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Class 9 Science
Motion
Quiz 1
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A particle is moving in a circular path of radius r. The displacement after half a circle would be:
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Zero
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πr
0%
2r
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2πr
Explanation
2r
The numerical ratio of displacement to distance for a moving object is
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always less than 1
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always equal to 1
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always more than 1
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equal or less than 1
Explanation
equal or less than 1
If the displacement of an object is proportional to square of time, then the object moves with
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uniform velocity
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uniform acceleration
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increasing acceleration
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decreasing acceleration
Explanation
uniform acceleration
From the given υ – t graph, it can be inferred that the object is
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in uniform motion
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at rest
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in non-uniform motion
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moving with uniform acceleration
Explanation
in uniform motion
Suppose a boy is enjoying a ride on a merry-go-round which is moving with a constant speed of 10 ms
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at rest
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moving with no acceleration
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in accelerated motion
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moving with uniform velocity
Explanation
in accelerated motion
Area under a υ -1 graph represents a physical quantity which has the unit
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m
2
0%
m
0%
m
3
0%
ms
-1
Explanation
m
Four cars A, B, C and D are moving on a levelled road. Their distance versus time graphs are shown in the adjacent figure. Choose the correct statement.
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Car A is faster than car D.
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Car B is the slowest.
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Car D is faster than car C.
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Car C is the slowest.
Explanation
Car B is the slowest.
Slope of a velocity-time graph gives
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the distance
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the displacement
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the acceleration
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the speed
Explanation
the acceleration
In which of the following cases of motions, the distance moved and the magnitude of displacement are equal?
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If the car is moving on a straight road
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If the car is moving in Circular path
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The pendulum is moving to and fro
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The earth is revolving around the sun.
Explanation
If the car is moving on a straight road
A boy goes from A to B with a velocity of 20 m/min and comes back from B to A with a velocity of 30 m/min. The average velocity of the boy during the whole journey is
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24 m/min
0%
25 m/s
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Zero
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20 m/min
Explanation
24 m/min
Velocity-time graph of an object is given below. The object has
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Uniform velocity
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Uniform speed
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Uniform retardation
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Variable acceleration
Explanation
Uniform retardation
A body is projected vertically upward from the ground. Taking vertical upward direction as positive and point of projection as origin, the sign of displacement of the body from the origin when it is at height h during upward and downward journey will be
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Positive, positive
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Positive, negative
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Negative, negative
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Negative, positive
Explanation
Positive, positive
According to the given velocity-time graph, the object
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is moving with uniform velocity
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has some initial velocity
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is moving uniformly with some initial velocity
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is at rest
Explanation
has some initial velocity
The ratio of speed to the magnitude of velocity when the body is moving in one direction is
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Less than one
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Greater than one
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Equal to one
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Greater than or equal to one
Explanation
Equal to one
Which of the following situations is possible?
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An object can have acceleration, but constant velocity.
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The velocity of an object may be zero but acceleration is not zero.
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Distance and the magnitude of displacement are equal in circular motion.
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Average speed and the magnitude of average velocity are always equal in circular motion.
Explanation
The velocity of an object may be zero but acceleration is not zero.
On a graph showing distance versus time, a horizontal line represents an object that is
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a. Decreasing its speed
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b. Moving at a constant speed
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c. not moving at all
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d. Increasing its speed
In an acceleration graph showing speed versus time, a straight line shows the acceleration is
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a. Decreasing
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b. Increasing
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c. changing
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d. constant
If a particle covers equal distances in equal time intervals, it is said to
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a. move with a uniform speed
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b. be at rest
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c. move with a uniform velocity
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d. move with a uniform acceleration
When you know both the speed and direction of an object's motion, you know the
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a. acceleration of the object
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b. velocity of the object
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c. the average speed of the object
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d. distance traveled by the object
A particle moves with a uniform velocity.
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a. The particle must be at rest.
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b. the particle moves along a straight line.
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c. the particle moves along a circle.
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d. The particle moves along a curved path.
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