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Physics General Test (Two hours) ___________________________________________________________________________ The answers to this paper shall be written on the sheet provided separately Not following instructions written on the question paper shall result in deduction of marks. All essential working needs to be shown on the answer sheet, any deduction in the showing of marking shall be prosecuted by deductions in marks. You will not be allowed to write during the first fifteen minutes, this time is to be spent reading the question paper. The marks for the individual questions are stated in the brackets [ ] The time given at the head of the paper is for writing the answers. ____________________________________________________________________________ You will attempt all questions from Section A. You will answer the questions on the basis of the instructions given. You will attempt any four questions from Section B. You can attempt extra questions, and the markings of Section B shall be taken in accordance with the Best-of system. ___________________________________________________________________________ Question 1- Choose the correct answers. (Write the answers only) [15] i) Which of the following is not a factor affecting the internal resistance of the cell: a) The distance between the electrodes b) The temperature of the electrolyte c) Shape of the Electrodes d) Nature and concentration of the electrolyte. ii) Marcus stretches a wire between two columns with a fixed support. Marcus decides to plug the wire directly in the middle. Which type of vibration does it execute? a) Resonant Vibrations b) Natural Vibrations c) Damped Vibrations d) Forced Vibration iii) Identify the incorrect statement. 1. Lead expands of heating 2. Bismuth contracts on heating 3. The melting point of Bismuth decreases with an increase in pressure. 4. The melting point of Wax decreases with a decrease in pressure. a) b) c) d) 1 and 3 only 2 and 4 only 1 and 4 only All statements are correct. iv) An endoscope uses optical fibre to transmit high resolution images of internal organs without loss of information. The phenomenon of light that governs the functioning of the optical fibre is: a) Refraction b) Reflection c) Scattering d) Total Internal Reflection v) Ultrasonic are not used in: a) SONAR b) Sonography c) Endoscopic Sonography d) Radiography vi) A phenomenon X is not possible at ordinary temperature and pressure. Identify X . a) Nuclear Fission b) Nuclear Fusion c) Resonance d) Total Internal Reflection vii) The slope of a I-V graph gives which of the following quantities? a) Resistance b) Resistivity c) Conductance d) Conductivity viii) If the strength of the current flowing through a wire is increased, the strength of the magnetic field produced by it: a) Increases b) Decreases c) First increases then decreases d) Remains constant ix) Which of the following principles does this setup prove? a) b) c) d) Equilibrium Moments Couple Electromagnetic Induction x) A device X converts Light Energy to Electrical Energy, which could be X ? 1. Photoelectric Cell 2. Photovoltaic Cell 3. Solar Cell 4. Kerosene Lamps a) 1, 2 and 4 only b) 1 and 3 only c) 4 only d) None of the above xi) A hot iron ball of mass 0.5 kg is added to 0.5 kg of water at X C. The resulting temperature is 283K. If the temperature of the iron ball was 655 C and the Specific Heat Capacity of Iron and Water are 336 J kg K and 4.2 x 10 J kg K then find the quantity of X . a) 10 C b) 15 C c) 5 C d) 20 C xii) A radiation X causes fluorescence when exposed to a fluorescent material, Which of the following could be radiation X ? 1. Alpha 2. Beta 3. Gamma 4. X-Rays a) 1, 2 and 3 only b) 1, 2 and 4 only c) 2 and 4 only d) All of the above. xiii) An electrical appliance has a rating of 100 W. 120V. The resistance of element of application whilst in use is: a) 144 b) 124 c) 1.2 d) 9.8 xiv) An electric bulb rated 220 V, 60 W glows when connected with 220 V mains. The two bulbs of similar tendencies are connected in parallel. Calculate the power consumed: a) 60 W b) 120 W c) 15 W d) 30 W xv) An object is kept at infinity from a convex lens. What is the real life application of it? a) Magnifying Glass b) Camera Lens c) Slide Projector d) Burning Glass Question 2i) Answer the following questions: [3] a) A battalion of troops crosses a bridge. The chief of staff instructs the soldiers to break their steps. Give an appropriate reason why he did so. b) A certain sound X has a frequency of 256 Hz and a wavelength of 1.3 m. Calculate the difference that would be felt by a listener standing between the source of the sound, which is above and another a second source of sound Y which is travelling at the same speed but at a slightly different wavelength of 2.6 m. Also calculate the speed of the sound X . ii) Refer to the image given below. [2] The cut out given is of an outline of the Telangana State Lamina. State the procedure of finding the centre of gravity of the lamina. iii) Answer the following questions: [2] a) How is the ratio of the sine of incidence of the first medium to the sine of angle of refraction in the second medium related to the velocity of light in a given medium X . b) The speed of light in a medium is 2 10 km/s. What is the refractive index of the medium? iv) Answer the following questions: [2] a) When an arrow is shot from a bow, it has kinetic energy in it. From where is the kinetic energy of the bow imparted from? Explain briefly. b) A light body A and a heavy body B have the same momentum. If the ratio of kinetic energies of A and B is 5:3 then find the mass ratios of the body. v) Answer the following questions: [2] State the effect on Angle X if: a) A prism of a higher refractive index is used. b) The wavelength of the incident light is increased by 1/3rd. vi) Manav wants to use a wire for the element in an electric heater. Which wire should he use between copper and nichrome? Give a reason or your choice. [2] vii) Refer to the diagram given below: [2] a) Identify the class of the lever in the above diagram. Give any one other example of this kind of lever. b) A thick paper of mass 0.8 kgf is to be cut using the scissor of length 30 cm. Find the amount of effort which would be required for the same. Question 3i) Give appropriate reasons for the following: a) Red light is often used as a danger signal in roads, or foggy areas. b) Stringed instruments like guitars are provided with a sound box. [2] ii) Answer the following: [2] a) A modified wire of resistance 1 and of length 90 cm is decreased on itself by three times. Calculate the initial resistance of the wire. b) A current of 30 A flows in a conductor with a resistance of 10 , if the initial temperature of the conductor was 16 C and increases to 18 C, can the potential difference applied across the ends of a conductor be found out using the formula V = IR? Justify this answer. iii) Refer to the image given below. [2] A metre rod made of copper and steel as shown in the diagram. Weights of copper and steel are 10 N and 8 N respectively. With reference to the above, answer the following questions: a) Find the total mass of the rod if the weight of the copper rod is tripled. b) In the modified rod, where will the centre of gravity lie? Justify your answer. iv) A geyser is rated 2550 W, 260 V . This geyser is connected to 260 V mains. Calculate: [2] a) The current drawn b) The cost of energy per hour is 9.325, and the geyser is run for 3 days continuously, find out the total cost of energy. v) Can the specific heat capacity of a substance be: a) Zero b) Infinite Justify your answers with appropriate reasons. [2] Section B (Attempt any four questions) Question 4i) Answer the following questions: a) State Faraday s Law of Electromagnetic Induction. b) State Ohm s Law. c) Define Becquerel Rays . [3] ii) Answer the following questions: a) Illustrate using a diagram why fuses should be connected to the live wire. b) Give reason: Snow on mountains does not melt all at once. c) State any one advantage of using an electromagnet. [3] iii) Draw a block and tackle pulley system having the Velocity Ratio (V.R.) of 4. Mark the direction of Load (L), Tension (T) and Effort (E). The pulley system lifts a load of 146 N when an effort of 45 N is applied. Find: [4] a) Mechanical Advantage b) Efficiency c) Can a machine be ideal in nature? Justify. Question 5i) Refer to the image given below. [3] a) State the polarity at poles P and Q. Justify your answer. b) State any one change that will occur when the direction of current is reversed. c) What materials are used in the making of an armature of an electric bell? Give a reason why this is preferred. ii) Answer the following: [3] a) If a monochromatic beam of light undergoes minimum deviation through an equiangular prism, how does the beam pass through the prism with respect to the base? Justify your answer using a diagram. b) A child is using a spectacle with a power of -6.5 D. Find the focal length of the lens. iii) A force of 10 N is required to pull up a block of iron of mass 2 kg through a distance of 10 m along an inclined plane making an angle of 30 with the perpendicular. [4] a) Draw a diagram of the arrangement. b) Calculate the work done due to gravity on the body c) Calculate the work done by the force in pulling the block. d) Work done against the force of friction between the block and the inclined plane. Question 6i) Refer to the diagram given below. [3] Calculate: a) The equivalent resistance from A to B. b) Define: Specific Resistance. State its S.I. unit. ii) An object is placed at a distance of 12 cm of a lens which is used to make a collimator of a spectrometer. The focal length of the lens is 8 cm. [3] a) Identify the lens used. b) State the position of the image after drawing a lens diagram. c) State the nature of the image formed. iii) Answer the following: [4] a) The isotope of U decays by Alpha Emission to form a compound X . The compound X is an isotope of Thorium (Th). The compound X is further decayed by beta emissions to a compound Y , which is an isotope of Thorium itself. Write the two equations of these reactions. b) What is the name given to atoms having different numbers of protons but the same number of neutrons? Give an example of the same. Question 7i) Answer the following questions: a) Define: Electromagnetic Induction b) State the law used to determine the direction of induced current. c) State the name of any one device which works on the principle of electromagnetic induction. [3] ii) Refer to the image given below. [3] a) Copy and complete the diagram showing the reflected ray and refracted ray. b) State Snell s Law c) Use Snell s Law to calculate the refractive index of the diagram. iii) Two metals A and B have specific heat capacities in the ratio 2:3. Say, they were supplied with the same amount of heat then calculate: [4] a) State the principle of calorimetry. b) The ratio in which their temperature rises. c) Calculate the specific heat capacity of B if the specific heat capacity of A is 0.26 J K . d) A ball of metal A of mass 35 g is put in water of a temperature of 6 C, if the temperature of the resultant mixture is 25 C and if the metallic ball is placed in 2 g of water, then calculate the initial temperature of A . Question 8i) A music system draws a current of 400 mA when connected to a 12 V battery. [3] a) Calculate the resistance of the music system b) The music system is left playing for 6.5 hours and finally the battery voltage drops and the music stops playing. The current drop is at 320 mA. At what battery voltage does the music system stop playing? c) State any one factor on which the resistance of a conductor depends upon. ii) A uniform half metre ruler is in a state of equilibrium when it is perpendicular over the wooden edge of a table. Rekha notices that it is in equilibrium only when it is balanced on the 22 cm mark when a certain amount of weight is suspended from one end of the ruler. If the total weight of the ruler is 105 gf then: [3] a) Draw a neat, labelled diagram of the setup b) Calculate the weight suspended from one end of the ruler. c) Define Equilibrium. State the two types of equilibrium. iii) A person is standing at the sea shore. An observer on the ship which is anchored in between a vertical cliff and the person on the shore fires a gun. The person on the shore hears two sounds, one two seconds after firing the gun, and one x seconds after firing the gun after seeing the smoke on the gun. If the speed of sound is 320 ms in a medium and the time required for the reflected sound to be heard by an observer in the ship is 1 second, then find: [4] a) The time required for the sound to propagate through the second sound. b) The distance between the observer on the ship and the person on the shore c) The distance between the vertical cliff and the observer on shore. d) Draw a displacement-time graph for natural vibrations. Question 9i) An electric bulb rated 220 V, 60 W glows when connected to 220 V mains. [3] a) Find the resistance of the filament of the bulb. b) Another identical bulb is connected in series with the first one and the system is connected to 220 V mains. Draw a diagram of the arrangement and find the total power consumed. c) If two bulbs are connected in parallel, draw a diagram of this arrangement. What will then be their power consumed? ii) Answer the following questions: [3] a) Name the radiation used in Night Photography. b) The critical angle for glass-air is 45 for the light in yellow colour. State whether it would be less than, or equal to, or more than 45 in the cases of red light propagated and blue light propagated. c) Differentiate between Scattering of Light and Refraction of Light. iii) Radiations given out from a source when subjected to an electric field in a direction perpendicular to their path are shown in the diagram. The arrows show the path of the radiation A, B and C. Answer the following questions on the basis of A, B and C. [4] a) Name the radiation B which is unaffected by the radiation. State any one method of its detection. b) Give reason: Radiation C has the tendency to deflect more than Radiation A. c) The three radiations: A, B and C are passed through a human body, State which type of radiation will cause the most and least damage respectively. d) State the reaction of each one of A, B and C to Lead Sulphite.
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