Class 9 Social Science MCQ Chapter 7 Atmosphere Structure, Air Pressure and Wind System, Class 9 Social Science MCQ Question Answer, Class 9 Social Science Multiple Choice Question Answer to each chapter is provided in the list of SCERT Social Science Class 9 Objective Types Question Answer so that you can easily browse through different chapters and select needs one. Class 9 Social Science MCQ Chapter 7 Atmosphere Structure, Air Pressure and Wind System can be of great value to excel in the examination.
SCERT Class 9 Social Science MCQ Chapter 7 Atmosphere Structure, Air Pressure and Wind System
SCERT Class 9 Social Science MCQ Chapter 7 Atmosphere Structure, Air Pressure and Wind System Notes covers all the exercise questions in SCERT Science Textbooks. The NCERT Class 9 Social Science MCQ Chapter 7 Atmosphere Structure, Air Pressure and Wind System provided here ensures a smooth and easy understanding of all the concepts. Understand the concepts behind every chapter and score well in the board exams.
Atmosphere Structure, Air Pressure and Wind System
Chapter – 7
GEOGRAPHY
Multiple Choice Questions & Answers
1. Where is the Ozone layer located?
(a) Troposphere.
(b) Stratosphere.
(c) Mesosphere.
(d) Thermosphere.
Ans: (b) Stratosphere.
2. What is the amount of oxygen in the atmosphere in terms of volume?
(a) 20.94%
(b) 29.01%
(c) 32.47%
(d) 78.08%
Ans: (a) 20.94%.
3. The most important reasons for air movement is____
(a) Humidity difference.
(b) Pressure difference.
(c) Gravitational force.
(d) Centrifugal force.
Ans: (b) Pressure difference.
4. The instrument used for determination of wind velocity is____
(a) wind vane.
(b) Anemometer.
(c) Beanfort scale.
(d) Hydrometer.
Ans: (b) Anemometer.
5. The unit of wind velocity is____
(a) Knot.
(b) Millibar.
(c) Percentage.
(d) Degree.
Ans: (a) Knot.
6. Monsoon wind belongs to which of the following class?
(a) Local winds.
(b) Primary circulation.
(c) Secondary circulation.
(d) Permanent wind.
Ans: (c) Secondary circulation.
7. The name of the cyclone formed in the coastal region of the Pacific Ocean in the east is____
(a) Cyclone.
(b) Hurricane.
(c) Willy-willy.
(d) Typhoon.
Ans: (d) Typhoon.
8. Which gas readily absorbs heat?
(a) Oxygen.
(b) Carbon di oxide.
(c) Nitrogen.
(d) Methen.
Ans: (b) Carbon di oxide.
9. What is the other name of thermosphere?
(a) Lithosphere.
(b) hydrosphere.
(c) ionosphere.
(d) troposphere.
Ans: (c) ionosphere.
10. Where do the northern lights occur?
(a) troposphere.
(b) lithosphere.
(c) ionosphere.
(d) thermosphere.
Ans: (d) thermosphere.
11. In which layer is the temperature well above 300°C?
(a) exosphere.
(b) troposphere.
(c) thermosphere.
(d) mesosphere.
Ans: (a) exosphere.
12. Which has the lowest temperature in the atmosphere?
(a) ionosphere.
(b) mesosphere.
(c) stratosphere.
(d) lithosphere.
Ans: (b) mesosphere.
13. Which is not a fixed component of the atmosphere?
(a) dust.
(b) particles.
(c) water vapour.
(d) pebbles.
Ans: (d) pebbles.
14. Which protects the earth from meteors?
(a) thermosphere.
(b) stratosphere.
(c) troposphere.
(d) hydrosphere.
Ans: (a) thermosphere.
15. The thermosphere consists of electrically charged particles called____
(a) milibar.
(b) ions.
(c) feho.
(d) smoke.
Ans: (b) ions.
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