l  A fountain pen works on the principle of capil-   Biology
       lary action.
                                                            l  Iodized salt is beneficial for thyroid function.
    l  Pycnometer is an instrument used to measure
                                                                               Success Tip
                                                          Iodised salt is table salt mixed with a minute
    l  Fibre-Optics works on the principle of Total In-
                                                          amount of various salts of the element iodine. Defi-
       ternal reflections.
                                                          ciency of iodine also causes thyroid gland problems,
    l  A decibel is a measure of sound level.             including “endemic goitre”.
Chemistry                                                   l  Lac is produced from an insect.
    l  Bhopal gas tragedy is associated with methyl         l  Quarantine regulation is concerned with the
       isocyanate.                                             prevention of entry of diseased organism.
                       Success Tip                                             Success Tip
 Methyl isocyanate is an intermediate chemical in         Quarantine regulation is used to separate and re-
 the production of carbamate pesticides. It has also      strict the movement of persons; it is a ‘state of en-
 been used in the production of rubbers and adhe-         forced isolation’. This is often used in connection to
 sives. As a highly toxic and irritating material, it is  disease and illness, such as those who may possibly
 extremely hazardous to human health.                     have been exposed to a communicable disease.
    l  The acid rain destroys vegetation because it con-    l  Toxicology is related to the study of poisons.
       tains sulphuric acid.                                l  Adrenaline hormone is released in excess quan-
    l  The source of sun’s energy is nuclear fusion.           tity during excitement.
    l  Nuclear reactors used to produce electricity are     l  Water in plants is transported by xylem.
       based on nuclear fission.                            l  Bat can hear ultrasonic sound.
                       Success Tip                          l  Scientific study of birds is known as ornitholo-
 Both fission and fusion are nuclear reactions that
 produce energy, but the applications are not the           l  Python is a non poisonous snake.
 same. Fission is the splitting of a heavy, unstable        l  Penicillin is used in the treatment of tubercu-
 nucleus into two lighter nuclei, and fusion is the            losis.
 process where two light nuclei combine together re-        l  Sour milk contains lactic acid.
 leasing vast amounts of energy.                            l  Alum stops bleeding in minor cuts because of
    l The substance most commonly used as food pre-            coagulation.
       servative is acetic acid.
    l Catalyst is a substance which does not take part
       in the re act ion as a r eac tant. It i s not        l  Countries of south Asia in descending order of
       changed by the reaction or used up during               their population literacy
       the re act ion. It is st ill the re in t he             Sri Lanka>India>Pakistan>Bangladesh
       same form when the reaction is complete.             l  The common currency which has been introduced
    l Carbon monoxide is the most toxic gas.                   among 19 European nations is known as Euro.
    l Skin of the human body is the first most affect-
                                                                               Success Tip
       ed part by nuclear radiation.
                                                          The euro is the official currency of the Euro zone,
    l Sulphuric acid is used in the lead storage cells.
                                                          which consists of 19 of the 28 member states of the
    l Tincture iodine is a solution of potassium io-
                                                          European Union: Austria, Belgium, Cyprus,
       dide.                                              Estonia, Finland, France, Germany, Greece, Ireland,
                       Success Tip                        Italy, Latvia, Lithuania, Luxembourg, Malta, the
 Tincture of iodine or iodine tincture is an antiseptic   Netherlands, Portugal, Slovakia, Slovenia, and
 it is also called weak iodine solution                   Spain.
    l  ‘Plaster of Paris’ is made by partial dehydration    l  Darwin is called the “Greatest investigator of
       of gypsum salt.                                         antiquity”.
    l  Water can be separated from alcohol water mix-       l  An expert in precious stones and the art of stone
       ture by distillation.                                   cutting is known as lapidary.
                                                            l  List- 1 (Names)           List-2 (Events)
                       Success Tip
                                                               Hobbes                    Execution of Charles 1
 Distillation is a process of separating the component
                                                               Rousseau                  French Revolution
 or substances from a liquid mixture by selective evap-
 oration and condensation.                                     Locks                     Glorious Revolution
                                                               Hitler                    Second World War
    l  Milk sugar is Lactose.