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Gyansthali Public School, Mahoba, , Max. Time- 1 hour Class IX- P.A. 3 Max. Marks-20, , oF ONS, , ils, , Subject - Science, Section A (1 Mark Only), , What is relative density? Write its SI unit., , Define cation and anion with one example of each., , What is atomic mass and molecular mass?, , State law of constant proportion., , Which one of the following disease is not transmitted by mosquito?, , (a) Typhoid = (b) Dengue. (c) Malaria. (d) Brain fever, Viruses, which causes hepatitis are transmitted through (a) Air (b) Water. (c) Food (d) Personal, , Section B (2 Marks Only), , The gravitational force between two objects is 2F. How will the force change, when the distance between them is reduced to half., Calculate the number of water molecules in 24g of water., Make the chemical formula of given compounds showing cross multiplication of, valencyAluminium sulphate, Sodium Hydrogen Carbonate, Zinc Hydroxide, Sodium, Sulphide, , Define Immunity and Immunization., , What are acute and chronic diseases?, , Section C (4 Marks), , A man throws the ball vertically upwards and it comes back to his hands after, 8sec. Find, (a) the velocity with which it was thrown up,, , (b) its position after 6 seconds, , (c) the maximum height covered by ball