Chapter 5: Work, Energy and Power MCQs | physics Class 11 CBSE

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Chapter 5: Work, Energy and Power MCQs | physics Class 11 CBSE | ByteNotes.in

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Question 1

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The scalar product of two vectors A and B where θ is the angle between them is defined as:

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Question 2

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For two mutually perpendicular unit vectors î and ĵ, the value of î·ĵ is:

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Question 3

Objective

The scalar product satisfies which of the following laws?

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Question 4

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If two vectors A and B are perpendicular to each other, then A·B equals:

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Question 5

Objective

The work done by a force F on a body moving through displacement d is zero when:

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Question 6

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A weightlifter holds a 200 kg barbell stationary at shoulder height for 60 seconds. The work done by the weightlifter on the barbell during this time is:

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Question 7

Objective

The SI unit of work and energy is the joule (J). Its dimensional formula is:

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Question 8

Objective

The work-energy theorem states that the net work done on a particle equals:

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Question 9

Objective

Which of the following is NOT a condition for zero work done by a force?

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Question 10

Objective

A block of mass 2 kg has kinetic energy 100 J. Its speed is:

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Question 11

Objective

For a variable force, the work done is calculated as the area under the:

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Question 12

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A spring of spring constant k = 200 N/m is compressed by 0.05 m from its natural length. The elastic potential energy stored is:

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Question 13

Objective

The spring force Fs = −kx is a conservative force because:

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Question 14

Objective

At maximum compression of a spring in a frictionless spring-block collision, the kinetic energy of the block is:

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Question 15

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The gravitational potential energy of an object of mass m at height h above the earth's surface is V(h) = mgh. The gravitational force F in terms of V(h) is:

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Question 16

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The total mechanical energy of a system is conserved when:

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Question 17

Objective

A ball is dropped from height H on a frictionless surface. Its speed just before hitting the ground is:

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Question 18

Objective

Power is defined as the time rate of doing work. Its SI unit, the watt, is equal to:

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Question 19

Objective

The instantaneous power delivered by a force F to a body moving with instantaneous velocity v is:

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Question 20

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1 kilowatt hour (kWh) is equal to:

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Chapter 5: Work, Energy and Power | MCQs

The scalar product of two vectors A and B where θ is the angle between them is defined as:

For two mutually perpendicular unit vectors î and ĵ, the value of î·ĵ is:

The scalar product satisfies which of the following laws?

If two vectors A and B are perpendicular to each other, then A·B equals:

The work done by a force F on a body moving through displacement d is zero when:

A weightlifter holds a 200 kg barbell stationary at shoulder height for 60 seconds. The work done by the weightlifter on the barbell during this time is:

The SI unit of work and energy is the joule (J). Its dimensional formula is:

The work-energy theorem states that the net work done on a particle equals:

Which of the following is NOT a condition for zero work done by a force?

A block of mass 2 kg has kinetic energy 100 J. Its speed is:

For a variable force, the work done is calculated as the area under the:

A spring of spring constant k = 200 N/m is compressed by 0.05 m from its natural length. The elastic potential energy stored is:

The spring force Fs = −kx is a conservative force because:

At maximum compression of a spring in a frictionless spring-block collision, the kinetic energy of the block is:

The gravitational potential energy of an object of mass m at height h above the earth's surface is V(h) = mgh. The gravitational force F in terms of V(h) is:

The total mechanical energy of a system is conserved when:

A ball is dropped from height H on a frictionless surface. Its speed just before hitting the ground is:

Power is defined as the time rate of doing work. Its SI unit, the watt, is equal to:

The instantaneous power delivered by a force F to a body moving with instantaneous velocity v is:

1 kilowatt hour (kWh) is equal to:

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