Work, Energy and Power Test

Result

Work, Energy and Power Test - 51

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Weekly Quiz Competition

Question 1
4 / -1

A ball of weight 0.1 kg coming with speed 30 m/s strikes with a bat and returns in opposite direction with speed 40 m/s, then the impulse is (Taking final velocity as positive)

A

B

C

D

Solution
Question 2
4 / -1

A billiard ball moving with a speed of 5 m/s collides with an identical ball originally at rest. If the first ball stops after collision, then the second ball will move forward with a speed of

A
10 ms^–1

B
5 ms^–1

C
2.5 ms^–1

D
1.0 ms^–1
Question 3
4 / -1

A ball of mass m falls vertically to the ground from a height h₁ and rebound to a height h₂. The change in momentum of the ball on striking the ground is

A

B

C

D

Solution
Question 4
4 / -1

A body of mass 50 kg is projected vertically upwards with velocity of 100 m/sec. 5 sec after this body breaks into 20 kg and 30 kg. If 20 kg piece travels upwards with 150 m/sec, then the velocity of other block will be

A
15 m/sec downwards

B
15 m/sec upwards

C
51 m/sec downwards

D
51 m/sec upwards

Solution
Question 5
4 / -1

A steel ball of radius 2 cm is at rest on a frictionless surface. Another ball of radius 4 cm moving at a velocity of 81 cm/sec collides elastically with first ball. After collision the smaller ball moves with speed of

A
81 cm/sec

B
63 cm/sec

C
144 cm/sec

D
None of these

Solution
Question 6
4 / -1

A ball is projected vertically down with an initial velocity from a height of 20 m onto a horizontal floor. During the impact it loses 50% of its energy and rebounds to the same height. The initial velocity of its projection is

A
20 ms^–1

B
15 ms^–1

C
10 ms^–1

D
5 ms^–1

Solution
Question 7
4 / -1

A ball hits a vertical wall horizontally at 10 m/s bounces back at 10 m/s

A

B
There may be an acceleration because its initial direction is horizontal

C
There is an acceleration because there is a momentum change

D
Even though there is no change in momentum there is a change in direction. Hence it has an acceleration
Question 8
4 / -1

A hail is allowed to fall from a height of 10 m. If there is 40% loss of energy due to impact, then after one impact ball will go up to

A
10 m

B
8 m

C
4 m

D
6 m

Solution
Question 9
4 / -1

A body of mass m₁ moving with a velocity 3 ms^–1 collides with another body at rest of mass m₂. After collision the velocities of the two bodies are 2 ms^–1 and 5 ms^–1 respectively along the direction of motion of m₁. The ratio m₁ / m₂.

A

B
5

C

D

Solution
Question 10
4 / -1

A body at rest breaks up into 3 parts. If 2 parts having equal masses fly off perpendicularly each after with a velocity of 12 m/s, then the velocity of the third part which has 3 times mass of each part is

A

B

C

D

Solution