Force and Laws of Motion (बल तथा गति के नियम) Ch(8) Practice Quiz in Hindi Part – 1 || Class 9 Science Practice Quizzes in English Posted on February 28, 2025February 28, 2025 by Anshul Gupta0% 0 votes, 0 avg 1 Force and Laws of Motion (बल तथा गति के नियम) Ch(8)Practice Quiz in Hindi Part – 1 || Class 9 Science Practice Quizzes in English 1 / 201. What is the force that causes a walking person to move forward? A. Force applied by the air on the person B. Force applied by the road on the person C. Force applied by the person on the road D. Force applied by the person on the air Explanation: The force that causes a walking person to move forward is the force applied by the road on the person. 2 / 202. What causes a change in the state of motion of an object? A. Velocity B. Force C. Inertia D. Mass Explanation: A force is required to change the state of motion of an object, either to put it in motion or to stop it. 3 / 203. What is the direction of momentum? A. Opposite to the direction of velocity B. Perpendicular to the direction of velocity C. Same as the direction of velocity D. None of the above Explanation: The direction of momentum is the same as the direction of velocity. 4 / 204. What is the unit of force? A. Newton B. Meter per second squared C. Joule D. Kilogram Explanation: The unit of force is Newton (N). 5 / 205. What is the relationship between mass and inertia? A. The mass of an object is a measure of its inertia. B. None of the above C. Mass is the natural tendency of an object to resist a change in its state of motion or rest. D. Mass and inertia are independent of each other. Explanation: The mass of an object is a measure of its inertia. 6 / 206. What is the force that causes a sailor to jump forward out of a rowing boat? A. Force applied by the boat on the sailor B. Force applied by the water on the boat C. Force applied by the sailor on the boat D. Force applied by the sailor on the water Explanation: The force that causes a sailor to jump forward out of a rowing boat is the force applied by the sailor on the boat. 7 / 207. What is the relationship between action and reaction forces? A. Action and reaction forces are equal in magnitude and act on different bodies. B. Action and reaction forces are unequal in magnitude and act on the same body. C. Action and reaction forces are unequal in magnitude and act on different bodies. D. Action and reaction forces are equal in magnitude and act on the same body. Explanation: Action and reaction forces are equal in magnitude and act on different bodies. 8 / 208. What is the natural state of an object according to ancient philosophers? A. None of the above B. Motion C. Rest D. Both motion and rest Explanation: Ancient philosophers believed that rest was the natural state of an object. 9 / 209. What is the relationship between force and momentum? A. Force is independent of momentum. B. Force is equal to momentum. C. None of the above D. Force is the rate of change of momentum. Explanation: Force is the rate of change of momentum. 10 / 2010. What is the recoil of a gun an example of? A. Third law of motion B. First law of motion C. Second law of motion D. None of the above Explanation: The recoil of a gun is an example of the third law of motion. 11 / 2011. What is the value of the constant of proportionality, k, in the equation F = kma? A. 1 B. 3 C. 2 Explanation: The value of the constant of proportionality, k, is 1. 12 / 2012. What is the tendency of undisturbed objects to stay at rest or to keep moving with the same velocity called? A. Acceleration B. Force C. Momentum D. Inertia Explanation: The tendency of undisturbed objects to stay at rest or to keep moving with the same velocity is called inertia. 13 / 2013. What is the force that opposes motion? A. Tension force B. Gravitational force C. Frictional force D. Muscular force Explanation: The force that opposes motion is frictional force. 14 / 2014. What is the formula for force? A. F = ma B. F = m/a C. F = mv D. F = v/t Explanation: The formula for force is F = ma, where F is force, m is mass, and a is acceleration. 15 / 2015. What is the measure of inertia of an object? A. Acceleration B. Force C. Mass D. Velocity Explanation: The measure of inertia of an object is its mass. 16 / 2016. What is the first law of motion also known as? A. Law of acceleration B. Law of momentum C. Law of inertia D. Law of gravity Explanation: The first law of motion is also known as the law of inertia. 17 / 2017. What is the rate of change of momentum of an object proportional to? A. Mass of the object B. Velocity of the object C. Applied unbalanced force D. Applied balanced force Explanation: The rate of change of momentum of an object is proportional to the applied unbalanced force. 18 / 2018. What is the formula for momentum? A. p = 1/2 mv^2 B. p = mv^2 C. p = m/v D. p = mv Explanation: The formula for momentum is p = mv, where p is momentum, m is mass, and v is velocity. 19 / 2019. What is the SI unit of momentum? A. Meter per second B. Kilogram C. Newton D. Kilogram-meter per second Explanation: The SI unit of momentum is kilogram-meter per second (kg m s^-1). 20 / 2020. What is the third law of motion? A. None of the above B. An object remains in a state of rest or of uniform motion in a straight line unless compelled to change that state by an applied force. C. The rate of change of momentum of an object is proportional to the applied unbalanced force in the direction of force. D. To every action, there is an equal and opposite reaction and they act on two different bodies. Explanation: The third law of motion states that to every action, there is an equal and opposite reaction and they act on two different bodies. 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