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ICSE Board Exam 2016 : Physics

7 pages, 73 questions, 73 questions with responses, 504 total responses,    0    0
Srujan Deshpande
Sri Chaitanya Techno School, Bangalore
XI-XII PCM, IP, English
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PHYSICS SCIENCE Paper -I (Two hours) Answers to this Paper must be writlen on the paper provided separately. l'ou will not be allowed to write during the first I5 minutes. This time is to be spent in reading the Question Poper. The time given at the head of this Paper is the time allowed Section I is compulsory. Attempt any The intended marl<s four questions for writing the answers. from Section II. for questions or parts of questions are given in brockets I J. SECTION I (40 Marks) Attempt all questions from this Section. Question (a) (i) (ii) I Give an example of a-non contact force which is always of attractive nature. tzl How does the magnitude oittrls non contactJbrceon the two bodies depend on the distance of separation between them? (b) A boy'weighing and a (i) 40kgf climbs up a stair of 30 steps each 20cm high in 4 minute 121 girl weighing 30kgf does the same in 3 minutes. Compare:- The work done by them. (ii) The power developed (c) by them. With reference to the terms Mechanical Advantage, Velocity Ratio and t2) efficiency of a machine, name and define the term that will not change for a machine of a given design. (d) Calculate the mass of ice required to lower the temperature of 3009 of water at 40oC to water at 0oC. (Specific latent heat of ice:336 J/g, Specific heat capacity of water:4.2 llg"C) 521 This Paper consists of 7 printed pages and T16 O Copyright reserved. I blank page. Turn over tzl (e) t2) What do you understand by the following statements: (i) The heat capacity of the body is 60 JK-r' (ii) The specific heat capacity of lead is 130 Jkg-t6-t' Question 2 (a) State rr,yo factors upon which the heat absorbed by a body depends' t21 (b) A boy uses blue colour of light to find the refractive index of glass' He then repeats the experiment using red colour of light. Same or (c) t2) Will the refractive index be the different in the two cases? Give a reason to Support your answer' Copy the diagram given below and complete the path of light ray till it emerges 12) the out of the prism. The critical angle of glass is 42". In your diagram mark angles wherever necessary. (d) State the dependence of angle of deviation: (i) (e) On the refractive index of the material of the prism' (ii) t21 On the wavelength of tight. The ratio of amplitude of two waves is 3 : 4. What is the ratio of their: (i) t2l loudness? (ii) frequencies? Question 3 (a) State rwo ways by which the frequency of transverse vibrations of a string can be increased. T16 521 stretched l2l (b) What is meant by noise pollution? Name one source of sound causing noise tzl pollution. (c) The V-l graph for a series combination and for a parallel combination of two l2l resistors is shown in the figure below. Which of the two A or B, represents the parallel combination? Give a reason for your answer. x (d) A music system draws a current of 400 mA when connected to a 12 V battery. (i) What is the resistance of the music system? (ii) 121 The music system is left playing for several hours and finally the battery voltage drops and the music system stops playing when the current drops to 320 mA. At what battery voltage does the music system stop playing? (e) Calculate the quantity of heat produced in a20 Q resistor carrying 2.5A current tzl in 5 minutes. Question 4 (a) l2l State the characteristics required of a good thermion emitter. (b) An element zSA decays to rsR222 after emitting2 a particles and I B particle. l2l Find the atomic number and atomic mass of the element S. (c) A radioactive substance is oxidized. Will there be any change in the nature of 12) its radioactivity'? Cive a reason for your answer. (d) State the characteristics required in a material to be used as an effective fuse L2) rvire. (e) Which coil of a step up transformer is made thicker and why? T16 52r t21 Turn Over SECTION II (40 Marks) Attempt any four questions from this Section Question 5 (a) A stone of mass'm' is rotated in a circular path rvith a uniform speed by tying a i3l strong string with the help of your hand. Answer the following questions: (i) (ii) Is the stone moving with a uniform or variable speed? Is the stone moving with a uniform acceleration? In which direction does the acceleration act? (iii) (b) What kind of force acts on the hand and state its direction? From the diagram given below, answer the questions that follow: (i) What kind of pulleYs are A and B? (ii) t3l State the purpose of PulleY B. (iii) What effort has to be applied at C to just raise the load L=20kgfl (Neglect the weight of pulley A and friction). (c) (i) An effort is applied on the bigger wheel of a gear having 32 teeth. It is used 14l to turn a wheel of 8 teeth. Where is it used? (ii) A pulley system has three pulleys. A load of 120N is overcome by applying an effort of 50N. Calculate the Mechanical Advantage and Efficiency of this system. Question 6 (a) (i) (ii) (iii) T16 521 What is the principle of method of mixtures? What is the other name given to it? Name the law on which the principle is based. 13l (b) Some ice is heated at a constant rate, and its temperature is recorded after every t3l few seconds, till steam is formed at 100oC. Draw a temperature time graph to represent the change. Label the two phase changes in your graph. (c) A copper vessel of mass 100 g contains 150 g of water at 50oC. How much ice t4l is needed to cool it to 5'C? : Specific heat capacity of copper : 0.4 J g-r og-t Specific heat capacity of Given water : 4.2 Specific latent heat of fusion of ice: I g'r og r 336 J g-1 Question 7 (a) (i) Write a relationship between angle of incidence and angle of refraction for t3l a given pair of media. (ii) When a ray of light enters from one medium to another having different optical densities it bends. Why does this phenomenon occur? (iii) Write one condition where it does not bend w,hen entering a medium of different optical density. (b) A lens produces a virtual image between the object and the lens. (i) Name the lens. (ii) (c) t3l Draw a ray diagram to show the formation of this image. What do you understand by the term 'Scattering of light'? Which colour of t4l white light is scattered the least and why? Question 8 (a) (i) Name the waves used for echo depth sounding. t3l (ii) Give one reason for their use fbr the above purpose. (iii) (b) (i) (ii) T16 521 Why are the waves mentioned by you not audible to us? What is an echo? t3l State two conditions for an echo to take place. Turn Over (c) (i) Name the phenomenon involved in tuning a radio set to a particular station. (ii) t4l Define the phenomenon named by you in part (i) above. (iii) What do you understand by loudness of sound? (iv) In which units is the loudness of sound measured? Question 9 (a) (i) (ii) Which particles are responsible for current in conductors? To which wire of a cable in a power circuit should the metal case of t3l a geyser be connected? (iii) To which wire should the fuse (b) (i) be connected? Name the transformer used in the power transmitting station of a power t3l plant. (ii) What type of current is transmitted from the power station? (iii) At what voltage is this current (c) available to our household? A battery of emf l2V and interhal resistance 2 Q is connected with two resistors A and B of resistance 4 O and 6 Q respectively joined in series. 4Q 6Cl Find: (i) Curent in the circuit. (ii) The terminal voltage of the cell. (iii) The potential difference across 6C) Resistor. (iv) Electrical energy spent per minute in 4Q Resistor. T16 521 t4l Question 10 (a) Arrange o, B and y rays in ascending order with respect to their (i) Penetrating power. (ii) t3l Ionising power. (iii) Biological effect. (b) (i) In a cathode ray tube what is the function of anode? (ii) State the energy conversion taking place in a cathode ray tube. (iii) t3l Write one use of cathode ray tube. (c) (i) Represent the change in the nucleus of a radioactive element when a B particle is emitted. (ii) What is the name given to elements with same mass number and different atomic number? (iii) Under which conditions does the nucleus radioactive? Tt6 52t of an atom tend to be t4l

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