Formatting page ...
PHYSICS SCIENCE Paper-1 (Two hours) Answers 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 is 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. Attempt all the question from section I and any four questions from question II. The intended marks for questions or part of questions are given in []. SECTION I ( 40 MARKS) Attempt all questions from this section. Question 1 (a) (i) (ii) (b) (c) (d) (e) (a) (b) (i) (ii) (c) (i) (ii) (d) (i) (ii) With respect to a rain drop falling towards the earth answer the following What are the forces acting on it. State the type of equilibrium possessed by it. A constant force of F N acts on a body and displaces it by S m in the direction of the force in a time of t s. Write an expression to calculate (i) Work done (ii) Power developed. A Single movable pulley has an ideal mechanical advantage=2, But an actual single movable has M.A.<2. State two reasons why it is so. Why is the vessel used for measurement of heat is made of a thin sheet of copper? 4680 J of heat energy is absorbed by150 g of a substance to increase its temperature of 10 C to 90 C. Calculate the Specific heat capacity of the substance and express it in SI units. Question 2 A certain quantity of ice at 0 C changes to steam at 100 C on supplying heat energy. Draw a time- temperature heating curve representing this change and also mark the two phase changes in the graph. How does the wavelength of light get affected when light travels from optically rarer to optically denser medium? In a medium other than air if the speed of red light is 2.1x10 8 m/s. will the speed of violet light be lesser or greater than this value? Write an expression to calculate the absolute refractive index of glass in terms of its speed. What is the name given to describe the angle of incidence in the denser medium for which the angle of refraction in the rarer medium is 90 ? Write the nature and characteristics of the image formed by a lens ,given the linear magnification = +3. Name the type of lens which forms this kind of image [2] [2] [2] [2] [2] [2] [2] [2] [2]
|
