MCQ: Speed and Velocity - Class 9 MCQ

# MCQ: Speed and Velocity - Class 9 MCQ

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

MCQ: Speed and Velocity for Class 9 2024 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 2024 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

Speed can be calculated by the formula: speed = distance/time.

To find the unit of speed we need to know the units for distance and time first.

The standard unit (SI) for measurement of distance is meter (m) and time is second (s), so the unit of speed will be in meters per second (m/s).

Thus, the speed is measured in meters per second (m/s) in the SI system

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

When the automobile moves at 12 m/s for 25 minutes, we must calculate the distance.

Hence the car will travel 18 km in 25 min at 12 m/s.

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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

Average Velocity Calculation

- Average velocity is calculated by dividing the total distance traveled by the total time taken to travel that distance.
- In this case, the car moved 60 km in 3 hours.
- Therefore, the average velocity is calculated as 60 km / 3 hours = 20 km/h.

Therefore, the average velocity of the car is 20 km/h. So, the correct answer is B: 20 km/h.

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

Conversion of km/h to m/s

1 km = 1000 m and 1 hour = 3600 s

• 1 km/h is equal to 1000 m/3600 s
• Therefore, 1 km/h = 5/18 m/s
• So, the correct answer is D: 5/18
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 opposite direction we have :

V(AB) =  V(A) -  V(B)  =  40 - (-10 ) = 50 km/hr

Hence the velocity of car A with respect to car B is 50 km/hr in opposite 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 vector quantity, which means it has both magnitude and direction. To correctly measure and describe velocity, you need both these components.

Here’s the analysis of the provided options:

1. 30 s: This is a measure of time, not velocity.

2. 30 m/s: This is a measure of speed, not velocity, because it does not include a direction.

3. 30 South: This describes a direction but lacks the magnitude (speed), so it is not a complete measure of velocity.

4. 30 m/s, South: This provides both magnitude (30 m/s) and direction (South), making it a complete measure of velocity.

So, the correct measure of velocity is:

4. 30 m/s, South

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

Calculating Distance Traveled:

Speed = 2 m/s

Time = 12 s

[Distance = Speed x Time]

Therefore, Distance = 2 m/s x 12 s = 24 meters

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

Which of the following is a scalar quantity?

Detailed Solution for MCQ: Speed and Velocity - Question 12

Scalar quantities have only magnitude and no direction. Speed is the scalar quantity here. Therefore, the correct answer is: D) Speed

MCQ: Speed and Velocity - Question 13

A car travels 240 km in 4 hours. Its average speed is:

Detailed Solution for MCQ: Speed and Velocity - Question 13

Average Speed Calculation

• Average speed is calculated by dividing the total distance traveled by the total time taken.

• In this case, the car travels 240 km in 4 hours.

• Therefore, the average speed = Total distance / Total time = 240 km / 4 hours = 60 km/h.

• So, the correct answer is B: 60 km/h.

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

Anjali travels 15km with a speed of 30 km/h. She travels another 25 km with a speed of10 km/h. What is her average speed for the entire journey?

Detailed Solution for MCQ: Speed and Velocity - Question 16

Calculation of Average Speed

- Step 1: Calculate the total distance traveled
- Anjali travels 15 km + 25 km = 40 km in total.

- Step 2: Calculate the total time taken
- Time taken to travel the first 15 km = 15 km / 30 km/h = 0.5 hours
- Time taken to travel the next 25 km = 25 km / 10 km/h = 2.5 hours
- Total time taken = 0.5 hours + 2.5 hours = 3 hours

- Step 3: Calculate the average speed
- Average speed = Total distance / Total time taken
- Average speed = 40 km / 3 hours = 40/3 km/h

Therefore, Anjali's average speed for the entire journey is 40/3 km/h. So, the correct answer is A: 40/3 km/h.

MCQ: Speed and Velocity - Question 17

If a car travels 60 km at a speed of 30 km/h, how long will it take to reach its destination?

Detailed Solution for MCQ: Speed and Velocity - Question 17

Calculating the Time Taken to Reach Destination

- Given:
- Distance traveled: 60 km
- Speed of the car: 30 km/h

- Formula:
- Time = Distance / Speed

- Calculation:
- Time = 60 km / 30 km/h
- Time = 2 hours

Therefore, it will take 2 hours for the car to reach its destination. So, the correct answer is option A: 2 hours.

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

Area under the speed-time graph gives the distance:

• When calculating the area under a speed-time graph, you are essentially finding the total distance traveled by an object over a certain period of time.
• This is because the area under a speed-time graph represents the total distance covered by an object as it moves at varying speeds.
• By finding the area under the curve on a speed-time graph, you can determine the total distance traveled by the object during that time interval.

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## Science Class 9

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