All Courses
Get the App Signup / Login
Sign in Open App
Class 9 Exam  >  Class 9 Tests  >  Test: Work and Energy- Assertion & Reason Type Questions- 1 - Class 9 MCQ

Test: Work and Energy- Assertion & Reason Type Questions- 1 - Class 9 MCQ


Test Description

10 Questions MCQ Test - Test: Work and Energy- Assertion & Reason Type Questions- 1

Test: Work and Energy- Assertion & Reason Type Questions- 1 for Class 9 2024 is part of Class 9 preparation. The Test: Work and Energy- Assertion & Reason Type Questions- 1 questions and answers have been prepared according to the Class 9 exam syllabus.The Test: Work and Energy- Assertion & Reason Type Questions- 1 MCQs are made for Class 9 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Work and Energy- Assertion & Reason Type Questions- 1 below.
Solutions of Test: Work and Energy- Assertion & Reason Type Questions- 1 questions in English are available as part of our course for Class 9 & Test: Work and Energy- Assertion & Reason Type Questions- 1 solutions in Hindi for Class 9 course. Download more important topics, notes, lectures and mock test series for Class 9 Exam by signing up for free. Attempt Test: Work and Energy- Assertion & Reason Type Questions- 1 | 10 questions in 20 minutes | Mock test for Class 9 preparation | Free important questions MCQ to study for Class 9 Exam | Download free PDF with solutions
Test: Work and Energy- Assertion & Reason Type Questions- 1 - Question 1
Save

Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Work done is different while climbing on stairs or using lift.

Reason : Work done depends only on the initial and final position of the object.

Detailed Solution for Test: Work and Energy- Assertion & Reason Type Questions- 1 - Question 1
Work done is a state function. It depends on the initial and final position of the object and not on the path followed. In the above example initial and final position is same therefore work done is same in both cases.
Test: Work and Energy- Assertion & Reason Type Questions- 1 - Question 2
Save

Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Work done by the force can be positive or negative.

Reason : Force is taken as positive when it acts opposite to the direction of displacement.

Detailed Solution for Test: Work and Energy- Assertion & Reason Type Questions- 1 - Question 2

Assertion (A) is true but reason (R) is false.  (A).

Work done by a force is given by the equation: W = F * d * cos(θ), where F is the force, d is the displacement, and θ is the angle between the force and displacement vectors. The angle between the force and displacement vectors is measured in radians. The cosine of the angle is positive when the force and displacement vectors are in the same direction, and negative when they are in opposite directions. The work done by the force can be positive or negative depending on the direction of the force and displacement. If the force and displacement are in the same direction, the work done is positive and if they are in opposite direction, the work done is negative. The reason given in the statement that force is taken as positive when it acts opposite to the direction of displacement, supports the assertion that work done by the force can be positive or negative.

1 Crore+ students have signed up on EduRev. Have you? Download the App
Test: Work and Energy- Assertion & Reason Type Questions- 1 - Question 3
Save

Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : A 40 kg girl is running along a circular path of radius 1 m with a uniform speed. The work done by the girl is zero.

Reason : In this case, displacement is zero after one complete rotation.

Detailed Solution for Test: Work and Energy- Assertion & Reason Type Questions- 1 - Question 3

Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).

The work done by a force on an object is given by the equation W = F * d * cos(θ), where F is the force, d is the displacement and θ is the angle between the force and displacement vectors. In this case, the girl is running along a circular path with a uniform speed. The force acting on her is the force of gravity, which is always perpendicular to the surface of the earth. The angle between the force and displacement vectors is 90 degrees, so cos(90) = 0.

Since the angle between the force and displacement vectors is 90 degrees, the work done by the force of gravity on the girl is zero. Additionally, the reason given in the statement that displacement is zero after one complete rotation, also supports the assertion that the work done by the girl is zero.

 

Test: Work and Energy- Assertion & Reason Type Questions- 1 - Question 4
Save

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Energy possessed by a rolling stone is kinetic energy.

Reason : Kinetic energy possessed by an object is due to its motion.
Detailed Solution for Test: Work and Energy- Assertion & Reason Type Questions- 1 - Question 4
Kinetic energy is the energy possessed by an object due to its motion. Moving objects possess kinetic energy. For example, energy possessed by a rolling stone is kinetic energy.
Test: Work and Energy- Assertion & Reason Type Questions- 1 - Question 5
Save

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion: The potential energy of a free falling object decreases progressively.

Reason: It violates the law of conservation of energy.
Detailed Solution for Test: Work and Energy- Assertion & Reason Type Questions- 1 - Question 5
No, it does not violate the law of conservation of energy. Potential energy is converted into total mechanical energy and hence, it remains conserved.
Test: Work and Energy- Assertion & Reason Type Questions- 1 - Question 6
Save

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion: Unit of energy is same as that of work.

Reason: The commercial unit of energy is Joule.
Detailed Solution for Test: Work and Energy- Assertion & Reason Type Questions- 1 - Question 6
The unit of energy is same as that of work that is Joule. Joule is the S.I unit of energy but it is a smaller unit. For commercial purpose, we use kWh as the unit of energy. 1 kWh = 3.6 × 106 joules.
Test: Work and Energy- Assertion & Reason Type Questions- 1 - Question 7
Save

Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion: A lamp consumes 1000 J of electrical energy in 10 s. Its power is 100 W.

Reason: Power is obtained by dividing the energy consumed by the time taken.
Detailed Solution for Test: Work and Energy- Assertion & Reason Type Questions- 1 - Question 7
Power of lamp = Energy/ Time

P = 1000/10 = 100W

Test: Work and Energy- Assertion & Reason Type Questions- 1 - Question 8
Save

Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion: The physical quantity defined by rate of doing work is Energy.

Reason: Its SI unit is J/s.
Detailed Solution for Test: Work and Energy- Assertion & Reason Type Questions- 1 - Question 8
The physical quantity defined by rate of doing work is power. Its SI unit is J/s or Watt.
Test: Work and Energy- Assertion & Reason Type Questions- 1 - Question 9
Save

Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion: SI unit of power is Joules.

Reason: One kWh is equal to 3.6 × 106 J.
Detailed Solution for Test: Work and Energy- Assertion & Reason Type Questions- 1 - Question 9

SI unit of power is Watt. One kWh is equal to 3.6 ×106 J.

Test: Work and Energy- Assertion & Reason Type Questions- 1 - Question 10
Save

Direction: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:

Assertion : A crane P lifts a car up to a certain height in 1 min. Another crane Q lifts the same car up to the same height in 2 min. Then crane P consumes two times more fuel than crane Q.

Reason : Crane P supplies two times more power than crane Q.
Detailed Solution for Test: Work and Energy- Assertion & Reason Type Questions- 1 - Question 10
Fuel is actually the power supplied by a mechanical machine when there is conversion of heat energy to mechanical energy. Here, the fuel consumed by the cranes is equal to the power supplied by the cranes.Let the mass of the car be m, g be the acceleration due to gravity and h be the height up to which the car is lifted by the cranes.

For crane P: The work done by the crane P is equal to WP = mgh. The power supplied by the crane will be PP = WP/t = mgh/1 = mgh and the fuel consumed will also be the same.

For crane Q: The work done by the crane Q is equal to WQ = mgh. The power supplied by the crane will be PQ = WQ/t = mgh/2 and the fuel consumed will also be the same.

As you can see that PQ = PP/2 → PP = 2PQ, which means that the crane P consumes two times more fuel than crane Q and also crane P supplies two times more power than crane Q.

Information about Test: Work and Energy- Assertion & Reason Type Questions- 1 Page
In this test you can find the Exam questions for Test: Work and Energy- Assertion & Reason Type Questions- 1 solved & explained in the simplest way possible. Besides giving Questions and answers for Test: Work and Energy- Assertion & Reason Type Questions- 1, EduRev gives you an ample number of Online tests for practice

Top Courses for Class 9

Download as PDF

Top Courses for Class 9

Important Questions for Work and Energy- Assertion & Reason Type Questions- 1

Find all the important questions for Work and Energy- Assertion & Reason Type Questions- 1 at EduRev.Get fully prepared for Work and Energy- Assertion & Reason Type Questions- 1 with EduRev's comprehensive question bank and test resources. Our platform offers a diverse range of question papers covering various topics within the Work and Energy- Assertion & Reason Type Questions- 1 syllabus. Whether you need to review specific subjects or assess your overall readiness, EduRev has you covered. The questions are designed to challenge you and help you gain confidence in tackling the actual exam. Maximize your chances of success by utilizing EduRev's extensive collection of Work and Energy- Assertion & Reason Type Questions- 1 resources.

Work and Energy- Assertion & Reason Type Questions- 1 MCQs with Answers

Prepare for the Work and Energy- Assertion & Reason Type Questions- 1 within the Class 9 exam with comprehensive MCQs and answers at EduRev. Our platform offers a wide range of practice papers, question papers, and mock tests to familiarize you with the exam pattern and syllabus. Access the best books, study materials, and notes curated by toppers to enhance your preparation. Stay updated with the exam date and receive expert preparation tips and paper analysis. Visit EduRev's official website today and access a wealth of videos and coaching resources to excel in your exam.

Online Tests for Work and Energy- Assertion & Reason Type Questions- 1

Practice with a wide array of question papers that follow the exam pattern and syllabus. Our platform offers a user-friendly interface, allowing you to track your progress and identify areas for improvement. Access detailed solutions and explanations for each test to enhance your understanding of concepts. With EduRev's Online Tests, you can build confidence, boost your performance, and ace Work and Energy- Assertion & Reason Type Questions- 1 with ease. Join thousands of successful students who have benefited from our trusted online resources.
© EduRev
Education Revolution
Signup to see your scores go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup