Energy Types

Question 1
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Which of the following process P-V work in highest?
Second derivative is negative
Second derivative is positive
Second derivative is zero
All of the mentioned
Explanation:
Work in highest when the area under the P-V curve is highest, which is when the second derivative of the curve is negative.
Question 2
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A piston cylinder expands with some pressure, what is the work done by the system?
Positive
Negative
Zero
Cannot Say
Explanation:
Since direction of displacement and force are same, work done will be positive.
Question 3
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A piston cylinder contracts from 10 Liter to 5 Liter with an external pressure of 10 Pa, what is the work done on the system?
0.5 mJ
5 mJ
10 mJ
50 mJ
Explanation:
Work = 10*(10 – 5) = 50 mJ.
Question 4
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A piston cylinder expands from 8 liter to 12 liter with the external pressure of 900 Pa, what is the work done on the system?
3.6 Joule
– 3.6 Joule
7.2 Joule
– 7.2 Joule
Explanation:
Work done on the system = 900(8 – 12) = – 3600 mJ = – 3.6 J.
Question 5
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An object is moved at a distance of 10 m with the force of 5 N, what is the work done by the force?
5 Joule
50 Joule
500 Joule
5000 Joule
Explanation:
Work = 10*5 = 50 N-m = 50 Joule.
Question 6
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An object is moved from one position to another with a specific force, what type of work is it?
Shaft Work
Flow Work
Mechanical Work
None of the mentioned
Explanation:
Since work is caused by mechanical force it is a mechanical work.
Question 7
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A piston cylinder expands from 7 liter to 15 liter with the external pressure of 500 Pa, what is the work done by the system?
– 1.5 Joule
– 4 Joule
1.5 Joule
4 Joule
Explanation:
Work = 500*(15 – 7) = 4000 mJ = 4 Joule.
Question 8
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An object moved forward 10 meters and then comes back 5 meter all with a constant force of 5 N, what is the work done by the force?
5 Joule
25 Joule
50 Joule
75 Joule
Explanation:
Work = (10 – 5)* 5 = 25 Joule.
Question 9
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A piston cylinder is compressed with some pressure, what is the work done on the system?
Positive
Negative
Zero
Cannot say
Explanation:
Since pressure and displacement are positive their products are also positive, => work done on the system is positive.
Question 10
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Which of the following is not the type of energy?
Enthalpy
Heat
Entropy
Work
Explanation:
Entropy is not a type of energy.