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Q1. | The defect of a lens whereby rays of white light proceeding from a point get dispersed into their components and conveyed to various foci, forming a blurred and coloured image is known as. |

A. | chromatic aberration [Correct Answer] |

B. | spherical aberration [Wrong Answer] |

C. | astigmatism [Wrong Answer] |

D. | coma. [Wrong Answer] |

View Answer
Explanation:-
Answer : ADiscuss it below :Himanshu Gupta Said on 2019-06-24 09:15:54Chromatic : Blur Spherical : Aplantic Hygen's : Both !! OOPS Login [Click here] is required to post your answer/resultHelp other students, write article, leave your comments |

**Also Read Similar Questions Below :**

⇒ For the construction of highway (or railway).

longitudinal sections are required

cross sections are required

both longitudinal and cross sections are required

none of these.

⇒ Perpendicular offset from a tangent to the junction of a transition curve and circular curve is equal to.

shift

twice the shift

thrice the shift

four times the shift.

⇒ Contour interval is

inversely proportional to the scale of the map

directly proportional to the flatness of ground

larger for accurate works

larger if the time available is more

⇒ Check lines (or proof lines) in Chain Surveying, are essentially required.

to plot the chain lines

to plot the offsets

to indicate the accuracy of the survey work

to increase the out-turn

⇒ Location of contour gradient for a high way is best set out from.

ridge down the hill

saddle down the hill

bottom to the ridge

bottom to the saddle.

⇒ Which of the following errors can be neutralised by setting the level midway between the two stations ?

error due to curvature only

error due to refraction only

error due to both curvature and re-fraction

none of the above

⇒ The reduced level of a floor is 99.995 m, the staff reading on the floor is 1.505 m. If the inverted staff reading against the roof is 1.795 m, the floor level below the slab, is.

3.290 m

3.300 m

3.275 m

2.790 m

⇒ Direct method of contouring is

a quick method

adopted for large surveys only

most accurate method

suitable for hilly terrains

⇒ If the declination of the needle is 10° W.

each of the whole circle reckoning has to be micros by 10Â°

in the quadrantal method, the correction is positive in the 1st and 3rd quadrants

in the quadrantal method, the corrections is negative in 2nd and 4th quadrants

all the above.

⇒ In a constant level tube, size of the bubble remains constant because upper wall is.

of relatively larger radius

of relatively smaller radius

flat

convex downwards.

⇒ The back staff reading on a B.M. of R.L. 500.000 m is 2.685 m. If foresight reading on a point is 1.345 m, the reduced level of the point, is.

502.685 m

501.345 m

501.340 m

504.030 m

⇒ The permissible limits of errors in chaining for measurement on rough or hilly ground is

1 : 2000

1 : 1000

1 : 500

1 : 250

⇒ For preparation of a contour plan for a route survey.

method of squares is used

method of trace contour is used

method of cross profile is used

indirect method of contouring is used.

⇒ Magnetic bearing of a survey line at any place.

remains constant

changes systematically

varies differently in different months of the year

is always greater than true bearing.

⇒ An error under the same conditions always of the same size and sign is called as

Uniform error

Systematic error

Cumulative error

Any of (B) and (C) above

⇒ Keeping the instrument height as 1.5 m, length of staff 4 m, the up gradient of the ground 1 in 10, the sight on the up slope must be less than

25 cm

20 m

45 m

10 m

⇒ If a tacheometer is fitted with an anal-latic lens.

additive constant is 100, multiplying constant is zero

multiplying constant is 100, additive constant is zero

both multiplying and additive constants are 100

both multiplying and additive constants are 50.

⇒ Pick up the correct statement from the following :

a refracting telescope consists optically of two lenses

the principal axes of both the lenses coincide the optical axis of the telescope

the lens nearer the object to be viewed is convex and is called objective

all the above.

⇒ One of the Lehmann's rules of plane tabling, is.

location of the instrument station is always distant from each of the three rays from the known points in proportion to their distances

when looking in the direction of each of the given points, the instrument station will be on the right side of one and left side of the other ray

when the instrument station is outside the circumscribing circle its location is always on the opposite side of the ray to the most distant point as the inter-section of the other two rays

none of these.

⇒ A bearing noted 45° NE represents

Quadrantal system

Whole circle system

Reduced bearing system

None of the above

⇒ Chain surveying is well adopted for.

small areas in open ground

small areas with crowded details

large areas with simple details

large areas with difficult details.

⇒ Principle of surveying followed to prevent accumulation of errors is

To work from whole to the part

To work from part to whole

Both (A) and (B)

None of the above

⇒ Method used for chaining on sloping ground is

By stepping method

By hypotenusal allowance method

By clinometer method

Both (A) and (B) above

⇒ The longest chainline passing through the centre of the area is known as

Base line

Tie line

Check line

All the above

⇒ The angle between the prolongation of the preceding line and the forward line of a traverse is called

deflection angle

included angle

direct angle

none of the above

⇒ Pick up the correct statement from the following :

A level surface is perpendicular at all points to the direction of gravity

A level line lies in level surface

A horizontal surface is normal to the direction of gravity at only one point

All the above.

⇒ The horizontal angle between true meridian and magnetic meridian, is known.

bearing

magnetic declination

dip

convergence.

⇒ Which one of the following statements is correct ?

when the axes of rotation of the graduated circle and the verniers are not coincident, the instrument possesses eccentricity

the mean of the readings of the two verniers gives correct reading free from the eccentricity

one vernier may be used if the readings of two verniers differ by a constan

all the above.

⇒ The difference in the lengths of an arc and its subtended chord on the earth surface for a distance of 18.2 km, is only.

1 cm

5 cm

10 cm

100 cm.

⇒ Which of the following methods of offsets involves less measurement on the ground?

method of perpendicular offsets

method of oblique offsets

method of ties

all involve equal measurement on the ground