In Class 11 Final Exams there will be Case studies and Passage Based Questions will be asked, So practice these types of questions. Study Rate is always there to help you. Free PDF Downloads of CBSE Class 11 Physics Chapter 3 Case Study and Passage-Based Questions with Answers were Prepared Based on the Latest Exam Pattern. Students can solve Class 11 Physics Case Study Questions Motion in a Straight Line to know their preparation level.
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In CBSE Class 11 Physics Paper, There will be a few questions based on case studies and passage-based as well. In that, a paragraph will be given, and then the MCQ questions based on it will be asked.
Motion in a Straight Line Case Study Questions With Answers
Here, we have provided case-based/passage-based questions for Class 11 Physics Chapter 3 Motion in a Straight Line
Case Study/Passage-Based Questions
Case Study 1:
When an object is in motion, its position changes with time. But how fast is the position changing with time and in what direction? To describe this, we define the quantity average velocity. Average velocity is defined as the change in position or displacement (△x) divided by the time intervals (△t), in which the displacement occurs:
Where x2 and x1 are the positions of the object at times t2 and t1, respectively. The SI unit for velocity is m/s or m s–1, although km h–1 is used in many everyday applications. Like displacement, average velocity is also a vector quantity. Average speed is defined as the total path length traveled divided by the total time interval during which the motion has taken place:
Average speed = Total path length/ Total time interval.
Average speed has obviously the same unit (m s–1) as that of velocity. But it does not tell us in what direction an object is moving. Thus, it is always positive (in contrast to the average velocity which can be positive or negative). If the motion of an object is along a straight line and in the same direction, the magnitude of displacement is equal to the total path length.
The velocity at an instant is defined as the limit of the average velocity as the time interval Dt becomes infinitesimally small. In other words
Note that for uniform motion, velocity is the same as the average velocity at all instants. Instantaneous acceleration is defined in the same way as the instantaneous velocity
1) For uniform motion instantaneous velocity is the same as
- a) Average velocity
- b) Average acceleration
- c) Instantaneous speed
- d) None of these
Answer: a) Average velocity
2 If velocity is constant then
- a) Acceleration is zero
- b) Acceleration is positive
- c) Acceleration is negative
- d) None of these
Answer: a) Acceleration is zero
What is average velocity defined as?
a) Total path length / Total time interval
b) Displacement / Time interval
c) Speed / Direction
d) Time interval / Displacement
Answer: b) Displacement / Time interval
Which unit is used for velocity in everyday applications?
a) m/s
b) m s–1
c) km/h
d) Both a and b
Answer:c) km/h
Which of the following is true about average speed?
a) It is a vector quantity
b) It can be negative
c) It is always positive
d) It describes the direction of motion
Answer: c) It is always positive
Case Study 2:
When an object is in motion, its position changes with time. So, the quantity that describes how fast is the position changes w.r.t. time and in what direction is given by average velocity. It is defined as the change in position or displacement (Δx ) divided by the time interval (Δt ) in which that displacement occurs. However, the quantity used to describe the rate of motion over the actual path is average speed. It is defined as the total distance traveled by the object divided by the total time taken.
(i) A 250 m long train is moving with a uniform velocity of 45 km/h. The time taken by the train to cross a bridge of length 750 m is
(a) 56 s
(b) 68 s
(c) 80 s
(d) 92 s
Answer: (c) 80 s
(ii) A truck requires 3 hr to complete a journey of 150 km. What is the average speed?
(a) 50 km/h
(b) 25 km/h
(c) 15 km/h
(d) 10 km/h
Answer: (a) 50 km/h
(iii) Average speed of a car between points A and B is 20 m/s, between B and C is 15 m/s and between C and D is 10 m/s. What is the average speed between A and D, if the time taken in the mentioned sections is 20s, 10s and 5s, respectively?
(a) 17.14 m/s
(b) 15 m/s
(c) 10 m/s
(d) 45 m/s
Answer: (a) 17.14 m/s
(iv) A cyclist is moving on a circular track of a radius of 40 m and completes half a revolution in 40 s. Its average velocity (in m/s) is
(a) zero
(b) 2
(c) 4π
(d) 8π
Answer: (b) 2
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