Mechanics CDS Questions

CDS Physics

Mechanics MCQ Questions


13.
On a velocity-time (v-t) graph, the slope (gradient) of the line at any point represents:
A.
The total distance travelled by the object
B.
The mass of the object
C.
The instantaneous acceleration of the object at that point
D.
The average velocity over the entire time interval
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ANSWER :
C. The instantaneous acceleration of the object at that point
14.
A particle's average speed is generally defined as:
A.
Total displacement divided by total time taken
B.
The instantaneous speed at the midpoint of the journey
C.
Total distance travelled divided by total time taken
D.
Half the sum of initial and final velocities, regardless of the path taken
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ANSWER :
C. Total distance travelled divided by total time taken
15.
A body is said to be in 'uniform motion' along a straight line when it:
A.
Has zero velocity at all times
B.
Covers equal distances in equal intervals of time, implying zero acceleration
C.
Covers unequal distances in equal intervals of time
D.
Has constantly changing direction
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ANSWER :
B. Covers equal distances in equal intervals of time, implying zero acceleration
16.
Newton's First Law of Motion, also known as the Law of Inertia, states that:
A.
Force equals the product of mass and acceleration
B.
A body continues in its state of rest or uniform motion in a straight line unless acted upon by a net external force
C.
Momentum is always conserved regardless of external forces
D.
Every action has an equal and opposite reaction
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ANSWER :
B. A body continues in its state of rest or uniform motion in a straight line unless acted upon by a net external force
17.
Newton's Second Law of Motion is mathematically expressed as F = ma, where the rate of change of momentum of a body is:
A.
Always inversely proportional to the applied force
B.
Directly proportional to the net external force applied, and occurs in the direction of that force
C.
Independent of the mass of the body
D.
Equal to zero under all circumstances
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ANSWER :
B. Directly proportional to the net external force applied, and occurs in the direction of that force
18.
Newton's Third Law of Motion states that:
A.
For every action, there is an equal and opposite reaction
B.
Mass and weight are always numerically equal
C.
Force is directly proportional to acceleration
D.
An object at rest will remain at rest unless acted upon
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ANSWER :
A. For every action, there is an equal and opposite reaction