Work, Energy and Power Test

Result

Work, Energy and Power Test - 69

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Weekly Quiz Competition

Question 1
4 / -1

A bomb of mass 3.0 kg explodes in air into two pieces of masses 2.0 kg and 1.0 kg. The smaller mass goes at a speed of 80 m/s. The total energy imparted to the two fragments is

A
1.07 kJ

B
2.14 kJ

C
2.4 kJ

D
4.8 kJ

Solution
Question 2
4 / -1

The spheres A and B masses m₁ and m₂ respectively collide. A is at rest initially and B is moving with velocity v along x-axis, After collision B has a velocity v/2 in a direction perpendicular to the original direction.The mass A moves after collision in the direction

A
Same as that of B

B
Opposite to that of B

C
θ = tan^–1 (1 / 2) to the x-axis

D
θ = tan^–1 (–1 / 2) to the x-axis

Solution
Question 3
4 / -1

A shell initially at rest explodes into two pieces of equal mass, then the two pieces will

A
Be at rest

B
Move with different velocities in different directions

C
Move with the same velocity in opposite directions

D
Move with the same velocity in same direction
Question 4
4 / -1

A lead ball 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 5
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 6
4 / -1

A gun fires a bullet of mass 50 g with a velocity of 30 m sec^–1. Because of this the gun is pushed back with a velocity of 1 m sec^–1. The mass of the gun is

A
15 kg

B
30 kg

C
1.5 kg

D
20 kg

Solution
Question 7
4 / -1

A smooth sphere of mass M moving with velocity u directly collides elastically with another sphere of mass m at rest. After collision their final velocities are V and v respectively . The value of v is

A

B

C

D

Solution
Question 8
4 / -1

A body of mass m having an initial velocity v, makes head on collision with a stationary body of mass M. After the collision, the body of mass m comes to rest and only the body having mass M moves. This will happen only when

A
m >> M

B
m << M

C
m = M

D
Question 9
4 / -1

A particle of mass m moving with horizontal speed 6 m/sec as shown in figure. If m << M then for one dimensional elastic collision, the speed of lighter particle after collision will be

A
2 m/sec in original direction

B
2 m/sec opposite to the original direction

C
4 m/sec opposite to the original direction

D
4 m/sec in original direction

Solution
Question 10
4 / -1

A shell of mass m moving with velocity v suddenly breaks into 2 pieces. The part having mass m/4 remains stationary. The velocity of the other shell will be

A
v

B
2v

C

D

Solution