Class 9th Science Chapter – 8 Force and Laws of Motion
| Textbook | NCERT |
| Class | 9th |
| Subject | Science |
| Chapter | 8th |
| Chapter Name | Force and Laws of Motion |
| Category | Class 9th Science |
| Medium | English |
| Source | Last Doubt |
| Class 9th Science Chapter – 8 Force and Laws of Motion MCQ with answer were prepared based on the latest exam pattern. We have Provided Force and to help students understand the concept very well. What is law of motion ?, What is inertia notes?, What is the SI unit of force?,What are the 3 types of Newton law?, What is Newton’s law formula?, What is Newton’s 2nd law called?, What is Newton’s first law called?, What is called inertia?, What is Newton’s second law?, What is velocity?, What is 9.8 newton equal to? |
Class 9 Science Chapter- 8 Force and Laws of Motion
Chapter – 8
Force and Laws of Motion
MCQ
| (1) Linear momentum of an object is 250 g cm/s. If the velocity of the object is 5 m/s, then the mass of the object is _____? A. 5 Kg B. 0.5 g C. 5 mg D. 0.5 mg Answer – (B) 0.5 g |
| (2) Newton’s second law of motion is ________? A. F = mv B. F = p2 – p1 t2 – t1 C. F = v2 – v1 t2 – t1 D. F = s2 – s1 t2 – t1 Answer – (B) F = p2 – p1 t2 – t1 |
| (3) Force is the rate of change of _______? A. Momentum B. Velocity C. Displacement D. Acceleration Answer – (A) Momentum |
| (4) The magnitude of the impulse on the object is ____? A. 0 N s B. 107 dyne s C. 1 N s D. 10 N s Answer – (D) 10 N s |
| (5) The average force acted on the object is ______? A. 0.1 N B. 0.003 N C. 3.3 N D. 3 N Answer – (C) 3.3 N |
| (6) In SI system, the gravitational unit of force is ________? A. Kg m s-2 B. Kgf C. M/s D. Metre Answer – (B) kgf |
| (7) Identify the force which cannot act without any physical contact? A. Frictional force B. Gravitational force C. Electrostatic force D. Magnetic force Answer – (A) Frictional force |
| (8) The frictional force that is dependent on the area of surfaces in contact is __________friction? A. Static B. Rolling C. Sliding D. Kinetic Answer – (B) Rolling |
| (9) Which one of the following is not a vector quantity? A. Speed B. Momentum C. Impulse D. Force Answer – (A) Speed |
| (10) Which of the following objects has greater inertia? A. A thermocol ball B. A plastic ball C. A paper ball D. A solid iron ball Answer – (D) A solid iron ball |
| (11) 1 kgf is equal to _________? A. 9.8 N B. 980 dynes C. 9800 kg m s-2 D. 105 dynes Answer – (A) 9.8 N |
| (12) Which of the following statements is true about force? A. It cannot be seen. B. It can move a stationary body. C. It can change the shape of a body. D. All of the above Answer – (D) All of the above |
| (13) A body of mass 3 kg moves with a velocity of 500 cm/s, the momentum of the body is _______? A. 150 kg m/s B. 15 x 109 kg m/s C. 15 x 10-9 kg m/s D. 15 kg m/s Answer – (B) 15 x 109 kg m/s |
| (14) If the velocity-time graph representing the motion of a body is parallel to time-axis, then the net force acting on the body is_____? A. 10 N B. 100 N C. 1 N D. None of these Answer – (C) 1 N |
| (15) _____is responsible for change in magnitude of speed? A. Momentum B. Force C. Inertia D. Kinetic energy. Answer – (B) Force |
| (16) In the absence of external force the velocity? A. Remains constant. B. Vanishes. C. Changes continuously. D. None of these. Answer – (A) Remains constant. |
| (17) Newton’s first law introduces the concept of? A. Momentum B. Inertia C. Conservation of energy. D. Action and reaction. Answer – (B) inertia |
| (18) Newton’s first law introduces the concept of? A. Momentum B. Inertia C. Conservation of energy. D. Action and reaction. Answer – (A) momentum |
| (19) State of rest and state of motions are? A. Equal B. Unequal C. None of these D. Can not say Answer – (A) Equal |
| (20) Which object has greater inertia? A. Rubber ball B. Gas cylinder C. Bicycle D. Truck Answer – (D) Truck |
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