# GIK Sample Physics Questions

Ghulam Ishaq Khan Institute of Engineering Sciences and Technology (GIKI) is a private research university located in Topi KPK. It was established in 1988. It is one of the leading engineering university of Pakistan. The aim of the university is to provide quality education to it’s students. Their fee structure is quite high due to the quality of education and facilities GIK provides. For the students who cannot afford the expenses GIK also have the facility of need based scholarship.  Candidates who want to secure admission in GIK should give their best.

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Topic:

Nuclear physics

Question:

The energy obtained in a nuclear reaction is derived from

Option:

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

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.

Topic:

Heat & Thermodynamics

Question:

In an adiabatic process, a gas expands against a piston. Which of the following statement is true?

Option:

• No work is done in the process
• Internal energy is constant
• Molecules linear velocity increases
• Temperature of the gas falls

Temperature of the gas falls

Explanation:

Only statement D is correct, an in a adiabatic process no exchange of heat takes place and work is done at the expense of internal energy. If work is done by the system on the surroundings the internal energy of the system will fall and so the temperature. The linear velocity of the molecules also decreases due to decrease in internal energy.

Topic:

Atomic Spectra

Question:

Population inversion is the phenomenon observed in?

Option:

• Lasers
• Balmer series
• Compton effect
• X-rays

Lasers

Explanation:

In physics, specifically statistical mechanics, a population inversion occurs when a system exists in a state with more members in an excited state than in lower energy states. The concept is of fundamental importance in laser science because the production of a population inversion is a necessary step in the workings of a standard laser.

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