8 Class 08 Maths and Science CBSE, NCERT Solution
- 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
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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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