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1.
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Which of the following equations is correct?
( =
change in total energy of the object, W = work done on the object, Q =
heat absorbed by the object) |
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W = + Q |
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Q = + W |
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= W + Q |
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W = + Q / 2 |
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None of the above |
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2. |
Calculate the work done on a gas if one mole of the gas is heated and expanded from 24 litres to 25.2 litres at a pressure of 1.5 atm? |
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1.8 J |
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-1.8 J |
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181.8 J |
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-181.8 J |
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181800 J |
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3. |
Referring to Q2, if the amount of heat required to increase the temperature of the gas by 2 is 138.2 J, then the total internal energy change in the gas is |
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43.6 J |
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136.4 J |
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140 J |
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320 J |
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181938.2 J |
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4.
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Calculate the heat capacity of the gas in Q3. |
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43.6 J/K |
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69.1 J/K |
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136.4 J/K |
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280 J/K |
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90900 J/K |
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5. |
The unit of specific heat capacity is
(J = Joule, kg = kilogram, K = degree in Kelvin) |
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J/kg |
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J/(kgK) |
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JK/kg |
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Jkg/K |
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J/K |
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6. |
The unit of latent heat is
(J = Joule, kg = kilogram, K = degree in Kelvin) |
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J/kg |
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J/(kgK) |
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JK/kg |
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Jkg/K |
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J |
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7. |
A cup of water (about 250g) is heated and boiled off. If the amount of heat required to boil off the water is 0.56 MJ, the specific latent heat of boiling is
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0.00224 MJ/kg |
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0.14 MJ/kg |
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1.4 MJ/kg |
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2.24 MJ/kg |
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140 MJ/kg |
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8. |
Referring to Q7, if the work done on the water is -0.2 MJ, then the change in the internal energy in the process is: |
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-0.06 MJ |
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0.202 MJ |
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0.36 MJ |
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139.8 MJ |
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140.2 MJ |
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9. |
Which of the following statements is correct? |
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Energy on the earth is conserved and reusable |
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Energy on the earth is conserved but keep on degrading |
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Energy on the earth is not conserved because we are using up energy |
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Energy on the earth is not conserved because we extract new energy resources |
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Energy on the earth is not conserved because the earth is not a closed system |
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10. |
Which of the following energy resources does not come indirectly from the sun? |
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Petroleum |
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Coal |
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Nucleus energy |
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Wind power |
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Hydro power |
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