1. The Sankey diagram shows the energy input from fuel that is eventually converted to useful domestic energy in the form of light in a filament lamp.

What is true for this Sankey diagram?

 
2. The dashed line on the graph shows the variation with wavelength of the intensity of solar radiation before passing through the Earth’s atmosphere. The solid line on the graph shows the variation with wavelength of the intensity of solar radiation after it has passed through the Earth’s atmosphere.

                      

Which feature of the graph helps explain the greenhouse effect?

 
3. Which of the following describes the role of the atmosphere in the greenhouse effect?
 
4. A nuclear reactor contains atoms that are used for moderation and atoms that are used for control.

What are the ideal properties of the moderator atoms and the control atoms in terms of neutron absorption?

 
5. The solar constant is the intensity of the Sun’s radiation at
 
6. A black body has absolute temperature T and surface area A. The intensity of the radiation emitted by the body is I. Another black body of surface area 2A has absolute temperature 2T. What is the intensity of radiation emitted by this second black body?
 
7. The average albedo of glacier ice is 0.25.

 
8. In a hydroelectric power plant,

water of density 103kgm–3 falls through an average height of 100m. The volume of water flowing through the pipes per second is 10m3s–1. What is the maximum power generated?

 
9. In a nuclear power station, in order to increase the chances of a chain reaction
 
10. What part of a nuclear power station is principally responsible for increasing the chance that a neutron will cause fission?
 
11. The rate of formation of a non-renewable energy resource is
 
12. World energy resources include coal, nuclear fuel and geothermal energy. Which of the following lists these resources in order of energy use in the world?
 
13. In the production of electric power, an advantage of using photovoltaic cells rather than fossil fuels is that the photovoltaic cells
 
14. Which option is not a possible solution to reduce the enhanced greenhouse effect?
 
15. In a nuclear fission reactor, the role of the moderator is to
 
16. X and Y are two spherical black-body radiators that emit the same total power. The absolute temperature of X is half that of Y.

 

 
17. Methane and carbon dioxide are both greenhouse gases that are believed to cause global warming. The reason for this is that these gases
 
18. Kindly refer the question below:

A body X of emissivity e is at temperature T1. X is inside a box whose walls act as a black body of temperature T2T1 is greater than T2.

                       

What is the net intensity of radiation leaving body X?

 
19. An object can lose energy through

I.    conduction
II.   convection
III.  radiation

What are the principal means for losing energy for a hot rock resting on the surface of the Moon?

 
20. Which of the following statements, relating to the production of nuclear power, is correct?
 
21. Changes 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?

 
22. The graph shows the variation with wavelength of intensity of radiation emitted by two bodies X and Y. X and Y have the same surface area.

How do the temperature and the emissivity of X compare with the temperature and the emissivity of Y?

 
23. Kindly refer the question below:

The 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.