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This mock test of Work, Power And Energy MCQ Level - 1 for IIT JAM helps you for every IIT JAM entrance exam.
This contains 10 Multiple Choice Questions for IIT JAM Work, Power And Energy MCQ Level - 1 (mcq) to study with solutions a complete question bank.
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QUESTION: 1

A ring of mass * m* can slide over a smooth vertical rod. The ring is connected to a spring of force constant

Solution:

The correct answer is: the velocity of the ring when it reaches the ground will be

QUESTION: 2

A body is dropped from a certain height. When it loses * U* amount of its energy it acquires a velocity

Solution:

The correct answer is:

QUESTION: 3

A body is moved along a straight line by a machine delivering a constant power. The distance moved by the body in time * t* is proportional to :

Solution:

The correct answer is: t^{3/2}

QUESTION: 4

A self propelled vehicle of mass * m* whose engine delivers constant power

Solution:

The correct answer is:

QUESTION: 5

A block attached to a spring, pulled by a constant horizontal force, is kept on a smooth surface as shown in the figure. Initially, the spring is in the natural state. Then the maximum positive work that the applied force * F* can do is :

[Given that spring does not break]

Solution:

Applying work-energy theorem on the block, we get

Fl − kt^{2}/2 = 0

l = 2F/k

or work done = Fl = 2F^{2}/k

QUESTION: 6

A block of mass * m* is attached to two unstretched springs of spring constants

Solution:

The correct answer is:

QUESTION: 7

The block of mass * m* initially at

Solution:

The correct answer is:

QUESTION: 8

A man places a chain (of mass ** m** and length

Solution:

The work done by man is negative of magnitude of decrease in potential energy of chain

The correct answer is:

QUESTION: 9

A body is projected with kinetic energy * k* at angle with the vertical. Neglecting friction, its potential energy at the highest point will be :

Solution:

KE + PE = k

The correct answer is:

QUESTION: 10

In the Figure, the ball *A* is released from rest when the spring is at its natural length. For the block *B* of mass ** M** to leave contact with the ground of some stage, the minimum mass of

Solution:

Let * m* be minimum mass of ball

Let mass

From conservation of energy

For mass* *** M ** to leave contact with ground,

The correct answer is: *M*/2

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