BSER -PHYSICS- SENIOR SECONDARY EXAMINATION, 2016 

1. State any two reasons for necessity of modulation.
2. Draw a curve for showing variation in alternating current with frequency in LCR resonant circuit. Hence obtain an expression of bandwidth.
3. Draw the circuit diagram of npn transistor in common emitter configuration. Hence describe the working method to obtain output characteristic curve.
4. An object of size 3 cm is placed at 30 cm in front of a concave mirror of radius of curvature 40 cm. Find the distance and size of image from the mirror and describe the nature of the image.
5. In Young’s double-slit experiment, the slots are separated by 0·28 mm and the screen is placed 1·4 m away. If the distance between the central bright fringe and the fourth bright fringe is 1·2 cm, determine the wavelength of light used in the experiment.
6. Define electric flux. Apply Gauss’ law to obtain an expression for the electric field intensity at a point due to an infinitely long uniformly charged straight wire. Draw the necessary diagram.
7. Derive an expression for the force per unit length acting on the two straight parallel current carrying conductors. In which condition will this force be attractive and repulsive ? Define the standard unit of current.
8. Draw a graph to show the relative intensity distribution for a single slit diffraction pattern. Obtain the expression for the width of central maxima. If slit width is doubled then what is the effect on width of central maxima ?
9. Draw a labelled ray diagram of a refractive telescope. Deduce an expression of magnifying power of it. Write two main limitations of a refracting type telescope over a reflecting type telescope.
10. An electron is revolving with speed v in a circular orbit of radius r. Obtain the expression of gyromagnetic ratio. What is a Bohr magneton ? Write its value.
11. Define electric capacity. Derive an expression for the capacitance of a parallel plate capacitor in which a dielectric medium of dielectric constant K fills the space between the plates. Draw the necessary diagram
12. Two point charges C 5 10−8 × and C 3 10−8 − × are located 16 cm apart. At what point on the line joining these charges the electric potential will be zero ?
13. Two cells of emfs E1 and E2 are connected in series. Their internal resistances are 1 r and 2r respectively. Compute the equivalent emf and equivalent internal resistance.
14. Write the names of any two organic compound semiconductors.
15. Write one example of point to point communication.
16. Sketch a block diagram of a generalised communication system.

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