Samacheer Kalvi 8th Social Science Geography Unit 2 Book Back Answers:

Samacheer Kalvi 8th Standard New Social Science Book Back 1 Mark and 2 Mark Question & Answers PDF uploaded and available below. Class 8 New Syllabus 2023 to 2024 Book Back Question & Answer available for both English and Tamil Mediums. Class 8 Social Geography Book Unit 2 – Weather and Climate Answers Solutions are provided on this page. The 8th Std Social Science History Book portion consists of 8 units, the Geography Book portion consists of  8 units, the Civics book portion consists of 7 units and the Economics book portion consists of 2 units, All Social Book Back One, and Two Mark Solutions are given below.

Check Unit wise and  Samacheer Kalvi 8th Social Science Book Back Solutions Answers PDF format for Free Download. English, Tamil, Maths, Science, and Social Science Book Back Question and Answer are available in PDF. Class 8th Standard Social Book Back Answers PDF. Check Social Science – History, Geography, Civics, and Economics Answers below. See below for the 8th New Syllabus Book Back guide/Answers free PDF download:

Samacheer Kalvi 8th Social Science Book Back Solutions PDF:

8th Social Subject 1 Mark and 2 Mark Solutions PDFs are available below. Click the Download option to download the book back 1 Mark & 2 Mark questions and answers. Take the printout and use it for exam purposes. Samacheer Kalvi 8th Geography Unit 2 Answers are given below.

Geography Book Back Answers

Unit 2 – Weather and Climate

I. Choose the correct answer:

1. Earth’s atmosphere contains about …………… percentage of nitrogen and oxygen.
(a) 78% and 21%
(b) 22% and 1%
(c) 21% and 0.97%
(d) 10% and 20%
Answer: (a) 78% and 21%

2. …………… is generally defined as the average conditions of the weather of a place or a region.
(a) Earth
(b) Atmosphere
(c) Climate
(d) sun
Answer: (c) climate

3. The earth receives energy from …………….
(a) Current
(b) Electro magnetic radiation
(c) Waves
(d) Heat
Answer: (b) Electro magnetic radiation

4. Which one the following represents places with equal amount of rainfall
(a) Isotherm
(b) Isohel
(c) Isobar
(d) Isohyets
Answer: (d) Isohyets

5. ………….. is used to measure the humidity.
(a) Anemometer
(b) Barometer
(c) Hygrometer
(d) Thermometer
Answer: (c) hygrometer

II. Fill in the Blanks

1. ……………… refers to the condition of atmosphere for a short period of time.
2. The scientific study of weather is called ………………
3. The highest temperature ever recorded on the earth is …………….
4. ……………. is a ratio between the actual amount of water vapour and the maximum amount of water vapour the air can hold.
5. …………….. and ……………. are measured by anemometer and wind vane respectively.
6. ………………. are imaginary lines which connect the same temperatures of different places.

Answer:

1. Weather
2. Meterology
3. 56.7°C
4. Relative humidity
5. Wind speed, Wind direction
6. Isotherms

III. Match the following

1. Climate             i.) Locating and Tracking Storms
2. Isonif                ii.) Cyclone
3. Hygrometer    iii.)Equal Snowfall
4. Radar               iv.) Long Term Changes
5. Low Pressure  v.) Humidity

Answer:

1. iv
2. iii
3. v
4. i
5. ii

IV. State whether the following statements are True or False

1. The atmosphere is a layer of gases surrounding the planet.
Answer: True

2. The Scientific study of weather is called Climatology.
Answer: False
Correct statement:
The Scientific study of weather is called meterology.

3. Isohel refers equal sunshine.
Answer: True

4. Humidity is calculated by Aneroid Barometer.
Answer: False
Correct statement:
Air pressure is calculated by an Aneroid Barometer.

V. Answer in brief

1. Define‘weather’.
Answer:
Weather is the day-to-day condition of the atmosphere at any place as regards sunshine, air pressure, humidity precipitation, and other elements.

2. What is insolation?
Answer:
Insolation is the solar radiation that reaches the earth’s surface. The earth and its atmosphere get heated from the sun through insolation.

3. What is meant by atmospheric pressure?
Answer:
The weight of air above a given area on the earth’s surface is called atmospheric pressure or air pressure.

4. Write a short note on “Planetary winds”
Answer:

1. Planetary Winds are the ones which blow almost in the same direction throughout the year. So, they are called Permanent or planetary winds.
2. Trade winds, Westerlies, and polar easterlies are the types of prevailing winds.

5. What are “Isolines”?
Answer:

• The distribution of weather elements is shown by means of Isolines on maps.
• Isolines are those which join the place of equal values.

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