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Shri Vile Parle Kelavani Mandal s C.N.M. School and N.D. Parkeh Pre-primary School Std: X MUST KNOW QUESTIONS (PHYSICS) 2016-17 Question 1: i. Differentiate between: (a) contact and noncontact forces. (b) centripetal and centrifugal force. ii. State the general character of non-contact forces. iii. State the factors affecting the turning point of a body. iv. State the conditions necessary for a body to be in equilibrium. v. Can the moment of force be zero even if force is not zero? If so, when ? vi. Derive the relation between newton and dyne. vii. Define: (a) C.G. (b) moment of force. (c) force. viii. A uniform meter scale balances horizontally on a knife-edge placed at 55 cm mark when a mass of 25 g is suspended from one end. Draw a diagram of this arrangement. Calculate the mass of the scale. ix. What is the position of C.G. of: (a) circular disc. (b) hollow cone (c) triangular lamina. x. A spanner has a long handle. Why? Question 2: i. Differentiate between: (a) work and power.(b) kinetic and potential energy.(c) renewable and non renewable energy. ii. Derive relation between joule and erg. iii. The work done by a fielder when he takes a catch in a cricket match, is negative. Explain. iv. A pump is used to lift 500 kg of water from the depth of 80 m in 10 s. Calculate: (a) the work done by the pump (b) the power at which the pump works (c) the power rating of the pump if its efficiency is 40% (g = 10 ms -2). ________________________________________________________________________________________________________ Std: X Physics page 1
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