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Class X Subject Physics (SCIENCE Paper 1) Time allowed: 2hrs Maximum Marks: 80 Attempt all the questions from Section I and any four questions from Section II. The intended marks for questions or parts of questions are given in brackets [ ]. SECTION I (40 Marks) Attempt all questions from this Section. Question 1 (a) Which of the following physical quantities have same units? [2] (i) Force & Momentum (ii) Force & Torque (iii) Momentum & Energy (iv) Torque & Energy (b) A bullet is fired into an object and stopped. Which forms of energy is the mechanical energy (kinetic energy) of the bullet converted into? [2] (c) Mention the mechanical advantages of class I, class II and class III levers. [2] (d) Relate the SI unit and gravitational unit of force. [2] (e) Give one example of a no-work force with explanation. [2] Question 2 (a) Relate the horse power with the SI unit of power. [2] (b) A particle of mass 2 g is moving with uniform speed 20 m/sec along a straight line. Find its kinetic energy. [2] th (c) Light travels in a medium with a speed 3/4 times its speed in vacuum. Find the refractive index of the medium. [2] (d) Write down the conditions for total internal reflection. [2] (e) Draw a labelled diagram to show 90 deviation ( = 90 ) of a ray with the help of a right angled prism. [2] Question 3 (a) Determine the resistance of the conductor from the following current voltage (I V) graph? [2] V (Volt) 20 15 10 5 1 2 3 4 5 6 I (Amp)
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