PIEAS is one of the leading Engineering University in the Pakistan. Every student have desire to get admitted in PIEAS. The university provides courses in engineering, natural sciences and formal sciences mainly but also indulges in BS, MS, Mphil, PHD programs. Other than these the University also offers short courses to Engineers, Scientists and Other Professionals for their continuing professional development. The Institute has been ranked No. 1 for Engineering & Technology by the Higher Education Commission (HEC), Pakistan, in all the three rankings (2006, 2012, 2013). The university is equipped with an excellent infrastructure and a highly qualified faculty who help bring out the best in students and help the country progress. Entry test has a total of 100 MCQs from FSc pre-engineering or A Levels equivalent syllabus. There are 25 MCQs each of Physics, Chemistry, Biology and Maths.
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The material used in florescent screen of CRO is?
A phosphor, most generally, is a substance that exhibits the phenomenon of luminescence. Somewhat confusingly, this includes both phosphorescent materials, which show a slow decay in brightness (>1 ms), and fluorescent materials, where the emission decay takes place over tens of nanoseconds.
Heat & Thermodynamics
At triple point of water, the pressure of gas is 2680 Pa. By changing T the pressure changed to 4870 Pa. The value of T is?
- 496 K
- 438 K
- 438 F
p.V = n.R.T
Since volume V and mass hence number of moles is constant:
p/T = n.R/V = constant
=> p1/T1 = p2/T2
=> T2 = T1.p2/p1
T1 is the triple point temperature of water, i.e
T1 = 0.010C = 273.16 K
T2 = 273.16 K * 4870Pa/2680Pa = 496.38K
The energy obtained in a nuclear reaction is derived from:
- Mass defect and binding energy
- All of these
All of these
The sum of the individual masses of the parts of a nucleus is less than their mass when they are bound into the nucleus producing mass defect. The mass from the mass defect is converted into the energy that holds the nucleus together and is released in fission. Fusion also produces energy when individual nuclei are forced to combine (fusion) and form new elements in a process that produces energy.