Work, Energy and Power Test

Result

Work, Energy and Power Test - 42

Score
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Weekly Quiz Competition

Question 1
4 / -1

When a 1.0 kg mass hangs attached to a spring of length 50 cm, the spring stretches by 2 cm. The mass is pulled down until the length of the spring becomes 60 cm. What is the amount of elastic energy stored in the spring in this condition, if g l0 m/s²?

A
1.5 J

B
2.0 J

C
2.5 J

D
3.0 J

Solution
Question 2
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
32 J

D
24 J

Solution
Question 3
4 / -1

When a spring is stretched by 2 cm, it stores 100 J of energy. If it is stretched further by 2 cm, the stored energy will be increased by

A
100 J

B
200 J

C
300 J

D
400 J

Solution
Question 4
4 / -1

A spring when stretched by 2 mm its potential energy becomes 4 J. If it is stretched by 10 mm, its potential energy is equal to

A
4 J

B
54 J

C
415 J

D
None of these

Solution
Question 5
4 / -1

A
6.25 N-m

B
12.50 N-m

C
18.75 N-m

D
25.00 N-m

Solution
Question 6
4 / -1

A particle moves in a straight line with retardation proportional to its displacement. Its loss of kinetic energy for any displacement x is proportional to

A

B

C

D

Solution
Question 7
4 / -1

Natural length of a spring is 60 cm, and its spring constant is 4000 N/m. A mass of 20 kg is hung from it. The extension produced in the spring is, (Take g = 9.8 m/s²)

A
4.9 cm

B
0.49 cm

C
9.4 cm

D
0.94 cm

Solution
Question 8
4 / -1

The potential energy of a body is given by, U = A – Bx² (where x is the displacement). The magnitude of force acting on the particle is

A
Constant

B
Proportional to x

C
Proportional to x²

D
Inversely proportional to x

Solution
Question 9
4 / -1

A

B

C

D

Solution
Question 10
4 / -1

A rod AB of mass 10 kg and length 4 m rests on a horizontal floor with end A fixed so as to rotate it in vertical plane about perpendicular axis passing through A. If the work done on the rod is 100 J, the height to which the end B be raised vertically above the floor is

A
1.5 m

B
2.0 m

C
1.0 m

D
2.5 m

Solution