MCQ: Speed and Velocity

# MCQ: Speed and Velocity - Class 9

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## 20 Questions MCQ Test Science Class 9 - MCQ: Speed and Velocity

MCQ: Speed and Velocity for Class 9 2023 is part of Science Class 9 preparation. The MCQ: Speed and Velocity questions and answers have been prepared according to the Class 9 exam syllabus.The MCQ: Speed and Velocity MCQs are made for Class 9 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for MCQ: Speed and Velocity below.
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MCQ: Speed and Velocity - Question 1

### The SI unit for speed is

Detailed Solution for MCQ: Speed and Velocity - Question 1
You know that speed=distance/time. and the si unit of distance=metre and the si unit of time =second. so, the si unit of speed=si unit of distance/ si unit of time=m/s.
MCQ: Speed and Velocity - Question 2

### How far will a car travel in 25 min at 12 m/s?

Detailed Solution for MCQ: Speed and Velocity - Question 2
No. of seconds in 1 minute = 60 No. of seconds in 25 minutes = (60 x 25) = 1500 sec Speed = 12 m/s In 1500 sec distance travelled = (1500 x 12) = 18000 m or 18 km That is c) 18 km.
MCQ: Speed and Velocity - Question 3

### What is the average velocity of a car that moved 60 km in 3 hours?

Detailed Solution for MCQ: Speed and Velocity - Question 3
The answer is 20 because when you divide the distance with time it is 20... 60÷3 =30
MCQ: Speed and Velocity - Question 4

The ______ of a distance versus time graph is speed.

Detailed Solution for MCQ: Speed and Velocity - Question 4

We can use Steepness, or slope, of a line in a distance - time  graph  to determine the speed of an object if speed is constant. The slope of the line is calculated by dividing the change in distance by the change in time for that time interval.

MCQ: Speed and Velocity - Question 5

1 km/ h = ________ m/s

Detailed Solution for MCQ: Speed and Velocity - Question 5
1km/h= (1×1000)m/h= 1000m/h= 1000m/3600s= 10m/36s= 5m/18s
MCQ: Speed and Velocity - Question 6

If car A is at 40 km/h and car B is at 10 km/h in the opposite direction, what is the velocity of the car A relative to the car B?

Detailed Solution for MCQ: Speed and Velocity - Question 6
Taking the formula when both bodies are moving along same direction we have :
V(AB) =  V(A) -  V(B)  =  80 - 60  = 20 km/hr

Hence the velocity of car A with respect to car B is 20 km/hr in same direction.
MCQ: Speed and Velocity - Question 7

Which of the following is a correct measure of velocity?

Detailed Solution for MCQ: Speed and Velocity - Question 7

Velocity is a physical vector quantity, both magnitude and direction are needed to define it. Velocity is measured in  m/s.

MCQ: Speed and Velocity - Question 8

If a person walked at 2 m/s for 12 s he/she would travel a distance of

Detailed Solution for MCQ: Speed and Velocity - Question 8
1second =2meter 12 second = 12*2meter 24metet
MCQ: Speed and Velocity - Question 9

The speed at any instant of time is known as

Detailed Solution for MCQ: Speed and Velocity - Question 9

The instantaneous speed of an object is defined as the speed of the object at any given instant. The instantaneous speed of an object can be determined by determining the average speed over a short distance (and short time), and using this approximation as the instantaneous speed.

MCQ: Speed and Velocity - Question 10

An object travels 20 m in 5 sec and then another 40 m in 5 sec. What is the average speed of the object?

Detailed Solution for MCQ: Speed and Velocity - Question 10

Average speed= (Total Distance)/(Total time)

= (20 m + 40 m)/(5 sec + 5 sec)

=60 m/10 sec

=6m/s

MCQ: Speed and Velocity - Question 11

______________ describes how fast something is going, whereas, __________ describes how fast something is going in a certain direction.

Detailed Solution for MCQ: Speed and Velocity - Question 11
Speed is the quantity which show only magnitude of the body whereas velocity is the quantity which shows the both magnitude and direction.
MCQ: Speed and Velocity - Question 12

Speed of 90 km/h when expressed in m/s is

Detailed Solution for MCQ: Speed and Velocity - Question 12
Because when we convert km/h into m/s we multiply 5/18 into km/h so we get m/s according to question we we multiply 5/18 into 90 km/h so90*5/18 = 25SO THE ANSWER IS 25.
MCQ: Speed and Velocity - Question 13

Speed of sound in water is 1500 m s-1, depth of water when reflected sound waves are detected after 0.40 s is

Detailed Solution for MCQ: Speed and Velocity - Question 13

Since D=vt
So,1500×40/100=600m

MCQ: Speed and Velocity - Question 14

The speed-time graph for a particle moving at constant speed is a straight-line ________ to the time axis.

Detailed Solution for MCQ: Speed and Velocity - Question 14
The speed-time graph for a particle moving at constant speed is a straight-line parallel to the time axis.
MCQ: Speed and Velocity - Question 15

Distance covered by a body from velocity-time graph is

Detailed Solution for MCQ: Speed and Velocity - Question 15
The area under the line in a velocity-time graph represents the distance travelled. To find the distance travelled in the graph above, you need to find the area of the light-blue triangle and the dark-blue rectangle. The width of the rectangle is 6 seconds and the height is 8 metres per second.
MCQ: Speed and Velocity - Question 16

______ is a unit of speed:

Detailed Solution for MCQ: Speed and Velocity - Question 16
Speed = distance /time unit of distance is m unit of time is S hence, unit of speed = m/s
MCQ: Speed and Velocity - Question 17

Speed of sound in water is 1500 m s-1, depth of water when reflected sound waves are detected after 0.40 s is

MCQ: Speed and Velocity - Question 18

How long would it take to travel 50 km traveling at a speed of 10 km/hr?

Detailed Solution for MCQ: Speed and Velocity - Question 18
We know that distance = speed * time therefore 1/time = speed / distance time = distance / speed =50 / 10 = 5 hours (Ans)
MCQ: Speed and Velocity - Question 19

Name the instrument used to measure instantaneous speed of a vehicle

Detailed Solution for MCQ: Speed and Velocity - Question 19

The speedometer device is used to measure speed. A speedometer is also called a speedometer, it is a gauge that measures and displays the instantaneous speed of a vehicle.

MCQ: Speed and Velocity - Question 20

The area under the speed-time graph gives the ________.

Detailed Solution for MCQ: Speed and Velocity - Question 20
Since Distance = Speed * Time.. Therefore the graph of speed - time gives the distance.

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## Science Class 9

66 videos|355 docs|97 tests