# GIKI SAMPLE PHYSICS QUESTIONS

Ghulam Ishaq Khan Institute of Information Technology (GIKI) is ranked among top engineering universities of Pakistan and also known as worldwide due to their quality of education. GIKI was established in 1988 by former President of Pakistan Ghulam Ishaq Khan. Their main motive is to provide quality education and lift youth of Pakistan by providing them carrier opportunities. Currently GIKI has six different departments focusing on science and engineering. Same like other universities their eligibility criteria is not very high and you only need 60% marks in FSc to be eligible for any program in GIKI. Due to their high standards their fee structure is also very high and not every candidate can afford it, so keeping that in mind they also provide scholarships to needy students.

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Topic:

Electromagnetism

Question:

The material used in florescent screen of CRO is?

Options:

• Magnesium
• Glass
• Phosphor
• Sodium

Correct Option:

Phosphor

Explanation:

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.

Topic:

Heat & Thermodynamics

Question:

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?

Options:

1. 496 K
2. 438 K
3. 0
4. 438 F

Correct Option:

496 K

Explanation:

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

Hence:

T2 = 273.16 K * 4870Pa/2680Pa = 496.38K

Topic:

Nuclear physics

Question:

The energy obtained in a nuclear reaction is derived from:

Options:

• Mass defect and binding energy
• Fission
• Fusion
• All of these

Correct Option:

All of these

Explanation:

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.

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