Motion in 2D Quiz - CBSE Class 12 Physics

Free practice quiz: Motion in 2D (CBSE Class 12 Physics). 20 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This CBSE Class 12 Physics practice quiz has 20 multiple-choice questions on Motion in 2D, and 20 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. What is the resultant of two vectors of equal magnitude acting at right angles to each other?

   1. Equal to the sum of the magnitudes
   2. Equal to the difference of the magnitudes
   3. Equal to the square root of the sum of the squares of the magnitudes
   4. Zero
   Show answer

   Answer: C. Equal to the square root of the sum of the squares of the magnitudes

   When two vectors of equal magnitude act at right angles, the resultant vector can be found using the Pythagorean theorem. If the magnitude of each vector is 'A', then the resultant R = √(A² + A²) = A√2.

2. A car moves in a circular track with constant speed. What can be said about its velocity?

   1. It is constant
   2. It is changing
   3. It is zero
   4. It is equal to the acceleration
   Show answer

   Answer: B. It is changing

   Even though the speed of the car is constant, its direction is continuously changing as it moves along the circular path. Therefore, the velocity, which includes direction, is changing.

3. An object is projected upward at a velocity of 15 m/s. What will be its maximum height? (g = 9.8 m/s²)

   1. 11.47 m
   2. 22.5 m
   3. 25.77 m
   4. 15.3 m
   Show answer

   Answer: A. 11.47 m

   The maximum height can be found using the equation h = (v^2) / (2g). Here, h = (15 m/s)² / (2 * 9.8 m/s²) = 225 / 19.6 = 11.47 m.

4. A ball thrown upward will reach maximum height and then fall back. What is the vertical speed at the maximum height?

   1. Negative
   2. Zero
   3. Positive
   4. Depends on the initial speed
   Show answer

   Answer: B. Zero

   At maximum height, the vertical component of the speed becomes zero before the object starts to descend due to gravity.

5. A ball is dropped from a height. After 2 seconds, what will be its speed? (g = 9.8 m/s²)

   1. 19.6 m/s
   2. 9.8 m/s
   3. 0 m/s
   4. 39.2 m/s
   Show answer

   Answer: A. 19.6 m/s

   The speed of the ball after falling for a time t can be calculated using v = g*t. Here, v = 9.8 m/s² * 2 s = 19.6 m/s.

More questions in this quiz

Answers and explanations are in the full quiz.

1. Which of the following represents the horizontal component of a projectile's motion?
2. If a stone is thrown horizontally from the top of a cliff, which of the following statements is true about its motion?
3. What does the term 'range' refer to in projectile motion?
4. What is the significance of the angle of projection in projectile motion?
5. A ball is thrown at an angle of 30 degrees with the horizontal. What is the vertical component of its velocity, if its initial velocity is 20 m/s?
6. Which of the following is NOT a characteristic of projectile motion?
7. A projectile is thrown with an initial speed of 30 m/s at an angle of 45 degrees. What is the time of flight? (g = 9.8 m/s²)
8. What happens to the horizontal range if the angle of projection is increased beyond 45 degrees?
9. What describes the path of an object in projectile motion?
10. If a projectile is launched with an initial speed of 40 m/s at an angle of 60 degrees, what is its horizontal range? (g = 9.8 m/s²)
11. A car travels in a circle of radius 100 m at a constant speed of 40 m/s. What is the centripetal acceleration?
12. Which factor does NOT affect the time of flight of a projectile?
13. Which of the following is true about the trajectory of a projectile?
14. What is the acceleration of an object in uniform circular motion?
15. For maximum range in projectile motion, what angle should the projectile be launched?

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