MOTION
1.
The area under velocity - time graph represents the
(a)
velocity of the moving object.
(b)
displacement covered by the moving object.
(c)
speed of the moving object.
(d)
acceleration of the moving object.
[Answer: (b) displacement covered by the moving object]
2.
Which one of the following is most likely not a case of uniform circular
motion?
(a)
Motion of the Earth around the Sun.
(b)
Motion of a toy train on a circular track.
(c)
Motion of a racing car on a circular track.
(d)
Motion of hours’ hand on the dial of the clock.
[Answer: (c) Motion of a racing car on a circular track]
3.
Which of the following graph represents uniform motion of a moving particle?
[Answer: (b) ]
4.
The centrifugal force is
(a)
a real force.
(b)
the force of reaction of centripetal force.
(c)
a virtual force.
(d)
directed towards the centre of the circular path.
[Answer: (c) a virtual force]
1.
Speed
is a Scalar quantity whereas velocity is a Vector quantity.
2.
The
slope of the distance - time graph at any point gives Speed .
3. Negative
acceleration is called retardation (or)
deceleration.
4. Area
under velocity - time graph shows displacement
.
1. The
motion of a city bus in a heavy traffic road is an example for uniform motion.
Answer: False.
Correct statement: The motion of a city bus in a
heavy traffic road is an example for non-uniform
motion.
2.
Acceleration
can get negative value also.
Answer: True.
3. Distance
covered by a particle never becomes zero but displacement becomes zero.
Answer: True.
4. The
velocity - time graph of a particle falling freely under gravity would be a
straight line parallel to the x axis.
Answer: False.
Correct statement : The velocity - time graph of a
particle moving at uniform velocity,
would be straight line parallel to the x axis.
5. If the
velocity - time graph of a particle is a straight line inclined to X-axis then
its displacement - time graph will be a straight line.
Answer: True.
Mark the correct choice as:
(a)
If both assertion and reason are true and reason is the correct explanation of
assertion.
(b)
If both assertion and reason are true but reason is not the correct explanation
of assertion.
(c)
If assertion is true but reason is false.
(d)
If assertion is false but reason is true.
1. Assertion : The accelerated motion of an
object may be due to change in magnitude of velocity or direction or both of
them..
Reason : Acceleration can be produced only by change
in magnitude of the velocity. It does not depend the direction.
(a)
If both assertion and reason are true and reason is the correct explanation of
assertion.
(b)
If both assertion and reason are true but reason is not the correct explanation
of assertion.
(c) If assertion is true but
reason is false.
(d)
If assertion is false but reason is true.
[Answer: (c) If assertion
is true but reason is false.]
2. Assertion : The Speedometer of a car or a
motor-cycle measures its average speed. Reason :
Average velocity is equal to total displacement divided by total time taken.
(a)
If both assertion and reason are true and reason is the correct explanation of
assertion.
(b)
If both assertion and reason are true but reason is not the correct explanation
of assertion.
(c)
If assertion is true but reason is false.
(d) If assertion is false but
reason is true.
[Answer: (d) Assertion is
false but reason is true]
3. Assertion : Displacement of a body may be
zero when distance travelled by it is not zero.
Reason : The displacement is the shortest distance
between initial and final position.
(a) If both assertion and reason
are true and reason is the correct explanation of assertion.
(b)
If both assertion and reason are true but reason is not the correct explanation
of assertion.
(c)
If assertion is true but reason is false.
(d)
If assertion is false but reason is true.
[Answer: (a) Both
assertion and reason are true and reason is the correct explanation of
assertion]
List I
1. Motion
of a body covering equal distances in equal intervals of time
2. Motion
with non uniform acceleration
3.
Constant
retardation
4. Uniform acceleration
Answer:
List I - List II
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