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SPSC · CCE Sindh 2021

Physics

100 marks · 3 hours · 7 questions · official PDF, 1 page
This paper Physics · all yearsQ. 1 · What are the mass and…Q. 2 · Explain the difference between Longitudinal…Q. 4 · What is the center of…Q. 5 · Why does the normal Zeeman…Q. 6 · Discuss the deBroglie hypothesis, and…Q. 7 · Describe and compare the operations…Q. 8 · How the paramagnets, diamagnets and…With this paperOfficial PDF1 pp
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Not yet checked 5 of 7 questions have not yet been compared with the official paper.

Q. 1
  1. (a)What are the mass and weight of: a 1420 lb1420\text{ lb} snow mobile a 412 kg412\text{ kg} heat pump? [10]
  2. (b)What is the net force acting on a 3900 lb3900\text{ lb} automobile accelerating at 13 ft/s213\text{ ft/s}^2 ? [10]
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Q. 2
  1. (a)Explain the difference between Longitudinal and Transverse waves also derive the relation for the different modes of the standing waves. [10]
  2. (b)Standing wave is established in a 120 cm120\text{ cm} long string fixed at both ends. The string vibrates in four segments when driven at 120 Hz120\text{ Hz} : determine the wavelength what is the fundamental frequency [10]
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Q. 4
  1. (a)What is the center of mass and center of gravity? How to calculate the center of mass of the different shapes? Also discuss the conservation of momentum in the system of particles. [10]
  2. (b)Consider a rocket at rest in empty space. What must be its mass ratio (Ratio of initial to final mass) in order that after firing its engine the rockets speed is: Equal to the exhaust speed Equal to twice the exhaust speed [10]
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Q. 5
  1. (a)Why does the normal Zeeman effect occurs only in the atoms with an even number of electrons. [10]
  2. (b)Calculate the Zeeman splitting for the 3S1/23S_{1/2} and 2P1/22P_{1/2} states of sodium in the external magnetic field of 2 T2\text{ T} . [10]
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Q. 6
  1. (a)Discuss the deBroglie hypothesis, and also explain the Davison-Germer experiment. [10]
  2. (b)Explain the position-momentum and time-energy uncertainty principle. [10]
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Q. 7
  1. (a)Describe and compare the operations of a centre-tapped full wave rectifier and bridge rectifier. [10]
  2. (b)Define ripple voltage and ripple factor. Calculate the ripple factor if Vr(pp)=1.13 VV_{r(pp)} = 1.13\text{ V} and VDC=14.3 VV_{DC} = 14.3\text{ V} . [10]
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Q. 8
  1. (a)How the paramagnets, diamagnets and ferromagnets, are classified? Also discuss Ampere's Law in the magnetized materials. [10]
  2. (b)A current II flows down a long straight wire of radius RR . If the wire is made of linear material with susceptibility and the current is distributed uniformly, what is the magnetic field at a distance rr from the centre? Find all the bound currents. What is the net current flowing down the wire? [10]
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About this paper

The 2021 CCE Sindh Physics paper set by the Sindh Public Service Commission. Question wording only; questions marked “Not yet checked” have not been compared with the official paper yet. Open the official paper beside the questions to check any of them.

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