Physical Quantities & Measurements Chapter 1 Class 9 Physics KPK Board MCQs | Class Nine Physics Chapter 1 MCQs KPK Board

Scientific method starts with observing a problem or a phenomenon.

Only 4.5 is between 1 and 10, making option (c) correct.

Physics studies the formation, structure, and behavior of the universe.

Screw gauge has the highest accuracy (0.01 mm).

The Quran states that the sun and moon move in their fixed courses, matching astronomical observations.

Smartphones work due to electrical circuits and electromagnetic waves, studied in physics.

A meter rule measures lengths in centimeters and millimeters.

Any number raised to the power 0 equals 1.

He was involved with CERN and contributed to theoretical particle physics.

Derived quantities are formed using combinations of base quantities.

Vernier caliper typically has a least count of 0.1 mm.

Speed is derived from length divided by time.

3,200,000 → 3.2 × 10⁶ (moved 6 places).

Sig figs are 5, 0, 6, 0 → total 4.

Trailing zeros without decimal → ambiguous.

Ibn al-Haitham is called the Father of Optics because of his scientific studies of light.

He encouraged logical thinking and scientific reasoning.

Screw gauge has a circular scale for fine readings.

Kitab al-Manazir is his famous book on the science of optics.

Force is a derived quantity (F = m × a).

Kilogram (kg) is the SI base unit of mass.

He compared densities of many substances using scientific methods.

Ibn al-Haitham introduced experimentation to test scientific ideas.

He encouraged science development and education in Pakistan.

Measuring cylinders have volume markings in mL.

Decimal moves 3 places to the right, so exponent is −3.

He played a major role in developing Pakistan’s nuclear capabilities.

Density is formed by dividing mass by volume, so it is derived.

Volume is found by water displacement in a measuring cylinder.

Meter (m) is the standard SI base unit for length.

3000 = 3 × 10³ because the decimal moves 3 places.

Standard form uses the format a × 10ⁿ, where 1 ≤ a < 10.

Physical balance compares two masses using two pans.

He specialized in metallurgy, which is important in nuclear technology.

Physics is the study of matter, energy, and the laws governing them.

Zoology is a branch of biology, not physics.

Moving the decimal 3 places to the left gives 0.005.

Least count defines the minimum measurable quantity.

Counting places moved tells the exponent of 10.

Leading zeros don’t count; only 9 is significant.

Ampere (A) is the SI base unit of electric current.

Kelvin (K) is the SI unit of temperature, a base quantity.

“Kilo” means 1000, which is 10³.

Screw gauge is used to measure very small thickness accurately.

A stopwatch measures time intervals.

He wrote Kitab-ul-Hind, a scientific study of India’s culture, math, and science.

He studied minerals, their density, and various physical properties.

Thermodynamics focuses on heat and temperature.

Second (s) is the SI base unit of time.

He studied metallurgy and nuclear engineering in Europe.

Moving the decimal 4 places to the right gives exponent –4.

Screw gauge is very accurate with a least count of 0.01 mm.

Decimal present → all zeros count → 1,0,0,0 → 4 sig figs.

He used geometry to calculate mountain heights accurately.

Third digit is 7 (>5) → 5.6 becomes 5.7.

More divisions → smaller least count → more accuracy.

Next digit is 1 (<5) → keep 4.32.

“Giga” means one-billion = 10⁹.

Significant digits: 3,0,4,0 → 4 sig figs.

Moving right means the number was originally very small → negative exponent.

“Centi” means 1/100 = 10⁻².

Newton (N) is a derived unit for force.

Base quantities are independent and cannot be written using other quantities.

Joule (J) is derived from kg·m²/s².

The Quran motivates learning about the universe and its physical phenomena.

Optics deals with the behavior and properties of light.

“Tera” = 1,000,000,000,000 = 10¹².

The standard SI unit for length is meter (m).

Physics explains machines, forces, and motion.

The first part (a) must be at least 1 but less than 10.

He used scientific methods involving angles and shadows.

Volume is derived from length × width × height.

“Pico” (10⁻¹²) is smaller than milli (10⁻³), micro (10⁻⁶), and nano (10⁻⁹).

Stopwatch measures time accurately.

Next digit is 1 → 9.95 becomes 9.96.

Vernier caliper can measure round objects accurately.

He corrected the old belief and explained that vision happens when light from objects enters the eyes.

He studied how sound travels and how the human ear receives sound.

A positive exponent moves the decimal right, and a negative exponent moves it left.

Physics explains natural laws, which enhances appreciation of the universe mentioned in the Quran.

Example: 205 → all three digits are significant.

Standard/scientific form always requires a number between 1 and 10.

Both the Quran and physics promote the study of the universe to gain knowledge.

2.0 → significant digits: 2 and 0 → 2 sig figs.

The number with 4 sig figs is d) 0.560?

He used experiments to verify scientific ideas.

Dr. Abdus Salam received the Nobel Prize in Physics in 1979 for his work on electroweak theory.

The Quran repeatedly invites humans to think, observe, and understand the natural world.

Standard form requires shifting the decimal point to make a number between 1 and 10.

“Milli” means one-thousandth = 10⁻³.

Screw gauge is best for very small thickness.

Physics explains how matter and energy interact in the universe.

Vectors include magnitude + direction (e.g., force, velocity).

Trailing zero without decimal is NOT significant → 25 → 2 significant figures.

Time is a fundamental base quantity measured in seconds.

The Quran repeatedly asks humans to think, reflect, and observe the world.

He contributed to the development of PINSTECH and science education in Pakistan.

Trailing zeros after decimal ARE significant → 7.00 = 3 significant figures.

Scientific notation helps express extremely large or small values easily.

“Pico” = one-trillionth = 10⁻¹².

If dropping digit < 5 → no change.

Moving left makes the number smaller, so exponent becomes positive.

Scalars have only magnitude (e.g., time, mass).

Ibn al-Haitham explained how the pinhole camera forms images.

Speed is measured in meters per second, a derived unit.

Yaqub Kindi made early contributions in optics and mathematics.

Physical balance compares masses of objects.

Third digit is 9 (>5) → 2.4 becomes 2.5.

Electric current (a base quantity) is measured in amperes.

His work was central to Pakistan becoming a nuclear-capable nation.

“Nano” = one-billionth = 10⁻⁹.

Leading zeros are not counted → digits 4 and 5 are significant.

Numbers 1–9 are always significant.

If dropping digit > 5 → round UP.

The Quran describes natural phenomena as “signs” (Ayat) of Allah.

He wrote over 200 books on philosophy, mathematics, and science.

Vernier caliper is used for accurate measurement of length.

He played an important role in translating Greek scientific works into Arabic.

1 mm = 0.1 cm is the smallest reading on most meter rules.

7, 0, 0 (decimal present → all significant).

Mass is one of the seven SI base quantities.

Vernier caliper includes both scales for accurate measurements.

Mechanics studies motion and the forces that affect motion.

Vernier caliper can measure inside, outside, and depth.

A.Q. Khan is known as the key figure behind Pakistan’s nuclear program.

Pascal (Pa) is a derived unit of pressure.

Temperature is a base quantity in SI units.

In standard form, the first number must be 1 to 10, but 0.2 is less than 1.

Standard form uses the format A × 10ⁿ, where A is between 1 and 10.

Kelvin (K) is the SI base unit of temperature.

Pascal (Pa) = Newton per square meter (N/m²).

“Mega” means 1,000,000 = 10⁶.

His Nobel Prize-winning work was on electroweak unification.

The SI unit of time is second (s).

Speed is derived from length/time, so it is a derived quantity.

He proved that objects send light into the eye, forming images.

“Micro” = one-millionth = 10⁻⁶.

He proved light travels in straight lines, a basic concept in optics.

The standard SI unit of mass is kilogram (kg).

Isaac Newton is commonly known as the Father of Physics.

The depth rod extends to measure holes or cavities.

Next digit is 6 (>5) → 7.8 becomes 7.9.

Length can be measured, so it is a physical quantity.

The Quran mentions balance and order, which aligns with physical laws governing the universe.

4.500 has 4 sig figs.

Stopwatch measures time intervals.

10² = 100, so 7.2 × 100 = 720.

4500 → 4.5 × 10³ (decimal moves 3 places left).

Al-Biruni worked in astronomy, physics, and mathematics.

He improved scientific thinking and contributed to optics and mathematics.

Observing these objects helps understand physics concepts like motion, gravity, and light.