MCQExams
0:0:1
CBSE
JEE
NTSE
NEET
Practice
Homework
×
CBSE Questions for Class 7 Physics Motion And Time Quiz 1 - MCQExams.com
CBSE
Class 7 Physics
Motion And Time
Quiz 1
When a graph between two physical quantities is a straight line, the two quantities are
Report Question
0%
Both constant
0%
Independent of each other
0%
Directly proportional
0%
Inversely proportional
Explanation
As we know the equation of a straight line is $$Y=mX+C$$
Let us assume $$X$$ and $$Y$$ are two different physical quantity and C is any constant. and the graph between them is straight line.
According to above equation,
$$Y\propto X$$
Hence,
$$X$$ and
$$Y$$ are
Directly proportional.
Option C
Four cars A, B, C and D are moving on a leveled road. Their distance versus time graphs are shown in the given figure. Choose the correct statement
Report Question
0%
Car A is faster than car D.
0%
Car B is the slowest.
0%
Car D is faster than car C.
0%
Car C is the slowest.
Explanation
The slope of distance vs time graphs represent speed. B has the minimum slope and hence the minimum speed.
A vehicle is moving on a road. Ink drops are falling, one at a time, on the road from the vehicle. After the vehicle has moved away, what one observes is shown (qualitatively) in the figure given below. From the figure we can conclude about the vehicle to be moving...
Report Question
0%
From left to right with increasing speed
0%
From left to right with decreasing speed
0%
From right to left with increasing speed
0%
From right to left with decreasing speed
Explanation
As we can see the curved surface is towards the left side so the vehicle is moving from left to right and the distance between drops decreases continuously so the speed of the vehicle decreasing.
What does the path of an object look like when it is in uniform motion?
Report Question
0%
Straight line
0%
Zig-Zag
0%
Curved line
0%
Cicular
Explanation
In uniform motion, the object moves along a straight path i.e. the path of object is a straight line.
A driver is driving his car along a road is shown in figure. The driver makes sure that the speedometer reads exactly $$40 {km}/{h}$$. What happens to the speed of the car from $$P$$ to $$R$$ ?
Report Question
0%
Speed remains constant
0%
Speed first increases then decreases
0%
Speed first decreases then increases
0%
Nothing can be decided
Explanation
The driver makes sure that the speedometer reads exactly $$40km/h.$$
The speedometer reads the speed of the car. If the reading of the speedometer is constant then the speed remains constant.
Given distance $$(S)$$-time $$(t)$$ graph represents motion with :
Report Question
0%
uniform velocity
0%
uniform acceleration with initial velocity
0%
uniform retardation with steady rate
0%
none of the above
Explanation
In the given graph the object travels equal distances in equal intervals of time.
Hence, the body possess uniform velocity.
Option A is the correct answer.
Which of the following distance-time graphs is possible?
Report Question
0%
0%
0%
0%
A body having uniform speed will always have uniform velocity.
Report Question
0%
True
0%
False
Explanation
If a body is traveling such that its speed is uniform but its direction is changing then the body will not have uniform velocity. ex: Uniform circular motion.
Thus the statement is $$False$$
Hence correct answer is option $$B$$
When the distance an object travels is directly proportional to the time, it is said to travel with
Report Question
0%
Constant speed
0%
Zero velocity
0%
Constant acceleration
0%
Uniform velocity
Explanation
When the distance an object travels is directly proportional to time, it is said to travel with Constant Speed.
$$ Speed = \dfrac{distance \ travelled}{time}$$
When the distance covered by an object is directly
proportional to the time interval, it is said to travel with :
Report Question
0%
Constant speed
0%
Zero velocity
0%
Constant acceleration
0%
Uniform velocity
Explanation
When distance is proportional to time, the ratio of distance and time remains constant. This means that in equal time intervals, the particle is travelling equal distances. So clearly the speed of the particle remains constant.
A is the correct answer.
An aeroplane cruising in the air is an example of
Report Question
0%
uniform motion
0%
non uniform motion
0%
either uniform or non uniform motion
0%
neither uniform nor non uniform motion
Explanation
An aeroplane cruising in the air moves with a constant speed. So, its motion is uniform motion.
The motion of second's hand in a clock is an example of
Report Question
0%
uniform motion
0%
non-uniform motion
0%
a combination of uniform and non-uniform motion
0%
neither uniform nor non-uniform motion
Explanation
The head of the second's hand covers equal distance in equal intervals of time.
So, its motion is uniform motion.
Motion of a bus moving on a crowded road is an example of
Report Question
0%
uniform motion
0%
non-uniform motion
0%
either uniform or non-uniform motion
0%
neither uniform nor non-uniform motion
Explanation
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.
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?
Report Question
0%
$$1m,\;4m,\;9m,\;16m,\;25m$$
0%
$$2m,\;2m,\;4m\;4m,\;6m$$
0%
$$2m,\;4m,\;6m,\;8m,\;10m$$
0%
$$6m,\;11m,\;15m,\;18m,\;20m$$
0%
$$4m,\;9m,\;15m,\;22m,\;29m$$
Explanation
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.
Interval between two events is called
Report Question
0%
Solar day
0%
Hour
0%
Time
0%
Duration
Explanation
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.
State whether given statement is True or False.
The rate of change of displacement with time is called speed
Report Question
0%
True
0%
False
Explanation
The rate of change of displacement with time is called velocity. Hence, the given statement is false.
A body in uniform motion moves with:
Report Question
0%
constant velocity
0%
constant speed
0%
constant acceleration
0%
none of these
Explanation
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
A body in uniform motion covers
Report Question
0%
different distances in equal intervals of time
0%
equal distances in different intervals of time
0%
equal distances in equal intervals of time
0%
different distances in different intervals of time
Explanation
A body is said to be in uniform motion if it covers equal distances in equal intervals of time.
In between starting from one station and stopping at the next, the motion of a train is an example of
Report Question
0%
uniform motion
0%
non-uniform motion
0%
either uniform or non-uniform motion
0%
neither uniform nor non-uniform motion
Explanation
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.
Choose the correct option.
Odometer: Distance :: ______:______
Report Question
0%
Weighing scale : Weight
0%
Length : Width
0%
Inch : Foot
0%
Mileage : Speed
Explanation
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.
In which of the following graphs, The speed of the body is zero?
Report Question
0%
0%
0%
0%
Explanation
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.
________ gives the speed of the vehicle every instant in $$km/h$$. Fill in the blank.
Report Question
0%
Speedometer
0%
Odometer
0%
Anemometer
0%
None of the above
Explanation
Speedometer gives the instantaneous speed of the vehicle. It measures the speed of vehicle in $$km/h$$.
Speed can be defined as :
Report Question
0%
$$\dfrac{Distance }{time}$$
0%
$$\dfrac{Distance }{{Time}^2}$$
0%
$$\dfrac{Time}{Distance}$$
0%
$$None\ of\ the\ above$$
Explanation
Speed of the body is defined as the distance travelled by the body in unit time.
Mathematically, $$Speed = \dfrac{Distance}{time}$$
Which of the following are examples of non-uniform motion along a straight line?
Report Question
0%
horse pulling a cart
0%
brakes applied on a fast moving car
0%
train on a straight bridge
0%
all of the above
Explanation
In non-uniform motion, the speed of the object changes along a straight line. It may increase or decrease for different intervals of time. When brakes are applied, the car decelerates and its speed changes with time. So applying brakes on a fast moving car is the example of non-uniform motion.
In distance-time graph, which of the following is plotted on the x-axis?
Report Question
0%
speed
0%
distance
0%
time
0%
none of the above
Explanation
In distance-time graph, time is plotted on x-axis and distance is plotted on y-axis. distance travel always depends on time, ie $$D=\displaystyle f(t)$$.
In distance-time graph, which of the following is plotted on the y-axis?
Report Question
0%
speed
0%
distance
0%
time
0%
none of the above
Explanation
In the distance-time graph, time is plotted on the x-axis, and distance is plotted on the y-axis as distance depends on time.
In the given distance-time graph, what is the distance corresponding to $$4\ \text{min}$$?
Report Question
0%
$$2\ km$$
0%
$$3\ km$$
0%
$$4\ km$$
0%
$$5\ km$$
Explanation
Draw a line parallel to the y-axis at $$4 \ \text{min}$$
point. Then draw a line parallel to the x-axis from this point. This line will intersect the y-axis at $$4 \ km$$
.
According to SI system, the standard unit of time is :
Report Question
0%
minute
0%
hour
0%
day
0%
second
Explanation
According to SI system, the standard unit of time is second.
Gradient of line of displacement-time graph gives the :
Report Question
0%
acceleration
0%
velocity
0%
displacement
0%
none of these
Explanation
Slope of line of displacement time graph$$=\cfrac { ds }{ dt } $$
The rate of change of position i.e., rate of change of displacement with time is called velocity
A dancer demonstrating dance steps along a straight line. The displacement time graph is given.
Find the average speed for the dance step depicted by CD.
Report Question
0%
$$1 \ m s^{-1}$$
0%
$$2 \ m s^{-1}$$
0%
$$2.75 \ m s^{-1}$$
0%
$$0.89 \ m s^{-1}$$
Explanation
Average speed is defined as the ratio of the distance covered to the total time taken .
Average speed $$s_{av} = \dfrac{ Distance \ covered}{ time \ taken}$$
For step CD
Initial position is $$4$$, final position is $$0$$, hence distance covered $$=4 \ m$$
Total time is $$6-4 = 2 \ sec$$
So average speed is $$s = \dfrac{4}{2}=2\ m/s$$
So option $$B$$ is correct.
0:0:1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
0
Answered
0
Not Answered
0
Not Visited
Correct : 0
Incorrect : 0
Report Question
×
What's an issue?
Question is wrong
Answer is wrong
Other Reason
Want to elaborate a bit more? (optional)
Practice Class 7 Physics Quiz Questions and Answers
<
>
Support mcqexams.com by disabling your adblocker.
×
Please disable the adBlock and continue.
Thank you.
Reload page
