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9th Grade > Physics

DYNAMICS PHYSICS MCQs

Total Questions : 87 | Page 3 of 9 pages
Question 21. If the bullet of mass 20 g is fired from a gun of 5 kg with a velocity of 100 ms-1 then recoil of the gun is
  1.    0.4 ms-1
  2.    -0.4 ms-1
  3.    1 ms-1
  4.    2 ms-1
 Discuss Question
Answer: Option B. -> -0.4 ms-1
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 22. The branch of mechanics that deals with the study of the motion of an object and the cause of its motion are called
  1.    kinematics
  2.    dynamics
  3.    trinamics
  4.    friction
 Discuss Question
Answer: Option A. -> kinematics
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 23. Two masses 7.5 kg and 6.7 kg are attached to the ends of an inextensible string passes over a frictionless pulley. Its tension when both masses are moving vertically will be equal to
  1.    50 N
  2.    70.7 N
  3.    65.6 N
  4.    45 N
 Discuss Question
Answer: Option B. -> 70.7 N
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 24. A cyclist keeps on pedaling to overcome
  1.    velocity
  2.    inertia
  3.    position
  4.    friction
 Discuss Question
Answer: Option D. -> friction
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 25. The force needed to prevent a body of mass 13 kg from falling will be
  1.    130 N
  2.    110 N
  3.    100 N
  4.    120 N
 Discuss Question
Answer: Option A. -> 130 N
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 26. The force that keeps the objects in a circular path is called
  1.    centrifugal force
  2.    frictional force
  3.    centripetal force
  4.    inertia
 Discuss Question
Answer: Option C. -> centripetal force
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 27. The property due to which a body resists the change in its state is called
  1.    inertia
  2.    friction
  3.    force
  4.    velocity
 Discuss Question
Answer: Option A. -> inertia
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 28. Mass does not change with the change of place so it is a
  1.    vector quantity
  2.    scalar quantity
  3.    fixed quantity
  4.    variable quantity
 Discuss Question
Answer: Option B. -> scalar quantity
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 29. A brick of mass 100 g is attached to a rope 1m long. The brick is rotating in a circle with 5ms−1 speed. The tension in the rope will be
  1.    3 N
  2.    2.5 N
  3.    4 N
  4.    1.5 N
 Discuss Question
Answer: Option B. -> 2.5 N
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 30. The quantity of motion that the body possesses due to its mass and velocity is known as
  1.    inertia
  2.    momentum
  3.    force
  4.    friction
 Discuss Question
Answer: Option B. -> momentum
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

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