Everyday Science MCQs with Answers for CSS, PMS, PPSC, and FPSC exams.
Includes solved CSS General Science and Ability Past Papers, ideal for CSS MPT Test preparation by FPSC.
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Correct answer: 95%. Rectified spirit contains about 95% ethyl alcohol.
Background: It is made by distillation of fermented liquid.
Did you know? It cannot be made purer than about 95.6% by ordinary distillation.
Memory trick: Rectified spirit = 95%.
Correct answer: Mercury. Mercury is the only metal that is liquid at normal room temperature.
Background: Mercury freezes at about −39 °C.
Did you know? It is used in some thermometers.
Memory trick: Mercury = liquid metal.
Correct answer: 60%. An adult human body is about 60% water.
Background: The percentage is higher in babies and lower in older people.
Did you know? The brain and heart are about 73% water.
Memory trick: Body ≈ 60% water.
Correct answer: William Harvey. William Harvey described the circulation of blood in 1628.
Background: Harvey explained that the heart pumps blood around the body in a circuit.
Did you know? His book is “De Motu Cordis” (On the Motion of the Heart).
Memory trick: Harvey = heart circulation.
Correct answer: 20 Hz – 20 kHz. A normal human ear can hear sounds from about 20 Hz to 20,000 Hz (20 kHz).
Background: Sounds below 20 Hz are infrasound, and above 20 kHz are ultrasound.
Did you know? Dogs can hear much higher sounds than humans.
Memory trick: 20 to 20k.
Correct answer: Lion. The lion is a member of the cat family and lives in groups called prides.
Background: Lionesses do most of the hunting.
Did you know? A pride can include up to about 30 lions.
Memory trick: Lion = pride.
Correct answer: Silicon. Most solar panels are made of silicon, which converts sunlight into electricity.
Background: Silicon is a semiconductor.
Did you know? Solar cells work through the photovoltaic effect.
Memory trick: Solar = silicon.
Correct answer: Jaime Ferrán. Jaime Ferrán, a Spanish physician, developed the first cholera vaccine in 1885.
Background: It was the first vaccine against a bacterial disease in humans.
Did you know? Cholera spreads through contaminated water.
Memory trick: Cholera vaccine = Ferrán.
Correct answer: 25–45%. A diesel engine converts about 25–45% of fuel energy into useful work.
Background: Diesel engines are generally more efficient than petrol engines.
Did you know? Large diesel engines are the more efficient ones.
Memory trick: Diesel: 25–45%.
Correct answer: 746 Watts. 1 horsepower is equal to about 746 watts.
Background: Horsepower was introduced by James Watt to compare engines with horses.
Did you know? The unit of power in the SI system is the watt.
Memory trick: 1 HP = 746 W.
Correct answer: All nucleated cells. Class I HLA (MHC-I) molecules are found on almost all cells that have a nucleus.
Background: HLA stands for Human Leukocyte Antigen.
Did you know? They help the immune system recognise infected cells.
Memory trick: Class I = all nucleated cells.
Correct answer: Prenatal Scanning. Ultrasound is widely used for prenatal scanning (checking an unborn baby).
Background: Ultrasound waves have frequencies above 20,000 Hz.
Did you know? Bats and dolphins use ultrasound to find objects.
Memory trick: Ultrasound scan = baby scan.
Correct answer: 4.5 billion years. The Earth is about 4.5 billion years old.
Background: Scientists measure the age by dating very old rocks and meteorites.
Did you know? The universe is about 13.8 billion years old.
Memory trick: Earth ≈ 4.5 billion years.
Correct answer: Cheetah. The cheetah is the fastest land animal, reaching about 100 km/h in short bursts.
Background: It can accelerate from 0 to 100 km/h in about three seconds.
Did you know? The cheetah can keep this speed for only a short distance.
Memory trick: Cheetah = fastest on land.
Correct answer: Zero. At the Earth’s centre the gravitational pulls from all sides cancel out, so the weight is zero.
Background: Weight is the force of gravity on an object.
Did you know? Mass stays the same, but weight becomes zero.
Memory trick: Centre of Earth = zero weight.
Correct answer: Water Softening. Water softening removes calcium and magnesium ions (the cause of hardness) from water.
Background: A common method is ion exchange.
Did you know? Hard water does not form lather easily with soap.
Memory trick: Hard water → soften.
Correct answer: EEG. An EEG (electroencephalogram) records the brain’s electrical activity.
Background: Electrodes are placed on the scalp.
Did you know? EEG is used to diagnose epilepsy.
Memory trick: E for Encephalon (brain).
Correct answer: Vehicular and industrial emissions. Emissions from vehicles and industry are the main year-round cause of smog in Lahore.
Background: Smog forms when smoke and fog combine with pollutants.
Did you know? Lahore is often among the cities with the worst air quality in the world in winter.
Memory trick: Smog = smoke + fog.
Correct answer: Dispersion. A rainbow forms when sunlight is refracted, reflected, and dispersed (split into colours) by raindrops.
Background: Dispersion splits white light into its seven colours.
Did you know? The colours are remembered as VIBGYOR.
Memory trick: Rainbow = dispersion of light.
Correct answer: Paramecium. Paramecium has two nuclei: a large macronucleus and a small micronucleus.
Background: The macronucleus controls daily activities, and the micronucleus is used in reproduction.
Did you know? Paramecium moves with tiny hair-like cilia.
Memory trick: Para-mecium = a pair of nuclei.
Correct answer: Mass & Energy. E = mc² shows that mass and energy are equivalent and can be converted into each other.
Background: Here c is the speed of light.
Did you know? The equation explains the energy released in nuclear reactions.
Memory trick: E = energy, m = mass.
Correct answer: Mathematics. In common exam terms, mathematics is called the mother of all sciences because every science uses it.
Background: Mathematics is also called the “queen of the sciences”.
Did you know? Some authors give this title to philosophy instead.
Memory trick: All sciences use maths.
Correct answer: Graham Bell. Alexander Graham Bell patented the telephone in 1876.
Background: His first words on the telephone were reportedly “Mr. Watson, come here”.
Did you know? Bell’s patent was granted on 7 March 1876.
Memory trick: Bell → Telephone.
Correct answer: Both A & B. Traditional fans use electromagnets (induction motors), while modern BLDC fans use electromagnetic coils together with permanent magnets.
Background: BLDC stands for brushless direct current motor.
Did you know? BLDC fans use much less electricity.
Memory trick: Old fan = electromagnet; new fan = both.
Correct answer: Cow. A cow is an herbivore, which means it eats only plants.
Background: Herbivores usually have flat teeth for grinding.
Did you know? Animals that eat both plants and meat are omnivores.
Memory trick: Cow = grass-eater.
Biology, Chemistry, Physics, Environmental Science, and General Science concepts commonly asked in PPSC, FPSC, CSS, and PMS exams.
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