Lakshya Education MCQs

Question: A particle is dropped from a height of 3 m on a horizontal floor, which has a coefficient of restitution with the ball of 1/2. the height to which the ball will rebound after striking the floor is
Options:
A. 0.5 m
B. 0.75 m
C. 1.0 m
D. 1.5 m
Answer: Option B

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Question 1. A glass ball is shot to hit a wall from a point on a smooth floor. if the ball returns back to the point of projection in twice the time taken in reaching the wall, the coefficient of restitution between the glass ball and the wall is
  1.     0.25
  2.     0.33
  3.     0.40
  4.     0.50
Answer: Option D
Question 2. A particle of mass 2 kg executes simple harmonic motion of frequency 6/71 hz and amplitude 0.25 m. its maximum kinetic energy is
  1.     4.5 J
  2.     9.0 J
  3.     12.0 J
  4.     18.0 J
Answer: Option B
Question 3. A particle is dropped from a height of 3 m on a horizontal floor, which has a coefficient of restitution with the ball of 1/2. the height to which the ball will rebound after striking the floor is
  1.     0.5 m
  2.     0.75 m
  3.     1.0 m
  4.     1.5 m
Answer: Option B
Question 4. If the angle between the applied force and the direction of motion of a body, is between 90° and 180°, the work done, is called
  1.     Virtual work
  2.     Imaginary work
  3.     Zero work
  4.     Negative work
Answer: Option D
Question 5. If the velocity of projection is 4 m/sec and the angle of projection is α°, the maximum height of the projectile from a horizontal plane, is
  1.     u² cos² α/2g
  2.     u² sin² α/2g
  3.     u² tan² α/2g
  4.     u² sin 2α/2g
Answer: Option B
Question 6. When a body moves round a fixed axis, it has
  1.     A rotary motion
  2.     A circular motion
  3.     A translatory
  4.     A rotary motion and translatory motion
Answer: Option B

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