Virtual Academy for the Semi Arid Tropics Course on Crop-Weather Relationships Module III: Weather...

Virtual Academy for the Semi Arid Tropics

Course on Crop-Weather Relationships

Module III: Weather Elements

There are 19 multiple choice questions in this exercise.

Answer by clicking on one of the red letters (A, B, C, Or D). You will get a feedback to your response.

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1. 80 mm rainfall received in 30 minutes indicate

A. long duration rainfall

B. low intensity of rainfall

C. high intensity of rainfall

D. large size rain drops




2. Soil erosion may result with

A. Rains received over large area.

B. 120 mm of rainfall in 1 hour.

C. Low intensity rains with small drop size.

D. 10 mm of rainfall in 45 minutes.




3. Which type of rainfall you welcome to sow crops?

A. High intensity rains

B. Low intensity rains

C. 25 mm of rainfall a day before sowing

D. 10 cm rainfall after a day of sowing




4. Monsoon rains in India are received during

A. March to April and October to December

B. June to September and October to December

C. March to April and June to September

D. I am not sure




5. How rainfall breaks during late August and early September affect groundnut crop?

A. Delays sowing

B. Flower production is reduced

C. Pod development is affected

D. Harvesting of pods is difficult




6. Monsoon rains result due to

A. Lower temperatures over land than sea

B. Higher temperatures over land than sea

C. Low temperatures over land and sea

D. High temperatures over land and sea




7. The Relative humidity in the coastal areas during summer will be

A. low (10%)

B. moderate (30%)

C. high (50%)

D. very high (>60%)




8. Relative humidity is measured using

A. hygrometer

B. barometer

C. anemometer

D. I am not sure




9. At what relative humidity you will feel comfortable

A. 20%

B. 50%

C. 70%

D. 90%




10. Sunshine is recorded for measuring

A. minimum temperature

B. maximum temperature

C. day length

D. I am not sure




11. Maximum temperature is measured using ------ thermometer.

A. alcohol

B. mercury

C. Wet and dry bulb

D. I am not sure




12. Day and night temperatures vary because

of A. presence of moon during nights

B. absence of sun during nights

C. Cooler winds during nights

D. I am not sure




13. Air-pressure is measured by

A. hygrometer

B. barometer

C. anemometer

D. I am not sure




14. Lesser the air in the atmosphere, the air-pressure

A. will be low

B. will be high

C. will increase

D. I am not sure




15. A low-pressure system indicates

A. cooler temperatures

B. clear skies

C. possible rain

D. I am not sure




16. Wind velocity is measured by

A. anemometer

B. barometer

C. hygrometer

D. I am not sure




17. Winds move from

A. high air pressure to low pressure

B. low air pressure to high pressure

C. sea to land

D. land to sea




18. The type of clouds in the

picture are A. Rain-giving clouds

B. Fair-Weather clouds

C. Change-of-weather clouds

D. I am not sure




19. The type of clouds in the

picture are A. Rain-giving clouds

B. Fair-Weather clouds

C. Change-of-weather clouds

D. I am not sure




Thank you for completing this exercise.

Now you may select Module IV from Course contents.




Your answer is not correct.

The correct answer is:

80 mm rainfall received in 30 minutes indicate high intensity of rainfall.

Continue




You are right.

80 mm rainfall received in 30 minutes indicate high intensity of rainfall.

Continue




Your are right.

Soil erosion may result with a high intensity rainfall like 120 mm of rainfall in 1 hour.

Continue




Your answer is not correct.


Soil erosion may result with a high intensity rainfall like 120 mm of rainfall in 1 hour.

Continue




You are right.

Soaking rain like 25 mm of rainfall a day before will be useful to take up the sowings.

Continue




No please.


Water from high intensity rainfall mostly result in run off with very little water saturating the soil profile.

So soaking rain like 25 mm of rainfall a day before will be useful to take up the sowings.

Continue




No please.

You are partly correct because the amount of rainfall received is not clear from the statement to take up the sowings.


Soaking rain like 25 mm of rainfall a day before will be useful to take up the sowings.

Continue




You are right

Rains received during June to September, and October to December are monsoon rains.

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No please.

Rain during March to April are not monsoon rains. These rains are known as summer showers



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If you are not sure, the answer is:


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You are right

This break in rainfall coincides with pod development in groundnut and thus affect the pod formation and development.

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No please.

Please note the break in rainfall. Rains were received during flowering and harvesting stages and so, these stages may not be adversely affected due to moisture availability.


Breaks in rainfall during late August and early September coincides with pod development in groundnut, and thus affect the pod formation and development.

Continue




You are right

Higher temperatures over land than sea results in differential heating between land and sea. Consequent to this, air pressure will be higher on land compared to the sea. This pressure gradient brings moisture-laden winds towards land resulting in monsoon rains.

Continue




No please.


Higher temperatures over land than sea results in differential heating between land and sea. Consequent to this, air pressure will be higher on land compared to the sea. This pressure gradient brings moisture-laden winds towards land resulting in monsoon rains.

Continue




You are right

Near water body the air will be saturated with moisture. So, the RH will be quiet high (>60%) during summer in the coastal areas.

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No please.


Near water body the air will be saturated with moisture. So, the RH will be quiet high (>60%) during summer in the coastal areas.

Continue




You are right

Relative humidity is measured using hygrometer (Fig.)

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No please.

Barometer is used to measure air pressure (top Fig.).


Relative humidity is measured using hygrometer (bottom Fig.)

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No please.

Anemometer is used to measure wind velocity (top Fig.).


Relative humidity is measured using hygrometer (bottom Fig.)

Continue




If you are not sure, here is the answer:

Relative humidity is measured using hygrometer (Fig.)

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You are right

You will feel comfortable if RH is low. At high RH you will sweat more, feel sticky and uncomfortable.

Continue




No please.


At high RH you will sweat more, feel sticky and uncomfortable. You will feel comfortable if RH is low.

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You are right

Sunshine is recorded to calculate day length.

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No please.

Sunshine do not provide maximum and minimum temperatures.



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Continue




You are right

Mercury thermometer is used to measure maximum temperature.

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No please.

Alcohol thermometer is used to measure the minimum temperature.



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No please.

Wet and dry bulb thermometer is used to measure the relative humidity.



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Continue




You are right

There will not be any short-wave radiation during the nights due to the absence of sun. This results in lower temperatures during nights compared to the day temperatures.

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No please.



Continue






Continue




You are right

Air-pressure is measured using aneroid barometer (Fig.)

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No please.

Hygrometer (top Fig.) is used to measure relative humidity.


Air-pressure is measured using aneroid barometer (bottom Fig.).

Continue




No please.

Anemometer is used to measure wind velocity (top Fig.).


Air-pressure is measured using aneroid barometer (bottom Fig.).

Continue





Air-pressure is measured using aneroid barometer (Fig.).

Continue




You are right

The air pressure will be lower with less air. That is why you feel difficult to breath as you climb a hill or more floors in a high-raised building.

More the air, higher will be the pressure.

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No please.




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Continue




You are right

A low-pressure system indicates cyclonic winds and subsequent possibility of rain.

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No please.

A high-pressure system leads to cooler temperatures and clear skies.



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A high-pressure system leads to cooler temperatures and clear skies.

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You are right

Anemometer is used to measure wind (Fig.).

Continue




No please.

Air-pressure is measured using aneroid barometer (top Fig.).


Anemometer is used to measure wind (bottom Fig.).

Continue




No please.

Hygrometer (top Fig.) is used to measure relative humidity.


Anemometer is used to measure wind (Fig.).

Continue





Anemometer is used to measure wind (top Fig.).

Air-pressure is measured using aneroid barometer (middle Fig.).

Hygrometer (bottom Fig.) is used to measure relative humidity.

Continue




You are right

Winds move from a high-pressure system towards a low-pressure system.

Continue




No please.

The direction of winds between sea and land depends on the air pressure differences. If air pressure is higher over the land, then the winds move towards the sea and vice-versa.


Winds move from a high-pressure system towards a low-pressure system.

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You are right

The clouds in the picture are fair-weather clouds.

Continue




No please.



Continue






Continue




You are right

The clouds in the picture are rain-giving clouds.

Continue




No please.



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Virtual Academy for the Semi Arid Tropics Course on Crop-Weather Relationships Module III: Weather...

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