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 “Al-Manzir”?

• Al-Beruni
• Newton
• Ibn-ul-Haithem
• Al Kindi

ii. Least count of Vernier Callipers is

• 1 mm
• 0.001 mm
• 0.001 cm
• 0.01 cm

iii. Which of the following is the Base Quantity?

• Speed
• Area
• Volume
• Temperature

iv. If mass of a body is doubled while keeping the force constant, then the acceleration will be ________

• One half
• Doubled
• One fourth
• Four times

v. If Fx = Fy then the angle θ which the vector F makes with the horizontal is of

• 0⁰
• 45⁰
• 90⁰
• 180⁰

vi. The resultant of two forces acting on the same point simultaneously will be the greatest when the angle between them is

• 180⁰
• 45⁰
• 0⁰
• 90⁰

vii. Which of the following state of equilibrium does a meter rod balanced on a wedge represent?

• Stable
• Unstable
• Neutral
• None of these

viii. Which of the following units is equal to Kgm²s-²?

• Joule
• Newton
• Watt
• Metre

ix. At what temperature the surface tension of liquid will be maximum?

• 0⁰C
• 100⁰C
• 20⁰C
• 50⁰C

xi. When water changes into ice, it ________.

• Contracts
• Expands
• Becomes dense
• Remains the same

xii. If a car is moving with uniform speed in a circle, its acceleration will be

• Uniform
• Zero
• Variable
• Average

SECTION “B”

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

i. Write any three methods to reduce friction.

ii. A player throws a cricket ball with a velocity of 40ms-1 at an angle of 60o with the ground. Find the horizontal and vertical components of the velocity of the ball.

iii. Why is the outer bank of the road kept slightly higher than the inner bank?

iv. Is there any difference between the values of ‘g’ at the equator and at the poles? Explain.

v. An electric motor lifts a weight of 2N upto a height of 5m in 4 seconds. Find the power of the motor.

vi. What are “Geostationary Satellites”?

vii. Write down the properties of Liquid Pressure.

viii. When an inflated balloon is heated, why it bursts?

ix. Why does the climate of the regions near seashore remain moderate?

x. Which thermal phenomenon is indicated in the given graph? Explain briefly.

GRAPH

xi. Why the cooking utensils are made of metals. Also explain why wood or plastic is used for spoon handles or other holders?

xii. A ship is mostly made of iron. How does it floats on the sea surface with thousands tons of luggage?

xiii. Volume of the gas enclosed in a cylinder is 2m. What would be its volume if keeping the pressure constant doubles its temperature?

SECTION “C”

NOTE: Attempt any TWO questions. (20)

Q.3. (a) Prove that S=Vit + 1/2 at²
Q.3. (b) The mass of a car is 500 kg. In order to raise is velocity from rest to 40ms-1 in 20 seconds, how much force will be required.
Q.3. (c) Can a body moving with certain velocity in the direction of west? Explain.

Q.4. (a) Write three “States of Equilibrium”. Give one example of each.
Q.4. (b) Find the “Mass of Earth” by applying “Newton’s Law of Gravitation”.

Q.5. (a) What is a “Screw Jack”? Find its Mechanical Advantage.
Q.5. (b) State and explain “Boyle’s Law” and “Charles Law”.
Q.5. (c) State “Hooke’s Law”