Engineering Physics SPPU Endsem Question Paper Nov 2024 (paper 2)
All 11 questions from this SPPU endsem paper, as printed. Read them here or open the PDF.
- Pattern
- 2024 pattern
- Exam
- Endsem
- Session
- Nov 2024
- Max. marks
- 70
- Time
- 2½ Hours
- Semester
- I
- Paper code
- [6351]-112
Printed for: F.E.
Instructions to the candidates
- Question No. 1 is compulsory.
- Questions No. 2 to No. 11 carry equal marks.
- Figures to the right indicate full marks.
- Assume suitable data, if necessary.
- Use of an electronic calculator is allowed. Physical Constants:
- Mass of electron, m e = 9.1 × 10 –31 kg
- Charge on electron, e = 1.6 × 10 –1 9 C
- Planck’s constant, h = 6.63 × 10 –34 J-sec
Questions
Q1
Multiple choice questions. [10×1=10]
- a)
The process of raising the atoms from a lower energy state to a higher one to create population inversion is called: i) Pumping ii) Stimulated emission iii) Spontaneous emission iv) Absorption
- b)
The main principle of optical fiber is: i) Total internal reflection ii) Total internal refraction iii) Total internal dispersion iv) None of the above
- c)
The full form of STM is: i) Scientific technical microscope ii) Scanning tunneling microscope iii) Super tensile microscope iv) None of the above P.T.O. SPPU QUESTION PAPER www.mysppu.in Page 1 MySPPU · Engineering Physics Page 1 of 4 2
- d)
The wavelength of a matter wave is ____ to the velocity of the particle: i) Equal ii) Inversely proportional iii) Directly proportional iv) Independent
- e)
This part has equations that don’t show as text. Open the PDF to read it.
- f)
In a positive crystal, the velocity of the O-ray is: i) half of velocity of the E-ray ii) Less than the velocity of the E-ray iii) Greater than the velocity of the E-ray iv) None of the above
- g)
Pure semiconductors are known as: i) Compound ii) Extrinsic iii) Doped iv) Intrinsic
- h)
Hall Effect is true for: i) Metals only ii) Semiconductors only iii) N-type semiconductors only iv) Both metals and semiconductors i) Superconductors are perfectly: i) Paramagnetic ii) Ferromagnetic iii) Diamagnetic iv) All of the above j) Nanostructures have sizes between: i) 1-100 Å ii) 1 - 100 nm iii) 100 - l000nm iv) None of the above SPPU QUESTION PAPER www.mysppu.in Page 2 MySPPU · Engineering Physics Page 2 of 4 3
Q2
- a)[6]
With a neat labelled diagram, explain the construction, and working of a CO2 laser.
- b)[3]
If an optical fiber has a core refractive index of 1.55 and a cladding refractive index of 1.46, calculate the Numerical Aperture of the fiber.
- c)[3]
Define the following terms: i) Metastable state ii) Population inversion iii) Stimulated emission
OR- a)
Q3
- a)[6]
What is attenuation in optical fibers? Discuss in brief the various internal and external factors responsible for attenuation.
- b)[3]
What is a LASER? State important characteristics of a laser.
- c)[3]
Differentiate between step index and graded index fibers. (Any three points)
- a)
Q4
- a)[6]
Derive the Schrödinger’s Time-Independent Wave Equation.
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- b)[3]
For an electron accelerated by a potential difference V, derive the expression for its de Broglie wavelength.
- c)[3]
Find the lowest energy of an electron confined to a box of length 1 Å.
OR- a)
Q5
- a)[6]
With a neat labelled diagram, explain the principle, construction, and working of a Scanning Tunnelling Microscope (STM).
- b)[3]
State the properties of matter waves (Any three).
- c)[3]
If the de Broglie wavelength is 0.72 AU, then find the momentum of the particle.
- a)
Q6
- a)[6]
State the phenomenon of double refraction. Hence, explain Huygens’s wave theory of double refraction.
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- b)[3]
- c)[3]
How should the Polarizer and Analyzer be oriented to reduce the intensity of the beam to ½ of its original intensity. OR SPPU QUESTION PAPER www.mysppu.in Page 3 MySPPU · Engineering Physics Page 3 of 4 4
- a)
Q7
- a)[6]
Derive the conditions for brightness and darkness for the thin parallel film of thickness t and refractive index .
- b)[3]
State and explain Malus’s Law.
- c)[3]
A beam of monochromatic light of wavelength 5.82 × 10 –7 m falls normally on a glass wedge of angle 20 sec. If the refractive index (RI) of glass is 1.5, find the bandwidth.
- a)
Q8
- a)[6]
Explain the classification of solids into conductors, semiconductors, and insulators on the basis of band theory.
- b)[3]
State the any three properties of ultrasonic waves.
- c)[3]
An ultrasonic pulse is sent through a block of copper. The echo pulse is recorded after 4 s. If the velocity of ultrasonic waves in copper is 5000 m/s, calculate the thickness of the copper block.
OR- a)
Q9
- a)[6]
With a neat labelled diagram, explain the principle, construction, and working of a Piezoelectric Oscillator.
- b)[3]
Write the formula for the Fermi-Dirac probability distribution function, specifying the meaning of each symbol.
- c)[3]
For a P-N junction diode, draw an energy band diagram showing the position of the Fermi level in: Forward bias mode
- a)
Q10
ORQ11
- a)[6]
What are the types of superconductors? Distinguish between them.
- b)[6]
What is quantum confinement? How does it affect the properties of nanoparticles? Explain the ball milling method for the synthesis of nanoparticles. eeee SPPU QUESTION PAPER www.mysppu.in Page 4 MySPPU · Engineering Physics Page 4 of 4
- a)