1. What is the SI unit of internal energy?
A.
Joule
B.
Watt
C.
Pascal
D.
Newton
Correct Answer:
Joule
Explanation:
Internal energy is a form of energy, and its SI unit is the joule (J).
2. Which symbol is commonly used for the SI unit of internal energy?
A.
W
B.
J
C.
N
D.
Pa
Correct Answer:
J
Explanation:
The symbol J represents the joule, the SI unit of internal energy.
3. How many joules are equal to 1 kilojoule?
A.
10 joules
B.
100 joules
C.
1000 joules
D.
10,000 joules
Correct Answer:
1000 joules
Explanation:
The prefix kilo means 1000, so 1 kJ equals 1000 J.
4. Which of the following is a suitable unit for measuring the internal energy of a large quantity of gas?
A.
Kilojoule
B.
Meter
C.
Kelvin
D.
Ampere
Correct Answer:
Kilojoule
Explanation:
Kilojoule is an energy unit and is suitable for expressing relatively large amounts of internal energy.
5. The dimensional formula of internal energy is the same as that of which quantity?
A.
Work
B.
Pressure
C.
Temperature
D.
Power
Correct Answer:
Work
Explanation:
Internal energy and work are both measured in joules, so they have the same dimensions.
6. Which unit is equal to one joule?
A.
Newton metre
B.
Newton per metre
C.
Pascal metre
D.
Watt per second
Correct Answer:
Newton metre
Explanation:
One joule is equal to one newton metre, so N m is an equivalent unit of internal energy.
7. Which of the following is not a unit of internal energy?
A.
Joule
B.
Kilojoule
C.
Calorie
D.
Kelvin
Correct Answer:
Kelvin
Explanation:
Kelvin is a unit of temperature, whereas joule, kilojoule, and calorie are units used for energy.
8. If the internal energy of a system is 5 kJ, what is its value in joules?
A.
50 J
B.
500 J
C.
5000 J
D.
50,000 J
Correct Answer:
5000 J
Explanation:
Since 1 kJ equals 1000 J, 5 kJ equals 5 × 1000 J, or 5000 J.
9. Which unit is commonly used to express the energy of a single particle?
A.
Electronvolt
B.
Kilogram
C.
Coulomb
D.
Tesla
Correct Answer:
Electronvolt
Explanation:
The electronvolt, or eV, is a unit of energy commonly used for very small amounts of energy, such as the energy of a particle.
10. What is the SI unit of specific internal energy?
A.
J/kg
B.
J/m
C.
kg/J
D.
N/kg
Correct Answer:
J/kg
Explanation:
Specific internal energy is internal energy per unit mass, so its SI unit is joule per kilogram (J/kg).
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