Work, Energy and Power Test

Result

Work, Energy and Power Test - 28

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Weekly Quiz Competition

Question 1
4 / -1

A body moving with velocity v has momentum and kinetic energy numerically equal. What is the value of v

A
2 m/s

B
√2 m/s

C
1 m/s

D
0.2 m/s

Solution
Question 2
4 / -1

If the momentum of a body is increased by 100%, then the percentage increase in the kinetic energy is

A
150%

B
200%

C
225%

D
300%

Solution
Question 3
4 / -1

Four particles given, have same momentum. Which has maximum kinetic energy

A
Proton

B
Electron

C
Deutron

D
α-particles

Solution
Question 4
4 / -1

A machine which is 75 percent efficient, uses 12 joules of energy in lifting up a 1 kg mass through a certain distance. The mass is then allowed to fall through that distance. The velocity at the end of its fall is (in m/s^-1)

A

B

C

D

Solution
Question 5
4 / -1

The kinetic energy of a body of mass 3 Kg and momentum 2 Ns is

A
1 J

B

C

D
4J

Solution
Question 6
4 / -1

A ball of mass 2 kg and another of mass 4kg are dropped together from a 60 feet tall building. After a fall of 30 feet each towards earth, their respective kinetic energies will be in the ratio of

A

B
1 : 4

C
1 : 2

D

Solution
Question 7
4 / -1

The coefficient of restitution e for a perfectly elastic collision is

A
1

B
0

C
∞

D
–1
Question 8
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 balls 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 the above

Solution
Question 9
4 / -1

A body of mass `M\' collides against a wall with a velocity v and retraces its path with the same speed. The change in momentum is (take initial direction of velocity as positive)

A
zero

B
2Mv

C
Mv

D
–2Mv

Solution
Question 10
4 / -1

In an elastic collision of two particles the following is conserved

A
Momentum of each particle

B
Speed of each particle

C
Kinetic energy of each particle

D
Total kinetic energy of both the particles