Telangana SCERT Class 8 Social Studies Solution Chapter 2 Energy from the Sun

Telangana SCERT Solution Class VIII (8) Social Studies Chapter 2 Energy from the Sun.

1.) Correct the false statements –

(a) If a place is closer to the sea, irrespective of its distance from equator, it will always be cooler.

Answer

True

It’s because cool breeze that blows through the regions of the sea will have the great impact on the place which is close to the sea  irrespective of its distance from Equator.

(b) As you go up higher from the earth, it becomes warmer because sun is closer to  you.

Answer

False

It’s because when you go up higher from the earth, it becomes cooler temperature decreases at the rate of 6°C for every ascent of 1000 metres.

(c) Sun heats the air first and then the earth.

Answer

False

It is because the sun heats the earth which later begins to radiate heat which heats up the air around you.

(d) Global warming is related to oxygen.

Answer

False

If carbon dioxide proportion in the atmosphere increases then less heat will be radiated causing an increase in global temperatures. Hence global warming is related to carbon not oxygen.

2.) What is the difference between the highest temperature in Table 2 and the lowest temperature in Table 1?

Answer

The highest temperature in Table 2 is 33°C and lowest temperature in Table 1 is   15°C. The difference between the highest temperatureand the lowest temperature is 18°C

3.) Suppose, the temperature in Moscow was –8°C at 10 AM on 6 December. Twenty-four hours later, it was 12°C higher. What was the temperature at 10 AM on 7 December?

Answer

As per the given question we can see we have the temperature of 6th December which –8°C at 10 AM and after 24 hours the temperature rises by more 12°C which brings the temperature to –20°C on 7th December.

 4.) Delhi and Mumbai are both situated on plains and their height above sea level is less than 300 meters. Why is there so much difference in their monthly average temperatures? In which months are the average temperatures in these two cities most similar? Explain

Answer

Mumbai is  located near a sea which ensures moderate temperature as  the sea doesn’t get too hot or cold due to the sun heats, the air above the sea also doesn’t get too hot or cold and Delhi is located  far away from  sea which gives it an extreme type of climate as the sun heats the ground and this heat rises up the air.

The average temperatures in these two cities are most similar in the month of August and September.

5.) Given below are the average monthly minimum and maximum temperatures of Jodhpur. Make a line graph of them. Which are the hottest and coldest months of the year?

Table:  Average Monthly Maximum Temperatures in Jodhpur, Rajasthan (°C)

Answer

The hottest months in the year are

  • April(38°C)
  • June(40°C)
  • May(42°C)

The coldest months in a year are

  • February(12°C)
  • December(11°C)
  • January(9°C)

7.) Give three possible explanations for the differences between the average temperatures in Thiruvananthapuram and Shimla in January (refer to your Atlas).

Answer

The explanations are:

  • Distance from the Equator- Places near the equator receive more heat like Thiruvananthapuram is comparatively closer to the equator and experiences warmer temperatures

compared to those away from the equator like Shimla which is farther away from the equator, it will experience cooler temperatures.

  • Altitude- The elevation of a place above the sea level influences its temperature and since Shimla is located in higher altitudes it will experience cooler temperatures whereas Thiruvananthapuram is located at a very less altitude it experiences comparatively warmer temperatures.
  • Distance from the Sea- If a place is closer to the sea, it will be effected by the moderating effect of the sea and will have a less average temperature like in Thiruvananthapuram whereas the other hand, places away from sea experience extreme temperatures such as in Shimla.

8.) Between Bhopal, Delhi, Mumbai and Shimla, which two places show a similar temperature pattern? Explain the similarity between these two places

Answer

The two places which show a similar temperature pattern are

  • Delhi
  • Bhopal

It’s because both places are slightly in the same height to the sea level and also are far from the sea shore.The subtropical climate accompanied by humidity tends to show a similar temperature pattern. The highest temperature in this places reach upto (exceeding 40°C) and the lowest temperature (16° C).Both places are far away from the equator.

9.) Look at the graph of Minimum- Maximum temperature on the  right and answer the questions below:

a) What is the average highest temperature in July?

Answer

Approximately 23°C

b) How warm does it usually get in December?

Answer

Approximately 19°C

c) How cool does it usually get in June?

Answer

Approximately 15°C

d) Is there a bigger difference between night and day temperature in May or in August?

Answer

Yes there is a difference between night and day temperature in May as temperature reaches upto 28 °C and falls down to 16°C.

e) When is summer?

Answer

Summer is in the month of March, April, May.

10.) How is solar energy better than thermal power?

Answer

Solar energy is a renewable energy source as it can be used to generate electricity as long as the Sun is present, whereas thermal power is a non-renewable energy source needed to generate electricity. Solar energy doesn’t create any pollution in the environment whereas thermal energy create huge amount pollution in the environment.

11.) Read the para under the title “Height and Temperature” of page 27 and comment on it?

Answer

In summer some people go from the plains to hilly places to avoid the extreme as the temperatures are low on high hills. The highest parts of a mountain generally have the lowest temperatures. Temperatures decreases by 3.5°F for every 1000 ft of altitude (6.5°C for every 1000 metres).

Updated: September 18, 2021 — 4:27 pm

Leave a Reply

Your email address will not be published. Required fields are marked *