Work, Energy and Power Test

Result

Work, Energy and Power Test - 68

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
4 / -1

A rifle bullet loses 1/20^th of its velocity in passing through a plank. The least number of such planks required just to stop the bullet is

A
5

B
10

C
11

D
20

Solution
Question 2
4 / -1

A light and a heavy body have equal kinetic energy. Which one has a greater momentum

A
The light body

B
The heavy body

C
Both have equal momentum

D
It is not possible to say anything without additional information

Solution
Question 3
4 / -1

A spherical ball of mass 20 kg is stationary at the top of a hill of height 100 m. It slides down a smooth surface to the ground, then climbs up another hill of height 30 m and finally slides down to a horizontal base at a height of 20 m above the ground. The velocity attained by the ball is

A
10 m/s

B
10√30 m/s

C
40 m/s

D
20 m/s

Solution
Question 4
4 / -1

The force constant of a weightless spring is 16 N/m. A body of mass 1.0 kg suspended from it is pulled down through 5 cm and then released. The maximum kinetic energy of the system (spring + body) will be

A
2 × 10^–2 J

B
4 × 10^–2 J

C
8 × 10^–2 J

D
16 × 10^–2 J

Solution
Question 5
4 / -1

If the kinetic energy of a body becomes four times of its initial value, then new momentum will

A
Becomes twice its initial value

B
Becomes three times its initial value

C
Become four times its initial value

D
Remains constant

Solution
Question 6
4 / -1

A bomb is 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 7
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 8
4 / -1

A

B

C

D

Solution
Question 9
4 / -1

An ice cream has a marked value of 700 kcal. How many kilowatt-hour of energy will it deliver to the body as it is digested

A
0.81 kWh

B
0.90 kWh

C
1.11 kWh

D
0.71 kWh

Solution
Question 10
4 / -1

A stationary particle explodes into two particles of a masses m₁ and m₂ which move in opposite directions with velocities v₁ and v₂. The ratio of their kinetic energies E₁ / E₂ is

A
m₁ / m₂

B
1

C
m₁ v₂/m₂ v₁

D
m₂/m₁

Solution