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Posted Date: 05 Aug 2009 Posted By: aryadeb banerjee Member Level: Silver
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2009 ICSE Sample Paper – 2009. subject -physics Question paper
Subject – Physics
Section – I [40 Marks]
Attempt all questions from this section
Q. 1 (a) A tennis ball and a table tennis ball have the same momentum, which of the two has more kinetic energy and why? [2]
(b) Comment on the statement “The mechanical advantage of a machine is greater than one”? [2]
(c) Air bubbles emerging out of a fish tank appear silvery. Why? [2]
(d) Define Angle of deviation? [2]
(e) During ß emission, how do the following change: [2]
(i) Mass number of radioactive element?
(ii) Atomic of radioactive element?
Q. 2 (a) Differentiate between free vibrations and forced vibrations with examples? [2]
(b) Name two factors on which lateral displacement depends upon? [2]
(c) An effort of 25kgf acts on a barrel of 200kgf which is rolled up on an inclined plane through a vertical height of 1.5 m. Calculate the distance through which the force acts? [2]
(d) State the principle of AC generator? [2]
(e) State two ways of increasing thermonic emission from an emitter? [2]
Q.3 (a) A cell of emf 1.5 V is connected to an external resistance of 2 O when the PD at the ends of the resistance is 1.2 V. Calculate the internal resistance of the cell? [2]
(b) (i) What is Ideal mechanical advantage of a machine? [2]
(ii) What is the relationship between mechanical advantage and velocity ratio for an ideal machine and a practical machine?
(c) What type of lens is used and where should the lens be placed to get a: [2]
(i) Point size image
(ii) Magnified image
Explain with diagrams?
(d) Distinguish between heat and temperature? [2]
(e) State the principle of reversibility of light? [2]
Q. 4 (a) A transformer looses emf from 220V to 15V.If 400 watts power is given in primary. Calculate [2]
(i) The current in primary coil?
(ii) The current in the secondary coil?
(b) Why are athletes advised to put on extra clothes after competing in an event? [2]
(c) State three actions that a total reflecting prism can produce and where are they used? [2]
(d) Name a radiation [2]
(i) With maximum ionizing power?
(ii) With shortest wavelength?
(iii) Deflected to the maximum extent by electric and magnetic fields?
(e) Draw a labeled diagram of a transformer used to convert 1100V AC to 220 V. What is the expected energy loss in the system? [2]
Section – II [40 Marks]
Attempt any 4 questions from this section
Q. 5 (a) What do you mean by RADAR? [2]
(b) The particles of mud fly off tangentially from the wheel of a moving vehicle. Why? [2]
(c) State two differences between emf and terminal voltage? [2]
(d) Why is the base of an electric iron made thick and heavy? [2]
(e) Define Work function and what is the effect of particles emitted from the cathode if [2]
(i) A hotter filament is used?
(ii) The anode voltage is increased?
Q. 6 (a) Show the block and tackle of pulley system having velocity ratio 5.Indicate Load effort and tension in the string? [2]
(b) Define resistivity with its S.I. units? [2]
(c) Write two uses of radio isotopes?
(d) RI of water with respect to air is 4/3 while that of glass with respect to air is 3/2.Find RI of glass to water? [2]
(e) How does the following affect the loudness of the note: [2]
(i) Amplitude?
(ii) Distance between observer and source?
Q.7 (a) KwH and eV are the units of? [1]
(b) What do you mean by earthing? [2]
(c) Define latent heat of vaporization of steam? [2]
(d) A metal drill of power 500W, drills a hole in a metal cube of mass 0.2 kgs in 6.5 secs. The specific heat capacity of lead is 130Jkg-1C-1. [3]
(i) How much heat is generated by metal drill in one second?
(ii) Calculate the heat generated in 6.5 secs?
(iii) If t°C is the rise in temperature of the metal cube. State the amount of heat energy absorbed by it in terms of t. Write down the equation and calculates t?
(e) The stem of the vibrating tuning fork is put on to a top of a table: [2]
(i) Is the table set into vibrations. If yes name them?
(ii) Under what conditions, we observe resonance in such cases?
Q. 8 (a) Write the factors on which heat absorbed depends upon? [2]
(b) Write the characteristics of a fuse and under what conditions can the fuse melt? [2]
(c) Why is household wiring done in parallel? Give at least two reasons? [2]
(d) Why does weather become pleasant when it starts freezing in cold countries? [2]
(e) A boy stands in front of a cliff, on the other side of a river; He fires a gun and hears an echo after 6 seconds. The boy then moves 170m backwards and again fires the gun, He hears an echo after 7 seconds. Calculate the width of river and speed of sound? [2]
Q. 9 (a) Mention two sources of background radiations? [2]
(b) Draw a diagram using system of house wiring for distribution of electric power? [2]
(c) Calculate the amount of heat produced per second in calories when a ¬¬¬___ of 50W, 200V glows, assuming only 16% of electricity is converted to ¬¬¬¬_____.(1 cal= 4.2 Joules)? [2]
(d) Why do we prefer magnifying glass of smaller focal length? [2]
(e) Do you hear an echo in a small room? Explain? [2]
Q.10 (a) What happens to a light ray during minimum deviation position in a prism? [2]
(b) A bi-convex lens is used as a projector lens. Explain the statement diagrammatically? [3]
(c) A ray of light is entering a glass slab from an air medium. Does it travel with the same speed through the glass? Represent it by a diagram marking its angle of incidence and angle of refraction and explain the same? [3]
(d) State three actions that a total reflecting prism can produce and where are they used? [2]
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