UPSC Government Jobs Exams

Consider the following:
1. Carbon dioxide
2. Oxides of Nitrogen
3. Oxides of Sulphur
Which of the above is/are the emission/emissions from coal combustion at thermal power plants? [UPSC 2011 (CS-P)]

1 only
2 and 3 only
1 and 3 only
1, 2 and 3

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UPSC Other Question
Consider the following which can be found in the ambient atmosphere:
1. Soot
2. Sulphur hexafluoride
3. Water vapour
Which of the above contribute to the warming up of the atmosphere? [UPSC 2010 (CS-P)]

1 and 2 only
3 only
2 and 3 only
1, 2 and 3 Consider the following:
1. Photosynthesis
2. Respiration
3. Decay of organic matter
4. Volcanic action
Which of the above add carbon dioxide to the carbon cycle on Earth? UPSC 2011 (CS-P)

1 and 4 only
2 and 3 only
2, 3 and 4 only
1, 2, 3 and 4