Work, Energy and Power Test

Result

Work, Energy and Power Test - 63

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Weekly Quiz Competition

Question 1
4 / -1

The slope of kinetic energy displacement curve of a particle in motion is

A
Equal to the acceleration of the particle

B
Inversely proportional to the acceleration

C
Directly proportional to the acceleration

D
None of the above

Solution
Question 2
4 / -1

The energy required to accelerate a car from 10 m/s to 20 m/s is how many times the energy required to accelerate the car from rest to 10 m/s

A
Equal

B
4 times

C
2 times

D
3 times

Solution
Question 3
4 / -1

A body of mass 2 kg slides down a curved track which is quadrant of a circle of radius 1 m. All the surfaces are frictionless. if the body starts from rest, its speed at the bottom of the track is

A
4.43 m/sec

B
2 m/sec

C
0.5 m/sec

D
19.6 m/sec
Question 4
4 / -1

A ball moving with speed v hits another identical ball at rest. The two balls stick together after collision. If specific heat of the material of the balls is S, the temperature rise resulting from the collision is

A

B

C

D

Solution
Question 5
4 / -1

A bomb of mass 3 m kg explodes into two pieces of mass m kg and 2 m kg. If the velocity of m kg mass is 16 m/s. the total kinetic energy released in the explosion is

A
192 mJ

B
96 mJ

C
384 mJ

D
768 mJ

Solution
Question 6
4 / -1

Which one of the following statement does not hold good when two balls of masses m₁ and m₂ undergo elastic collision

A
When m₁ << m₂ and m₂ at rest, there will be maximum transfer of momentum

B
When m₁ >> m₂ and m₂ at rest, after collision the ball of mass m₂ moves with four times the velocity of

C
When m₁ = m₂ and m₂ at rest, there will be maximum transfer of K.E.

D
When collision is oblique and m₂ at rest with m₁ = m₂, after collision the balls move in opposite directions
Question 7
4 / -1

A neutron travelling with a velocity v and K.E. E collides perfectly elastically head on with the nucleus of an atom of mass number A at rest. The fraction of total energy retained by neutron is

A

B

C

D

Solution
Question 8
4 / -1

A
0.75

B
1.33

C
3.0

D
4.0

Solution
Question 9
4 / -1

Six identical balls are lined in a straight groove made on a horizontal frictionless surface as shown. Two similar balls each moving with a velocity v collide elastically with the row of 6 balls from left. What will happen

A
One ball from the right rolls out with a speed 2v and the remaining balls will remains at rest

B
Two ball from the right roll will out with speed v each and the remaining balls will remain stationary

C
All the six balls in the row will roll out with speed v/6 each and the two colliding balls will come to rest

D
The colliding balls will come to rest and no ball roll out from right.
Question 10
4 / -1

A wooden block of mass M rests on a horizontal surface. A bullet of mass m moving in the horizontal direction strikes and gets embedded in it. The combined system covers a distance x on the surface. If the coefficient of friction between wood and the surface is μ, the speed of the bullet at the time of striking the block is (where m is mass of the bullet)

A

B

C

D

Solution