Motion Test

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Motion Test - 11

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Weekly Quiz Competition

Question 1
1 / -0

Match the following with correct response.
(1) Rate of change of velocity
(2) Rate of change of displacement
(3) Rate of change of distance
(4) Rate of change of speed in circular path

(A) Uniform circular motion
(B) Velocity
(C) Acceleration
(D) Speed

A
1-B, 2-D, 3-A, 4-C

B
1-D, 2-A, 3-C, 4-B

C
1-C, 2-B, 3-D, 4-A

D
1-A, 2-C, 3-B, 4-D

Solution

Acceleration of a body is defined as the rate of change of its velocity with time.

Velocity of a body is defined as the rate of change of its displacement with time.

Speed of a body is the distance travelled by it per unit time.

When a body moves along a circular path,then its direction of motion keeps changing continuously.Therefore,the motion along a circular path is said to be accelerated.
Question 2
1 / -0

Match the following with correct response.
(1) Graph showing uniform velocity
(2) Graph showing uniformly accelerated velocity
(3) Graph showing uniformly retarded
(4) Graph showing non-uniform motion

(A) Straight line sloping upwards
(B) Curved line
(C) Straight line sloping downwards
(D) Straight line parallel to x-axis

A
1-C, 2-B, 3-D, 4-A

B
1-A, 2-C, 3-B, 4-D

C
1-D, 2-A, 3-C, 4-B

D
1-B, 2-D, 3-A, 4-C

Solution

(1) The slope of a Velocity – time graph of an object moving in rectilinear motion with uniform velocity is straight line and parallel to x-axis when velocity is taken along y-axis and time is taken along x-axis.
(2) Graph showing uniformly accelerated velocity then straight line sloping upwards.
(3) In the velocity –time graph of a body moving with uniform retardation is a straight line sloping downwards.
(4) If an object is travelling at a variable angular speed around a fixed axis or center point, then the motion of that object will be defined as the uniform circular motion. In this case the object travels around a curved path and it will have some radial acceleration due to which its velocity would change direction every second.
Question 3
1 / -0

Which of the following statement is correct?
A) When a body starts from rest, u = 0
B)When a body comes to rest, v = 0
C) For a body under free fall, a=−9.8m/s²
D)For uniform velocity, a = 0

A
(A) and (B) are correct

B
(B) and (C) are correct

C
(A), (B) and (D) are correct

D
All of these

Solution

A body starting from rest and when it comes to rest has velocity equal to zero.

A body moving with uniform velocity has zero acceleration since there is no change in velocity.

A body under free fall has an acceleration of 9.8 ms^-2
Question 4
1 / -0

The slope of distance-time graph gives instantaneous-

A
acceleration

B
velocity

C
speed

D
distance covered.

Solution

The slope of a distance-time graph gives instantaneous speed of the moving object. Instantaneous speed can be more or less than average speed.
Question 5
1 / -0

Distance is a _______ quantity.

A
Dimensionless

B
Unit vector

C
Scalar

D
Vector

Solution

Those physical quantities that possess only magnitude are called scalar quantities. Distance is a scalar quantity, since direction is not required to represent distance. It is the total length of the actual path covered by a body.
Question 6
1 / -0

‘A body can be at rest and in motion at the same time’.

The above statement is-

A
True

B
False

C
Partially true

D
Partially false.

Solution

An object which is at rest can also be in motion with respect to different reference points. For example a passenger travelling in a bus the passenger is at rest with respect to the fellow passengers but it is in motion with respect to the bus.
Question 7
1 / -0

A body is moving with a velocity of 10m/s. If the motion is uniform, what will be the velocity after 10 second?

A
5 m/s

B
10 m/s

C
15 m/s.

D
20 m/s

Solution

A body moving with uniform motion, never changes it speed. So, the velocity of the body remain same after 10 second that is 10m/s.
Question 8
1 / -0

Distance can never be ____________ for a moving body.

A
Negative or zero

B
Positive

C
Negative

D
Zero

Solution

The actual length of the path travelled by a moving body in a given interval of time is called the distance travelled by the body. It is a scalar quantity and its value never be zero or negative.

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Re-Attempt Weekly Quiz Competition

Motion Test - 11

Result

Motion Test - 11

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Question 1

1-B, 2-D, 3-A, 4-C

1-D, 2-A, 3-C, 4-B

1-C, 2-B, 3-D, 4-A

1-A, 2-C, 3-B, 4-D

Solution

Question 2

1-C, 2-B, 3-D, 4-A

1-A, 2-C, 3-B, 4-D

1-D, 2-A, 3-C, 4-B

1-B, 2-D, 3-A, 4-C

Solution

Question 3

(A) and (B) are correct

(B) and (C) are correct

(A), (B) and (D) are correct

All of these

Solution

Question 4

acceleration

velocity

speed

distance covered.

Solution

Question 5

Dimensionless

Unit vector

Scalar

Vector

Solution

Question 6

True

False

Partially true

Partially false.

Solution

Question 7

5 m/s

10 m/s

15 m/s.

20 m/s

Solution

Question 8

Negative or zero

Positive

Negative

Zero

Solution

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