# Physics-1 sample paper 1st semester

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Sample Question Paper

Physics-1 sample paper 1st semester

Physics-1 (HY 101E)

Time Allowed: 3 Hours

Maximum Marks: 100

Instructions: The question paper consists of 8 questions. The students are required to answer any 5, taking at least one question from each unit. Each question consists of 20 marks.

Unit One  Physics-1 sample paper 1st semester

1.

a) Explain the construction set up and the principle for the formation of Newton’s Rings. Also what is the difference observed by using white light, in place of monochromatic light.                            (10)

b) Explain the concept of Interference of Light. If a thin plate is introduced in the path of beam of light for a Michelson Interferometer, it is observed that 35 bands have crossed the line of observation. Determine the thickness of the plate, if wavelength of light used is 5890 A.            (10)

2.

a) Explain with the help of a diagram, the principle, construction and action of a Nicol’s Prism.  (10)

b) Describe the functioning of a Quater Wave Plate and Half Wave Plate in polarization.           (10)

Unit 2

3.

a) Explain the concepts of Spontaneous and Simulated emission.                                               (5)

b) What are the characteristics of a Laser Light.                                                                          (5)

c) Explain the construction and working principle of a Helium-Neon Laser using a diagram.        (10)

4.

a) What are optical fiber. Explain the difference between various modes of optical fiber.           (12)

b) Write short note on following:

•      Numerical Aperture                                                                                                            (4)
•       Acceptance Angle                                                                                                             (4)

Unit 3

5.  State and prove Gauss’s law in Dielectrics.                                                                           (20)

6.

a) What is Poynting’s Vector. Explain in detail with the help of a derived equation and corresponding applications.                                                                                                       (12)

b)    Explain the behavior of dielectrics when exposed to an AC field.                                        (8)

Unit 4

7.

a) What do you understand by Lorentz Transformations? What is the principle behind the change observed due to Lorentz Transformation.                                                                                 (15)

b) Write a short note on Mass Energy Equivalence.                                                                  (5)

8. Write short notes on the following:

•    Scintillation Effect                                                                                                                   (5)
•    G.M. Counter                                                                                                                         (5)
•    Reactor Criticality                                                                                                                   (5)
•    Cloud Chamber                                                                                                                      (5)

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