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Atmospheric Pressure and Weather System

Atmospheric pressure and weather systems, Geography, XI

25 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

For preparation of weather maps, which of the following reasons is correct, for measuring air pressure at station level after reducing it to sea level?

  1. Because of the effect of wind in denser gravity
  2. For adjusting variations caused by air motions
  3. Because of the vertical pressure exerted by gradient forces
  4. For eliminating the effect of altitude
  5. For eliminating the effect of turbulent wind patterns and air masses
Question 2 Multiple Choice (Single Answer)

Which of the following statements is/are true?
a. Due to gravity the air at the surface is denser and hence, has higher pressure.
b. Air pressure is measured with the help of the aneroid barometer.
c. Air pressure increases with height.

  1. Only a
  2. Only b
  3. Only c
  4. Only a and b
  5. All of these
Question 3 Multiple Choice (Single Answer)

Which of the following is generally balanced by a nearly equal but opposite gravitational force, so that strong upward winds are not experienced?

  1. The vertical pressure gradient force
  2. The horizontal pressure gradient
  3. The gravity in the surface air
  4. All of the above
  5. None of the above
Question 4 Multiple Choice (Single Answer)

Which of the following statements about wind is/are correct?
a. Air is set in motion due to differences in atmospheric pressure.
b. The wind blows from high pressure to low pressure.
c. The wind at the surface experiences friction.

  1. Only a
  2. Only b
  3. Only c
  4. Only a and b
  5. All of these
Question 5 Multiple Choice (Single Answer)

Which of the following is true about frictional force?

  1. It affects the speed of wind.
  2. It is caused by the rotation of earth.
  3. It acts perpendicular to the pressure gradient force.
  4. It is maximum over the sea surface.
  5. It affects the gravity.
Question 6 Multiple Choice (Single Answer)

The force exerted by the rotation of the earth is known as the

  1. pressure gradient force
  2. frictional force
  3. gravitational force
  4. coriolis force
  5. equatorial lows
Question 7 Multiple Choice (Single Answer)

Which of the following is incorrect about the coriolis force?

  1. It deflects the wind to the right direction in the northern hemisphere.
  2. The deflection is more when the wind velocity is high.
  3. It is maximum at the poles and is absent at the equator.
  4. It acts perpendicular to the pressure gradient force.
  5. It is the rate of change of pressure with respect to distance.
Question 8 Multiple Choice (Single Answer)

The wind circulation around a low is called

  1. the polar high
  2. the equatorial low
  3. the subtropical high
  4. cyclonic circulation
  5. the general circulation of the atmosphere
Question 9 Multiple Choice (Single Answer)

On which of the following the pattern of planetary winds does not depend?

  1. The latitudinal variation of atmospheric heating.
  2. The emergence of pressure belts.
  3. The migration of belts following apparent path of the sun.
  4. The distribution of continents and oceans.
  5. The gravitational pull.
Question 10 Multiple Choice (Single Answer)

Which of the following causes the air at the Inter Tropical Convergence Zone (ITCZ) to rise?

  1. It rises because of convection caused by high insolation and a low pressure is created.
  2. It rises because of polar highs and the oscillation of the high created.
  3. It rises because of low pressure due to gradient forces.
  4. It rises because of the general circulation of air.
  5. It rises because of anti cyclonic circulation and high pressure created.
Question 11 Multiple Choice (Single Answer)

Which of the following is correct about westerlies?

  1. The cells from which westerlies arrive are called Ferrel cells.
  2. Hadley cells are the source for westerlies.
  3. Polar cells blowing towards the middle latitudes cause the westerlies.
  4. The transfer of heat energy from lower latitudes to higher latitudes causes the westerlies.
  5. None of the above
Question 12 Multiple Choice (Single Answer)

Which of the following is not a type of air mass?

  1. Maritime tropical (mT)
  2. Continental tropical (cT)
  3. Maritime polar (mP)
  4. Continental polar (cP)
  5. Maritime arctic (mA)
Question 13 Multiple Choice (Single Answer)

Which of the following is/are correct about El Niño?
a. The appearance of the warm water of Central Pacific ocean off the coast of Peru.
b. The change in pressure condition over Pacific, is known as southern oscillation.
c. It is used for long range weather forecasting in major parts of the world.

  1. Only a
  2. Only b
  3. Only c
  4. Only a and b
  5. Only b and c
Question 14 Multiple Choice (Single Answer)

Extra tropical cyclones form along the ____________ front.

  1. polar
  2. warm
  3. stationary
  4. occluded
  5. middle latitude
Question 15 Multiple Choice (Single Answer)

Which of the following is correct about cumulus clouds?

  1. The cold front moves faster than the warm front ultimately overtaking the warm front, which is completely lifted up and the front is occluded and the cumulus clouds are formed.
  2. If an air mass is fully lifted above the land surface, it causes cumulus clouds.
  3. The cold front approaches the warm air from behind and pushes the warm air up resulting in the development of cumulus clouds along the cold front.
  4. All of the above.
  5. None of the above.
Question 16 Multiple Choice (Single Answer)

Which of the following is correct about isobars?
a. Horizontal distribution of pressure is studied by drawing isobars at constant levels.
b. Isobars are lines connecting places having equal pressure.
c. The more closely spaced the isobars are, the lesser the pressure gradient.

  1. Only a
  2. Only b
  3. Only c
  4. All of these
  5. Only options a and b
Question 17 Multiple Choice (Single Answer)

Which of the following conditions should be fulfilled for geostrophic wind?
a. Isobars are straight and without friction.
b. The coriolis force balances the frictional force.
c. The pressure gradient force is balanced by the Coriolis force.
d. The wind blows parallel to the isobar.

  1. Only a, b and c
  2. Only a, b and d
  3. Only a, c and d
  4. Only b, c and d
  5. All of these
Question 18 Multiple Choice (Single Answer)

What are caused by intense convection on moist hot days.

  1. Thunderstorms
  2. Tornadoes
  3. Water sprouts
  4. Tropical cyclones
  5. Frontogenesis
Question 19 Multiple Choice (Single Answer)

Which of the following conditions is not favourable for the formation and intensification of tropical storms?

  1. Large sea surface with temperature higher than 27° C.
  2. Presence of the Frictional force.
  3. Small variations in the vertical wind speed.
  4. A pre-existing weak low pressure area.
  5. Upper divergence above the sea level system.
Question 20 Multiple Choice (Single Answer)

Which of the following statements is/are correct?
a. During the night in the mountainous regions the slopes get cooled and the dense air descends into the valley as the katabatic wind.
b. The cool air of the high plateaus and ice fields draining into the valley is called the adiabatic wind.
c. During the day the slopes get heated up and air moves upslope to fill the resulting gap, this is called the valley breeze.

  1. Only a
  2. Only b
  3. Only c
  4. Only a and b
  5. All of these
Question 21 Multiple Choice (Single Answer)

Which of the following is/are the source(s) of formation of air masses?

  1. Siberian plain
  2. Equatorial forest
  3. Sahara desert
  4. Only 1 and 3
  5. None of the above
Question 22 Multiple Choice (Single Answer)

Which of the following is/are not true about the tropical cyclones?
a. The air pressure near the storm causes it to intensify.
b. The storm strengthens over the sea.
c. The storm dissipates after the landfall.

  1. Only a
  2. Only b
  3. c only
  4. Only a and c
  5. Only b and c
Question 23 Multiple Choice (Single Answer)

Which of the following statements is/are correct?
a. A mature tropical cyclone is characterised by the strong spirally circulating wind around the centre, called the eye.
b. The cyclones, which cross 20oN latitude generally, recurve and peter out.
c. From the eye wall rain bands may radiate and trains of cumulus and cumulonimbus clouds may drift into the outer region.

  1. Only a
  2. Only b
  3. Only c
  4. Only a and b
  5. Only a and c
Question 24 Multiple Choice (Single Answer)

Which of the following statements is/are incorrect?
a. The fronts occur in middle latitudes and are characterised by steep gradient in temperature and pressure.
b. The fronts bring abrupt changes in temperature and cause the air to rise to form clouds and cause thunderstorms.
c. When two different air masses meet, the boundary zone between them is called a front.

  1. Only a
  2. Only b
  3. Only c
  4. All of these
  5. None of these
Question 25 Multiple Choice (Single Answer)

Which of the following statements is/are incorrect?
a. The warm air, of the high plateaus and ice fields draining into the valley is called katabatic wind.
b. Katabatic winds melt the snow in a short time.
c. Adiabtic process helps the warm winds to melt the snow.

  1. Only a
  2. Only b
  3. Only c
  4. Only a and b
  5. Only a and c
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