Federal Board Class IX Physics

SECTION “A”

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

i. What state is the matter of sun in?

• Solid
• Gas
• Plasma
• Liquid

ii. What is the minimum length that an instrument can measure called?

• Its scalar
• Its least count
• Its maximum value
• Its pitch

iii. A ball is dropped from the top of a tower. What is the distance covered by it in the first second?

• 100 m
• 50 m
• 10 m
• 5 m

iv. A lead shot of mass 5g is fired with an air gun. If the velocity of the shot is 60m/sec. What is its momentum?

• 0.6 Kgm/sec
• 0.3 Kgm/sec
• 3 Kgm/sec
• 300 Kgm/sec

v. What is the product (force x moment arm) called?

• Torque
• Energy
• Mass
• Power

vi. A satellite is revolving around the earth in a circular orbit, with a velocity V. If the radius of the orbit is increased from R to 2R. What will be its new velocity?

• 2V
• V2
• V/2
• 2/V

vii. What is the S.I unit of power?

• Joule
• Watt
• Newton
• Dyne

viii. What is the mechanical advantage of a screw jack?

• 2πh/l
• 2πh/h
• 1/2πh
• h/2πh

ix. What happens to water when it changes into ice?

• It contracts
• It expands
• It remains the same
• None of these

x. What is the unit of pressure and stress?

• N/m²
• N x m²
• m²/N
• N x m

xi. By what process does the heat from the sun reach the Earth?

• Conduction
• Convection
• Radiation
• None of these

xii. What is the characteristic of a body due to which it tends to retain its state of rest or of motion known as?

• Weight
• Force
• Inertia
• Mass

SECTION “B”

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

i. What is scientific method? What are its different stages?

ii. How can you find out the least count of a pair of vernier calipers and a screw gauge?

iii. If a car is moving with uniform speed in a circle, what will be its velocity.

iv. What is the difference between velocities and speed?

v. (a) Under what condition the sum of three Vectors is zero?
(b) Under what condition the distance and displacement between two points will be equal?

vi. Differentiate between weight and mass.

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

viii. Write any three advantages of friction.

ix. Differentiate between heat and temperature.

x. At what temperature would the Celsius and the Fahrenheit temperature be equal?

xi. Under what condition would work done be zero.

xii. A ship is mostly made of iron. But it floats on the sea surface with luggage. Explain how.

SECTION “C”

NOTE: Attempt any TWO questions. (20)

Q.3. (a) Find the mass of the Earth by applying Newton’s Law of Gravitation. (05)
(b) Prove that S = Vit + ½ at² (03)
(c) Define inertia. Explain it with the help of an example.

Q.4. (a) What is meant by an inclined plane? Also find M.A. of it.
(b) A motor pulls 2000 Kg of water in one hour from a 50 m deep well. Find the power of the motor.
(c) Define

• Negative vector
• Torque

Q.5. (a) In the figure given below find the amount of heat transferred from end x to y in time t. Also, write the factors upon which transfer to heat depends.

(b) Volume of the gas enclosed in a cylinder is 2m. What would be its volume if its temperature is doubled keeping the pressure constant? (03)
(c) Define (02)

• Conduction
• Radiation