Class 11 Physics

1. Newton's First Law of Motion is also known as the:

• A. Law of inertia
• B. Law of action-reaction
• C. Law of momentum conservation only
• D. Law of gravitation

2. According to Newton's First Law, an object at rest will remain at rest unless acted upon by:

• A. An external unbalanced force
• B. Its own weight
• C. Time alone
• D. Internal forces only

3. The property of a body that resists changes in its state of motion is called:

• A. Inertia
• B. Momentum
• C. Velocity
• D. Force

4. Newton's Second Law of Motion states that the rate of change of momentum of a body is directly proportional to the:

• A. Applied external force
• B. Mass of the body only
• C. Velocity of the body only
• D. Time period only

5. The mathematical expression of Newton's Second Law is commonly written as:

• A. F = ma
• B. F = mv
• C. F = m/a
• D. F = ma²

6. The product of an object's mass and velocity is called its:

• A. Momentum
• B. Force
• C. Inertia
• D. Acceleration

7. Newton's Third Law of Motion states that for every action, there is:

• A. An equal and opposite reaction
• B. A doubled reaction
• C. No reaction at all
• D. A reaction in the same direction

8. According to Newton's Third Law, action and reaction forces act on:

• A. Two different bodies
• B. The same body
• C. No body at all
• D. Only stationary bodies

9. The SI unit of force is the:

• A. Newton
• B. Joule
• C. Watt
• D. Pascal

10. The law of conservation of momentum states that the total momentum of an isolated system remains:

• A. Constant, provided no external force acts on it
• B. Always increasing
• C. Always decreasing
• D. Zero at all times

11. Friction is a force that acts:

• A. Opposite to the direction of relative motion or tendency of motion
• B. In the same direction as motion
• C. Perpendicular to the surface only
• D. Only in circular motion

12. The maximum value of static friction just before an object starts to move is called:

• A. Limiting friction
• B. Kinetic friction
• C. Rolling friction
• D. Zero friction

13. The friction experienced by an object while it is already in motion is called:

• A. Kinetic friction
• B. Static friction
• C. Limiting friction only
• D. Rolling friction exclusively

14. The type of friction that occurs when an object rolls over a surface is called:

• A. Rolling friction
• B. Static friction
• C. Kinetic sliding friction
• D. Limiting friction

15. Which type of friction is generally the smallest in magnitude?

• A. Rolling friction
• B. Static friction
• C. Sliding (kinetic) friction
• D. Limiting friction

16. The force required to keep an object moving in a circular path is called:

• A. Centripetal force
• B. Centrifugal force
• C. Gravitational force only
• D. Frictional force only

17. According to the impulse-momentum theorem, impulse is equal to the:

• A. Change in momentum of the object
• B. Force applied alone
• C. Velocity of the object
• D. Time of contact alone

18. A system on which no external force acts is called a/an:

• A. Isolated system
• B. Open system
• C. Dependent system
• D. Accelerating system

19. The recoil of a gun when a bullet is fired is an example of:

• A. Newton's Third Law and conservation of momentum
• B. Newton's First Law only
• C. Only gravitational force
• D. Only frictional force

20. The equilibrium of a body under the action of several forces means that the net force acting on it is:

• A. Zero
• B. Maximum
• C. Always equal to weight
• D. Undefined

21. If a body moves with constant velocity, the net force acting on it must be:

• A. Zero
• B. Maximum
• C. Continuously increasing
• D. Equal to its weight only

22. The tendency of passengers to lean forward when a bus suddenly stops is explained by:

• A. Inertia of motion
• B. Inertia of rest
• C. Newton's Third Law only
• D. Frictional force only

23. In a rocket, forward motion is achieved due to:

• A. The reaction force from expelled exhaust gases
• B. Air resistance
• C. Gravitational pull only
• D. Magnetic force only

24. The coefficient of friction between two surfaces depends primarily on:

• A. The nature of the two surfaces in contact
• B. The mass of the object alone
• C. The velocity of the object
• D. The colour of the surfaces

25. If a net external force acts on a body, according to Newton's Second Law, the body experiences:

• A. An acceleration in the direction of the net force
• B. No change in motion
• C. A constant velocity only
• D. Only a change in mass

26. Banking of roads at curves is done primarily to:

• A. Provide the necessary centripetal force for vehicles to turn safely
• B. Reduce the weight of vehicles
• C. Increase friction unnecessarily
• D. Decrease the speed limit

27. According to the law of conservation of momentum, in a collision between two isolated bodies, the total momentum before collision is:

• A. Equal to the total momentum after collision
• B. Always greater after collision
• C. Always less after collision
• D. Completely lost after collision

28. A force of 10 N acting on a mass of 2 kg produces an acceleration of:

• A. 5 m/s²
• B. 20 m/s²
• C. 0.2 m/s²
• D. 12 m/s²

29. The apparent weight of a person in a lift accelerating upward is:

• A. Greater than their actual weight
• B. Less than their actual weight
• C. Equal to zero
• D. Unrelated to acceleration

30. If two objects of different masses experience the same force, the object with smaller mass will have:

• A. Greater acceleration
• B. Smaller acceleration
• C. Equal acceleration
• D. Zero acceleration