Work, Energy and Power Test

Result

Work, Energy and Power Test - 45

Score
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Weekly Quiz Competition

Question 1
4 / -1

Two bodies of masses 2 m and m have their K.E. in the ratio 8 : 1, then their ratio of momenta is

A
1 : 1

B
2 : 1

C
4 : 1

D
8 : 1

Solution
Question 2
4 / -1

A bomb of 12 kg divides in two parts whose ratio of masses is 1: 3. If kinetic energy of smaller part is 216 J, then momentum of bigger part in kg-m/sec will be

A
36

B
72

C
108

D
Data is incomplete

Solution
Question 3
4 / -1

A body at rest breaks into two pieces with unequal mass

A
Both of them have equal speeds

B
Both of them move along a same line with unequal speed

C
Sum of their momentum is non-zero

D
They move along different lines with different speeds.
Question 4
4 / -1

A particle is released from a height S. At certain height its kinetic energy is three times its potential energy. The height and speed of the particle at that instant are respectively

A

B

C

D

Solution
Question 5
4 / -1

Which among the following is a form of energy?

A
Light

B
Pressure

C
Momentum

D
Power
Question 6
4 / -1

If a body of mass 200 g falls from a height 200 m and its total P.E. is converted into K.E. at the point of contact of the body with Earth surface, then what is the decrease in P.E. of the body at the contact? (g = 10 m/s²)

A
200 J

B
400 J

C
600 J

D
900 J

Solution
Question 7
4 / -1

A bomb is kept stationary at a point. It suddenly explodes into two fragments of masses 1g and 3g. The total K.E. of the fragments is 6.4 x 10⁴ J. What is the K.E. of the smaller fragment?

A

B

C

D

Solution
Question 8
4 / -1

A

B

C

D

Solution
Question 9
4 / -1

The decrease in the potential energy of a ball of mass 20 kg which falls from a height of 50 cm is

A
968 J

B
98 J

C
1980 J

D
None of these

Solution
Question 10
4 / -1

If a man increase his speed by 2 m/s, his K.E. is doubled, the original speed of the man is

A

B

C

D

Solution