Work, Energy and Power Test

Result

Work, Energy and Power Test - 59

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Weekly Quiz Competition

Question 1
4 / -1

A ball moves over a fixed track as shown in the figure. From A to B the ball rolls without slipping. Surface BC is frictionless. K_A, K_B and K_C arc kinetic energies of the ball at A, B and C, respectively, Then

A

B

C

D

Solution
Question 2
4 / -1

A

B

C

D

Solution
Question 3
4 / -1

A ball hits the floor and rebounds after an inelastic collision. In this case

A
The momentum of the ball just after the collision is the same as that just before the collision

B
The mechanical energy of the ball remains the same in the collision

C
The total momentum of the ball and the earth is conserved

D
The total energy of the ball and the earth is conserved
Question 4
4 / -1

A set of n identical cubical blocks lies at rest parallel to each other along a line on a smooth horizontal surface. The separation between the near surfaces of any two adjacent blocks is L. The block at one end is given a speed v towards the next one at time t = 0. All collisions are completely inelastic, then

A

B

C

D

Solution
Question 5
4 / -1

A point mass of 1. kg collides with a stationary point mass of 5 kg. After their collision, the 1 kg mass reverses its direction and moves with a speed of 2 ms^–1. Which of the following statement(s) is (are) correct for the system of these two masses?

A
Total momentum of the system is 3 kg ms^–1

B
Momentum of 5 kg mass after collision is 4 kg ms^–1

C
Kinetic energy of the centre of mass is 0.75 J

D
Total kinetic energy of the system is 4 J

Solution
Question 6
4 / -1

Statement I In an elastic collision between two bodies, the relative speed of the bodies after collision is equal to the relative speed before the collision.
Statement II In an elastic collision, the linear momentum of the system is conserved.

A
Statement I is true, statement II is true ; statement II is a correct explanation for statement I

B
Statement I is true, statement II is true ; statement II is not a correct explanation for statement I

C
Statement I is true, statement II is false

D
Statement I is false, statement II is true
Question 7
4 / -1

Statement I Two particles moving in the same direction do not lose all their energy in a completely inelastic collision.
Statement II Principle of conservation of momentum holds true for all kinds of collisions.

A
Statement I is true, statement II is true ; statement II is a correct explanation for statement I

B
Statement I is true, statement II is true ; statement II is not a correct explanation for statement I

C
Statement I is true, statement II is false

D
Statement I is false, statement II is true
Question 8
4 / -1

Statement I A block of mass m starts moving on a rough horizontal surface with a velocity v. It stops due to friction between the block and the surface after moving through a certain distance. The surface is now tilted to an angle of 300 with the horizontal and the same block is made to go up on the surface with the same initial velocity v. The decrease in the mechanical energy in the second situation is smaller than that in the first situation.
Statement II The coefficient of friction between the block and the surface decreases with the increase in the angle of inclination.

A
Statement I is true, statement II is true ; statement II is a correct explanation for statement I

B
Statement I is true, statement II is true ; statement II is not a correct explanation for statement I

C
Statement I is true, statement II is false

D
Statement I is false, statement II is true
Question 9
4 / -1

A small block of mass M moves on a frictionless surface of an inclined plane, as shown in figure. The angle of the incline suddenly changes from 60° to 30° at point B. The block is initially at rest at A. Assume that collisions between the block and the incline are totally inelastic (g = 10 m/s²).
The speed of the block at point B immediately after it strikes the second incline is

A

B

C

D

Solution
Question 10
4 / -1

A small block of mass M moves on a frictionless surface of an inclined plane, as shown in figure. The angle of the incline suddenly changes from 60° to 30° at point B. The block is initially at rest at A. Assume that collisions between the block and the incline are totally inelastic (g = 10 m/s²).
The speed of the block at point C, immediately before it leaves the second incline is

A

B

C

D

Solution