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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

Qualification:

Teaches: Mathematics, IIT JEE Mains

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  1. SCIENCE TEST - 1 TOPICS : Work & Energy, Thrust & Pressure Class General Instructions : J) All questions are compulsory. 2) Each question carry EQUAL marks Time 1.5 HRS 1. a) b) c) d) 2. 3. 4. 5. 6. 7. 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 ? A person holds a bundle of hay over his head for 30 minutes and gets tired. Has he done some work or not? Justify your answer. Write the expression for work done by a force, F acting on an object at an angle a with the displacement, S of the object. An object of mass, m is moving with a constant velocity, v. How much work should be done on the object in order to bring the object to rest ? 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 ) 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. Two bodies of masses ml and m2 have equal kinetic energies. What is ratio of their linear momentum? Ramesh was walking on a road in the morning. He found that an old man was lying on the road side. Ramesh touched the body of the old man. His body was very cold. Ramesh rubbed the hands and feet of the old man. The old man opened his eyes. Ramesh helped the old man to reach his home. Answer the following questions based on above paragraph, a) Why hands become warm when rubbed ? b) What values are shown by Ramesh ? What do you mean by buoyancy? Why does an object float or sink when placed on the surface of liquid ? State Archimedes Principle.
  2. 8. 9. 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 level in the measuring cylinder with body = 24.4 ml. Based on these observations find the density of the material of the body? Relative densities of two substances A and B are 2.5 and 0.9 respectively. Find the densities of A and B. Also find whether they will sink or float in water. ( Density of water is 1000 kg / m3 ) 10. 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?

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