Force and Laws of Motion Quiz - CBSE Class 11 Science

Free practice quiz: Force and Laws of Motion (CBSE Class 11 Science). 19 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This CBSE Class 11 Science practice quiz has 19 multiple-choice questions on Force and Laws of Motion, and 19 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. A body at rest will remain at rest unless acted upon by an external force. This statement describes:

   1. Newton's Second Law of Motion
   2. Newton's Third Law of Motion
   3. Newton's First Law of Motion
   4. Law of Conservation of Energy
   Show answer

   Answer: C. Newton's First Law of Motion

   This is a direct statement of Newton's First Law of Motion, also known as the law of inertia.

2. A 10 kg mass experiences a force of 20 N. What is its acceleration?

   1. 0.5 m/s²
   2. 2 m/s²
   3. 200 m/s²
   4. 5 m/s²
   Show answer

   Answer: B. 2 m/s²

   Using Newton's Second Law (F=ma), acceleration (a) = F/m = 20 N / 10 kg = 2 m/s²

3. Calculate the momentum of a 5 kg object moving at 10 m/s.

   1. 50 kg m/s
   2. 2 kg m/s
   3. 0.5 kg m/s
   4. 500 kg m/s
   Show answer

   Answer: A. 50 kg m/s

   Momentum (p) = mass (m) x velocity (v) = 5 kg x 10 m/s = 50 kg m/s

4. A projectile is launched at an angle. Ignoring air resistance, what is the horizontal component of its acceleration?

   1. 9.8 m/s² downwards
   2. 0 m/s²
   3. 9.8 m/s² upwards
   4. It depends on the launch angle
   Show answer

   Answer: B. 0 m/s²

   Gravity acts vertically. There is no horizontal acceleration if air resistance is ignored.

5. Explain the concept of impulse and its relationship to momentum.

   1. Impulse is the change in momentum
   2. Impulse is the rate of change of momentum
   3. Impulse is the product of force and time
   4. Impulse is equal to kinetic energy
   Show answer

   Answer: A. Impulse is the change in momentum

   Impulse is defined as the change in momentum of an object. It is also equal to the product of force and the time interval over which the force acts.

More questions in this quiz

Answers and explanations are in the full quiz.

1. What is the SI unit of force?
2. If an object is moving at a constant velocity, what is the net force acting on it?
3. Explain the concept of inertia.
4. A rocket moves forward by expelling hot gases backward. This is an example of:
5. A heavier object and a lighter object are dropped from the same height in a vacuum. Which will hit the ground first?
6. A car's brakes are applied, causing it to decelerate. What force is responsible for this deceleration?
7. Two objects of equal mass collide. If one object is initially at rest, what can be said about the total momentum after the collision?
8. Explain the difference between mass and weight.
9. Describe how Newton's Third Law relates to walking.
10. A 2 kg ball is thrown upwards with an initial velocity of 15 m/s. What is its kinetic energy at the highest point of its trajectory?
11. Derive the equation for the range of a projectile launched at an angle θ with initial velocity v.
12. A ball is dropped from a height h and bounces back to a height h/2. What happened to the lost energy?
13. Two identical rockets are launched vertically. Rocket A uses all its fuel in 10 seconds, while Rocket B uses the same amount of fuel over 20 seconds. Which rocket achieves a higher final velocity, neglecting air resistance?
14. A block slides down a frictionless inclined plane. Derive an expression for its final velocity at the bottom of the plane in terms of the height of the plane and acceleration due to gravity.

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