NIOS Class 12 Geography Chapter 7 Atmospheric Pressure and Winds

NIOS Class 12 Geography Chapter 7 Atmospheric Pressure and Winds Solutions English Medium As Per New Syllabus to each chapter is provided in the list so that you can easily browse throughout different chapters NIOS Class 12 Geography Chapter 7 Atmospheric Pressure and Winds Notes and select need one. NIOS Class 12 Geography Chapter 7 Atmospheric Pressure and Winds Question Answers Download PDF. NIOS Study Material of Class 12 Geography Paper Code 316.

NIOS Class 12 Geography Chapter 7 Atmospheric Pressure and Winds

Also, you can read the NIOS book online in these sections Solutions by Expert Teachers as per National Institute of Open Schooling (NIOS) Book guidelines. These solutions are part of NIOS All Subject Solutions. Here we have given NIOS Class 12 Geography Solutions, NIOS Senior Secondary Course Geography Solutions for All Chapter, You can practice these here.

Atmospheric Pressure and Winds

Chapter: 7

MODULE – 4: Dynamics of Atmosphere

INTEXT QUESTIONS 7.1

Give an appropriate term for the following:

1. A force per unit area exerted by the atmosphere above earth’s surface.

Ans: Atmospheric pressure.

2. Name the term by which air pressure is shown on the map?

Ans: Isobar.

3. An instrument which is used for measuring air pressure.

Ans: Barometer.

4. Name the term showing the difference between two isobars. 

Ans: Pressure gradient.

INTEX QUESTION 7.2 

Write ‘True’ for correct and ‘False’ for incorrect statements: 

1. There is an inversely proportional relationship between temperature and pressure. 

Ans: True.

2. The maximum atmospheric pressure is at the mountain top. 

Ans: False.

3. Earth’s rotation on its axis affects the pressure especially in mid latitude.

Ans: True.

4. Continental airs are lighter in weight then oceanic air.

Ans : False.

INTEX QUESTION 7.3 

1. What is the other name of inter tropical convergence zone?

Ans: Doldrums.

2. Name the pressure belt which is related to horse latitude. 

Ans: Subtropical high pressure belt.

3. Which factor is responsible for the sub – polar low pressure belt?

Ans: Dynamic factor.

4. Name the continents where the low pressure exists in the month of January.

Ans: Australia, Africa and South America.

INTEX QUESTION 7.4 

1. Name the forces of wind motions.

Ans: Pressure gradient force and Coriolis force .

2. Give an example of planetary winds. 

Ans: Trade winds, Westerlies and Polar easterlies.

3. Loo, Chinook and Sirocco are examples of which type of wind?

Ans: Hot winds.

4. What are the main characteristics of monsoon winds? 

Ans: Seasonal reversal of winds is the main characteristic of monsoon winds.

TERMINAL QUESTIONS 

1. Choose the correct answer for each of the following: 

(a) Sirocco is the type of wind.

(i) Hot local wind.

(ii) Cold local wind.

(iii) Seasonal wind.

(iv) Planetary wind.

Ans: (i) Hot local wind.

(b) Where is the maximum deflective force? 

(i) Equator.

(ii) Tropics.

(iii) Poles. 

(iv) Mid latitudes.

Ans: (iii) Poles.

(c) Which one is an example of periodic wind:

(i) Land and sea bridges.

(ii) Westerlies. 

(iii) Monsoon. 

(iv) Fohn.

Ans: (iii) Monsoon.

2. Name the factors on which the atmospheric pressure of any place depends.

Ans: Altitude – Atmospheric pressure decreases with increasing height. It means pressure at ground level is higher than air pressure at the top of high mountains. Because atmospheric pressure is the weight of all the air above the level at which it is measured. 

Temperature- The atmospheric pressure is closely linked with atmospheric temperature. It means the spatial variation in the atmospheric pressure is directly controlled by the temperature. There is an increased relationship between temperature and pressure because when air is heated due to high temperature, its molecules and particles extend over a large area. Its air pressure decreases. Therefore we can say atmospheric pressure decreases when temperature increases.

Earth’s rotation- Earth rotation also makes a great impact on the pressure belt of the globe. Due to the Earth rotation on its axis, equatorial air moves far away from the centre while polar air attracts towards the centre. As a result, the air column of mid latitude changes more.

Water vapour- The existence of water vapour also affects the atmospheric pressure. The greater the concentrations of water vapour in the air, the density of air is less. Air with lower water vapour makes it heavy or high in density.