D. Short question answer :-1. Calculate the pressure exerted by a sail on water if the force applied by the sail is50,000 N and the surface area of the sail is 250 m2.2. What is an ignition temperature ?3. Sodium and potassium are stored in kerosene. Why?4. Name & define the process responsible for the growth of an organism ?

D. Short question answer :-1. Calculate the pressure exerted by a sail

1.	D. Short question answer :-1. Calculate the pressure exerted by a sail on water if the force applied by the sail is50,000 N and the surface area of the sail is 250 m2.2. What is an ignition temperature ?3. Sodium and potassium are stored in kerosene. Why?4. Name & define the process responsible for the growth of an organism ?
Answer» <html><body><p><strong>Answer:</strong></p><p>2)The autoignition temperature or kindling point of a substance is the lowest temperature in which it spontaneously ignites in normal atmosphere without an external source of ignition, such as a <a href="https://interviewquestions.tuteehub.com/tag/flame-992254" style="font-weight:bold;" target="_blank" title="Click to know more about FLAME">FLAME</a> or <a href="https://interviewquestions.tuteehub.com/tag/spark-1219999" style="font-weight:bold;" target="_blank" title="Click to know more about SPARK">SPARK</a>. ... The ignition temperature of a substance is the least temperature at which the substance starts combustion.</p><p>3)Sodium and Potassium are <a href="https://interviewquestions.tuteehub.com/tag/highly-2102664" style="font-weight:bold;" target="_blank" title="Click to know more about HIGHLY">HIGHLY</a> reactive metals and react vigorously with the oxygen, carbon dioxide and moisture present in the air such that it may even cause a fire. To prevent this explosive reaction, Sodium is kept immersed in kerosene because Sodium doesn't react with kerosene.</p><p>4)The increase in size and changes in <a href="https://interviewquestions.tuteehub.com/tag/shape-1204673" style="font-weight:bold;" target="_blank" title="Click to know more about SHAPE">SHAPE</a> of a developing organism depend on the increase in the <a href="https://interviewquestions.tuteehub.com/tag/number-582134" style="font-weight:bold;" target="_blank" title="Click to know more about NUMBER">NUMBER</a> and size of cells that make up the individual. Increase in cell number occurs by a precise cellular reproductive mechanism called mitosis. Mitosis is the process responsible for the growth of an organism.</p></body></html>

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