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Federal (FBISE) · Chapter test · Free

9th Class General Science Chapter 9 Test09. Forces

30 marks · 40 minutes · 21 questions. Covers: 09. Forces.

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9th Class General Science Chapter 9 Test

9th Class · General Science · Federal (FBISE)

Name: ____________Roll No: ________Class/Section: ________Date: ________Total marks: 30Time: 40 minutes

Q1. Multiple choice questions (Attempt all · 10 × 1 = 10)

  1. Which of the following produces least friction?
    1. Sliding friction
    2. Rolling friction
    3. Static friction
    4. Kinetic friction
  2. The weight of an object at the Moon’s surface is _______ of the weight on Earth.
    1. 46028
    2. 46027
    3. 46025
    4. 46024
  3. As a fielder you roll a ball in the cricket ground, it stops before reaching the bowler due to:
    1. energy
    2. temperature
    3. pressure
    4. friction
  4. Which material property affects the friction?
    1. Density
    2. hardness
    3. surface roughness
    4. melting point
  5. The earth’s atmosphere is held by:
    1. strong force
    2. weak force
    3. electromagnetic force
    4. gravitational force
  6. ________ Force is blind to charge.
    1. strong force
    2. weak force
    3. electromagnetic force
    4. gravitational force
  7. Efficiency of a machine can never be 100% in real cases due to ________ force:
    1. gravitational
    2. electric
    3. friction
    4. nuclear
  8. Which of the following method can reduce the friction?
    1. Increasing surface roughness
    2. applying lubricant
    3. Increasing pressure
    4. using sticky materials
  9. What is the efficiency of a machine when the input is 263 J and the output is 142 J?
    1. 0.0185
    2. 0.0539
    3. 0.185
    4. 0.539
  10. The weight of a 5 kg box on the surface of Mars will be:
    1. 5 N
    2. 9.8 N
    3. 18.5 N
    4. 49 N

Q2. Short questions (Attempt any 6 of 8 · 6 × 2 = 12)

  1. What is the magnitude of the gravitational force at the Earth’s centre? Justify your answer.
  2. A diesel engine has efficiency 35%. What does it mean?
  3. Why the ups and down are engraved on the tyres of your car? Explain.
  4. Without friction the life on Earth would not be the same. Justify the statement.
  5. It is difficult to walk on slippery floor, why?
  6. Why a machine cannot be 100% efficient?
  7. How gravitational force is different from the electromagnetic force?
  8. Why a person can move faster using roller skaters as compared to using flat shoes?

Q3. Long questions (Attempt any 2 of 3 · 2 × 4 = 8)

  1. Define and explain efficiency. Also show that efficiency of any real machine can never be 100%.
  2. Short range forces are called nuclear forces i.e. the strong nuclear force and the weak nuclear force, describe them with their application.
  3. Differentiate between contact and non-contact forces, also show that gravitational force is a non-contact force with the help of daily life examples.