Work, Energy and Power Test

Result

Work, Energy and Power Test - 29

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Weekly Quiz Competition

Question 1
4 / -1

A body falling from a height of 10 m rebounds from hard floor. If it loses 20% energy in the impact, then coefficient of restitution is

A
0.89

B
0.56

C
0.23

D
0.18

Solution
Question 2
4 / -1

A neutron makes a head-on elastic collision with a stationary deuteron. The fractional energy loss of the neutron in the collision is

A
16/81

B
8/9

C
8/27

D
2/3

Solution
Question 3
4 / -1

A uniform chain of length L and mass M is lying on a smooth table and one third of its length is hanging vertically down over the edge of the table. If g is acceleration due to gravity, the work required to pull the hanging part on to the table is

A
MgL

B
MgL/3

C
MgL/9

D
MgL/18

Solution
Question 4
4 / -1

A lorry and a car moving with the same K.E. are brought to rest by applying the same retarding force, then

A
Lorry will come to rest in a shorter distance

B
Car will come to rest in a shorter distance

C
Both come to rest in a same distance

D
None of the above

Solution
Question 5
4 / -1

The kinetic energy acquired by a mass m in travelling a certain distance d starting from rest under the action of a constant force is directly proportional to

A

B
Independent of m

C

D
m

Solution
Question 6
4 / -1

A body is moved along a stright line by a machine delivering constant power. The distance moved by the body in time t is proportional to

A
t^1/2

B
t^3/4

C
t^3/2

D
t²

Solution
Question 7
4 / -1

A shell of mass 200 gm is ejected from a gun of mass 4 kg by an explosion that generates 1.05 kJ or energy. The initial velocity of the shell is

A
40 ms^–1

B
120 ms^–1

C
100 ms^–1

D
80 ms^–1

Solution
Question 8
4 / -1

The coefficient of restitution e for a perfectly inelastic collision is

A
1

B
0

C
∞

D
–1
Question 9
4 / -1

A 50 g bullet moving with velocity 10 m/s strikes a block of mass 950 g at rest and gets embedded in it. The loss in kinetic energy will be

A
100%

B
95 %

C
5%

D
50%

Solution
Question 10
4 / -1

A particle of mass m moving with velocity v striles a stationary particle of mass 2m and sticks to it. The speed of the system will be

A
v/2

B
2v

C
v/3

D
3v

Solution