Atmospheric Dynamics, Monsoons and Cyclones - Atmospheric Science - Engineering Sciences Previous Year Questions

1

2017 · Engineering Sciences · Atmospheric Science · Atmospheric Dynamics, Monsoons and Cyclones

Engineering Sciences (XE) 2017

Rossby Number is the ratio of

A

Coriolis Force to Inertial Force

B

Inertial Force to Coriolis Force

C

Gravitational Force to Coriolis Force

D

Viscous Force to Inertial Force

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2

2017 · Engineering Sciences · Atmospheric Science · Atmospheric Dynamics, Monsoons and Cyclones

Engineering Sciences (XE) 2017

A thin iceberg is observed to move southeastward in the Arctic Ocean. If the surface current is wind driven, the prevailing wind is

A

Easterly

B

Northerly

C

Southerly

D

Westerly

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3

2017 · Engineering Sciences · Atmospheric Science · Atmospheric Dynamics, Monsoons and Cyclones

Engineering Sciences (XE) 2017

Equatorial Kelvin and Rossby waves respectively propagate

A

Westward and Eastward

B

Eastward and Westward

C

Westward and Westward

D

Eastward and Eastward

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4

2017 · Engineering Sciences · Atmospheric Science · Atmospheric Dynamics, Monsoons and Cyclones

Engineering Sciences (XE) 2017

At 17°N, a mass of fluid is moving under geostrophic balance at 0.3 m s^-1 towards east. Suddenly the pressure gradient force becomes zero. Then the fluid will
[Angular velocity of the Earth: 7.27 × 10^-5 rad s^-1]

A

continue to move towards the east at 0.3 m s^-1

B

undergo circular motion with radius of about 17 km

C

undergo circular motion with radius of about 7 km

D

move southward

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5

2017 · Engineering Sciences · Atmospheric Science · Atmospheric Dynamics, Monsoons and Cyclones

Engineering Sciences (XE) 2017

At 45°N, wind is blowing northward and its magnitude decreases eastward from 10 m s^-1 to 1 m s^-1 over a distance of 18 km. The absolute vorticity of the flow is __________ × 10^-4 s^-1.
[Angular velocity of the Earth: 7.27 × 10^-5 rad s^-1]

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6

2017 · Engineering Sciences · Atmospheric Science · Atmospheric Dynamics, Monsoons and Cyclones

Engineering Sciences (XE) 2017

In a severe tropical cyclone, 250 mm of rainfall occurs in an area having a radius of 200 km. If the energy supplied to the system from this rainfall is N times the energy of one atomic bomb (=1.5× 10¹⁵ kJ), then the value of N is __________.
[Density of freshwater: 1000 kg m^-3, Specific heat of seawater: 4200 J kg^-1 K^-1, Latent heat of evaporation: 2.45 × 10⁶ J kg^-1]

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7

2017 · Engineering Sciences · Atmospheric Science · Atmospheric Dynamics, Monsoons and Cyclones

Engineering Sciences (XE) 2017

A cumulonimbus cloud forms by an air parcel rising from the sea level with an initial temperature of \( 27^{\circ} C \) and specific humidity of \( 20\ \text{g kg}^{-1} \), respectively. Assume that moist static energy is conserved in this cloud. Then the cloud temperature at an altitude of 15 km is ________ K.
[Specific heat of dry air at constant pressure: \( 1005\ \text{J kg}^{-1}\ \text{K}^{-1} \), Specific heat of water vapour at constant pressure: \( 1850\ \text{J kg}^{-1}\ \text{K}^{-1} \), \( g = 10\ \text{m s}^{-2} \), Latent heat of evaporation: \( 2.45 \times 10^6\ \text{J kg}^{-1} \)]

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8

2017 · Engineering Sciences · Atmospheric Science · Atmospheric Dynamics, Monsoons and Cyclones

Engineering Sciences (XE) 2017

If \( u_g \) and \( v_g \) are respectively zonal and meridional components of a flow field in geostrophic balance, then the divergence of this flow is [\( x, y, f, p, \rho \) are zonal distance, meridional distance, Coriolis parameter, pressure and density, respectively]

A

\(0 \)

B

\(\frac{u_g}{f} \frac{\partial f}{\partial x} \)

C

\(-\frac{1}{\rho f} \frac{\partial^2 p}{\partial y^2} \)

D

\(-\frac{v_g}{f} \frac{\partial f}{\partial y} \)

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9

2017 · Engineering Sciences · Atmospheric Science · Atmospheric Dynamics, Monsoons and Cyclones

Engineering Sciences (XE) 2017

During the Indian summer monsoon season, depressions do not intensify to tropical cyclones because
P: Indian sub-continent is very hot and large land-sea temperature difference pulls depressions quickly to land before they can intensify into cyclones.
Q: southwesterly winds at low level are not conducive for the formation of tropical cyclones.
R: SST cooling due to strong monsoonal winds prevents cyclone formation.
S: strong zonal wind shear during the monsoon season does not allow warm core formation.
Which of the above statement(s) is(are) correct

A

P & Q

B

Only R

C

Only S

D

R & S

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10

2017 · Engineering Sciences · Atmospheric Science · Atmospheric Dynamics, Monsoons and Cyclones

Engineering Sciences (XE) 2017

Which among the following statement(s) is (are) correct.
P: ENSO and El-Nino are the same and refer to the warming of Equatorial Eastern Pacific SST.
Q: ENSO is an atmosphere-ocean coupled phenomenon and El-Nino is its oceanic part.
R: ENSO is an atmospheric phenomenon and El-Nino is an oceanic phenomenon
S: ENSO is the oscillatory component of El-Nino having a period of 4.7 years.

A

P & R

B

Only Q

C

P, Q and S

D

R & S

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11

2018 · Engineering Sciences · Atmospheric Science · Atmospheric Dynamics, Monsoons and Cyclones

Engineering Sciences (XE) 2018

Correct order of the maximum vertical extent of atmospheric circulation cells is

A

Hadley > Ferrel > Polar

B

Polar > Hadley > Ferrel

C

Hadley > Polar > Ferrel

D

Ferrel > Hadley > Polar

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12

2018 · Engineering Sciences · Atmospheric Science · Atmospheric Dynamics, Monsoons and Cyclones

Engineering Sciences (XE) 2018

Analysis of an atmospheric variable shows prominent modes at 5, 40 and 1460 days. These modes correspond respectively to

A

Tidal, MJO and ENSO

B

Synoptic, MJO and ENSO

C

Synoptic, MJO and Decadal

D

Tidal, Milankovich and ENSO

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13

2018 · Engineering Sciences · Atmospheric Science · Atmospheric Dynamics, Monsoons and Cyclones

Engineering Sciences (XE) 2018

In a numerical weather prediction model with a horizontal grid resolution of 50 km, convective cloud processes are parameterized, because

A

Cloud physics is not known for modelling

B

Models cannot handle phase change

C

Cloud size is larger than the grid size

D

Cloud size is much smaller than the grid size

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14

2018 · Engineering Sciences · Atmospheric Science · Atmospheric Dynamics, Monsoons and Cyclones

Engineering Sciences (XE) 2018

P and Q respectively describe flow fields corresponding to

A

Mid latitude Rossby and Polar gravity waves

B

Equatorial Rossby and Equatorial Kelvin waves

C

Midlatitude gravity and Polar Rossby waves

D

Equatorial Kelvin and Equatorial Rossby waves

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15

2018 · Engineering Sciences · Atmospheric Science · Atmospheric Dynamics, Monsoons and Cyclones

Engineering Sciences (XE) 2018

At 30°N and 700 hPa pressure level, wind field is in gradient balance. If the gradient wind speed is 50 m s^-1 and radius of curvature of the flow is 50 km, the corresponding geostrophic wind speed is __________ m s^-1. (Give the answer to one decimal place.) Take the angular velocity of the Earth as 7.3x10^-5 s^-1

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16

2018 · Engineering Sciences · Atmospheric Science · Atmospheric Dynamics, Monsoons and Cyclones

Engineering Sciences (XE) 2018

In a tropical cyclone over the Pacific Ocean, surface pressure at 500 km from the cyclone centre is 1000 hPa. Surface pressure at the centre is 900 hPa. Sea surface temperature and surface air temperature remain constant at 28°C and 27°C, respectively. Difference in potential temperature between 500 km and cyclone centre is _________ K. (Give the answer to two decimal places.) Take g = 9.8 m s^-2, C_p = 1005 J kg^-1 K^-1, gas constant R = 287 J kg^-1 K^-1.

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17

2018 · Engineering Sciences · Atmospheric Science · Atmospheric Dynamics, Monsoons and Cyclones

Engineering Sciences (XE) 2018

A cloud forms by the lifting of moist air from the surface with the initial conditions T_s = 30°C, RH = 80% and P_s = 1005 hPa. If the vapour pressure of this parcel at 500 hPa is 6.5 hPa, the liquid water content of the parcel if no precipitation takes place is _________ gm kg^-1. (Give the answer to one decimal place.) Saturation vapour pressure of water at 30°C is 42.43 hPa.

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18

2018 · Engineering Sciences · Atmospheric Science · Atmospheric Dynamics, Monsoons and Cyclones

Engineering Sciences (XE) 2018

If wind speed over ocean surface is 10 m s^-1, air-sea interface momentum flux is _________ N m^-2. (Give the answer to two decimal places.) Surface air temperature and pressure are 27°C and 1000 hPa, respectively. Take drag coefficient as 0.001 and gas constant R = 287 J kg^-1 K^-1.

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19

2019 · Engineering Sciences · Atmospheric Science · Atmospheric Dynamics, Monsoons and Cyclones

Engineering Sciences (XE) 2019

In the equatorial belt, the Madden-Julian Oscillation (MJO) propagates

A

northward

B

southward

C

eastward

D

westward

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20

2019 · Engineering Sciences · Atmospheric Science · Atmospheric Dynamics, Monsoons and Cyclones

Engineering Sciences (XE) 2019

Potential temperature increases with height in an atmosphere. Upon adiabatic vertical displacement, a parcel of dry air is

A

stable

B

absolutely unstable

C

neutral

D

conditionally unstable

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