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In which of the following activities the work is said to be done?
- a)Khushi is pushing a wall of a house but fails to do so
- b)Pinki is walking on a level road with a book on his head.
- c)Shruti is stretching a string.
- d)Harsh is reading a book
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
In which of the following activities the work is said to be done?a)Khu...
No work is done in reading a book, pulling wall of house and walking on a level road with book on his head as there is no change in the position of object on which force is applied. Stretching string causes displacement, so it is a work.
Most Upvoted Answer
In which of the following activities the work is said to be done?a)Khu...
Understanding Work in Physics
In physics, the concept of work is defined based on the force applied and the movement of an object in the direction of that force. Work is only done when a force causes displacement of an object. Let's analyze each option to determine where work is done.
Option A: Khushi Pushing a Wall
- Khushi is applying force on the wall.
- However, since the wall does not move, there is no displacement.
- Thus, no work is done.
Option B: Pinki Walking on a Level Road
- Pinki is walking and carrying a book on her head.
- While she is exerting force to carry the book, the vertical force (upward) is perpendicular to the direction of her movement (horizontal).
- Therefore, no work is done on the book as it does not move in the direction of the force applied.
Option C: Shruti Stretching a String
- When Shruti stretches the string, she applies a force to it.
- As the string extends, there is a displacement in the direction of the force.
- This means that work is done in stretching the string.
- Hence, work is done in this scenario.
Option D: Harsh Reading a Book
- Harsh is not exerting any force that results in the movement of an object in the direction of that force.
- Therefore, no work is done while reading.
Conclusion
Based on the analysis, the correct answer is option 'C' – Shruti is stretching a string, as it involves both force and displacement, thus fulfilling the condition for work to be done.
In physics, the concept of work is defined based on the force applied and the movement of an object in the direction of that force. Work is only done when a force causes displacement of an object. Let's analyze each option to determine where work is done.
Option A: Khushi Pushing a Wall
- Khushi is applying force on the wall.
- However, since the wall does not move, there is no displacement.
- Thus, no work is done.
Option B: Pinki Walking on a Level Road
- Pinki is walking and carrying a book on her head.
- While she is exerting force to carry the book, the vertical force (upward) is perpendicular to the direction of her movement (horizontal).
- Therefore, no work is done on the book as it does not move in the direction of the force applied.
Option C: Shruti Stretching a String
- When Shruti stretches the string, she applies a force to it.
- As the string extends, there is a displacement in the direction of the force.
- This means that work is done in stretching the string.
- Hence, work is done in this scenario.
Option D: Harsh Reading a Book
- Harsh is not exerting any force that results in the movement of an object in the direction of that force.
- Therefore, no work is done while reading.
Conclusion
Based on the analysis, the correct answer is option 'C' – Shruti is stretching a string, as it involves both force and displacement, thus fulfilling the condition for work to be done.
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In which of the following activities the work is said to be done?a)Khushi is pushing a wall of a house but fails to do sob)Pinki is walking on a level road with a book on his head.c)Shruti is stretching a string.d)Harsh is reading a bookCorrect answer is option 'C'. Can you explain this answer? for Class 9 2025 is part of Class 9 preparation. The Question and answers have been prepared according to the Class 9 exam syllabus. Information about In which of the following activities the work is said to be done?a)Khushi is pushing a wall of a house but fails to do sob)Pinki is walking on a level road with a book on his head.c)Shruti is stretching a string.d)Harsh is reading a bookCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 9 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In which of the following activities the work is said to be done?a)Khushi is pushing a wall of a house but fails to do sob)Pinki is walking on a level road with a book on his head.c)Shruti is stretching a string.d)Harsh is reading a bookCorrect answer is option 'C'. Can you explain this answer?.
In which of the following activities the work is said to be done?a)Khushi is pushing a wall of a house but fails to do sob)Pinki is walking on a level road with a book on his head.c)Shruti is stretching a string.d)Harsh is reading a bookCorrect answer is option 'C'. Can you explain this answer? for Class 9 2025 is part of Class 9 preparation. The Question and answers have been prepared according to the Class 9 exam syllabus. Information about In which of the following activities the work is said to be done?a)Khushi is pushing a wall of a house but fails to do sob)Pinki is walking on a level road with a book on his head.c)Shruti is stretching a string.d)Harsh is reading a bookCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 9 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In which of the following activities the work is said to be done?a)Khushi is pushing a wall of a house but fails to do sob)Pinki is walking on a level road with a book on his head.c)Shruti is stretching a string.d)Harsh is reading a bookCorrect answer is option 'C'. Can you explain this answer?.
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