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Punjab (PTB) · Chapter test · Free

9th Class Physics Chapter 3 TestDynamics

30 marks · 40 minutes · 21 questions. Covers: CHAP 3: Dynamics.

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9th Class Physics Chapter 3 Test

9th Class · Physics · Punjab (PTB)

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 is a contact force?

    1. Gravitational force

    2. Magnetic force

    3. Normal force

    4. Electrostatic force

  2. Sir Isaac Newton was born in Lincolnshire on:

    1. April 4, 1643

    2. March 4, 1643

    3. February 4, 1643

    4. January 4, 1643

  3. According to the law of conservation of momentum.

  4. Famous book of Sir Isaac Newton is:

    1. Principia Mathematica

    2. Principia Physics

    3. Principia chemistry

    4. Principia science

  5. Which type of force that help us to walk on the ground:

    1. Force of friction

    2. Drag force

    3. Tension force

    4. Elastic force

  6. A force acts on a body for 2 seconds and it produces 50 kg m/s change in its momentum. The force acting on the body is:

    1. 100 N

    2. 50 N

    3. 25 N

    4. 2 N

  7. The ...... of an object is a measure of its intertia:

    1. Mass

    2. Velocity

    3. Force

    4. Volume

  8. A large force acts on an object for a very short interval of time. In this case, it is easy to determine:

    1. Magnitude of force

    2. Time interval

    3. Product of force and time

    4. None of these

  9. Net force on the body falling in air with uniform velocity is equal to ......:

    1. Weight of the body

    2. Air resistance of the body

    3. Difference of weight of body and air resistance on it

    4. Zero

  10. One newton is equal to:

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

  1. Define momentum. Write its unit.

  2. Inflatable air bags are installed in the vehicles as safety equipment. In terms of momentum, what is the advantage of air bags over seat belts? 

  3. Write an advantage of electronic balance over mechanical balance.

  4. What is elastic force? Give its examples.

  5. Define inertia.

  6. Define Contact Forces with example.

  7. Differentiate between strong and weak nuclear force.

  8. Define streamline flow.

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

  1. Explain the term rolling friction briefly.

  2. (i)State and derive Newton's Second Law of Motion.(ii) Write effect of force on velocity.

  3. A cyclist weighing 55 kg rides a bicycle of mass 5 kg. He start from rest and applies a force of 90 N for 8 seconds. Then he continues at a constant speed for another 8 seconds . Calculate the total distance travelled by the cyclist.