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पूर्वावलोकन भाग-7, ,General Science (अंग्रेजी संस्करण)-भूल-सुधार,2018

  • Generally those elements whose atomic number is above 83 are considered as redioactive elements except-Technetium (Te) Atomic No. 43 and promethium (pm)-Atomic number 61. these both are radioactive elements whose atomic number is less than 83. According to question No. 44 on the page No.-94. Zirconium whose atomic No. is 40 is not a radioactive substance while Astatine (atomic No. 85) and Francium (atomic number 87) are radioactive elements. Tritium is a radioactive isotope of Hydrogen.
  •  The explanation of the question No. – 9, of the page No.-24 read as follows. If no air resistance is present. the rate of descent depends only on how for the object has fallen, no matter how heavy the object is. This means that two objects will reach the ground at the same time, if they are dropped simultaneously. In case of a piece of wood, wax and iron dropping air resistance is small as compared to the force of gravity that pulls them to the ground, So all the things will reach simultaneously on the earth surface.
  • पूर्वावलोकन General Science 2018 The answer of Q. No. 36 on Page No. 228 will be (*) instead of option – (d) because all the options are correct. Addition in explanation – streamlining body means less aerodynamic drag and thereefore less fuel is needed to propel a car forward.
  • The given  answer option C, of Q. No. 230 on page No. 406 is correct.The new explanation is as follows-The stimulus for flowering which are light energy and carbon dioxide are received by the leaves of a plant. Apart from light and chemical stimulus for flowering temperature is also one important stimulus that a lot of species use to flower, example some orchid species.
  • Purvavlokan General Science Question No. 20 on page no. 211. The answer of this question should be read as option (a) instead of option (b):Sodium bicarbonate or anhydrous sodium bicorbonate is also known as baking soda, used in preparation of baking product. It is also used in fire extinguisher. Bleaching powder is prepared in Hansclaver plant. Statement 1, 2, 3 are correct.
  • पूर्वालोकन जनरल साइंस अंग्रेजी संस्करण Option (a) is correct answer instead of the option (d) of Q. No. 104 on Page No51.The new explanation is as follows- The amount of light entering the eye through people is controlled by iris. But this adjusment takes some time, our eyes can not see everything clearly, when we enter a darkroom from a bright light. The reason for this is that in bright light , the size of pupil of our eye is small. When we enter in dark room due to small size of pupil very little light enters in our eyes. But after some time, the pupil expands and we become able to see things as more light enters in to eyes.
  • पूर्वालोकन जनरल साइंस अंग्रेजी संस्करण Option (c) is correct instead of option (d) of Q.No. 21 on Page No. 23.The new explanation is as follows-Every liquid element attains an equilibrium position under the action of gravity and pseudoforce. If tanker accelerates, free surface of the tanker will not be horizontal because pseudo force acts.
  • पूर्वालोकन जनरल साइंस अंग्रेजी संस्करण  Option (c) is correct instead of Option (d) of Q. No. 112 on Page No. 52.

       Explanation of Assertion (a) of Q. No. 15 Page No. 22. “The first statement can be explained on the basis of Newtonian’s third law of motion- for every action there is equal and opposite reaction. In this case while whisteling a man uses his breath as propellant to propel himself forward.”

  • पूर्वालोकन-7 (अंग्रेजी संस्करण)  Genral Science  page no. 192. Q.34 More elaborative explanation required. G 196-Q.no. is wrong. It should be 20 not 58. G-200-Q.n. 16-in place of graphite it should be graphene.
  • पूर्वावलोकन भाग-3 (अंग्रेजी संस्करण) (General Science) पेज संख्या G-13 पर प्रश्न संख्या 35 के विकल्प (d) में Fermimetre के स्थान पर Fenitometre पढ़ा जाए।

व्याख्या — ‘Fermimetre’ at all the places in the explanation to be read as fenitometre.

  • पूर्वावलोकन-7 विज्ञान, अंग्रेजी संस्करण, 2019 में पेज संख्या 155 पर प्रश्न संख्या 62 का विकल्प (c) त्रुटिपूर्ण है, जो इस प्रकार है। It was Successfully test fired from Bay of Bengal 21 March, 2010 इस प्रकार इस प्रश्न के दो विकल्प (c एवं d) गलत होंगे।
  • पूर्वावलोकन-7 विज्ञान (अंग्रेजी संस्करण-2018) में पेज संख्या 24 पर प्रश्न संख्या 9 का उत्तर विकल्प (d) के स्थान पर विकल्प (a) पढ़ा जाए। इसी प्रश्न की व्याख्या के लिए पेज संख्या 25 पर प्रश्न संख्या 10 की व्याख्या देखें।
  • पूर्वावलोकन 7 Science (अंग्रेजी संस्करण-2018) में पेज संख्या 198 पर प्रश्न संख्या 2 की व्याख्या में ऊपर से तीसरी पंक्ति में Organic के स्थान पर inorganic पढ़ा जाए।
  • पूर्वावलोकन-7 विज्ञान (अंग्रेजी संस्करण)-2018 में पेज संख्या 52 पर प्रश्न संख्या 112 का संशोधित उत्तर विकल्प इस प्रकार है- the Answer should be read as option (c) instead of option (d).
  • पूर्वावलोकन-7 अंग्रेजी संस्करण-2018 पेज संख्या-G191 प्रश्न संख्या-27 का उत्तर व्याख्या इस प्रकार है-Mica is a bad conductor of electricity but Conductor of heat. Examples of good conductors of electricity are Aluminum, brass copper iron, steel etc. Examples of bad conductors of electricity are Acrylic, china clay, glass, mica, plastic etc. generally good conductors of electricity are also good conductors of heat and vice versa.
  • पूर्वावलोकन-7 अंग्रेजी संस्करण-2018 पेज संख्या-G69 प्रश्न संख्या-1 का उत्तर विकल्प-(d) के स्थान पर (b) पढ़े।
  • पूर्वावलोकन-7 अंग्रेजी संस्करण-2018 पेज संख्या-241 प्रश्न संख्या-46 का उत्तर विकल्प-(a) के स्थान पर (d) पढ़े।
  • पूर्वावलोकन-7 अंग्रेजी संस्करण-2018 पेज संख्या-241 के प्रश्न संख्या-46 के उत्तर में विकल्प (d) के स्थान पर विकल्प (a) पढ़ा जाये।
  • पूर्वावलोकन भाग-7 (अंग्रेजी संस्करण) में पेज संख्या-381 प्रश्न संख्या-38 की संशोधित व्याख्या-World T.B. Day-24 March Anti Leprocy Day-31 January (Last Sunday of January)
  • पूर्वावलोकन-7 अंग्रेजी संस्करण-2018 पेज-संख्या-25 के प्रश्न संख्या-10 में The two balls—- के पूर्व In the Presence of air जोड़ें।
  • पूर्वा० 7 (अंग्रेजी संस्करण-2018) में पेज संख्या 275 पर प्रश्न संख्या 5 में संशोधित व्याख्या इस प्रकार है – ‘The number of bones in an adult human body is 206’. The body of a child has about 300 bones at birth.