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Instruments for measuring the intensity of incoming radiation are called
1. pyrheliometers
2. sunshine recorders
3. hygrometer
4. psychrometers
Correct Answer - Option 1 : pyrheliometersExplanationInstrumentMeasured quantity1. PyrheliometerSolar radiations coming directly from sun2. Sunshine recordersAmount of sunlight that a particular location receives throughout a day3. Hygrometerused to measure relative humidity4. PsychrometerMeasures hRead more
Correct Answer – Option 1 : pyrheliometers
Explanation
Instrument
Measured quantity
1. Pyrheliometer
Solar radiations coming directly from sun
2. Sunshine recorders
Amount of sunlight that a particular location receives throughout a day
3. Hygrometer
used to measure relative humidity
4. Psychrometer
Measures humidity
An unconfined aquifer of porosity 35%, permeability 40 m / day, and specific yield of 0.15 has an area of 100 km2. If the water table falls uniformly throughout the aquifer area by 0.2 m during a drought, the volume of water lost from storage is
1. 1.5 Mm3
2. 3.0 Mm3
3. 7.0 Mm3
4. 8.0 Mm3
Correct Answer - Option 2 : 3.0 Mm3Concept:Specific yield is defined as the volume of water released from storage by an unconfined aquifer per unitsurface area of aquifer per unit decline of the water table.When the above statement is expressed in quantitative form, it will be as below-Volume of watRead more
Correct Answer – Option 2 : 3.0 Mm3
Concept:
Specific yield is defined as the volume of water released from storage by an unconfined aquifer per unit
surface area of aquifer per unit decline of the water table.
When the above statement is expressed in quantitative form, it will be as below-
Volume of water lost = Specific yield × Drawdown × Area
Calculation:
Porosity = 35%,
Permeability = 40 m / day,
Specific yield = 0.15
Area = 100 km2
Drawdown = 0.2 m
Volume of water lost = Specific yield × Drawdown × Area
∴ Volume of water lost = 0.15 × 0.2 × 100 × 106 = 3.0 Mm3
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