Motion and Time Test

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Motion and Time Test - 7

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Question 1
1 / -0

The distance travelled by 5 identical particles is given below in the options A, B, C, D and E respectively at specific time interval. Which object is moving with a constant velocity?

A
$$1m,\;4m,\;9m,\;16m,\;25m$$

B
$$2m,\;2m,\;4m\;4m,\;6m$$

C
$$2m,\;4m,\;6m,\;8m,\;10m$$

D
$$6m,\;11m,\;15m,\;18m,\;20m$$

E
$$4m,\;9m,\;15m,\;22m,\;29m$$

Solution

If the particle moves with constant velocity,
Velocity $$v=\dfrac{\Delta x}{\Delta t}=constant$$
$$\implies \Delta x=constant \times \Delta t$$
Thus for equal time intervals, the distance traveled must be equal.
The distance traveled by object in option C remains the same for each interval and is equal to $$\Delta x=4m-2m=2m$$
Hence correct answer is option C.
Question 2
1 / -0

Interval between two events is called

A
Solar day

B
Hour

C
Time

D
Duration

Solution

Interval between two events is known as Duration. For example : A work start at 10 AM and it ends 12 AM. Duration of work will be 2 hr.
Question 3
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The motion of second's hand in a clock is an example of

A
uniform motion

B
non-uniform motion

C
a combination of uniform and non-uniform motion

D
neither uniform nor non-uniform motion

Solution

The head of the second's hand covers equal distance in equal intervals of time.
So, its motion is uniform motion.
Question 4
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Motion of a bus moving on a crowded road is an example of

A
uniform motion

B
non-uniform motion

C
either uniform or non-uniform motion

D
neither uniform nor non-uniform motion

Solution

In a crowded road, moving through different traffic conditions, a bus travels at different speeds at different points of time.
So, this is an example of non-uniform motion.
Question 5
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A body in uniform motion moves with:

A
constant velocity

B
constant speed

C
constant acceleration

D
none of these

Solution

A motion of a body is said to be uniform when it covers equal distance in equal interval of time. It can be rectilinear, circular. In uniform motion, direction does not matter whether it is changing or not, but magnitude ie speed needs to be constant.
Option B
Question 6
1 / -0

A body in uniform motion covers

A
different distances in equal intervals of time

B
equal distances in different intervals of time

C
equal distances in equal intervals of time

D
different distances in different intervals of time

Solution

A body is said to be in uniform motion if it covers equal distances in equal intervals of time.
Question 7
1 / -0

In between starting from one station and stopping at the next, the motion of a train is an example of

A
uniform motion

B
non-uniform motion

C
either uniform or non-uniform motion

D
neither uniform nor non-uniform motion

Solution

A train starts from a station, accelerates, reaches its highest speed, slows down (decelerates) and finally stops at the next station.
So, during its motion between two stations, the train moves with different speeds.
This is an example of non-uniform motion.
Question 8
1 / -0

Choose the correct option.
Odometer: Distance :: ______:______

A
Weighing scale : Weight

B
Length : Width

C
Inch : Foot

D
Mileage : Speed

Solution

An odometer is an instrument used in a vehicle to measure the distance covered by it.
Similarly, the weighing scale is an instrument used to measure the weight of an object.
Question 9
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In which of the following graphs, The speed of the body is zero?

A

B

C

D

Solution

Option D

According to given question, Speed of a body is zero. It means that position of body is not change with respect to time.
In options A, B, and C: The distance of an object is increasing with respect to time. Hence Object is in motion. Therefore given body will have some velocity in given time range.
In option D: The distance of a body is not changing with respect to time hence this body will be at rest and its velocity will be zero in the given time range.
Question 10
1 / -0

________ gives the speed of the vehicle every instant in $$km/h$$. Fill in the blank.

A
Speedometer

B
Odometer

C
Anemometer

D
None of the above

Solution

Speedometer gives the instantaneous speed of the vehicle. It measures the speed of vehicle in $$km/h$$.