Consider the following statements:
Statement-I: The temperature contrast between continents and oceans is greater during summer than in winter.
Statement-II: The specific heat of water is more than that of land surface.
Which one of the following is correct in respect of the above statements?
The correct answer is (D) Statement-I is incorrect but Statement-II is correct.
Explanation:
Statement 1 is incorrect: The statement is incorrect because the temperature contrast between continents and oceans is greater during winter, not summer. Statement 2 is correct: This statement is true. Specific heat refers to the amount of heat energy needed to raise the temperature of a substance by a certain amount. Water has a higher specific heat compared to land surfaces, meaning it requires more heat energy to raise its temperature compared to an equal mass of land. This is due to water's molecular structure and hydrogen bonding, which allow it to absorb and store a significant amount of heat energy. Explanation: The higher specific heat of water (Statement 2) explains the temperature contrast between continents and oceans, but primarily during winter, not summer as mentioned in Statement 1. Land surfaces heat up quickly due to their lower specific heat, causing land temperatures to rise rapidly during summer. In contrast, the ocean heats up more slowly due to its higher specific heat, absorbing and storing more heat energy. While this does create temperature differences between land and ocean, the contrast is more pronounced in winter when the land cools faster than the ocean.
हिंदी में प्रश्न एवं आदर्श उत्तर
निम्नलिखित कथनों पर विचार कीजिए :
कथन-I : ग्रीष्म ऋतु में महाद्वीपों और महासागरों के बीच तापमान विपर्यास शीत ऋतु की अपेक्षा अधिक होता है।
कथन-II : जल की विशिष्ट ऊष्मा, भूपृष्ठ की विशिष्ट ऊष्मा की अपेक्षा अधिक होती है।
उपर्युक्त कथनों के बारे में, निम्नलिखित में से कौन-सा एक सही है?
सही उत्तर (D) Statement-I is incorrect but Statement-II is correct है।
व्याख्या:
Statement 1 is incorrect: The statement is incorrect because the temperature contrast between continents and oceans is greater during winter, not summer. Statement 2 is correct: This statement is true. Specific heat refers to the amount of heat energy needed to raise the temperature of a substance by a certain amount. Water has a higher specific heat compared to land surfaces, meaning it requires more heat energy to raise its temperature compared to an equal mass of land. This is due to water's molecular structure and hydrogen bonding, which allow it to absorb and store a significant amount of heat energy. Explanation: The higher specific heat of water (Statement 2) explains the temperature contrast between continents and oceans, but primarily during winter, not summer as mentioned in Statement 1. Land surfaces heat up quickly due to their lower specific heat, causing land temperatures to rise rapidly during summer. In contrast, the ocean heats up more slowly due to its higher specific heat, absorbing and storing more heat energy. While this does create temperature differences between land and ocean, the contrast is more pronounced in winter when the land cools faster than the ocean.