Federal Board Class IX Physics

SECTION “A”

Q.1. Insert the correct option i.e. A/B/C/D in the empty box provided opposite each part. Each part carries one mark. (12)

i. Who wrote “Kitab-ul-Astarlab”?

• Ibn-ul-Haithem
• Alberuni
• Alkundi
• Newton

ii. Which of the following is the least count of a screw gauge?

• 0.01 mm
• 0.001 mm
• 1mm
• 0.01 cm

iii. If two quantities are directly proportional to each other, the graph between them is a ________.

• Circle
• Straight line
• Curve
• None of these

iv. The rate of change of displacement is known as ________.

• Speed
• Velocity
• Acceleration
• None of these

v. Acceleration is produced when

• F >fx
• F < fx
• F = fs
• Both A and B

vi. Weight is a ________ quantity.

• Scalar
• Vector
• Base
• None of these

vii. If spanner is held closer to the nut then which of the following will apply?

• Less Force
• Zero Force
• Greater Force
• None of these

viii. A pencil placed vertically on the table is in state of ________.

• Stable Equilibrium
• Unstable Equilibrium
• Neutral Equilibrium
• None of these

ix. If the Uniform speed of a body moving in a circle is doubled then its centripetal force becomes.

• Two times
• Three times
• Four times
• Eight times

x. Work will be maximum when θ is

• 0⁰
• 90⁰
• 180⁰
• None of these

xi. The water flow is fast at the ________ of the canal.

• Banks
• Bottom
• Centre
• None of these

xii. Ventilation of air in house is only possible by ________.

• Conduction
• Convection
• Radiation
• None of these

SECTION “B”

Q.2. Attempt any ELEVEN parts. The answer to each should not exceed 3 to 4 lines. (33)

i. Define ‘Astrophysics’ and ‘Geo Physics’.

ii. Write three equations of motion for freely falling bodies.

iii. When a bullet is fired from a gun, why the gun recoils in the backward direction?

iv. Write any three difference between Mass and Weight.

v. If you start walking forward on a wooden log floating on the surface of water, the log starts moving in the backward direction. What is its reason?

vi. Define Negative Vector.

vii. Write down two conditions of Equilibrium.

viii. Why does a cyclist bend himself towards the inner side of a curved path while taking turn with high speed?

ix. The mass of the moon is 7.35 x 10²² kg and its radius is 1.74 x 10⁶ m. Find the value of gravitational acceleration on the surface of the moon.

x. A saw required a force of 40N to move to and for through a piece of wood. if you move the saw through the wood 30 times, 12 cm forward and 12cm backward, how much work will be done?

xi. Write any three applications of “Pascal’s Law” in daily life.

xii. Find the water pressure on a deep-sea diver at a depth of 10m from the water surface, where the density of seawater is 1030 kg m-3.

xiii. If a car moves forward with some acceleration, then in which direction the friction will act on a box lying on the floor of the car.

xiv. Why does ice float on water?

SECTION “C”

NOTE: Attempt any TWO questions. (20)

Q.3. (a) Prove that 2as = Vf² – Vi²
Q.3. (b) Resolve a vector F into its “Rectangular Components”.
Q.3. (c) A dolphin jumps from the surface of water and returns to the surface of water after reaching the height of 1.8m. Determine the initial speed of the dolphin.

Q.4. (a) Find the orbital speed of the “Satellite”.
Q.4. (b) Find the Mechanical Advantage of an “Inclined Plane”.
Q.4. (c) Define Mechanical Advantage and Efficiency of a machine.

Q.5. (a) State Hooke’ law, Pascal’s law and Archimedes principle.
Q.5. (b) Write any three effects of “Anomalous Expansion of Water”.
Q.5. (c) What will be the increase in length if a brass rod 2m long at temperature 30⁰C is heated to a temperature 100⁰C?