MCQs

Explanation
Sound travels as a longitudinal wave, where particles vibrate parallel to the direction of wave motion. In contrast, light is a transverse wave, with vibrations perpendicular to the direction of propagation.

Explanation
Mass is a measure of an object's inertia — its resistance to changes in motion. Unlike weight (which depends on gravity), mass is an intrinsic property and directly related to inertia.

Explanation
A stone thrown from a height follows a projectile motion, which traces a parabolic path under gravity. This occurs due to the combination of constant horizontal velocity and accelerated vertical motion .

Explanation
Tungsten is used in bulb filaments because it has a very high melting point (~3422°C). It can withstand high temperatures without melting, making it ideal for glowing filaments.

Explanation
Neutron is a neutral particle, meaning it has no electric charge . Because of this, it didn't respond to electric or magnetic fields , making its detection difficult and late compared to protons and electrons.

Explanation
The given sentence is in past perfect passive voice : "had been bribed." Active voice of past perfect : Subject + had + past participle, hence " They had bribed the officer ."

Explanation
Why has the mirror been broken by you? This is a present perfect interrogative sentence in passive voice. Structure : Why + has/have + object + been + past participle + by subject.

Explanation
The teacher said that two and two is four. Universal truths or facts remain unchanged in indirect speech. Since " Two and two is four " is a mathematical fact, the verb " is " stays the same.

Explanation
Tahreek-e-Niswan : Founded in 1979 by Sheema Kermani , a renowned Pakistani dancer, activist, and feminist. Focuses on women’s rights, gender equality, and cultural activism through theater and grassroots campaigns.

Explanation
Bait-ul-Mal: An Islamic welfare system established during the time of Prophet Muhammad (PBUH) and formalized by Caliph Umar (R.A). Sources of funds : Zakat, charity (Sadaqah), state revenue (Fay, Ghanimah). Used for : Poverty alleviation, orphans, debt relief, public infrastructure.

Explanation
Michael Phelps has won the most Olympic medals in history. He has won a total of 28 medals, 23 of which are gold , making him the most decorated Olympian of all time. Phelps is an American former competitive swimmer . ****

Explanation
Svedberg (Sv): A unit measuring the sedimentation coefficient (how fast particles settle in a centrifuge). Used in ultracentrifugation to study macromolecules (e.g., proteins, ribosomes). 1 Sv = 10⁻¹³ seconds.

Explanation
The Treaty of Westphalia, signed in 1648, marked the end of  two major conflicts : The  Thirty Years' War  ( 1618–1648 ) in the Holy Roman Empire, involved various  European powers, including Germany. The Eighty Years' War (1 568–1648 ) between Spain and the  Dutch Republic, resulted in Dutch independence from Spanish rule.

Explanation
The man who built the first Mechanical Calculator was Blaise Pascal . Pascal's calculator is a mechanical calculator invented by Blaise Pascal in the early 17th century. Mathematician Blaise Pascal was born on June 19, 1623 , in Clermont-Ferrand, France. In the 1640s he invented the Pascaline , an early calculator , and further validated Evangelista Torricelli's theory concerning the cause of barometrical variations. In 1642 , at the age of 18 , Pascal invented and build the first digital calculator as a means of helping his father perform tedious tax accounting. The device was called Pascal's calculator or the Pascaline or the Arithmetique .

Explanation
72 beats per minute is a good heart rate. Complete answer: The resting person usually has a pulse rate between 70 (beats per minute) and 80 (beats per minute). Your risk of dying from a heart attack is lower if your heart rate is below 80 beats per minute. A normal resting heart rate ranges from 60 to 100 beats per minute.

Explanation
Trees as Environmental Buffers : Climate Regulation : Absorb CO₂, release O₂, and moderate temperatures. Soil Protection : Prevent erosion and maintain soil health. Water Cycle : Help in groundwater recharge and reduce flooding.

Explanation
The main idea of the solar system was proposed by the Polish astronomer Nicolaus Copernicus (1473-1543). who said that "the Sun is the centre of the Universe " and made the planets move around it in perfect circles (in his book entitled, "On the Revolution of the Celestial Spheres", written in Latin and published in 1543)

Explanation
The Punjab School Education Department (SED) on December 7, 2022 inaugurated first transgender school in Lahore to educate and teach skills to transpersons.

Explanation
Tahreek-e-Niswan : Founded in 1979 by Sheema Kermani , a renowned Pakistani dancer, activist, and feminist. Focuses on women’s rights, gender equality, and cultural activism through theater and grassroots campaigns.

Explanation
Bait-ul-Mal: An Islamic welfare system established during the time of Prophet Muhammad (PBUH) and formalized by Caliph Umar (R.A). Sources of funds : Zakat, charity (Sadaqah), state revenue (Fay, Ghanimah). Used for : Poverty alleviation, orphans, debt relief, public infrastructure.

Explanation
Michael Phelps has won the most Olympic medals in history. He has won a total of 28 medals, 23 of which are gold , making him the most decorated Olympian of all time. Phelps is an American former competitive swimmer . ****

Explanation
Svedberg (Sv): A unit measuring the sedimentation coefficient (how fast particles settle in a centrifuge). Used in ultracentrifugation to study macromolecules (e.g., proteins, ribosomes). 1 Sv = 10⁻¹³ seconds.

Explanation
The Treaty of Westphalia, signed in 1648, marked the end of  two major conflicts : The  Thirty Years' War  ( 1618–1648 ) in the Holy Roman Empire, involved various  European powers, including Germany. The Eighty Years' War (1 568–1648 ) between Spain and the  Dutch Republic, resulted in Dutch independence from Spanish rule.

Explanation
The man who built the first Mechanical Calculator was Blaise Pascal . Pascal's calculator is a mechanical calculator invented by Blaise Pascal in the early 17th century. Mathematician Blaise Pascal was born on June 19, 1623 , in Clermont-Ferrand, France. In the 1640s he invented the Pascaline , an early calculator , and further validated Evangelista Torricelli's theory concerning the cause of barometrical variations. In 1642 , at the age of 18 , Pascal invented and build the first digital calculator as a means of helping his father perform tedious tax accounting. The device was called Pascal's calculator or the Pascaline or the Arithmetique .

Explanation
72 beats per minute is a good heart rate. Complete answer: The resting person usually has a pulse rate between 70 (beats per minute) and 80 (beats per minute). Your risk of dying from a heart attack is lower if your heart rate is below 80 beats per minute. A normal resting heart rate ranges from 60 to 100 beats per minute.

Explanation
Trees as Environmental Buffers : Climate Regulation : Absorb CO₂, release O₂, and moderate temperatures. Soil Protection : Prevent erosion and maintain soil health. Water Cycle : Help in groundwater recharge and reduce flooding.

Explanation
The main idea of the solar system was proposed by the Polish astronomer Nicolaus Copernicus (1473-1543). who said that "the Sun is the centre of the Universe " and made the planets move around it in perfect circles (in his book entitled, "On the Revolution of the Celestial Spheres", written in Latin and published in 1543)

Explanation
The Punjab School Education Department (SED) on December 7, 2022 inaugurated first transgender school in Lahore to educate and teach skills to transpersons.