- 8th Quadrilateral8th Quadrilateral andParallelogram8th Exponents and Radicals8th Profit and Loss8th Discounts and Sales Tax8th Percentage Commercial MathsFurther Reading postQuadrilaterals and TheoremsRational NumbersAssignments for all ChaptersMean and MediansCompound InterestAlgebraic ExpressionSquare and square rootFactorizationCubes and Cube rootsChapter: Probability-1Chapter: Probability-2Oral Questions Geometry8th Value based Maths QuestionsDirect and Inverse ProportionsMensuration Solved QuestionsLinear Equation solved QuestionsLinear Equation solved QuestionsSample Papers Class 8th MathsCBSE 8th CHAPTER: PercentageFactorization and Ratiocination8th Algebraic Expression8th Time and Work-1Compound InterestStaticsVolume and surface Area
1. Force , Frictions ad PressureAssignment By Physics AddaNotes and Key conceptCalculate Net force WorksheetForce friction and pressure NotesYou may also like2. Stars and The Solar SystemSolved Questions Download6. Light and Our EyesTest paper -1Test Paper-2Solved question3. Sound , Wave ,Music and Noise4. Chemical Effects of Electric Current5. Some Natural Phenomenon Like Lightning, Charging and EarthquakesChapter - Earthquake solved QuestionsChapter - Earthquake solved QuestionsQuestion BanksFor more visit: JSUNIL TUTORIALClass VIII Mathematics [Click on links given below]CBSE Class VIII Science
NCERT Activity Chapter 02 Acid Bases and Salt Class 10 Chemistry Activity 2.1 Indicator Acid Base Red litmus No Change Blue Blue Litmus Red No change Phenolphthalein Colourless Pink Methyl Orange Pink Yellow Indictors are substance which change colour in acidic or basic media. Activity 2.2 There are some substances whose odour changes in in acidic or basic media. These are called olfactory indicators. Like onion vanilla, onion and clove. These changes smell in basic solution. Activity 2.3 Take about 5 mL of dilute sulphuric acid in a test tube and add few pieces of zinc granules to it. => You will observe bubbles of hydrogen gas on the surface of zinc granules. Zn + H2SO4 --> ZnSO4 + H2 => Pass the Hydrogen gas through the soap solution. Bubbles formed in the soap solution as Hydrogen gas it does not get dissolved in it
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Q. Rubber suckers are usually used to hold objects with the help of suctions. Give reason?
Answer: When we press the sucker, most of the air between its cup and the surface escapes out. The sucker sticks to the surface because the pressure of atmosphere acts on it. If there is no air between the cup and the surface, than it would be impossible to pull the sucker off the surface.
who discovered the penicillin?
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