NCERT Class 9 Science MCQ Chapter 6 How Forces Affect Motion English Medium As Per New Syllabus. NCERT Class 9 Science MCQ Chapter 6 How Forces Affect Motion Notes to each chapter is provided in the list so that you can easily browse throughout different chapter NCERT Class 9 Science MCQ Chapter 6 How Forces Affect Motion Question Answer Download PDF and select needs one. CBSE Class 9 Science Multiple Choice Solutions.
NCERT Class 9 Science MCQ Chapter 6 How Forces Affect Motion
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How Forces Affect Motion
Chapter – 6
| MCQ |
Tick the Correct Options:
1. What is the SI unit of force?
(a) Metre.
(b) Newton.
(c) Joule.
(d) Kilogram.
Ans: (b) Newton.
2. Which physical quantity requires specifying both magnitude and direction?
(a) Mass.
(b) Distance.
(c) Force.
(d) Time.
Ans: (c) Force.
3. Which instrument can be used to measure the magnitude of a force, such as the weight of an object?
(a) Speedometer.
(b) Thermometer.
(c) Barometer.
(d) Spring balance.
Ans: (d) Spring balance.
4. In everyday life, what are the smallest forces we can directly feel (like a light touch) measured in?
(a) Millinewtons.
(b) Yoctonewtons.
(c) Kilonewtons.
(d) Centinewtons.
Ans: (a) Millinewtons.
5. Two forces that are equal in magnitude but opposite in direction applied to an object are called:
(a) Unbalanced forces.
(b) Balanced forces.
(c) Net forces.
(d) Gravitational forces.
Ans: (b) Balanced forces.
6. If two people apply forces in the same direction on a stalled car, the magnitude of the net force is:
(a) The difference between the magnitudes of the two forces.
(b) Zero.
(c) The sum of the magnitudes of the two forces.
(d) Equal to the larger force.
Ans: (c) The sum of the magnitudes of the two forces.
7. Which force acts in the upward direction perpendicular to the surface an object is placed on?
(a) Force of friction.
(b) Gravitational force.
(c) Normal force.
(d) Buoyant force.
Ans: (c) Normal force.
8. What force must be overcome for an object at rest on a floor to start moving when pushed?
(a) Normal force.
(b) Force of friction.
(c) Gravitational force.
(d) Air resistance.
Ans: (b) Force of friction.
9. Who argued through thought experiments in the 17th century that a body moves indefinitely along a horizontal plane if all impediments are removed?
(a) Galileo Galilei.
(b) Isaac Newton.
(c) Aristotle.
(d) Albert Einstein.
Ans: (a) Galileo Galilei.
10. What term did Isaac Newton use to describe the tendency of objects to resist change in their state of rest or uniform motion?
(a) Velocity.
(b) Acceleration.
(c) Momentum.
(d) Inertia.
Ans: (d) Inertia.
11. According to Newton’s first law of motion, an object in motion continues to move with a constant velocity unless:
(a) It runs out of energy.
(b) A net force acts upon it.
(c) Friction is eliminated.
(d) Its mass increases.
Ans: (b) A net force acts upon it.
12. If an object is moving with a constant velocity, its acceleration is:
(a) Zero.
(b) Increasing.
(c) Decreasing.
(d) Constant but non-zero.
Ans: (a) Zero.
13. According to Newton’s second law of motion, the magnitude of acceleration is:
(a) Inversely proportional to the net force.
(b) Proportional to the net force and inversely proportional to the mass.
(c) Proportional to the mass and inversely proportional to the net force.
(d) Independent of the object’s mass.
Ans: (b) Proportional to the net force and inversely proportional to the mass.
14. What is the mathematical expression for Newton’s second law of motion?
(a) F = m/a.
(b) F = a/m.
(c) F = ma.
(d) F = m − a.
Ans: (c) F = ma.
15. One newton is defined as the force that produces an acceleration of 1 m s⁻² on an object of mass:
(a) 100 grams.
(b) 10 kilograms.
(c) 1 kilogram.
(d) 1 gram.
Ans: (c) 1 kilogram.
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