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Draw a force diagram of the arrangement and B. Calculate the weight of the ruler. And also 3| C. Calculate the force with which pivot is pressed. by the formula 2K/V, whereK:Kinetic quantity obtained Give name and SI unit of physical 12| energy, : Linear velocity Calculate: long inclined plane by an cffort of 25 N. m 10 a on up raised is kg 50 mass A barrelof A. The vertical height through which barrel rises [2| B. Gradient of inclined plane. [g = 10m/s ] Name the subjective property of A. Sound related to its frequency |2} III/ IV. V. B. Light related to itswavelength executing free vibration. A. Drawa graph between displacement and time for a body VI) B. Where can a body execute free vibration? the final temperature of S0gof ice at 0 C is added with 300 g of aliquid at 30 C, What will be VII. 121 oC while the mixture if all ice has melted? Given: specific heat capacity of liquid is 2.65 J gl [2] that of water is 4.2 J g C,specific latent heat of fusion of ice is 336 Jg [2] Calculate the resistance between the points X and Y in the network shown below: 22 39 312 Section -B (Attempt any four questions) |3+3+4=10] Question 4: . The diagram given below illustrates the experimental set up for the determination of the focal length of aconverging lens using a plane mirror. A. State themagnification of the image formed. B. State two characteristics of image formed. C. To which point (left of O, on O or right of O) will the rays return if M is moved to the left and brought in contact with L? the corresponding A radio can tune in toany station in 7.5 MHz to 12 MHz band, what is wavelength band? l. The diagram below shows the displacement-time graph for avibrating body. A. Name thetype of vibrations produced by the vibrating body. B. Give one example of a bodyproducing such vibrations. C. Why is the amplitude of the wave gradually decreasing? sometime? D. What will happen to the vibrations of the body after |3+3+4=10| halfof steel. Weights of copper and steel are 9 In a meter rod half of it is made of copper and rest of the rod at its geometric center? If not, where is N and 8N respectively. Is the center of gravity uestion 5: it? II. II. Explain the following: surrounded by lumps of ice than iced water A. Bottled drinks are cooled more effectively when B. Why does atmospheric temperature fall after a hail storm? cold countries? C. Why does the weather become pleasant when it starts freezing in ampere flows through the 5 Three resistors are connected as shown in the diagram. A current of I ohm resistor as shown in the diagram. I ampere 52 B 13 2 A. What is the current through the other two resistors? B. What is the potential difference across AB and AC? C. What is the total resistance of the combination? |3+3+4=10] Question 6: 1. Utam and Nitesh are standing at a distance of 12 m and 20m respectively trom achtt. They start shouting their names. They want to hear clear echo of their sound. A. Will Nitesh and Utam be able to hear aclear echo of their ownsound? { Clifr 20 I |1. III. forn an ccho. B. Explain the condition for a sound to gives ofT three types of radiations. A mixture of radioactive substances A. Name the radiation similar in nature to X -rays. magnctic field. B. Name the radiation which is deviated most in a electric field. C. Nanme the radiation which is not affected by an a of heat capacity 50J C containing I.0 kg oi A heating coil is immersed in a calorimeter temperature of liquid rises by 10 C when 2 Iiquid of specific heat capacity 450 Jkg c.The A current is passed for 10 minutes. Find: A. The resistance of the coil assumption used in your calculations. B. The potential difference across the coil. State the |3+3+4=10| LQuestion 7: Ablock and tackle system has a velocity ratio 3. clearly the points of A. Draw a labelled diagram of this system. In your diagram, indicate application and the directions of the load and effort. B. Why should the lower block of this pulley system be of negligible weight? marked as 1, 2, 3 The diagrams (a) and (b) given below are of a plug and a socket with arrows against the and 4, 5, 6 respectively on them. Identify and write Live L, Neutral N and Earth E correct number. (b)Sockct (a) Plug III. In the given figure A, B and C are three ammeters. The ammeter B reads 0.5 A. (All the ammeters have negligible resistance but the cell has an internal resistance of I ), Calculate: 20 32 A. The readings in the ammeters A and C. { 8 total resistance of the circuit. B. The C Emfofcell. Ouestion8: [3+3+4=10] Araindrop of mass I g falling from rest from aheight 1 km hits the ground with the speed Ol 0 m/s. Calculate: 1. A. Loss in potential energy. B. Gain in kinetic energy. C. Is gain in kinetic energy equal to the loss in potential energy? If not, why? [g = 10 m/s J 90 Th undergoes several disintegrations and ultimately decays to 83 Bi 222. How many alpha and beta particles are emitted? In the following ray diagram, calculate the speed of light in the liquid of unknown refracti ve III. index. 30 cm cm 40 4+Liquid Question 9: (3+3+4=10] A man uses a crowbar of length 1.5 m to raise a load of 75 kgf by putting a sharp edge below the bar at a distance of l m from his hand. A. Draw a diagram of the arrangement showing the fulcrum (F), load (L) and effort (E) with their directions. B. State the kind of the lever. C. Calculate mechanical advantage. A house has main fuse of 5A rating. 5 bulbs each of 60 Wand 2 fans each of 40 W are used simultaneously. Find: A. The current drawn from the mains of 220 V. B. The number of additional bulbs each of100 W which can also be lighted? III. ARay PO is incident normally on the face AB of a triangular prism of refracting angle of 60e, the figure. made ofa transparent material of refractive index 2/V3, as shown in Also calculate: A. Trace the path of the ray as it passes through the prism. B. The angle of emergence, and C Angle of deviation. A
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