GATE XE year:2020 PYQs & Answers — Page 17

Questions 161–170 of 175. Imported answers require independent review unless marked reviewed.

The emissivity of polluted air that reflects and transmits 20% and 60% of the incoming solar radiation, respectively, at a given wavelength (correct up to 1 decimal place) is ______.

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Given that the angular velocity of rotation of the Earth = 7.3 × 10⁻⁵ s⁻¹, the period of inertial oscillations generated in the ocean by surface winds at 30° N latitude (rounded off to the nearest integer) is ______ hours.

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Consider a high pressure centre in the northern hemisphere with tangential winds of 10 m s⁻¹ at a distance of 500 km from the centre. Assuming solid body rotation principles, what is the relative vorticity of the flow?

Your answerChoose one option.

2 × 10⁻⁵ s⁻¹

−2 × 10⁻⁵ s⁻¹

4 × 10⁻⁵ s⁻¹

−4 × 10⁻⁵ s⁻¹

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Which one of the following statements is true for atmospheric and oceanic general circulation models?

Your answerChoose one option.

Vertical velocity is ignored in oceanic models but not in atmospheric models.

Boussinesq approximation is adequate in oceanic models but not in atmospheric models.

Atmospheric models need a longer spin-up and integration time than oceanic models.

Atmospheric models need parameterizations for subgrid scale processes but ocean models do not.

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Consider a scenario where air temperature increases by 2 °C. We know that saturation vapour pressure for water increases with temperature. As a result of this effect, the water vapour content of the atmosphere will ______ and the net warming will be ______ than 2 °C. The correct pair of words to fill in the blanks (in the right order) is

Your answerChoose one option.

increase, more

increase, less

decrease, more

decrease, less

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The prevailing Trade winds over the Equator in the Pacific Ocean result in piling up of waters in the ______ part of the ocean. As a result, the gradients of the thermocline and the ocean surface have ______ signs. The correct pair of words to fill in the blanks (in the right order) is

Your answerChoose one option.

western, opposite

western, same

eastern, opposite

eastern, same

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Consider two different cases, shown in Figures (i) and (ii) below, with two layers of water of same density on top of each other.

Figure	Upper layer	Lower layer
(i)	Warm and salty	Cold and fresh
(ii)	Cold and fresh	Warm and salty

Which one of the following statements is true about convective plumes across the interface of the two layers?

Your answerChoose one option.

Upward convective plumes in (i) and downward convective plumes in (ii)

Downward convective plumes in (i) and upward convective plumes in (ii)

No convective plume in (i) and (ii)

No convective plume in (i) but upward convective plumes in (ii)

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During the Indian summer monsoon, surface outgoing longwave radiation (OLR) over the Arabian Sea is often observed to be low because

Your answerChoose one option.

of enhanced convection

monsoon winds advect the OLR away into the Indian subcontinent

monsoon clouds limit incoming solar radiation

surface Bowen ratio is low

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A tsunami wave in the ocean is approaching the coast. Assuming g = 10 m s⁻², the correct group speed of the wave at a depth of 1 km is

Your answerChoose one option.

1 m s⁻¹

10 m s⁻¹

100 m s⁻¹

1000 m s⁻¹

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A tornado is in cyclostrophic balance where the horizontal pressure gradient and centrifugal forces balance each other. Consider a tornado with 100 m radius and a tangential velocity of 100 m s⁻¹ at the edge. Assuming air density = 1 kg m⁻³, the magnitude of the pressure-drop between the centre and the edge of the tornado is ______ kg m⁻¹ s⁻².

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GATE XE year:2020 PYQs

Question 8

Question 9

Question 10

Question 11

Question 12

Question 13

Question 14

Question 15

Question 16

Question 17