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

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

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

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

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

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

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

His Nobel Prize-winning work was on electroweak unification.

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

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

A meter rule measures lengths in centimeters and millimeters.

Vernier caliper can measure inside, outside, and depth.

4.500 has 4 sig figs.

Scientific method starts with observing a problem or a phenomenon.

“Micro” = one-millionth = 10⁻⁶.

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

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

He improved scientific thinking and contributed to optics and mathematics.

Time is a fundamental base quantity measured in seconds.

He encouraged science development and education in Pakistan.

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

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

Physics explains how matter and energy interact in the universe.

“Centi” means 1/100 = 10⁻².

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

Least count defines the minimum measurable quantity.

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

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

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

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

Measuring cylinders have volume markings in mL.

Screw gauge is best for very small thickness.

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

He encouraged logical thinking and scientific reasoning.

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

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

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

If dropping digit > 5 → round UP.

The SI unit of time is second (s).

Ibn al-Haitham introduced experimentation to test scientific ideas.

He studied metallurgy and nuclear engineering in Europe.

Speed is derived from length divided by time.

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

Next digit is 1 (<5) → keep 4.32.

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

Joule (J) is derived from kg·m²/s².

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

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

Example: 205 → all three digits are significant.

Moving the decimal 3 places to the left gives 0.005.

Volume is derived from length × width × height.

Derived quantities are formed using combinations of base quantities.

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

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

Vernier caliper can measure round objects accurately.

More divisions → smaller least count → more accuracy.

Newton (N) is a derived unit for force.

Next digit is 1 → 9.95 becomes 9.96.

Temperature is a base quantity in SI units.

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

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

He used experiments to verify scientific ideas.

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

Physics explains machines, forces, and motion.

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

“Mega” means 1,000,000 = 10⁶.

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

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

Sig figs are 5, 0, 6, 0 → total 4.

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

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

Vernier caliper typically has a least count of 0.1 mm.

Vernier caliper is used for accurate measurement of length.

Screw gauge is used to measure very small thickness accurately.

Screw gauge has a circular scale for fine readings.

Numbers 1–9 are always significant.

Mass is one of the seven SI base quantities.

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

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

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

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

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

Yaqub Kindi made early contributions in optics and mathematics.

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

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

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

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

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

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

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

Physical balance compares masses of objects.

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

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

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

The number with 4 sig figs is d) 0.560?

Screw gauge has the highest accuracy (0.01 mm).

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

“Milli” means one-thousandth = 10⁻³.

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

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

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

“Kilo” means 1000, which is 10³.

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

Trailing zeros without decimal → ambiguous.

He used geometry to calculate mountain heights accurately.

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

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

The depth rod extends to measure holes or cavities.

Pascal (Pa) is a derived unit of pressure.

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

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

Any number raised to the power 0 equals 1.

Stopwatch measures time accurately.

He used scientific methods involving angles and shadows.

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

Mechanics studies motion and the forces that affect motion.

Optics deals with the behavior and properties of light.

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

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

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

“Giga” means one-billion = 10⁹.

10² = 100, so 7.2 × 100 = 720.

“Nano” = one-billionth = 10⁻⁹.

Thermodynamics focuses on heat and temperature.

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

If dropping digit < 5 → no change.

Volume is found by water displacement in a measuring cylinder.

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

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

A stopwatch measures time intervals.

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

“Pico” = one-trillionth = 10⁻¹².

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

Zoology is a branch of biology, not physics.

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

Counting places moved tells the exponent of 10.

Isaac Newton is commonly known as the Father of Physics.

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

Physical balance compares two masses using two pans.

He compared densities of many substances using scientific methods.

Vernier caliper includes both scales for accurate measurements.

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

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

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

“Tera” = 1,000,000,000,000 = 10¹².

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

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

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

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

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

Scientific notation helps express extremely large or small values easily.

Stopwatch measures time intervals.