| Vipin was going from his village to town area market on his bike. On the way, he saw a weak old man, who was also walking in same direction. Vipin offered him lift and dropped him, where he told him. The old man gave him blessings. |
| (i) What values are shown by Vipin? |
| (ii) Can you relate the given incident with the process of modulation? |
| A galvanometer having 30 division scale and \[100\,\Omega \] resistance is connected in series to the battery of emf 3 V through a resistance of \[200\,\Omega ,\] shows full scale deflection. Find the figure of merit of the galvanometer in microampere. |
| Or |
| A circular segment of radius 10 cm, subtends an angle of \[60{}^\circ \] at its centre. A current of 9 A is flowing through it. Find the magnitude and direction of the magnetic field produced at the centre. |
| In a classroom discussion, students had to discuss about the direction indicators that were used in shipping corporation, long time ago. |
| How they decided that in which direction the ship has to be moved in the long distance journey. No one had deep knowledge in the classroom except |
| Shanu. He wanted to explain about the direction indicators used by the ship before several years. |
| But, the noise was interrupting him in explaining the things. |
| (i) What should be done by Shanu, so that he can explain the things? |
| (ii) What is magnetic compass and how it is used? |
| An Indian railways high ranking official went to Japan on an official tour regarding the bullet train project between to Metro Cities in India. Where his Japanese's counterpart Mr. Hanjo-Reanjo enterpetated maglev train. |
| The maglev trains work on the principle of Meissner's effect. |
| (i) Do you know this effect, explain it? |
| (ii) What values did Mr. Reanjo show to Indian official? |
| The resistivity of pure silicon of \[3000\,\Omega \,m.\] and the electron and hole mobilities are |
| \[0.12\,{{m}^{2}}{{V}^{-1}}{{s}^{-1}}\] and 0\[0.045\,{{m}^{2}}{{V}^{-1}}{{s}^{-1}}\] respectively, determine |
| (i) the resistivity of a specimen of the material when \[{{10}^{19}}\] atoms of phosphorous are added per \[{{m}^{3}}.\] |
| (ii) the resistivity of the specimen if further \[2\times {{10}^{19}}\] boron atoms perm3 are also added. |
| Shreya's friend Ravi fell from a stool of height 2m. He got injured his leg. Shreya brought him to hospital. He was examined by the doctor, who advised for an X-ray test, which confirmed a hairline fracture. |
| (i) How are X-rays produced? |
| (ii) What kind of girl is Shreya? |
| (iii) Arrange X-rays, ultraviolet rays and visible light according to their energy. |
| In Young's double slit experiment, the two slits 0.15 mm apart are illuminated by monochromatic light of wavelength 450 nm. |
| The screen is 1m away from the slits. |
| (i) Find the distance of the second |
| (a) bright fringe and |
| (b) dark fringe from the central maximum. |
| (ii) How will the fringe pattern change, if the screen is moved away from the slits? |
| Draw ray diagram and show how a right angled isosceles prism can be used |
| (i) to deviate a ray by \[90{}^\circ \] |
| (ii) to deviate a ray by \[180{}^\circ \] |
| (iii) to produce an inverted image without any deviation? |
| (i) E with R |
| (ii) terminal potential difference of the cell if with R. |
| Or |
| Distance between the plates of a capacitor of capacitance C is d. A very thin metal sheet is placed as shown in the figure. Calculate the new capacitance. |
Plate capacitor | A daily wage worker, Narendra got affected by Cancer. On knowing about it all his co-workers started avoiding him, fearing that, it was contagious. Mr. Narendra felt depressed. |
| Mr. Amit, a close friend immediately took him to a radiologist, who examined him and said, it was initial stage of Cancer and it can be easily cured and he also certified that it is not a communicable disease. (i) What moral values did Mr. Amit exhibit? |
| (ii) What do you understand by radioactivity? How the half-life is related to the disintegration constant? |
| (iii) How is average life of a radioactive sample related to its half-life? |
| An alternating emf \[E={{E}_{0}}\sin \omega t\] is applied as an input in a purely resistive circuit of resistance R. |
| (i) What is the current in the circuit? |
| (ii) What is the phase difference between the emf and the current? |
| (iii) Draw the graphical representation of the emf and the current. |
| (iv) What is the average power dissipated? |
| (v) Show the emf and current in vector representation. |
| Or |
| What is time constant? A parallel plate capacitor of capacitance C with plates of unit area and separation d is filled with a liquid of dielectric constant K = 2. The level of liquid is \[\frac{d}{3}\] initially. Suppose the liquid level decreases at a constant speed v. What will be the time constant as a function of time t? |
 |
| (i) Derive the lens formula \[\frac{1}{f}=\frac{1}{v}-\frac{1}{u}\] for a concave lens, using the necessary ray diagram. |
| (ii) The image of a small electric bulb fixed on the wall of a room is to be obtained on the opposite wall 4 m away by means of a large convex lens. What is the maximum possible focal length of the lens required for this purpose? |
| Or |
| Figure below shows an equiconvex lens (of refractive index 1.50) in contact with a liquid layer on top of a plane mirror. A small needle with its tip on the principal axis is moved along the axis until its inverted image is found at the position of the needle. The distance of the needle from the lens is measured to be 50 cm. The liquid is removed and the experiment is repeated. The new distance is measured to be 30.0 cm. What is the refractive index of the liquid? |
| Define resistivity of a conductor. How does the resistivity of a metallic conductor changes with temperature? Draw approximate graph of resistivity plotted against temperature for |
| (i) metal |
| (ii) an alloy and |
| (iii) a semiconductor |
| Or |
| (i) Write the principle of a potentiometer. How can internal resistance of a cell be found with it? |
| (ii) (a) Why do we prefer a potentiometer with a longer bridge wire? |
| (b) Why is the use of potentiometer preferred over that of voltmeter? |
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