Work, Energy and Power Test

Result

Work, Energy and Power Test - 49

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Weekly Quiz Competition

Question 1
4 / -1

A sphere of mass m moving with a constant velocity u hits another stationary sphere of the same mass. If e is the coefficient of restitution, then the ratio of the velocity of two spheres after collision will be

A

B

C

D
Question 2
4 / -1

Two solid rubber balls A and B having masses 200 and 400 g respectively are moving in opposite directions with velocity of A equal to 0.3 m/s. After collision the two halls come to rest, then the velocity of B is

A
0.15 m/sec

B
1.5 m/sec

C
–0.15 m/sec

D
None of these

Solution
Question 3
4 / -1

A shell of mass 20 kg at rest explodes into two fragments whose masses are in the ratio 2 : 3. The smaller fragment moves with a velocity of 6 ms^–1. The kinetic energy of the larger fragment is

A
96 J

B
216 J

C
144 J

D
360 J

Solution
Question 4
4 / -1

A canon ball is fired with a velocity 200 m/sec at an angle of 60^o with the horizontal. At the highest point of its flight it explodes into 3 equal fragments, one going vertically upwards with a velocity 100 m/sec, the second one falling vertically downwards with a velocity 100 m/sec. The third fragment will be moving with a velocity

A
100 m/s in the horizontal direction

B
300 m/s in the horizontal direction

C
300 m/s in a direction making an angle of 60° with the horizontal

D
200 m/s in a direction making an angle of 60° with the horizontal

Solution
Question 5
4 / -1

A lead hail strikes a wall and falls down, a tennis ball having the same mass and velocity strikes the wall and bounces back. Check the correct statement

A
The momentum of the lead ball is greater than that of the tennis ball

B
The lead ball suffers a greater change in momentum compared with the tennis ball

C
The tennis ball suffers a greater change in momentum as compared with the lead ball

D
Both suffer an equal change in momentum

Solution
Question 6
4 / -1

When two bodies collide elastically, then

A
Kinetic energy of the system alone is conserved

B
Only momentum is conserved

C
Both energy and momentum are conserved

D
Neither energy nor momentum is conserved
Question 7
4 / -1

Two balls at same temperature collide. What is conserved?

A
Temperature

B
Velocity

C
Kinetic energy

D
Momentum
Question 8
4 / -1

An intense stream of water of cross-sectional area A strikes a wall at an angle θ with the normal to the wall and returns back elastically. If the density of water is ρ and its velocity is v, then the force exerted in the wall will be

A

B

C

D

Solution
Question 9
4 / -1

A sphere collides with another sphere of identical mass. After collision, the two spheres move. The collision is inelastic. Then, the angle between the directions of the two spheres is

A
90^o

B
0^o

C
45^o

D
Different from 90^o
Question 10
4 / -1

A ²³⁸U nucleus decays by emitting an alpha particle of speed v ms^–1. The recoil speed of the residual nucleus is (in ms^–1)

A
–4v/234

B
v/4

C
–4v/238

D
4v/238

Solution