Work, Energy and Power Test

Result

Work, Energy and Power Test - 22

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Weekly Quiz Competition

Question 1
4 / -1

Two solid rubber balls A and B having masses 200 & 400 gm respectively are moving in opposite direction with velocity of A equal to 0.3 m/sec. After collision, the two balls come to rest when the velocity of B is :

A
0.15 m/sec

B
1.5 m/sec

C
–0.15 m/sec

D
None of the above

Solution
Question 2
4 / -1

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

A

B

C

D

Solution
Question 3
4 / -1

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

A
move with different velocities in different directions

B
move with the same velocity in opposite directions

C
move with the same velocity in the same direction

D
be at rest
Question 4
4 / -1

If water falls from a dam into a turbine wheel 19.6 m below then velocity of water at turbine, is (Take g = 9.8 m/s²)

A
9.8 m/s

B
19.6 m/s

C
39.2 m/s

D
98.0 m/s

Solution
Question 5
4 / -1

A bomb of mass 1 kg is thrown vertically upwards with a speed of 100 m/s. After 5 seconds, it explodes into two fragments. One fragment of mass 400 gram is found to go down with a speed of 25 m/s. what will happen to the second fragment just after the explosion? (g = 10 m /s²)

A
it will go upwards with speed 100 m/s

B
it will go upwards with speed 40 m/s

C
it will go upwards with speed 60 m/s

D
it will go downwards with speed 40 m/s

Solution
Question 6
4 / -1

A spring of force constant 800 N/m has an extension of 5 cm. The work done in extending it from 5 cm to 15 cm is

A
16 J

B
8 J

C
32J

D
24 J

Solution
Question 7
4 / -1

A ball whose K.E. is E is projected at an angle of 45⁰ to the horizontal.The kinetic energy of the ball at the highest point of its flight will be

A
E

B
E / √2

C
E/2

D
zero

Solution
Question 8
4 / -1

The kinetic energy K of a particle moving in a straight line depends on the distance s as K = as². The force acting on the particle is

A
2 as

B
2 m as

C
2a

D
√as²
Question 9
4 / -1

A bullet is fired normally on a wooden plank, which is immovable. It loses 25% of its momentum in penetrating a thickness of 3.5 cm the total thickness penetrated by the bullet is

A
10 cm

B
8 cm

C
12 cm

D
14 cm

Solution
Question 10
4 / -1

A tennis ball falls freely from a height H on to an inclined smooth plane making an angle of 45⁰ with horizontal. After bouncing, the ball falls on the plane again. The distance between the two points where the ball strikes the plane is

A

B

C

D
H

Solution