physics : class11 Gravitational Force as a Vector : Gravitational Force : Gravitation MCQ Questions and Answers
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Gravitational Force as a Vector
MCQ questions and answers.
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MCQ Questions
1. The gravitational force exerted by one mass on another mass is directed along which line?
A.
A line perpendicular to the line joining their centers
B.
The line joining the centers of the two masses
C.
A circular path around the two masses
D.
A random direction
Correct Answer:
The line joining the centers of the two masses
Explanation:
Gravitational force is a vector directed along the straight line joining the centers of the two interacting masses.
2. What is the direction of the gravitational force exerted by Earth on an object near its surface?
A.
Vertically upward
B.
Horizontally outward
C.
Toward the center of Earth
D.
Away from the center of Earth
Correct Answer:
Toward the center of Earth
Explanation:
The gravitational force is attractive, so Earth pulls the object toward Earth's center.
3. Two objects attract each other gravitationally. If object A pulls object B toward the right, in which direction does object B pull object A?
A.
Toward the right
B.
Toward the left
C.
Vertically upward
D.
There is no force on object A
Correct Answer:
Toward the left
Explanation:
The two gravitational forces are equal in magnitude and opposite in direction, acting along the line joining the objects.
4. Which statement correctly describes gravitational force as a vector quantity?
A.
It has magnitude only
B.
It has direction only
C.
It has both magnitude and direction
D.
It has neither magnitude nor direction
Correct Answer:
It has both magnitude and direction
Explanation:
A vector quantity is specified by both magnitude and direction. Gravitational force has a magnitude and acts along the line joining two masses.
5. Two equal masses are placed symmetrically on opposite sides of a third mass. What is the net gravitational force on the third mass?
A.
Maximum toward the left
B.
Maximum toward the right
C.
Zero
D.
Directed vertically upward
Correct Answer:
Zero
Explanation:
The two gravitational forces on the central mass have equal magnitudes and opposite directions, so their vector sum is zero.
6. If two gravitational forces acting on an object are in the same direction, how is their resultant force found?
A.
By adding their magnitudes
B.
By subtracting their magnitudes
C.
By dividing their magnitudes
D.
It is always zero
Correct Answer:
By adding their magnitudes
Explanation:
Vectors pointing in the same direction add directly, so the resultant gravitational force equals the sum of their magnitudes in that direction.
7. If two equal gravitational forces act on an object in opposite directions, what is their resultant?
A.
Equal to one of the forces
B.
Twice one of the forces
C.
Zero
D.
Perpendicular to both forces
Correct Answer:
Zero
Explanation:
Equal vectors in opposite directions cancel each other, giving a zero resultant gravitational force.
8. A mass is attracted gravitationally by two nearby objects. The net gravitational force on it is found by:
A.
Ignoring the directions of the forces
B.
Adding the forces as vectors
C.
Multiplying the force directions
D.
Using only the smaller force
Correct Answer:
Adding the forces as vectors
Explanation:
When more than one gravitational force acts, the net force is the vector sum of all the individual gravitational forces.
9. At the midpoint between two identical masses, the gravitational forces due to the two masses are:
A.
Equal in magnitude and opposite in direction
B.
Unequal and in the same direction
C.
Equal in magnitude and in the same direction
D.
Zero individually
Correct Answer:
Equal in magnitude and opposite in direction
Explanation:
At the midpoint, the distances from the two identical masses are equal, so the forces have equal magnitudes and point toward opposite masses.
10. The gravitational force vector on a mass placed to the right of a single massive body points:
A.
To the right, away from the massive body
B.
To the left, toward the massive body
C.
Vertically upward
D.
Perpendicular to the line joining the masses
Correct Answer:
To the left, toward the massive body
Explanation:
Gravitational force is attractive, so the mass is pulled toward the massive body along the line joining their centers.
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