Chapter 10: Work and Energy Assertion-Reason Questions | science Class 9 CBSE

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Chapter 10: Work and Energy Assertion-Reason Questions | science Class 9 CBSE | ByteNotes.in

Assertion-Reason

Check the statement and reason

A-R

Question 1

Logic Check

Assertion (A): Work is said to be done only when a force is applied and the object gets displaced. Reason (R): Both force and displacement are necessary for scientific work to be done.

Reasoning Options

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Assertion-Reason

Check the statement and reason

A-R

Question 2

Logic Check

Assertion (A): A student studying hard and getting tired is doing scientific work. Reason (R): Scientific work is related to physical displacement caused by force.

Reasoning Options

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Assertion-Reason

Check the statement and reason

A-R

Question 3

Logic Check

Assertion (A): When an object does not move even after applying a force, no work is done. Reason (R): Work requires displacement of the object in the direction of force.

Reasoning Options

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Assertion-Reason

Check the statement and reason

A-R

Question 4

Logic Check

Assertion (A): Lifting a book involves positive work. Reason (R): The force applied and displacement of the book are in the same direction.

Reasoning Options

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Assertion-Reason

Check the statement and reason

A-R

Question 5

Logic Check

Assertion (A): Work done can be positive or negative. Reason (R): Work is positive when force and displacement are in the same direction and negative when they are opposite.

Reasoning Options

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Assertion-Reason

Check the statement and reason

A-R

Question 6

Logic Check

Assertion (A): Work done is a scalar quantity. Reason (R): It has magnitude but no specific direction.

Reasoning Options

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Assertion-Reason

Check the statement and reason

A-R

Question 7

Logic Check

Assertion (A): The unit of work is watt. Reason (R): One watt is equal to one newton meter per second.

Reasoning Options

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Assertion-Reason

Check the statement and reason

A-R

Question 8

Logic Check

Assertion (A): Power is defined as the rate of doing work. Reason (R): Power = Work / Time.

Reasoning Options

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Assertion-Reason

Check the statement and reason

A-R

Question 9

Logic Check

Assertion (A): A machine having more power completes more work in less time. Reason (R): Power is inversely proportional to time when work is constant.

Reasoning Options

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Assertion-Reason

Check the statement and reason

A-R

Question 10

Logic Check

Assertion (A): Kinetic energy of a moving object depends on both its mass and velocity. Reason (R): Kinetic Energy = ½ mv².

Reasoning Options

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Chapter sections

Chapter 10: Work and Energy | Assertion-Reason

Assertion (A): Work is said to be done only when a force is applied and the object gets displaced. Reason (R): Both force and displacement are necessary for scientific work to be done.

Assertion (A): A student studying hard and getting tired is doing scientific work. Reason (R): Scientific work is related to physical displacement caused by force.

Assertion (A): When an object does not move even after applying a force, no work is done. Reason (R): Work requires displacement of the object in the direction of force.

Assertion (A): Lifting a book involves positive work. Reason (R): The force applied and displacement of the book are in the same direction.

Assertion (A): Work done can be positive or negative. Reason (R): Work is positive when force and displacement are in the same direction and negative when they are opposite.

Assertion (A): Work done is a scalar quantity. Reason (R): It has magnitude but no specific direction.

Assertion (A): The unit of work is watt. Reason (R): One watt is equal to one newton meter per second.

Assertion (A): Power is defined as the rate of doing work. Reason (R): Power = Work / Time.

Assertion (A): A machine having more power completes more work in less time. Reason (R): Power is inversely proportional to time when work is constant.

Assertion (A): Kinetic energy of a moving object depends on both its mass and velocity. Reason (R): Kinetic Energy = ½ mv².

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