Practise 24 real Federal Board questions on Properties of Matter from 2023 to 2026. See the answer and explanation as soon as you answer.
Properties of Matter is one of the 16 main chapters in our Federal Board Matric Physics question bank (9th class), and about 6% of its real questions come from it. Tayyari Karo has 24 real questions on this chapter from 2023 to 2026; 2 are multiple choice and marked instantly, and the rest are short and long questions with a model answer. By difficulty: 13 easy, 11 medium.
Work through the questions below, then open the explanation for each one. Redo the ones you missed a few days later.
These are real past-paper questions. Think of your answer first, then open the explanation.
Density of a substance can be calculated by using:
Answer: A. Archimedes principle
Weighing an object in air and in water (Archimedes' principle) gives its density.
Which of the following is NOT a unit of pressure?
Answer: D. kg m⁻³
kg m⁻³ is the unit of density. Pa, N m⁻² and atmosphere (atm) are all units of pressure.
What is meant by density? Also write its formula and unit.
Density is the mass of a substance per unit volume. It tells how compact the matter is.
Formula: ρ = m/V
SI unit: kg m⁻³ (also g cm⁻³; 1 g cm⁻³ = 1000 kg m⁻³).
Briefly describe any three applications of liquid barometer.
1. Weather forecasting — a falling barometer reading indicates low pressure (rain/storm), a rising reading indicates fair weather.
2. Measuring altitude — atmospheric pressure decreases with height, so a barometer (altimeter) tells the height of an aircraft or a mountaineer.
3. Laboratory/industrial use — measuring atmospheric pressure precisely for experiments (e.g. boiling‑point corrections) and in scientific stations.
Calculate the force required to lift a car weighing 2000 kg by a hydraulic jack whose small piston has an area of 4 cm² whereas its large piston has an area of 80 cm².
Weight of car (load on large piston) F₂ = mg = 2000 × 10 = 20,000 N
A₁ = 4 cm², A₂ = 80 cm² (units cancel in the ratio)
By Pascal's principle: F₁/A₁ = F₂/A₂
F₁ = F₂ × A₁/A₂ = 20,000 × 4/80 = 1000 N
So a force of only 1000 N (one‑twentieth of the car's weight) on the small piston lifts the car.
Derive formula for liquid pressure.
Consider a column of liquid of density ρ, height h and base area A.
Volume V = Ah; mass m = ρAh; weight w = ρAhg.
Pressure at the base = force/area = w/A = ρAhg/A
P = ρgh — liquid pressure depends on depth and density only.
Calculate the force required to lift a car weighing 2500 kg by a hydraulic jack whose small piston has an area of 6 cm² whereas its large piston has an area of 90 cm².
Load on large piston F₂ = mg = 2500 × 10 = 25,000 N
A₁ = 6 cm², A₂ = 90 cm²
Pascal's principle: F₁/A₁ = F₂/A₂ ⇒ F₁ = F₂ × A₁/A₂ = 25,000 × 6/90 = 1667 N ≈ 1.67 × 10³ N
Explain that liquids exert pressure. Show that liquid pressure depends on depth and density of liquid.
A liquid has weight, so it presses on the bottom and walls of its container and on any object immersed in it: liquids exert pressure. Water spurts out of holes in a can, and the deeper the hole the faster the jet.
Derivation: Consider a cylindrical column of liquid of density ρ, height h and base area A inside the liquid.
Volume of the column V = A h; mass m = ρV = ρAh; weight w = mg = ρAhg.
This weight acts on the base of area A, so the pressure at depth h is
P = w/A = ρAhg / A ⇒ P = ρgh
Hence liquid pressure is directly proportional to the depth h and to the density ρ of the liquid (g being constant). It does not depend on the shape or area of the container. …
The full model answer is in the app.
| Session | Questions |
|---|---|
| 2026 Annual | 3 |
| 2025 1st Annual | 6 |
| 2025 2nd Annual | 7 |
| 2024 Annual | 4 |
| 2023 Annual | 4 |
24 real Federal Board (FBISE) Physics questions on Properties of Matter from 2023 to 2026, for 9th class. Each one shows the session it came from.
No. We could not find an official FBISE marking scheme for these papers, so the answers and explanations are written by Tayyari Karo for practice. Check anything important with your teacher or textbook.
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