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tive, the, Section - B, Attempt any EIGHT questions of the following:, Q. 3. Draw a neat labelled diagram of Ferry's black body., Q. 4. Write a note on free expansion in thermodynamic process., Q. 5. What is magnetization? Write its unit and dimensions., Q. 6. State any two conditions for steady interference pattern., Q. 7. With the help of suitable diagram state the expression for Biot-Savart's law, [91], ual, in vector form., Q. 8. State Faraday's laws of electromagnetic induction., Q. 9. Explain why the total impedance of a circuit decreases when a capacitor is, iple, added in series with inductor and resistor., Q. 10. A motor cyclist (to be treated as a point mass) is to undertake horizontal, circles inside the cylindrical wall of a well of inner radius 4 m., The co-efficient of static friction between tyres and the wall is 0.2., Calculate the minimum speed and period necessary to perform this stunt., s is, tial, [Ans.: vmin = 14 m/s, T = 1.795 sec.], Q.11. Compare the amount of work done in blowing two soap bubbles of radii in, the ratio 4:5., [Ans.: W,:W,= 16:25], Q. 12. Find the distance between two successive antinodes in a stationary wave, on a string vibrating with frequency 32 Hz. [Speed of wave = 48 m/s], [Ans.: 0.75 m], Q. 13. The e.m.f. of a cell is balanced by a length of 320 cm of the potentiometer, wire. When a cell is shunted by a resistance of 50 2 the balancing length is, reduced by 20 cm. Find internal resistance of the cell. [Ans.:r= 3.333 Q], %3D, 2., the, 1., d is, t is, Q.14. The photoelectric work function for a metal is 5 eV. Calculate the threshold, frequency for the metal., [Ans.:Vo, %3D, = 1.207 × 105 Hz], Section C, Attempt any EIGHT questions of the following:, [24], [8], Q.15. With a neat, labelled schematic diagram, explain the experimental set-up, for photoelectric effect., Xis, Q.16. What is light emitting diode? Explain working of a LED., Q.17. Obtain an expression for equivalent capacity for combination of three, capacitors connected in series., Q. 18. Explain surface tension on the basis of molecular theory., Q.19. Derive an expression for period of a simple pendulum., Q.20. State Huygens' principle. Explain geometrical construction of a plane, ear, wavefront., nal, Q.21. Obtain the expression for Bohr magneton., 82, 82, and, 173, m. They, Q. 22. The wavelength of two sound waves in air are, 171, and, produce 9 beats per second. Calculate the velocity of sound in air., [Ans.: v = 369 m/s], EA, Q. 23. Acircular loop of radius 9.2 cm carries a current of 2.3 A. Obtain the magnitude, [Ans.: B = 1.571 x 10-5 T], cle., of magnetic field at the centre of loop., [0, HSC - Physics (3)