Question

Water in the waterfall flows from a higher level to the lower level because of ______. 2) Electron, proton, neutron are the types of______ in an atom. 3) The intermolecular force is ____ in the particles of solid. B] State true or false: [3 Marks] 1) Tomato wilt is a viral disease. – 2) Water does not get polluted by washing the clothes in running water of river- 3) The electron shell K is farthest from the nucleus- C] Odd man out: [2 Marks] 1) Milk, lemon juice, carbon, steel- 2) Ductility, brittelness, sonority, malleability - Q. II A] Give reasons (Any 3) [6 Marks] 1) Atom is electrically neutral. 2) The load carrying heavy vehicles have large number of wheels. 3) Copper and brass vessels are cleaned with lemon. 4) Hydrogen is combustible, oxygen helps combustion, but water helps to extinguish fire. B] Define (Any 2) [2 Marks] 1) Isotopes 2) Pollution 3) Homogeneous mixture C] Differentiate between- (Any 2) [4 Marks] 1) Metals and Non-metals. 2) Water pollution and Air pollution. 3) Atomic number and Mass number. Q. III] Answer the following (Any 6) [12 Marks] 1) Draw a neat labelled diagram of Rutherford’s scattering experiment 2) Draw diagrammatic sketch of electronic configuration of Magnesium (Atomic number 12). 3) The density of a metal is 10.8 x 103 kg/ m3. Find the relative density of the metal. (Density of water is 103 kg/ m3)​

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