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Sample Test Papers ( Science )

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Published in: Science
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Science, Class IX, CBSE Board

Arun M / Faridabad

4 years of teaching experience

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Teaches: Mathematics, IIT JEE Mains

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  1. SCIENCE TEST - 3 TOPICS : Work & Energy, Thrust & Pressure, Atomic Structure Class General Instructions : J) All questions are compulsory. 2) Each question carry EQUAL marks Time 2.0 HRS 1. a) b) c) 2. 3. 4. 5. 6. 7. 8. Answer the followings - When do we say that work is done? Define 1 J of work. Can there be displacement of an object in the absence of any force acting on it ? Define isotopes and isobars. List three important uses of isotopes. A ball is dropped vertically from the rest at a height of 12 m. After striking the ground, it bounces back to a height of 9 m. What fraction of kinetic energy does it lose on striking the ground ? Prove that the work done is equal to the change in Kinetic Energy of an Object. ( Let mass of object is m, its initial velocity is, u and final velocity is, v ) Momentum of a body is increased by 20 %. Calculate the percentage increase in its K.E. What do you mean by buoyancy? Why does an object float or sink when placed on the surface of liquid ? State Archimedes Principle. Meena noted following observations in her note book : a. Weight of the stone in the air = 272 gwt b. Weight of the stone in Water = 192 gwt c. Weight of the stone in salt solution = 176 gwt. The relative density of the salt solution is? A car and a truck have kinetic energies of 8 x 105 J and 9 x 105 J respectively. If they are brought to halt at the same distance, find the ratio of forces applied to both the vehicles. While determining the density of the material of body a student recorded the following observations ( a ) Mass of the body = 62.4 g, ( b ) Reading of water level in the measuring cylinder without body = 16.4 ml, ( c ) Reading of water
  2. 9. level in the measuring cylinder with body = 24.4 ml. Based on these observations find the density of the material of the body? Describe the structure of atom as proposed by Neil 's Bohr. How does this model rectify the defects of Rutherford' s model? 10. The element Boron occurs in nature as two isotopes having atomic masses of 10u and 1 lu. What are the percentage abundances of these isotopes in a sample of boron having average atomic mass of 10.8 u? 11. The ion of an element has 3 positive charges. Mass number of the atom is 27 and the number of neutrons is 14. What is the number of electrons in the ion ? 12. 24Mg and 26Mg ( Atomic no. 12 for both ) are symbols of two isotopes on magnesium. Compare these isotopes with respect to the following a) Composition of nuclei. b) Electronic configuration and valance. c) Chemical properties. d) Physical properties. 13. Derive a relation between power, force and velocity. The work done by heart is 1 J per beat. Calculate the power of the heart if it beats 72 times / minute. 14. A piece of iron of density 7.8 x 10-3 kg / m3 and volume 100 cm3 is totally immersed in water. Calculate (a) the weight of iron piece in air (b) the up thrust and (c) apparent weight in water.
  3. N/A

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