Have an account?
Skip to Content
Build your own quiz
22 questions
Show Answers
See Preview
- 1. Multiple ChoiceThe unit of energy density of a fuel isJ m–2.J m–3.J kg–1.kg J–1.
- 2. Multiple ChoiceWhich of the following is the best estimate for the overall efficiency of a typical coal power station?5%30%60%90%
- 3. Multiple Choice
The power per unit length P of an oscillating water column (OWC) is due to the action of a surface wave of amplitude A.
Which of the following correctly relates P and A, and correctly identifies the nature of the energy of the water column?ABCD - 4. Multiple ChoiceThe average temperature of the surface of the Sun is about 20 times more than the average surface temperature of the Earth. The average power per unit area radiated by the Earth is P. The average power per unit area radiated by the Sun is20P.400P.8000 P.160 000 P.
- 5. Multiple ChoiceGlobal warming reduces the ice and snow cover on Earth. Which of the following correctly describes the changes in albedo and rate of energy absorption by Earth?ABCD
- 6. Multiple ChoiceThe efficiency of a modern natural gas power station is approximately10%50%75%90%
- 7. Multiple ChoiceThe rate of global warming might be reduced byreplacing the use of coal and oil with natural gas.a reduction in the Earth’s albedo.a reduction in carbon fixation.an increase in deforestation.
- 8. Multiple ChoiceGreenhouse gasesreflect infrared radiation but absorb ultraviolet radiation.reflect ultraviolet radiation but absorb infrared radiation.transmit infrared radiation but absorb ultraviolet radiation.transmit ultraviolet radiation but absorb infrared radiation.
- 9. Multiple ChoiceThe Sankey diagram shows a typical fossil-fuel plant of total efficiency 40 %. There are frictional, electrical transmission and energy losses to the lower temperature surroundings. Which branch represents the electrical energy arriving at the customer?ABCD
- 10. Multiple Choice
The absolute temperature of a black body increases by 2 %. What is the percentage increase in the power emitted by the black body?
2
4
8
16
- 11. Multiple ChoiceChanges in the climate are leading to a reduction in ice cover on Earth. Which of the following describes, for Earth, the change in albedo and the change in the rate of energy absorption?ABCD
- 12. Multiple ChoiceThe graph shows the emission spectrum for a black body at absolute temperature T1.
Which graph shows the emission spectrum for the same black body at an absolute temperature T2 where T2 > T1? The original graph is shown as a dotted line.ABCD - 13. Multiple ChoiceWhat is increased in a sample of uranium ore when nuclear fuel is enriched?ABCD
- 14. Multiple ChoiceIn the production of electric power, an advantage of using photovoltaic cells rather than fossil fuels is that the photovoltaic cellscan be effective in any location.can be used continuously.have low initial set-up costs.are more environmentally friendly when in use.
- 15. Multiple ChoiceA metal sphere X of radius R has an equilibrium surface temperature T. Another sphere Y made of the same metal has a radius R/2 and an equilibrium surface temperature 2T. What is the value of the ratio shown below?840.50.25
- 16. Multiple ChoiceWhich option is not a possible solution to reduce the enhanced greenhouse effect?Decommission nuclear power plantsReplace the use of coal and oil with natural gasUse combined heating and power (CHP) systemsUse hybrid motor vehicles
- 17. Multiple ChoiceWhat is the main role of the control rods and the main role of the moderator in a thermal fission reactor?ABCD
- 18. Multiple ChoiceAn oscillating water column (OWC) ocean-wave energy converter uses waves to alter the air pressure in a chamber. Which energy resources must have been involved for this method to generate electricity?
I. Tides
II. Wind
III. SolarI onlyII onlyI and II onlyII and III only - 19. Multiple ChoiceThe surface temperature of a black-body emitter is doubled. By what factor does the power emitted by the body increase?321642
- 20. Multiple ChoiceA black body of surface 1.0 m2 emits electromagnetic radiation of peak wavelength 2.90 × 10–6 m. Which of the following statements about the body are correct?
I. The temperature of the body is 1000 K.
II. The energy radiated by the body in one second is 5.7 × 104 J.
III. The body is a perfect absorber of electromagnetic radiation.I and II onlyI and III onlyII and III onlyI, II and III - 21. Multiple ChoiceWhat is the correct order of energy transformations in a coal power station?thermal → chemical → kinetic → electricalchemical → thermal → kinetic → electricalchemical → kinetic → thermal → electricalkinetic → chemical → electrical → thermal
- 22. Multiple ChoiceA solar panel has surface area 0.40 m2 and efficiency 50%. The average intensity of radiation reaching the surface of the panel is 0.25 kWm–2. What is the average power output from an array of 10 of these solar panels?0.5 W5.0 W50 W500 W
- Answer choicesTagsAnswer choicesTags