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(This question paper contains three printed pages) REHEARSAL TEST (2016-2017) SUBJECT:-- Physics. CLASS:--X. FULL MARKS:- 80. TIME:-- 2 hrs (Two Hours) Answer to this Paper must be written on the paper provided separately. You will not be allowed to write during the first 15 minutes. This time id to be spent in reading the Question Paper. The time given at the head of this Paper is the time allowed for writing the answers. Section 'is compulsory. Attempt any four questions from Section II. The intended marks for the questions or parts of the questions are given in brackets [J. Section - I (Compulsory) ~tate one factor on which the magnitude of a non-contact force depends. How does it depend on the factor stated by you? [2] ~ame ~n and define the S.I. and C.G.S. units of force. How are they related? [2] a see-saw, two children of masses 30 Kg and SOKg are sitting on one side of it at distances 2 m and 2.5 m respectively from its middle. Where should a man of 74 Kg sit to balance it? (2] . J9)'1 What is the position of centre of gravity of a: (i) Rectangular lamina (ii) Cylinder? (2] (~it possible to have an accelerated motion with a constant speed? Name such type of motion. [2] work done by a fielder when he takes a catch in a cricket match is negative. Explain. [2] ~he ~ boy of mass 40 Kg runs up a flight of 15 steps, each 15 cm high in 10 seconds. Find: [2] (if the work done and (if( the power developed by him. (c) A'A what way does the temperature of water at the bottom of a water fall differ from the temperature at U the top? Explain the reason. (Q)/J( cannon ball of mass 500 gm is fired with a speed of 15 m/sec. momentum. ~' [2] Find: (i) its kinetic energy and (ii) its [2] State two limitations of using wind energy for generating electricity. ~aYCompare ~hy (i) the ionizing power (ii) the penetrating power of a, ~ and" radiations. are the alpha particles not used in radio therapy? .(.c(How can the rate of emission of electrons in a cathode ray tube be increased? ~State two properties which a substance used as a thermionic emitter should possess. [2] (2] [2] [2] [2] ~ What is a carbon tax? Who shall pay this tax? [2] ~~tate the law of conservation of energy. [2] Page -1 of 3.
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