Motion Test

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Motion Test - 9

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Weekly Quiz Competition

Question 1
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Which of the following is correct about uniform circular motion?
A) Direction of motion is continuously changed.
B) Direction of motion is not changed.
C) Speed and direction both remain constant.
D) Speed is constant, but direction is changing.

A
(A) and (D) are correct

B
(B) and (C) are correct

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

D
All of these

Solution

In uniform circular motion the direction of the body continuosly changes and hence the velocity (speed) of the body also changes.
Question 2
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Which of the quantities – speed, time, velocity and acceleration have the same SI unit?

A
velocity, time

B
velocity, acceleration

C
Acceleration, time.

D
speed, velocity

Solution

SI unit of both speed and velocity is m/s. Although velocity is a vector quantity but speed is a scalar quantity.
Question 3
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Find the correct statement

A
Displacement is a scalar quantity

B
Velocity has magnitude only

C
The SI unit of retardation is −ms⁻²

D
The motion of the athletes is uniform

Solution

If there is decrease in acceleration, it is called Retardation. This means, rate of decrease in velocity is called Retardation. The negative acceleration is termed retardation or deceleration.

SI unit of acceleration (a) is m/s² or ms^–2
So Unit of retardation is –ms^–2
Question 4
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A body is said to be in rest when

A
Body moves in uniform motion w.r.t observer

B
It's position changes with time w.r.t observer.

C
It's position doesn’t change with time with respect to the observer.

D
None of these.

Solution

When a body does not change its position with respect to time, it is said that body is in state of rest. Rest and motion are relative to observer.
Question 5
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A person sitting in the truck projected a ball vertically upwards. The ball

A
falls back in his hand

B
falls outside the car

C
falls in front of the car.

D
falls by the side of car

Solution

A person sitting in the truck projected a ball vertically upwards. The ball will fall back in his hand as the ball and the truck are moving with same speed.
Question 6
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Find the incorrect statement

A
The body is said to be accelerating if it moves in a uniform circular motion

B
The slope of velocity-time graph gives instantaneous acceleration

C
When a body moves with constant speed its acceleration is zero

D
None of these.

Solution

When a body moves with constant speed its acceleration is not acting. The body is said to be accelerating if it moves in a uniform circular motion. The slope of velocity-time graph gives instantaneous acceleration.
Question 7
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Match the following with correct response.
(1) Scalar
(2) Vector
(3) Rectilinear motion
(4) Circular motion

(A) Magnitude and direction
(B) Motion of satellite
(C) Non-uniform
(D) Magnitude

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

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

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

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

Solution

Scalar- A physical quantity having only magnitude is known as a scalar quantity. A scalar quantity has no direction.

Vector- A physical quantity having a magnitude as well as direction is known as vector quantity.

Circular motion -Motion about a fixed point called as centre. In other words,motion in a circle is circular motion.

Rectilinear motion- Rectilinear motion is another name for straight-line motion. This type of motion describes the movement of a particle or a body.
Question 8
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Match the following with correct response.

Column A Column B

(1) Velocity (A) m/s²

(2) Displacement (B)m/s

(3) Acceleration (C) −m/s²

(4) Retardation (D) m

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

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

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

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

Solution

(1) The SI unit of velocity is meter per second.
(2) The SI unit of acceleration is the metre per second square.
(3) The SI unit of displacement is the meter.
(4) Retardation is negative acceleration.Therefore its SI unit is metre per second squared with a negative sign.
Question 9
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Match the following with correct response.
(1) Uniform acceleration
(2) Measurement of distance
(3) Energy
(4) Acceleration

(A) Vector quantity
(B) Odometer
(C) Velocity increases in equal intervals of time
(D) Scalar quantity

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

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

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

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

Solution

Vector- A physical quantity having a magnitude as well as direction is known as vector quantity.
Odometer- an instrument for measuring the distance travelled by a wheeled vehicle.

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

Scalar- A physical quantity having only magnitude is known as a scalar quantity.

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Column A	Column B
(1) Velocity	(A) m/s²
(2) Displacement	(B)m/s
(3) Acceleration	(C) −m/s²
(4) Retardation	(D) m

Motion Test - 9

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Motion Test - 9

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Question 1

(A) and (D) are correct

(B) and (C) are correct

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

All of these

Solution

Question 2

velocity, time

velocity, acceleration

Acceleration, time.

speed, velocity

Solution

Question 3

Displacement is a scalar quantity

Velocity has magnitude only

The SI unit of retardation is −ms−2

The motion of the athletes is uniform

Solution

Question 4

Body moves in uniform motion w.r.t observer

It's position changes with time w.r.t observer.

It's position doesn’t change with time with respect to the observer.

None of these.

Solution

Question 5

falls back in his hand

falls outside the car

falls in front of the car.

falls by the side of car

Solution

Question 6

The body is said to be accelerating if it moves in a uniform circular motion

The slope of velocity-time graph gives instantaneous acceleration

When a body moves with constant speed its acceleration is zero

None of these.

Solution

Question 7

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

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

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

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

Solution

Question 8

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

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

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

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

Solution

Question 9

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

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

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

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

Solution

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The SI unit of retardation is −ms⁻²