Download PTU B.Sc-Hons 2020 March 1st Sem 75634 Physics Question Paper

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B.Sc (Hons) Aircraft Maintenance (Sem.-1)
PHYSICS
Subject Code : BSCARM-103-18
M.Code : 75634

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INSTRUCTIONS TO CANDIDATES :

1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions.

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SECTION-A

1. Answer briefly :
   1. Define vector triple product.
   2. State Hooke’s law and its significance.
   3. What is Poisson’s ratio and what can be its maximum and minimum values?
   4. Give the meaning and equation of centre of mass.

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   5. What do you mean by geosynchronous orbits?
   6. What is the difference between inertial and gravitational mass?
   7. Define damped harmonic motion.
   8. Two photons approach each other, what is their relative velocity?
   9. What is the difference between linear momentum and angular momentum?

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   10. What is the rest mass of a body?

SECTION-B

2. Derive an expression for the time of oscillation of a torsion pendulum. How will you use it to determine the modulus of rigidity of a wire? [5]
3. Prove that a frame of reference moving with uniform translational acceleration with respect to an inertial frame is a non-inertial frame. [5]

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4. 1. Prove that the work done by a conservative force round a closed path is zero. [3]
   2. Show that in a central force field the angular momentum of a particle is conserved. [2]
5. Describe the principle of motion of a rocket. Explain that the final velocity of a multistage rocket is much greater than the final velocity of a single stage rocket of the same weight and fuel supply. [5]
6. Discuss length contraction and time dilation on the basis of Lorentz transformation. [5]

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SECTION-C

6. Describe the Searle’s method of measuring Young’s modulus of the material in the form of a wire. Derive the formula used.
7. Show that for a particle executing simple harmonic motion, the average value of kinetic and potential energy is the same and is equal to half the total energy.
8. 1. What is the principle of conservation of linear momentum? Show that the linear momentum of a system of particles remains constant in the absence of any external force acting on it.
   2. What do you mean by potential energy? Show that it is a function of position whose negative gradient gives the conservative force.

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NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any page of Answer Sheet will lead to UMC against the Student.