Motion Test

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Motion Test - 25

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Weekly Quiz Competition

Question 1
1 / -0

Velocity of a moving body reduces when it undergoes

A
acceleration

B
retardation

C
either acceleration or retardation

D
neither acceleration nor retardation

Solution

Retardation means rate of decrease of velocity with time. So, velocity of a body reduces when it undergoes retardation.
Question 2
1 / -0

SI unit of distance is

A
$$m$$

B
$$cm$$

C
$$km$$

D
none of these

Solution

In SI, distance is measured in $$m$$.
$$cm$$ and $$km$$ are respectively cgs and practical units of distance.
Question 3
1 / -0

A body suffers retardation of $$1 m{s}^{-2}$$ means

A
its velocity increases by $$1 m{s}^{-1}$$ per second

B
its velocity remains constant

C
its velocity decreases by $$1 m{s}^{-1}$$ per second

D
none of these

Solution

Acceleration is the rate of change of the velocity of an object with respect to time. Positive acceleration means increase in velocity with time and negative acceleration means decrease in velocity per unit time . Negative acceleration is also called retardation.
So retardation means rate of decrease of velocity per second.
So, retardation of $$1 m{s}^{-2}$$ = decrease of $$1 m{s}^{-1}$$ velocity per second.
Question 4
1 / -0

A body, initially at rest, starts moving with a constant acceleration $$2 m{s}^{-2}$$. Calculate the velocity acquired in 5 s.

A
$$2 m{s}^{-1}$$

B
$$5 m{s}^{-1}$$

C
$$7.5 m{s}^{-1}$$

D
$$10 m{s}^{-1}$$

Solution

Given,
Initial velocity, $$u=0$$

Acceleration, $$a=2ms^{-2}$$

Time, $$t=5s$$

$$v=u+at$$

$$v=0+(2\times 5)=10ms^{-1}$$
Question 5
1 / -0

Which of the following is not an example of a motion with a constant speed but variable velocity?

A
A car moving at $$80 kmph$$ on a straight road

B
A car moving at $$80 kmph$$ on a square track

C
A car moving at $$80 kmph$$ on a circular track

D
A car moving at $$80 kmph$$ on a zig-zag path

Solution

Apart from motion on straight road, for all other cases, direction of motion changes although the speed remains uniform.
So, speed remaining constant, velocity is variable for all other cases.
Question 6
1 / -0

Choose the correct statement:

A
Velocity determines direction of motion of a body

B
Acceleration determines direction of motion of a body

C
Both velocity and acceleration determine direction of motion of a body

D
Neither velocity nor acceleration determine direction of motion of a body

Solution

Velocity, being a vector, gives the direction of the change of position of a body. Hence it determines the direction of motion of a body. In contrast, acceleration doesn't need to relate to the direction of motion.
Question 7
1 / -0

Identify the wrong statement about acceleration.

A
Acceleration is rate of change of velocity per second

B
Acceleration is rate of change of speed per second in a certain direction

C
Acceleration is a vector quantity

D
Unit of acceleration is $$m{s}^{-1}$$

Solution

Acceleration= rate of change of velocity = change in velocity velocity / time =$$\dfrac{ms^{-1}}{s}= ms^{-2}$$

Unit of acceleration is $$m{s}^{-2}$$.

Hence, option D is correct
Question 8
1 / -0

Identify the correct statement:

A
Acceleration increases velocity, retardation decreases it

B
Acceleration decreases velocity, retardation increases it

C
Acceleration and retardation both increase velocity

D
Acceleration and retardation both decrease velocity

Solution

Acceleration is the rate of increase of velocity.
Retardation is the rate of decrease of velocity. It is also called $$\text{Negative Acceleration}$$.
Question 9
1 / -0

Which of the following terms does not go well with the motion of a bus on a crowded road.

A
Uniform velociity

B
Variable velocity

C
Variable acceleration

D
Variable speed

Solution

On a crowded road, depending on traffic conditions, the bus driver has to change its speed and direction of motion many times. The driver will have to frequently apply brakes as well. He might also have to accelerate the bus with different rates. So, the velocity changes both by magnitude and direction. Thus, uniform velocity is not attained in this case.
Question 10
1 / -0

Direction of motion of a body is given by

A
its speed

B
its velocity

C
both its speed and velocity

D
neither of its speed and velocity

Solution

Velocity is a vector. So, it gives the magnitude of speed and the direction of motion of the body as well.
Speed being a scalar, does not give the direction of motion.

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Re-Attempt Weekly Quiz Competition

Motion Test - 25

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Motion Test - 25

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SHARING IS CARING

Question 1

acceleration

retardation

either acceleration or retardation

neither acceleration nor retardation

Solution

Question 2

$$m$$

$$cm$$

$$km$$

none of these

Solution

Question 3

its velocity increases by $$1 m{s}^{-1}$$ per second

its velocity remains constant

its velocity decreases by $$1 m{s}^{-1}$$ per second

none of these

Solution

Question 4

$$2 m{s}^{-1}$$

$$5 m{s}^{-1}$$

$$7.5 m{s}^{-1}$$

$$10 m{s}^{-1}$$

Solution

Question 5

A car moving at $$80 kmph$$ on a straight road

A car moving at $$80 kmph$$ on a square track

A car moving at $$80 kmph$$ on a circular track

A car moving at $$80 kmph$$ on a zig-zag path

Solution

Question 6

Velocity determines direction of motion of a body

Acceleration determines direction of motion of a body

Both velocity and acceleration determine direction of motion of a body

Neither velocity nor acceleration determine direction of motion of a body

Solution

Question 7

Acceleration is rate of change of velocity per second

Acceleration is rate of change of speed per second in a certain direction

Acceleration is a vector quantity

Unit of acceleration is $$m{s}^{-1}$$

Solution

Question 8

Acceleration increases velocity, retardation decreases it

Acceleration decreases velocity, retardation increases it

Acceleration and retardation both increase velocity

Acceleration and retardation both decrease velocity

Solution

Question 9

Uniform velociity

Variable velocity

Variable acceleration

Variable speed

Solution

Question 10

its speed

its velocity

both its speed and velocity

neither of its speed and velocity

Solution

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