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ICSE Prelims 2016 : Science (Anand Niketan, Ahmedabad)

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Sanhit Mehta
Anand Niketan, Shilaj, Ahmedabad

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ANAND NIKETAN SCHOOL - SHILAJ PAPER-1 SUBJECT PHYSICS STD:- X DATE:-____/_____/__ M.M:-80 Marks DURATION:-2Hrs. (Candidates are allowed additional 15 minutes for only reading the paper. They must NOT start writing during this time) SECTION-I (Compulsory: To be attempted by all candidates) [40 Marks] Question:1. (a) (b) (c) (d) (e) How is the acceleration produced in a body of given mass related to the force applied on it? [2] A tennis ball and a table tennis ball have same momentum. Which of the two has more kinetic energy and why? [2] In the following cases write yes if the work is being done and no, if no work is being done. (i) A man trying to push a wall. (ii) A man moving on the rough ground. (iii) A coolie standing with a heavy load on his head. (iv) A boy climbing up a staircase. [2] When an arrow is shot from its bow, it has kinetic energy. From where does it get the kinetic energy? [2] State two reasons, why the efficiency of a pulley system is not 100%. [2] Question:2. (a) (b) (c) (d) (e) Draw ray of light bending towards the normal while passing from(i) air to glass, (ii) glass to water. Label your diagrams. [2] In What condition a prism is said to be in the position of minimum deviation? What is the direction of the refracted ray inside the prism in this condition? [2] Define power of a lens . [2] What happens to the image formed by a convex lens if its lower part is blackened? [2] State two uses of ultraviolet radiations. [2] Question:3. (a) (b) (c) (d) (e) What is the voltage and frequency of the electricity that is generally supplied to a house? [2] A given wire is stretched to double its length. How will its resistance change? [2] What are non ohmic conductors? Give one example. Draw a current voltage graph for a non ohmic conductor. [2] Why is the filament in an electric bulb coiled? [2] State the purpose served by the terminals of a three pin plug. [2] Question:4. (a) (b) (c) (d) (e) Calorimeter are made of copper, Explain the reason. Explain the statement: The specific latent heat of vaporization of water is 2260 x 103 J/kg . What are the types of emission? What are cathode rays? Why are they called cathode rays ? How does the position of an element change in the periodic table when it emits out an alpha particle? SECTION-II (Answer any four questions from this section) [2] [2] [2] [2] [2] [40 Marks] Question:5. (a) A bullet of mass 50g is moving with a velocity of 500 m/s. It penetrates 10 cm into a target and comes to rest. (i) Calculate the KE possessed by the bullet. (ii) The average retarding force offered by the target. [4] Page 1 of 3 (b) (c) (i) What is the work done by the gravitational force on the moon that revolves round the earth? (ii) A coolie, with a load of 30 kg on his head, walks on the platform. If he walks a distance of 60 m, what is the work done by him? (iii) A bullet fired against a window glass pane makes a hole in it without any crack, while a stone striking the same glass pane smashes it; explain with reason. [3] (i) In the lever(mass-less) shown in figure what is: (1) the clockwise moment about the fulcrum F,(2)the anticlockwise moment about F and (3) the relation between clockwise and anticlockwise moment? Assume that the fulcrum is frictionless. (ii) How do you define mechanical advantage of a machine? Calculate the mechanical advantage of the lever shown in figure. [3] Question:6. (a) (b) (c) (i) Explain briefly what causes the twinkling of stars at night. (ii)A glass slab is placed over a page on which the word VIBGYOR is printed with each letter in its corresponding colour.(I) Will the image of all the letter be in the same place? (II) If not, state which letter will be raised to the maximum. Give a reason for your answer. [4] The adjacent diagram shows two right angled isosceles prisms A and B. Complete the diagram to show the path of rays P and Q emerging out of the prism B. What principles have you used to complete the diagram? [3] Diagram shows an object AB placed on the principal axis of a convex lens placed in air. F1 and F2 are the two foci of the lens. Copy the diagram: (i) Draw a ray of light starting form B and passing through O. Show the same ray after refraction by lens. (ii) Draw another ray from B which passes through F2 After refraction by the lens. (iii) Locate the final image. [3] Question:7. (a) (b) (c) (i) Define the term resistivity and state its SI unit. (ii)State the factors on which the resistivity of a wire depends. In the figure below, the ammeter A reads 0.3A. Calculate: (i) The total resistance of the circuit (ii) The value of R. (iii) The total current flowing through R. Explain the significance of kWh meter, main switch and main fuse in house circuiting. Page 2 of 3 [4] [3] [3] Question 8. (a) (b) (c) Four resistance of 2.0 each are joined end to end, to form a square ABCD. Calculate equivalent resistance of the combination between any (i) two adjacent corners (ii) two digonally opposite corner. [4] What do you understand by the term Quality of a musical note? Illustrate your answer with a diagram. [3] Write three advantages in using right angled prisms instead of plane mirror in optical instruments. [3] Question:9. (a) (i) Draw a neat and labelled diagram to show the structure of an a.c. generator. (ii)State the energy conversion taking place in the generator when it is working. (b) (c) [4] A molten metal weighing 150g is kept at its melting point 800 0C. When it is allowed to solidify at the same temperature, it gives out 75000 J of heat. What is the specific latent heat of the metal? If its specific heat capacity is 200J/kg K, how much additional heat will it give out in cooling to -50 0C ? [3] What do you mean by dispersion of light? Explain its causes. [3] Question10. (a) (i) Draw a labelled diagram of a hot cathode ray tube. (ii)Why are material of low work function preferred as thermionic cathode materials? (b) (i)A thorium isotope [4] 233 90 Th undergoes an - decay and changes to radium Ra. What is the atomic number and mass number of radium produced? (ii) If the radium undergoes a further disintegration and emits two - particles, represent the reaction in the form of an equation. [3] (c) (i) Name the principle on which functioning of a transformer depends. (ii) What is the function of a step- up transformer? (iii) Can a transformer work when it is connected to a D.C source? [3] ************************************************End****************************************************** Page 3 of 3

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