC
    • Which blood cells produce antibodies : WBC
    • Life span of WBC : 10- 15 Days
    • Which blood cells have longest life span : RBC
    • Life span of RBC : 120 Days 
    • Which blood cells have shortest life span : Platelets
    • Life span of Platelets : 10 Days
    • Study of blood vessels and lymphatics : Angiology
    • Which blood cells is known as 'warrior of our body' : WBC
    • The blood cells which can move by itself : WBC
    • Disease caused by the overproduction of WBC : Leukaemia
    • The condition when WBC falls below the minimum level : Leukopenia
    • Five types of WBCs : Basophil, Eosinophil,Lymphocyte, Monocyte and Neutrophil
    • Which WBC produces antibodies : Lymphocytes
    • Largest blood cells : WBC (Leukocytes)
    • Largest WBC : Monocytes
    • Smallest WBC : Lumphocytes
    • What is the ratio of RBC and WBC in human body : 5000:1
    • Coloured connective tissue : Blood
    • Colourless connective tissue : Lymph
    • The process of blood clotting in the wound is called : Coagulation
    • The anticoagulant in blood which prevents the coagulation of blood is : Heparin
    • Heparin was produced by : Basophil
    • Clotting of blood in blood vessels is called : Thrombosis
    • Block in artery is removed by : Angioplasty
    • The metal that helps in clotting of blood is : Calcium
    • The Vitamin which helps in clotting of blood: Vitamin K
    • The condition in which the blood is prevented from clotting: Haemophilia
    • Haemophilia is a : Hereditary disease
    • Which disease is known as Christmas Disease : Haemophilia
    • World Haemopjilia Day is observed in : April 17
    • The usual quantity of blood in a normal healthy person : 5-6 litres of blood
    • The quantity of blood that can be donated at a time : 300 ml
    • Minimum age required for blood donation is : 17 years
    • A healthy person can donate blood once in: 3 or 4 months
    • How many times a healthy person can donate blood in a year : 3 to 4 times
    • The donated blood can be used for : 35 to 45 days 
    • World Blood Donation Day is observed in : June 14
    • The temperature at which blood is stored in blood bank : 4o C
    • Blood bank was invented by : Charles Richard Drew
    • The chemical substance (anticoagulant) used in blood bank : Sodium Citrate 
    • Blood vessels which carry blood from heart to different parts of the body : Arteries
    • Blood vessels which carry blood to heart is called : Viens
    • Haemophilia is a : Hereditary disease
    • The first recogonised artificial blood group is : Hemo Pure
    • Poly Heem is a : Artificial Blood


    Related Post:

    1. Blood Group