Prelims Notes

DMPQ: The Indian Meteorological department confirmed that this month was coldest in Delhi since 1901. What are the Possible reasons for such cold waves?

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In Delhi, the average maximum temperature for December was less than 20°C until December 27. This has happened only four times in the last 118 years, and the IMD has said this month would most likely become the second coldest December for Delhi since 1901. A cold-day condition is said to prevail when the maximum … Read more DMPQ: The Indian Meteorological department confirmed that this month was coldest in Delhi since 1901. What are the Possible reasons for such cold waves?

SURDS

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Surds A surd is a square root which cannot be reduced to a rational number. For example,  is not a surd. However  is a surd. If you use a calculator, you will see that  and we will need to round the answer correct to a few decimal places. This makes it less accurate. If it is left as , then the … Read more SURDS

DMPQ- Recently ‘Green Crackers’ term was in the news. What do you understand by the term Green Crackers?

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They do not contain harmful chemicals that would cause air pollution.  Components are replaced with others that are less dangerous and less harmful to the atmosphere.  The idea was carried forward by a network of CSIR labs.  The team came up with 3-4 formulations and looked at 30-40% of active materials which reduce particulate matter.  … Read more DMPQ- Recently ‘Green Crackers’ term was in the news. What do you understand by the term Green Crackers?

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