The value of geocentric parallax to be added to the observed altitude of sun is

A triangle has a base x and an altitude y. A second triangle has a base twice the altitude of the first triangle, and an altitude twice the base of the first triangle. What is the area of the second triangle?

A

2xy

B

0.5xy

C

0.66xy

D

4xy

If flying height of a spacecraft is H, the length of air base is B and the parallax difference between two points is dp, then the difference in height

A

$${\text{h}} = \frac{{{\text{dp}}}}{{\frac{{\text{B}}}{{\text{H}}}}}$$

B

$${\text{h}} = \frac{{\text{B}}}{{\text{H}}} \times {\text{dp}}$$

C

$${\text{h}} = \frac{{{\text{dp}}}}{{\frac{{\text{H}}}{{\text{B}}}}}$$

D

$${\text{h}} = {\text{BHbp}}$$

The correction for parallax, is

A

- 8".8 cos α

B

+ .8" sin α

C

+ 8".8 cos α

D

- 8".8 cos α

The difference of parallax for a given difference in elevation is independent of

A

Focal length of the camera

B

Overall size of the photo graphs

C

Percentage of overlap

D

All the above

Parallax bar measures

A

Parallax

B

Height

C

Parallax difference

D

Height difference

The parallax of a point on the photograph is due to

A

Ground elevation

B

Flying height

C

Length of air base

D

All the above

If α is the observed altitude, the refraction correction in seconds, is

A

58" cot α

B

58" tan α

C

58 sin α

D

58 cos α

Evening sun is not a shot as the mid-day sun. What is the reason?

A

In the evening, radiations travel slowly

B

In the evening, the temperature of the sun decreases

C

Ozone in atmosphere absorbs more light in the evening

D

In the evening, radiations travel larger distance through atmosphere

A fraction becomes 6/5 when 5 is added to its numerator and becomes 1/2 when 4 is added to its denominator. What will be the value of the fraction?

A

8\/9

B

7\/10

C

7\/8

D

6\/11

the average age of 12 children is 20 years. If the age of one more child is added, the average decreased by 1. What is the age of child added later?

A

5

B

7

C

19

D

20

The value of geocentric parallax to be added to the observed altitude of sun is

Related Questions