All CBSE Schools are conducting the SA1 (First Summative Assessment) in the month of September (Kendriya Vidyalayas have already started). At this point, we found it would be useful to the students to have a set of sure shot questions. Practising these will essentially help you score better marks in the forthcoming exams.
Portions for SA1
MOTION, FORCE AND WORK (Motion, Force and Newton’s Laws of motion, Gravitation)
Long Answer Type Questions
 Derive equations of uniformly accelerated motion using graphical representation of motion.
 Derive F=ma
 State the law of conservation of linear momentum. Illustrate with an example
 State and explain Archimedes’ principle.
 Describe an experiment to verify Archimedes’ principle.
 Distinguish density and relative density.
 What are the effects produced by force?
 What is friction? How is it caused? How can it be reduced?
 Define impulse of a force.
 Why does a cricket fielder pulls his hands backwards while taking a catch?
 Define inertia and explain its types with suitable examples.
 Describe two instances each where pressure is increased by decreasing the area and pressure is decreased by increasing hte area.
 State Newton’s universal law of gravitation
 Define G.
 Distinguish g and G
 Why motion and rest are said to be relative terms?
 Define acceleration due to gravity at a place and discuss its variation with height, depth and latitude.
 Write the differences between mass and weight.
 Can an object be accelerated if it is moving with constant speed? Justify your answer with an example
 Why is a person hurt more when he falls on a concrete floor than when he falls on a heap of sand from the same height?
 The weight of an object on the surface of moon is 1.67N and its mass on its surface is 1 kg. Calculate its weight and mass on the surface of earth, (g on earth = 10 m/s2).
 When a horse suddenly starts running, a careless rider falls backwards. Explain why?
 State the action and reaction in the swimming action of a swimmer.
 A stone is thrown vertically upwards with a velocity of 40 m/s and is caught back. Taking g=10 m/s2, calculate the maximum height reached by the stone.What is the net displacement and the total distance covered by the stone?

Read more at: http://www.icbse.com/papers/cbsesamplepaper2011scienceclassix
Read more at: http://www.icbse.com/papers/cbsesamplepaper2011scienceclassix
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THIS MATERIALS ARE VERY USEFUL THANX