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The MCQs below are drawn from the Principle of Engineering subject category.
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271
What is the fundamental operating principle of a telephone receiver?
A telephone receiver converts electrical signals back into sound. It contains an electromagnet that fluctuates in strength based on the incoming electrical current. These magnetic variations cause a thin metal diaphragm to vibrate, which in turn creates sound waves that mimic the original speech patterns.
272
What physical principle explains why liquid rises into a syringe when the piston is retracted?
When the piston of a syringe is pulled upward, it increases the volume inside the barrel, which creates a partial vacuum or a region of lower pressure. Because the external atmospheric pressure is greater than the pressure inside the syringe, it pushes the liquid up through the needle and into the barrel to equalize the pressure difference.
273
Why are rooftops frequently blown off during high-velocity wind storms?
This phenomenon is explained by Bernoulli's principle, which states that as the speed of a fluid (air) increases, its pressure decreases. High-velocity wind blowing over a roof creates a region of low pressure above it. Since the air pressure inside the building remains higher, this pressure difference creates an upward force that can lift the roof.
274
Given that ice is less dense than water, what fraction of a giant iceberg typically remains above the water surface?
Because the density of ice is approximately 90% of the density of liquid seawater, Archimedes' principle dictates that about 90% of the iceberg's volume must be submerged to displace an equal weight of water. Consequently, only about 10%, or one-tenth, of the total volume of an iceberg is visible above the surface, while the vast majority remains hidden underwater.
275
Which of the following regional organizations is primarily structured around the principle of intergovernmental cooperation in South Asia?
The South Asian Association for Regional Cooperation (SAARC) serves as the primary regional geopolitical framework for fostering economic and social integration among South Asian states.
Consider the following statements about the security breach investigation:
1. The investigation was prompted by reports of leaks regarding the use of military helicopters for personal travel.
2. The flight in question was successfully completed despite security concerns.
3. The Secret Service maintains that operational security is a non-negotiable principle for protectees.
Which of the statements given above is/are correct?
Statement 1 and 3 are factually accurate based on the report. Statement 2 is incorrect because the flight was cancelled due to thunderstorms, not successfully completed. [Source: https://www.dawn.com/news/2017994/vances-agent-faces-probe-after-leak-about-chopper-trip-for-son, 24 Jul 2026]
277
Which constitutional principle serves as the primary mechanism to prevent the executive branch from encroaching upon the adjudicative functions of the judiciary?
The doctrine of Separation of Powers establishes the institutional framework that mandates the independence of the judiciary from executive interference, ensuring a system of checks and balances.
The ISPR statement explicitly highlighted that peace and stability in the region are linked to collective restraint, responsibility, and respect for sovereignty. Unilateral intervention and expansionism are contrary to the stated policy of restraint. [Source: https://www.dawn.com/news/1997771/regional-peace-stability-linked-to-collective-restraint-respect-for-sovereignty-armys-top-brass, 05 May 2026]
279
The exercise of executive authority by the President of Pakistan is primarily constrained by which constitutional principle?
The constitutional framework of Pakistan is predicated on the Separation of Powers, which delineates the boundaries of executive, legislative, and judicial authority to prevent the concentration of power.
Pakistan advocates for peace, dialogue, and the cessation of hostilities. Unilateral military support for offensive operations contradicts the stated policy of facilitating a peaceful, negotiated resolution. [Source: https://www.dawn.com/news/1981279/in-restricted-meeting-with-saudi-crown-prince-pm-shehbaz-assures-him-of-pakistans-full-solidarity-support, 12 Mar 2026]
