If ? is the declination of the star and ? is the latitude of the observer then t

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Question
If ? is the declination of the star and ? is the latitude of the observer then the hour angle of the star at elongation is given by
Options
A. sin H = tan ? . cot ?
B. cos H = tan ? . cot ?
C. tan H = tan ? . cot ?
D. none of these.

Correct Answer

cos H = tan ? . cot ?

More questions

2. Most economical section of a circular channel for maximum discharge
Options
A. depth of water = 0.95 diameter of circular section
B. hydraulic mean depth = 0.286 diameter of circular section
C. wetted perimeter = 2.6 diameter of circular section
D. wetted perimeter = 2.83 depth of water
E. all the above.

3. If the atmospheric pressure on the surface of an oil tank (sp. gr. 0.8) is 0.1 kg/cm², the pressure at a depth of 2.5 m, is
Options
A. 1 metre of water
B. 2 metres of water
C. 3 metres of water
D. 3.5 metres of water
E. 4.0 metres of water.

4. If a gauge is installed perpendicular to the slope, its measurement is reduced by multiplying
Options
A. sine of the angle of inclination with vertical
B. cosine of the angle of inclination with vertical
C. tangent of the angle of inclination with vertical
D. calibration coefficient of the gauge.

5. In stone masonry, if stones are so placed that their layers are parallel to the direction of load, they
Options
A. split easily
B. are affected by moisture
C. both (a) and (b)
D. none of these.

7. Pick up the correct statement from the following :
Options
A. Rain which is intercepted by buildings, vegetations and other objects, is generally known as rainfall interception
B. The difference between the total rainfall and intercepted rainfall, is generally called ground rainfall
C. When rainfall exceeds the interception rainfall, water reaches the ground and infiltration starts
D. The maximum rate of absorbing water by the soil in any given condition, is known as infiltration capacity
E. All the above.

8. The deficiency in rain catch due to vertical acceleration of air forced upward over the gauge, is
Options
A. greater for heavy rain
B. greater for lighter rain
C. greater for large drops
D. lesser for small rain drops.

9. Pick up the correct statement from the following :
Options
A. mistakes arise from inattention, inexperience or carelessness
B. systematic errors persist and have regular effects in the survey performances
C. accidental errors occur inspite of every precaution is taken
D. all the above.

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