Not yet checked 2 of 8 questions have not yet been compared with the official paper.
Q. 1
(a)Explain in detail the two postulates which make up the special theory of relativity. Furthermore, explain what is "time dilation" and "length contraction". [10]
(b)Mention in detail what is "Superconductivity". Also explain "Meissner effect" and applications of superconductivity also Differentiate between "Reflection" and "Refraction". [10]
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Q. 2
(a)Explain the hydrogen bonding amongst water and ice. Comment about the importance of hydrogen bonding in our ecosystem. Explain the importance of hydrogen bonding in textile materials. [10]
(b)Calculate the mole fraction of benzene (C 6 H 6 ) in solution containing 40% by mass, in carbon tetrachloride (CCl 4 ) [10]
Not yet checked
(20)
Q. 3
(a)Differentiate between mutual and self-inductance. Also explain different cases of magnetic hysteresis. Explain the phenomenon of total internal reflection and its applications. [10]
(b)Discuss about the principle, construction and components of such motors which can also be used as generators. [10]
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Q. 4
(a)Mention the key features of 2-stroke and 4-stroke diesel engine which differentiates both type of engines and list the advantages of latest type of Diesel engines which do not operate on Diesel cycle. [10]
(b)A two-cylinder, four-stroke petrol engine has a bore of 380 mm and a stroke of 585 mm. At 240 RPM the torque developed is 11.86 kN m. Calculate: the brake power the brake mean effective pressure [10]
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Q. 5
Explain the composition characteristics and uses of following types of ferrous and non-ferrous materials:
(i)Low-carbon steel [4]
(ii)Medium-carbon steel [4]
(iii)High-carbon steel [4]
(iv)White iron [4]
(v)High speed steel [4]
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Q. 6
(a)Write a note on low cost roads and low-cost housing techniques recommended in developing countries. [10]
(b)Describe various filtration techniques used for water treatment. [10]
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Q. 7
The hook in Fig. is subjected to two forces, F1 and F2. Determine the magnitude and direction of the resultant force. [figure]
Not yet checked
(20)
Q. 8
Write note on following processes with the help of labelled diagrams:
The 2020 PMS Punjab Principles of Engineering paper set by the PPSC. Question wording only; questions marked “Not yet checked” have not been compared with the official paper yet.
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