Work, Energy and Power Test

Result

Work, Energy and Power Test - 78

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Question 1
4 / -1

A uniform chain of length 2m is kept on a table such that a length of 50cm hangs freely from the edge of the table. The total mass of the chain is 5kg. What is the work done in pulling the entire chain on the table. (g = 10 m\s²)

A
7.2 J

B
3 J

C
4.6 J

D
120 J

Solution
Question 2
4 / -1

A cord is used to lower vertically a block of mass M by a distance d with constant down-word acceleration 9/2. Work done by the cord on the block is

A
– Mgd/2

B
Mgd/4

C
–3Mgd/4

D
Mgd

Solution
Question 3
4 / -1

A uniform chain of length L and mass M is lying on a smooth table and (1/4)^th of its length is hanging vertically down over the edge of the table. If g is acceleration due to gravity, the work required to pull the hanging part on to the table is

A
MgL

B
MgL/9

C
MgL/18

D
MgL/32

Solution
Question 4
4 / -1

An open knife edge of mass m is dropped from a height h on a wooden floor. If the blade penetrates upto the depth d into the wood, the average resistance offered by the wood to the knife edge is,

A
mg

B

C

D

Solution
Question 5
4 / -1

Velocity time graph of a particle of mass 2kg moving in a straight line is as shown in figure. Wrok done by all forces on the particle is

A
400 J

B
–400 J

C
–200 J

D
200 J

Solution
Question 6
4 / -1

A mass of M kg is suspended by a weight-less string, the horizontal force that is required to displace it until the string makes an angle of 60^o with the intial varticale direction is

A

B

C

D

Solution
Question 7
4 / -1

A force F = Ay² + By + C acts on a body in the y-direction. The work done by this force during a displacement from y = –a to y = a is

A

B

C

D
None of these

Solution
Question 8
4 / -1

A body having a mass of 0.5 kg slips along the wall of a semispherical smooth surface of radius 20 cm shown in figure.What is the velocity of body at the bottom of the surface ? (g = 10 m/s²)

A

B
2 m/s

C

D
4 m/s

Solution
Question 9
4 / -1

A particle is placed at the origin and a force F = kx is acting on it (Where K is positive constant) If Ucos = 0, which one of the following graph of U(x) versus x. (where U is the potential energy function)

A

B

C

D

Solution
Question 10
4 / -1

The potential energy of a projectile at its highest point is (1/2)^th the value of its initial kinetic energy. Therefore its angle of projection is ......

A
30^o

B
45^o

C
60^o

D
75^o

Solution