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Published on: 26/08/2019
Motion in a Straight Line
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Questions + Answers key
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1.
Position-time graph could have negative slope Is it true or false?
2.
For which condition, the distance and the magnitude of displacement of an object have the same values?
3.
Does the displacement of an object depend on the choice of the postion of origin of the coordinate system?
4.
Can a tumbling beaker that has slipped off the edge of a table considered as a point object?
5.
What is the condition for an object to be considered as a point object?
6.
Identify one dimensional motion out of the following:
A honey bee dancing in air
A teacher writing on a blackboard
A scooterist speeding on a level road
A kite flying in sky.
7.
In case of a moving body
displacement > distance
displacement < distance
displacement ≥ distance
displacement ≤ distance
8.
When the distance travelled by a body is directly proportional to the time, the body is said to have a
zero speed
uniform acceleration
zero velocity
uniform speed
9.
Which of the following is not a vector quantity?
acceleration
velocity
speed
displacement
10.
The displacement x of a particle varies with time according to the relation x=\(\frac { a }{ b } \)(1-e-bt). Then
At t =\(\frac { 1 }{ b } \) , the displacement of the particle is nearly (2/3) (a/b).
The particle cannot reach a point at a distance x from its starting position if x> a/ b.
The velocity and acceleration of the particle at t = 0 are a and - ab respectively.
The particle will come back to its starting point as t ⇾∞.
1.
It is true because if the velocity of the object is negative, then slope of v-t graph is negative.
2.
The distance and the magnitude of displacement of an object have the same values, when the body is moving along a straight line path in a fixed direction.
3.
No, the displacement of the objects does not depend on the choice of the position of the origin.
4.
No, because the size of the beaker is not negligible as compared to the height of the table.
5.
An object can be considered as a point object if the distance travelled by it is very large than its size.
6.
(c)
A scooterist speeding on a level road
7.
(d)
displacement ≤ distance
8.
(d)
uniform speed
9.
(c)
speed
10.
(a)
At t =\(\frac { 1 }{ b } \) , the displacement of the particle is nearly (2/3) (a/b).
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