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1 LIKELY PROBLEMS IN PHYSICS FOR II PUC 1. A ray of light is incident at an angle of 30 0 on one side of a glass slab of thickness 0.05 m. The lateral shift of the ray on passing through the slab is 0.01 m. Calculate the refractive index of the slab. 2. A transparent cube of side 18 cm contains an air bubble in it. When viewed normally through one face, the bubble appears to be at 8 cm from the surface. When viewed normally through the opposite face the distance appears to be 4 cm. Calculate real position of the bubble & RI of the material of the glass cube. 3. A beaker containing water (n w = 4 / 3) is placed on a glass slab of thickness 0.1 m having refractive index 1.6. scratch at the bottom of the glass slab appears at the interface of the two media, when viewed normally. Calculate the height of water in the beaker 4. The bottom of a container is a 4 cm thick glass slab of refractive index 1.5. The container contains two Immiscible liquids A and B of depths 6 cm and 8 cm respectively. What is the apparent position of scratch on the outer surface of the bottom of the glass slab when viewed through container? Refractive indices of liquids A and B are 1.4 and 1.3 respectively. 5. A point source of light is located 1.5 cm below the surface of a lake. Calculate the radius of the circular surface that transmits all the light that emerges from the surface. Refractive index of water = 4 / A ray of light is incident on one face of an equilateral prism of glass of refractive index 1.55 at an angle Calculate the angle of deviation produced by the prism. For what other angle of incidence, the deviation will be the same? 7. A point object is placed at a distance of 1 m from the surface of a glass sphere of radius 0.2 m, on its diameter. If the refractive index of glass is 1.5, find the position of the image. 8. The greatest thickness of a plano-convex lens when viewed normally from the plane surface appears to be 8 / 3 cm and when viewed normally from the curved surface is 16 / 5 cm. If the actual thickness is 4 cm. find its radius of curvature. 9 A convex lens of focal length 0.24 m and of refractive index 1.5 is completely immersed in water of refractive index Find the change in focal length of the lens. 10. A glass sphere of refractive index 1.5 has a diameter of 0.2 m. A parallel beam is incident on the sphere. Where is it brought to focus by the sphere? 11 Where an object should be placed in front of a convex lens of focal length 0.15 m so that an image magnified 5 times is obtained? 12. Two equi-convex lenses of focal length 10 cm each are placed in contact, the space between them being 1

2 filled with water of refractive index 4/3. The water between them forms a thin equi-concave lens. Find the focal length of the combination of glass and water lenses. (refractive index of glass = 3/2). 13. In Young s double slit experiment, light of wavelength 420 nm is used to obtain interference fringes of width 6.4 mm. What should be the wavelength of the light to obtain fringes 4.6 mm wide, if the distance between the screen and the slits is reduced to half the initial value? 14. Light from a narrow slit passes through two parallel slits 0.2 cm apart. Find the wavelength of light if the interference fringes on a screen 1m distant from the two slits. Slits are 0.3 mm apart. If the whole apparatus is immersed in water of refractive index 4 / 3 find change in fringe width. 15. In Young s double slit experiment the distance of the screen from the slits is 0.5m and the distance between the slits is 1.5 mm. If the distance of the fourth bright fringe from the center of the screen is 0.8 mm calculate the wavelength of light used. What will be the distance of fifth dark fringe from the central point on the screen? 16. In Young s double slit experiment the separation between the slits is 0.6 mm. Interference pattern is obtained on a screen at a distance of 0.9 m from the plane of slits. Slits are illuminated with lights consisting of two wavelength 4800 A and B 5800 A one after the other. What is the linear separation between the 4 th dark fringes of two different patterns produced by the two wavelengths? 17. A ray of light is incident on the surface of a plate of glass at the polarizing angle. The angle of refraction is Calculate the refractive index of glass 18. Light passes successively through two polarimeter tubes each of length 0.29 m. The first tube contains dextro-rotatory solution of concentration 60 kg m -3 and specific rotation 0.01 rad m 2 kg -1. The second tube contains laevo-rotatory solution of concentration 30 kg m -3 and specific rotation 0.02 rad m 2 kg -1. Find net optical rotation Ultraviolet light of frequency 2 x Hz. is incident on a metal or threshold frequency Hz. Calculate the velocity of the photoelectrons emitted. Planck s constant = x Js. 20. Calculate the maximum velocity of a photoelectron, if the work function of the target material is 1.8 ev and wavelength of incident light is 400 nm. What retarding potential is necessary to stop the emission of these electrons. 21. If the series limit of Balmer series is at 3646 A, find the wavelength of the first line of Lyman series. 22. Hydrogen atom in its ground state is excited by means of monochromatic radiation of wavelength 975 A. How many different lines are possible in the resulting spectrum? Calculate the longest wavelength amongst them. Assume that the ionization energy for hydrogen atom is 13.6 ev. 2

3 23. Calculate the wavelength of the first member and the series limit of Lyman series of hydrogen spectrum. 24. Calculate the specific binding energies of 26 Fe 56 and 55 Cs 133. Given mass of 26 Fe 56 is amu, mass of 55 Cs 133 is amu. Mass of proton is amu and mass of neutron is amu. State which of the nucleus is more stable. 25. Calculate the energy released in joule by 0.5 mg mass U 235 in the following reaction. 92U o n 1 56Ba Kr o n 1 + Energy Give rest mass of U 235 = amu rest mass of Ba 141 = amu rest mass of Kr 92 = amu rest mass of o n 1 = amu 26. In the atomic bomb at Hiroshima, it is estimated that the energy released was 8 x J. On an average, the energy release per fission of U 235 is 200 MeV. Calculate the mass U 235 used for the bomb. 27. The number of disintegrations per minute of a sample of radioactive substance is 4750 per minute. After five minutes it is found to decrease to decrease 2700 per minute. Calculate (i) the decay constant and (ii) the half life of the radioactive substance 28. A piece wood of mass 20 gm shows an activity of 140 disintegrations per minute The living plant shows an activity of 12 disintegrations per minute per gram. If the activity is due to C 14 whose half life is 5730 years, calculate the age of the piece of wood. 29.The activity of 1 gram of radium 226 is 1 curie. Find the half life of radium. 30. Half life of U 238 is 4.5 x 10 9 years. Calculate the activity of 1 gm of U Calculate the mass in gram of 10 micro curie of cobalt 60 whose half life is 5.3 years. 32. A pendulum bob of mass 80 mg and carrying a charge of 20 nc is at rest in a horizontal uniform electric field of strength 20,000 NC -1. Find the tension in the thread of the pendulum and the angle it makes with the vertical 33. Two positive charges 9 nc and 4 nc are placed at the points A and C respectively of a right angled triangle ABC in which angle B = 90 0, AB = 3 cm and BC = 2 cm. Find the magnitude and direction of the resultant electric intensity at B. 34. Point charges of +2 nc, +4 nc and +8 nc are placed at the corners A, B and C respectively of a square ABCDof side 0.2 m. Calculate the work required to transfer a charge of 2 x 10-9 C from D to the centre of the square.charges of +25 nc, -50 nc, +75 nc and +100 nc are placed at the corners A,B,C and D respectively of a square ABCD of side 0.1 m. Find the resultant electric intensity at the center of the square. 3

4 35. A parallel plate capacitor connected to a 2 V battery collects a charge of 20 C with air as dielectric and 60 C charge with a material as dielectric. Find the dielectric constant of the material and the energy stored in the capacitor with the material as dielectric. 36. A parallel plate air capacitor consists of two plates each of area 0.01 sq.m. Separated by a distance of 0.1 mm. It is charged to a potential of 50 Volts. Calculate its capacitance, charge on it and energy stored. 37. Two capacitors of capacitances 1 micro Farad and 2 micro Farad are charged to 800 V and 400 V respectively. Find the common potential difference, the charge on each capacitor and the energy dissipated when they are connected in parallel. 38. When two capacitors are connected in series and connected across a 2 kv line, the energy stored in the system is 2 J. The same capacitors if connected in parallel across the same line, the energy stored is 9 J. Find the capacities of capacitors. 39. You are provided with 3 capacitors, each of capacitance 2 micro Farad. Show with diagrams, in how many ways they can be grouped together and find the effective capacitance in each case. 40. A parallel plate capacitor has two plates each of area 0.2 sq.m and 9 mm apart. It is filled with two slabs of thickness 4 mm and 5 mm having dielectric constants 4 and 5 respectively. Calculate its capacitance. 41. Find the drift velocity of free electrons in copper wire of area of cross section 0.2 m 2 carrying a current of 5 A assume that each copper atom provides 1 free electron for conduction. Given density of copper 9,000 SI unit and its atomic mass 63.5 g. AV no. 6 x Three resistors 3, 4, 6 in parallel the combination is connected to cell of a e.m.f 2 V internal resistance 2/3. Find current through different branches. 43. Two resistors 3 and 4 are in parallel the combination is connected to a resistance of 6 and a cell of e.m.f 2 V internal resistance 2/3. Find current through different branches. 44. A triangle ABC is formed by 3 wires AB, BC and CA each of resistances 100, 60 and 40 respectively. A cell of e.m.f 2 V internal resistance 1 is connected across BC. Find current through different parts. 45. A resistance of 9 is connected to a cell. A VM connected across it reads 1.8 V. When 10 is in series with 9 VM reading is 1.9 V. What is the reading of VM if 10 is in parallel with A 20 W, 120 V bulb and 60 W, 120 V bulb are in series across 240 V source. Find i) current through each bulb ii) power dissipated in them iii) the bulb which burns with quickly 4

5 47.Two cells of e.m.f 2 V and 4 V internal resistance 1, 2 are in parallel so as to send a current in the same direction through an external resistance of 20. Calculate p.d across Two identical coils each of 25 turns diameter 0.31 m are placed so that they are concentric and with their place perpendicular to each other. A current of 2 A flows through each coil. Calculate resultant field at an common center. 49. A circular coil of 10 turns and mean radius 0.1 m carries a current of 2 A. It is placed with its plane in the magnetic meridian find resultant field at a point on the axis distance 0.12 m from the center of the coil. Given B H = 4 x 10-5 T. 50. The magnetic flux densities at two points on the axis of a circular coil at distances of 5 cm and 20 cm from the centre are in the ratio 8 :1. Calculate the diameter of the coil. 51. The coil of a TG has a resistance of 9. It is in series with a battery of emf 10 V and internal resistance 1. If the deflection produced is 40 0, calculate the reduction factor of the TG. Calculate B H if the coil contains 5 turns of radius 0.1 m. 52. Three. 3 long straight and parallel wires X, Y, Z carry currents of 10 A and 30 A and 40 A respectively as shown in fig. Find net force per unit length on the wire X X distanced between X and Y is 0.5 m and Y that between Y and Z is 0.3 Z 53. A galvanometer has a resistance of 50 and it s scale has 20 divisions. A current of 1 A is required to produce a deflection of 1 divisions. How do you convert it into i) a direct reading milliammeter and ii) a direct reading voltmeter? 54. An alternating potential of 110 Volts and 50 Hz is connected in series with a resistance of 200 ohm, an inductance of 5 henry and a capacitance of 2 micro Farad. Calculate the impedance and the current in the circuit. 55. An arc lamp requires 20 A current at 120 V d.c. source. If this lamp has to be used on an a.c. source at 220 V, 56 Hz, find the value of inductance of an inductor that must be connected with the lamp in order to maintain the same current. 5

6 57. A tube marked 60 W 60 V is connected in series with a capacitor to a 220 V, 50 Hz ac supply. The bulb is found to operate under normal wattage. Calculate the value of the capacity. 58. An arc lamp requires a current of 10 A at 40 V to operate. It is connected to a 200 V, 50 Hz ac source. Calculate the inductance of the choke required to be connected in series with the lamp. 6

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