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Sourav Ghosh
Burdwan University (BU), Rajbati, Bardhaman
M.Tech Microwaves

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fiziks Institute for NET/JRF, GATE, IIT-JAM, JEST, TIFR and GRE in PHYSICAL SCIENCES JEST PHYSICS-2014 PART-A: 3 Mark Questions Q1. A dynamical system with two generalized coordinates q1 and q2 has Lagrangian L q 12 q 22 . If p1 and p2 are the corresponding generalized momenta, the Hamiltonian is given by (a) p12 p 22 / 4 Q2. (b) q 12 q 22 / 4 (c) p12 p 22 / 2 (d) p1 q 1 p 2 q 2 / 4 In a certain inertial frame two light pulses are emitted, a distance 5 km apart and separated by 5 s . An observer who is traveling, parallel to the line joining the points where the pulses are emitted, at a velocity V with respect to this frame notes that the pulses are simultaneous. Therefore V is (a) 0.7 c Q3. (b) 0.8 c (c) 0.3 c (d) 0.9 c Suppose a spin 1 / 2 particle is in the state 1 1 i 6 2 If S x ( x component of the spin angular momentum operator) is measured what is the probability of getting / 2 ? (a) 1 / 3 Q4. (b) 2 / 3 (c) 5 / 6 (d) 1 / 6 For an optical fiber with core and cladding index of n1 1.45 and n2 1.44 , respectively, what is the approximate cut-off angle of incidence? Cut-off angle of incidence is defined as the incidence angle below which light will be guided. (a) 7 o (b) 22o (c) 5 o Head office fiziks, H.No. 23, G.F, Jia Sarai, Near IIT, Hauz Khas, New Delhi-16 Phone: 011-26865455/+91-9871145498 Website: www.physicsbyfiziks.com Email: fiziks.physics@gmail.com (d) 0 o Branch office Anand Institute of Mathematics, 28-B/6, Jia Sarai, Near IIT Hauz Khas, New Delhi-16 1

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