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BSc Sem I 2015 2016 2016 Phy Ll Add Question Paper - Mumbai University | munotes

Fybsc Sem I Phy Ll Add 2015.pdf
SEM I · 2015-2016 · 787 KB · 1 May 2025

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Questions asked in this paper

  • Figures to the right indicates full marks ;
the questions are compulsory
Figures to the right indicates full marks ;
ii) Use of Non-programmable calculator is allowed
Attempt the following:
source of constant emf is connected across a series combination of an inductor and a resistance
rive an expression for the current in the circuit at time t, after the circuit is switch on. (8)
Draw a parallel LCR circuit. Derive an expression for its resonant frequency.Why is it called a
Show that for a pure resistance in an ac circult, the current and voltage are always in phase. (7)
What is a transformer? What are step-up and step down transformer? Discuss theory of transformer
) In a series LCR circuit, R=40Q and C=1 Find the resonant frequency for the circuit
CA capacitor of anda resistor of 10 are connected in series with a 6 volt source. Calculate the
charge on the capacitor and current in the circuit after 0.1 (5)
Attempt the following: (20)
Discuss Thomson s atomic model briefly. What were its drawbacks? (8)
State Bohrs postulate and derive an expression for the energies allowed to the electron in hydrogen
) ho discovered X-rays and how? Write some important properties of X-rays. (7)
the principle of complemenarity of waves and particles. (7)
B) State ana prove De theorems OR
What are the possible a nsistor configurations for transistor
4, Attempt any three f e To ng
source as V=22 1000t is a $00 0 resistance. Calculate the rms
B) a parallel resonant Circuit, mH, and C= Calculate the frequency at Which
What is the ‘ongest wavelength of Lyman series (5)
D) Calculate the wavelength of H, line of series if they avele of the He line is 486 nm. (S)
E) A SO kV X-ray tube emits X-rays. If the shortest wavelength of the emitted X-rays IS 0.25 calculate
the Planck s constant. (S)
F) Ina common base configuration a=0.96. The voltage drop across the load resistance of 2K connected
in the collector circuit is 2,2 V. Find the base leakage current). (5)

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