Atmospheric Circulation and Weather Systems Ch (9) Practice Quiz in English Part 1 || Class 11 Geography Book -1 Practice Quizzes in English Posted on February 25, 2025February 27, 2025 by Anshul Gupta0% 0 votes, 0 avg 1 Atmospheric Circulation and Weather Systems Ch (9)Practice Quiz in English Part 1 || Class 11 Geography Book -1 Practice Quizzes in English 1 / 201. What is the approximate pressure at an altitude of 5 km according to the standard atmosphere? A. 540.48 mb B. 265 mb C. 1013.25 mb D. 898.76 mb Explanation: The table provided in the text indicates that the standard pressure at 5 km altitude is 540.48 mb. 2 / 202. Why don’t we experience strong upward winds despite the significant vertical pressure gradient force? A. Coriolis force counteracts it B. Gravitational force balances it C. Frictional force negates it D. Wind direction is primarily horizontal Explanation: The vertical pressure gradient force is generally balanced by an almost equal but opposite gravitational force, preventing strong upward winds. 3 / 203. What are lines connecting places having equal pressure called? A. Isobars B. Isotherms C. Isohyets D. Contours Explanation: Isobars are lines on a weather map connecting points of equal atmospheric pressure. 4 / 204. Where are the high-pressure areas known as subtropical highs found? A. Along 60° N and 60° S B. Near the poles C. Near the equator D. Along 30° N and 30° S Explanation: Subtropical highs are high-pressure belts located around 30 degrees north and south of the equator. 5 / 205. What causes the movement of air from high pressure to low pressure? A. Gravity B. Temperature differences C. Humidity D. Earth's rotation Explanation: Air expands when heated and becomes less dense, leading to lower pressure. It moves towards areas of cooler, denser air with higher pressure. 6 / 206. What is the decrease in atmospheric pressure per 10m increase in elevation in the lower atmosphere? A. 10 mb B. 100 mb C. 1 mb D. 0.1 mb Explanation: In the lower atmosphere, pressure decreases at a rate of approximately 1 millibar for every 10-meter increase in elevation. 7 / 207. What is a low-pressure system characterized by? A. Lowest pressure in the center B. Pressure increasing outward C. Highest pressure in the center D. No pressure variation Explanation: A low-pressure system has the lowest pressure at its center, with pressure increasing outwards. 8 / 208. Where is the Coriolis force maximum? A. 60° N and 60° S B. 30° N and 30° S C. Equator D. Poles Explanation: The Coriolis effect is strongest at the poles and gradually decreases to zero at the equator. 9 / 209. What are the low-pressure belts located along 60° N and 60° S called? A. Subpolar low B. Polar high C. Equatorial low D. Subtropical high Explanation: The low-pressure belts found around 60 degrees north and south are called subpolar lows. 10 / 2010. Why are tropical cyclones not formed near the equator? A. Coriolis force is absent B. Pressure gradient force is too weak C. Wind shear is too strong D. Sea surface temperature is too low Explanation: The Coriolis force, necessary for the spinning motion of cyclones, is zero at the equator. 11 / 2011. What is the area near the equator with low sea level pressure known as? A. Subtropical high B. Polar high C. Subpolar low D. Equatorial low Explanation: The region near the equator experiences low pressure due to high insolation and is called the equatorial low. 12 / 2012. What is the average atmospheric pressure at sea level? A. 1020 mb B. 1013.2 mb C. 1000 mb D. 1050 mb Explanation: The average atmospheric pressure at sea level is 1013.2 millibars. 13 / 2013. What is the wind circulation around a low-pressure system called? A. Anticyclonic B. Geostrophic C. Trade winds D. Cyclonic Explanation: Wind circulation around a low-pressure area is called cyclonic circulation. 14 / 2014. Why is atmospheric pressure measured at any station reduced to sea level for comparison? A. To eliminate the effect of altitude B. To standardize measurements C. To simplify calculations D. To account for temperature differences Explanation: Pressure decreases with altitude, so reducing measurements to sea level allows for accurate comparison between different locations. 15 / 2015. What is the name for the horizontal movement of air? A. Advection B. Pressure gradient C. Convection D. Wind Explanation: Wind is the term used to describe the horizontal movement of air. 16 / 2016. What force affects the direction of wind due to Earth’s rotation? A. Coriolis force B. Frictional force C. Pressure gradient force D. Gravitational force Explanation: The Coriolis force is a result of Earth’s rotation and deflects winds to the right in the Northern Hemisphere and left in the Southern Hemisphere. 17 / 2017. What is the direction of wind around a high-pressure system in the Northern Hemisphere? A. Clockwise B. Anticlockwise C. Parallel to isobars D. Perpendicular to isobars Explanation: In the Northern Hemisphere, winds blow clockwise around a high-pressure system. 18 / 2018. What is the primary cause of air motion? A. Variation in atmospheric pressure B. Variation in temperature C. Variation in humidity D. Variation in wind speed Explanation: Differences in atmospheric pressure create pressure gradients, which are the primary cause of air motion. 19 / 2019. In which direction does the Coriolis force deflect wind in the Southern Hemisphere? A. Downward B. Upward C. Right D. Left Explanation: The Coriolis force deflects winds to the left in the Southern Hemisphere and to the right in the Northern Hemisphere. 20 / 2020. Are the pressure belts on Earth permanent? A. Yes, they remain fixed B. No, they oscillate with the sun's movement C. They change only with seasons D. They vary unpredictably Explanation: Pressure belts shift with the apparent movement of the sun, moving southward in the northern hemisphere’s winter and northward in summer. Please insert your information to see your ranking अपनी Ranking जानने के लिए कृपया अपनी जानकारी भरे NamePhone Number Your score isThe average score is 65% 0% Restart quiz Category: Class 11 Geography Quizzes in English
