physics : class11 Right-Hand Rule : Moment of a Force : Motion of System of Particles and Rigid Body MCQ Questions and Answers
Practice important
Right-Hand Rule
MCQ questions and answers.
Page 1
of
1
|
10
MCQ Questions
1. According to the right-hand rule, how is the direction of the moment of a force determined?
A.
Point the fingers along the force and curl them toward the position vector
B.
Curl the fingers from the position vector toward the force, with the thumb giving the moment direction
C.
Point the thumb along the force and fingers along the position vector
D.
Point the palm in the direction of the moment
Correct Answer:
Curl the fingers from the position vector toward the force, with the thumb giving the moment direction
Explanation:
For the moment vector, the right-hand rule requires the fingers to curl from the position vector toward the force vector. The extended thumb then points in the direction of the moment.
2. A force produces a counterclockwise rotation in the plane of a paper. According to the right-hand rule, the moment is directed:
A.
Into the paper
B.
To the left of the paper
C.
Out of the paper
D.
Toward the bottom of the paper
Correct Answer:
Out of the paper
Explanation:
Curl the fingers of the right hand in the counterclockwise direction. The thumb points out of the paper, so the moment is directed outward.
3. A force produces a clockwise rotation in the plane of a paper. What is the direction of its moment according to the right-hand rule?
A.
Out of the paper
B.
Into the paper
C.
Toward the top of the paper
D.
Toward the right side of the paper
Correct Answer:
Into the paper
Explanation:
When the right-hand fingers curl clockwise, the thumb points into the paper. Therefore, the moment direction is into the paper.
4. If the thumb of the right hand points upward, in which direction do the curled fingers indicate the rotation?
A.
Clockwise when viewed from above
B.
Counterclockwise when viewed from above
C.
Straight downward
D.
Along the horizontal direction
Correct Answer:
Counterclockwise when viewed from above
Explanation:
With the right thumb pointing upward, the curled fingers show a counterclockwise sense of rotation when viewed from above the thumb.
5. A moment vector points out of the page. What sense of rotation does the right-hand rule indicate?
A.
Clockwise
B.
Counterclockwise
C.
No rotation
D.
Alternating clockwise and counterclockwise
Correct Answer:
Counterclockwise
Explanation:
If the right thumb points out of the page, the curled fingers move counterclockwise. Thus, an outward moment represents counterclockwise rotation.
6. A moment vector points into the page. What sense of rotation does the right-hand rule indicate?
A.
Counterclockwise
B.
Clockwise
C.
No rotational sense
D.
Upward rotation
Correct Answer:
Clockwise
Explanation:
Pointing the right thumb into the page makes the fingers curl clockwise. Therefore, the moment corresponds to clockwise rotation.
7. When applying the right-hand rule to a moment, the thumb represents the:
A.
Direction of the applied force only
B.
Direction of the position vector only
C.
Direction of the moment vector
D.
Magnitude of the force
Correct Answer:
Direction of the moment vector
Explanation:
In the right-hand rule, the curled fingers show the rotational sense, while the thumb points in the direction of the moment vector.
8. For a force acting in the plane of a page, the moment direction is perpendicular to the page. Which right-hand-rule direction represents a counterclockwise moment?
A.
Thumb pointing into the page
B.
Thumb pointing out of the page
C.
Fingers pointing away from the page
D.
Palm pointing into the page
Correct Answer:
Thumb pointing out of the page
Explanation:
Curling the right-hand fingers counterclockwise causes the thumb to point out of the page, which is the moment direction.
9. If the fingers of the right hand curl in the direction of a body's rotation, what does the thumb show?
A.
The direction of angular displacement only
B.
The direction of the moment or torque vector
C.
The direction of the body's weight
D.
The direction of linear speed
Correct Answer:
The direction of the moment or torque vector
Explanation:
The right-hand rule connects rotational sense with the moment vector: curled fingers follow the rotation and the thumb gives the moment direction.
10. A wheel rotates counterclockwise when viewed from the front. Using the right-hand rule, the direction of its moment vector is:
A.
Toward the viewer
B.
Away from the viewer
C.
Vertically downward in the wheel's plane
D.
Horizontally to the right in the wheel's plane
Correct Answer:
Toward the viewer
Explanation:
When viewed from the front, counterclockwise rotation makes the right-hand fingers curl counterclockwise. The thumb points toward the viewer, giving the moment direction.
Short Questions and Answers
Practice short questions and answers related to
Right-Hand Rule
.
Short questions are currently unavailable for this page.