Name of the Organisation : Institute Of Aeronautical Engineering
Exam : B.Tech Semester Examinations
Subject : Applied Physics
Semester : 2
Document Type : Previous Question Paper
Website : https://www.iare.ac.in
B.Tech Semester – 2 Applied Physics Question Papers
IARE B.Tech Applied Physics Previous Question Paper Semester 2 for the year 2021.
Related / Similar Question Paper : iare.ac.in B.Tech Engineering Physics Previous Question Paper
B.Tech Semester – 2 Applied Physics Questions
MODULE – I
1. (a) Describe an experimental technique which is direct proof that particles like electrons are associated waves when they are in motion. [7M]
(b) Find the De Broglie wavelength of an electron whose speed is 2.0x108m/sec. [7M]
MODULE – II
2. (a) Discuss the motion of an electron in a periodic potential. Explain how the above theory leads to the concept of band structure of solids. [7M]
(b) The intrinsic carrier density at room temperature in Ge is 2.37×1019 /m3. If the electron and hole mobilities are 0.38 and 0.18 m2/V sec respectively. Calculate the resistivity. [7M]
MODULE – III
3. (a) Explain in detail direct and indirect band gap semiconductors with energy band diagrams and examples. [7M]
(b) Calculate the forward bias current of a Si diode when forward bias voltage of 0.4V is applied, the reverse saturation current is 1.17×10−9A and the thermal voltage is 25.2mV. [7M]
4. (a) Explain the construction and working of solar cell with suitable diagrams. Draw the V-I characteristics of solar cell. [7M]
(b) Consider a silicon diode with η=1.2. Find the change in voltage if the current changes from 0.1mA to 10mA. [7M]
MODULE – IV
5. (a) Give a schematic sketch of different types of polarization and explain in detail. [7M]
(b) Consider a parallel plate capacitor having an area 6.45×10−4 m2 and a plate separation of 2×10−3 m across which a potential of 10 V is applied. If a material having dielectric constant of 6.0 is positioned with in the region between the plates. Compute i) The capacitance ii) Magnitude of the charge stored on each plate. [7M]
6. (a) List the differences between diamagnetic, paramagnetic, and ferromagnetic materials. [7M]
(b) The magnetic flux density within a bar of some material is 0.63 Tesla at an H field of 5×105 A/m. Compute i) The magnetic susceptibility ii) Magnetic permeability. [7M]
MODULE – V
7. (a) Explain the principle of operation of optical fiber. Draw a schematic layout of a step index optical fiber. [7M]
(b) A step index fiber has a core of refractive index 1.5. If the numerical aperture of the fiber is 0.26, calculate the refractive index of the cladding material. [7M]
8. (a) Explain the construction and working of a ruby laser system with suitable energy level diagram. [7M]
(b) In a material, transition occurs between a metastable state and an energy level of 0.25 eV. The wavelength of the radiation emitted is 1100nm. Calculate the energy of the metastable state. [7M]
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