Cross hairs in surveying telescopes, are fitted (A) In the objective glass (B) At the centre of the telescope (C) At the optical centre of the eye piece (D) In front of the eye piece

Cross hairs in surveying telescopes, are fitted
(A) In the objective glass
(B) At the centre of the telescope
(C) At the optical centre of the eye piece
(D) In front of the eye piece
by

1 Answer

Answer :

(D) In front of the eye piece
by

Related questions

The theodolites used for making tacheometric observations by optical wedge system, are (A) Provided with stadia hairs in front of eye piece (B) Not provided with stadia hairs at all (C) Fitted with a glass wedge inside the telescope (D) Fitted with a glass wedge in front of telescope

Description : The theodolites used for making tacheometric observations by optical wedge system, are (A) Provided with stadia hairs in front of eye piece (B) Not provided with stadia hairs at all (C) Fitted with a glass wedge inside the telescope (D) Fitted with a glass wedge in front of telescope

Last Answer : (D) Fitted with a glass wedge in front of telescope

The real image of an object formed by the objective must lie (A) In the plane of cross hairs (B) At the centre of the telescope (C) At the optical centre of the eye-piece (D) Anywhere inside the telescope

Description : The real image of an object formed by the objective must lie (A) In the plane of cross hairs (B) At the centre of the telescope (C) At the optical centre of the eye-piece (D) Anywhere inside the telescope

Last Answer : (A) In the plane of cross hairs

The imaginary line passing through the intersection of cross hairs and the optical centre of the objective, is known as (A) Line of sight (B) Line of collimation (C) Axis of the telescope (D) None of these

Description : The imaginary line passing through the intersection of cross hairs and the optical centre of the objective, is known as (A) Line of sight (B) Line of collimation (C) Axis of the telescope (D) None of these

Last Answer : (B) Line of collimation

Diaphragm of a surveying telescope is held inside (A) Eye-piece (B) Objective (C) Telescope tube at its mid point (D) Telescope at the end nearer the eye-piece

Description : Diaphragm of a surveying telescope is held inside  (A) Eye-piece  (B) Objective  (C) Telescope tube at its mid point  (D) Telescope at the end nearer the eye-piece

Last Answer : (D) Telescope at the end nearer the eye-piece

An internal focussing type surveying telescope, may be focussed by the movement of (A) Objective glass of the telescope (B) Convex-lens in the telescope (C) Concave lens in the telescope (D) Plano-convex lens in the telescope

Description : An internal focussing type surveying telescope, may be focussed by the movement of  (A) Objective glass of the telescope  (B) Convex-lens in the telescope  (C) Concave lens in the telescope  (D) Plano-convex lens in the telescope

Last Answer : (C) Concave lens in the telescope 

While viewing through a level telescope and moving the eye slightly, a relative movement occurs between the image of the levelling staff and the cross hairs. The instrument is (A) Correctly focussed (B) Not correctly focussed (C) Said to have parallax (D) Free from parallax

Description : While viewing through a level telescope and moving the eye slightly, a relative movement occurs between the image of the levelling staff and the cross hairs. The instrument is (A) Correctly focussed (B) Not correctly focussed (C) Said to have parallax (D) Free from parallax

Last Answer : (C) Said to have parallax

In a theodolite the line passing through the intersection of the horizontal and vertical cross hairs and the optical centre of the object glass and its continuation, is known as (a) Horizontal axis (b) Vertical axis (c) Line of collination (d) Line of sight (e) Either of c or d above*

Description : In a theodolite the line passing through the intersection of the horizontal and vertical cross hairs and the optical centre of the object glass and its continuation, is known as (a) Horizontal axis (b) Vertical axis (c) Line of collination (d) Line of sight (e) Either of c or d above*

Last Answer : e) Either of c or d above*

Which one of the following statements is not correc t? (a) Parallax error is eliminated when there is no change in the staff reading when eye is moved up and down (b) The objective lens is to be focused towards a white or bright background for clear visibility of cross-hairs (c) Temporary adjustments of the dumpy level are to be performed at every set up (d) The eyepiece need not be adjusted after the first set up when the same surveyor is taking readings

Description : Which one of the following statements is not correc t? (a) Parallax error is eliminated when there is no change in the staff reading when eye is moved up and down (b) The objective lens is ... (d) The eyepiece need not be adjusted after the first set up when the same surveyor is taking readings

Last Answer : (b) The objective lens is to be focused towards a white or bright background for clear visibility of cross-hairs

Radio telescopes are better than optical telescopes because - (1) they can detect faint galaxies which no optical telescope can (2) they can work even in cloudy conditions (3) they can work during the day and night (4) All of the above

Description : Radio telescopes are better than optical telescopes because - (1) they can detect faint galaxies which no optical telescope can (2) they can work even in cloudy conditions (3) they can work during the day and night (4) All of the above

Last Answer : (4) All of the above

Radio telescopes are better than optical telescopes because A. they can detect faint galaxies which no optical telescope can B. they can work even in cloudy conditions C. they can work during the day and night D. All of the above

Description : Radio telescopes are better than optical telescopes because A. they can detect faint galaxies which no optical telescope can B. they can work even in cloudy conditions C. they can work during the day and night D. All of the above

Last Answer : D. All of the above

Pick up the correct statement from the following: (A) A refracting telescope consists optically of two lenses (B) The principal axes of both the lenses coincide the optical axis of the telescope(C) The lens nearer the object to be viewed is convex and is called objective (D) All the above

Description : Pick up the correct statement from the following: (A) A refracting telescope consists optically of two lenses (B) The principal axes of both the lenses coincide the optical axis of the telescope (C) The lens nearer the object to be viewed is convex and is called objective (D) All the above

Last Answer : (D) All the above

The diaphragm of a stadia theodolite is fitted with two additional (A) Horizontal hairs (B) Vertical hairs (C) Horizontal and two vertical hairs (D) None of these

Description : The diaphragm of a stadia theodolite is fitted with two additional (A) Horizontal hairs (B) Vertical hairs (C) Horizontal and two vertical hairs (D) None of these

Last Answer : (A) Horizontal hairs

The Huygens telescope eye piece (A) Is aplanatic (B) Achromatic (C) Both (a) and (b) (D) Neither (a) nor (b)

Description : The Huygens telescope eye piece (A) Is aplanatic (B) Achromatic (C) Both (a) and (b) (D) Neither (a) nor (b)

Last Answer : (C) Both (a) and (b)

In a theodolite a condition arising when the image formed by the objective is not in the plane of cross hairs is known as (a) Parallax* (b) Out of sight (c) Out of place (d) Transiting

Description : In a theodolite a condition arising when the image formed by the objective is not in the plane of cross hairs is known as (a) Parallax* (b) Out of sight (c) Out of place (d) Transiting

Last Answer : (a) Parallax*

The Event Horizon Telescope required multiple telescopes, with split-second synchronization, to capture the image of the M87 black hole. How many telescopes were used? -Space

Description : The Event Horizon Telescope required multiple telescopes, with split-second synchronization, to capture the image of the M87 black hole. How many telescopes were used? -Space

Last Answer : Recognizing their vision and leadership within the Event Horizon Telescope (EHT), the National Academy of Sciences (NAS) awards Shep Doeleman and Heino Falcke the Henry Draper Medal. ... a recent, original investigation in astronomical physics of sufficient importance and benefit to science.

Resolving power of a telescope depends on (A) The diameter of the aperture (B) The pupil aperture of the eye (C) The diameter of the object glass (D) All the above

Description : Resolving power of a telescope depends on (A) The diameter of the aperture (B) The pupil aperture of the eye (C) The diameter of the object glass (D) All the above

Last Answer : (D) All the above

Pick up the correct statement from the following: (A) The eyepiece plays no part in defining the line of sight (B) The diaphragm plays no part in defining the line of sight (C) The optical centre of the objective plays no part in defining the line of sight (D) None of these

Description : Pick up the correct statement from the following: (A) The eyepiece plays no part in defining the line of sight (B) The diaphragm plays no part in defining the line of sight (C) The optical centre of the objective plays no part in defining the line of sight (D) None of these

Last Answer : (A) The eyepiece plays no part in defining the line of sight

The ratio of the angles subtended at the eye, by the virtual image and the object, is known as telescopes (A) Resolving power (B) Brightness (C) Field of view (D) Magnification

Description : The ratio of the angles subtended at the eye, by the virtual image and the object, is known as telescopes (A) Resolving power (B) Brightness (C) Field of view (D) Magnification

Last Answer : (D) Magnification

Removal of parallax, may be achieved by focussing (A) The objective (B) The eye-piece (C) The objective and the eye-piece (D) None of these

Description : Removal of parallax, may be achieved by focussing  (A) The objective  (B) The eye-piece  (C) The objective and the eye-piece  (D) None of these 

Last Answer : (C) The objective and the eye-piece 

In chain surveying, perpendiculars to the chain line are set out by (A) A theodolite (B) A prismatic compass (C) A level (D) An optical square

Description : In chain surveying, perpendiculars to the chain line are set out by (A) A theodolite (B) A prismatic compass (C) A level (D) An optical square

Last Answer : (D) An optical square

Large astronomical telescopes always use as objective (a) Lens (b) Mirror (c) Combination of lenses (d) None of the above

Description : Large astronomical telescopes always use as objective (a) Lens (b) Mirror (c) Combination of lenses (d) None of the above

Last Answer : Ans:(a)

Are radio telescopes detect objects that optical telescopes cannot?

Description : Are radio telescopes detect objects that optical telescopes cannot?

Last Answer : Yes, that is correct.

To avoid large centering error with very short legs, observations are generally made (A) To chain pins (B) By using optical system for centering the theodolite (C) To a target fixed on theodolite tripod on which theodolite may be fitted easily (D) All the above

Description : To avoid large centering error with very short legs, observations are generally made (A) To chain pins (B) By using optical system for centering the theodolite (C) To a target fixed on theodolite tripod on which theodolite may be fitted easily (D) All the above

Last Answer : (C) To a target fixed on theodolite tripod on which theodolite may be fitted easily

A dumpy level is set up with its eye-piece vertically over a peg . The height from the top of peg to the centre of the eye-piece is 1.540 m and the reading on peg is 0.705 m. The level is then setup over . The height of the eye-piece above peg is 1.490 m and a reading on is 2.195 m. The difference in level between and is (A) 2.900 m (B) 3.030 m (C) 0.770 m (D) 0.785 m

Description : A dumpy level is set up with its eye-piece vertically over a peg . The height from the top of peg to the centre of the eye-piece is 1.540 m and the reading on peg is 0.705 m. The level is then setup over . The height ... in level between and is (A) 2.900 m (B) 3.030 m (C) 0.770 m (D) 0.785 m

Last Answer : (C) 0.770 m

In an internal focusing telescope (A) The objective is at a fixed distance from the diaphragm (B) The focusing is done by the sliding of a divergent lens (C) The focusing divergent lens is situated at about the middle of the tube (D) All the above

Description : In an internal focusing telescope (A) The objective is at a fixed distance from the diaphragm (B) The focusing is done by the sliding of a divergent lens (C) The focusing divergent lens is situated at about the middle of the tube (D) All the above

Last Answer : (D) All the above

In optical reading instruments (A) The vertical circle is usually continuous from 0° to 359° (B) The readings increase when the telescope is elevated in the face left position (C) The readings decrease when the telescope is elevated in the face right position (D) All the above

Description : In optical reading instruments (A) The vertical circle is usually continuous from 0° to 359° (B) The readings increase when the telescope is elevated in the face left position (C) The readings decrease when the telescope is elevated in the face right position (D) All the above

Last Answer : (D) All the above

Pick up the correct statement from the following: (A) If the image of the object does not fall on the plane of the cross-lines, parallax exists (B) Parallax has nothing to do with the eyepiece (C) The eyepiece is adjusted for clear vision of the cross hairs (D) All the above

Description : Pick up the correct statement from the following: (A) If the image of the object does not fall on the plane of the cross-lines, parallax exists (B) Parallax has nothing to do with the eyepiece (C) The eyepiece is adjusted for clear vision of the cross hairs (D) All the above

Last Answer : (D) All the above

Pick up the incorrect statement regarding a master trap from the following: (A) It is provided in between the lower end of the house drain and the street sewer (B) It is provided a cleaning eye at the top of the trap (C) The mica flap valve which opens inwards only, is fitted at the top of the inlet pipe (D) The water seal is less than that of ordinary traps

Description : Pick up the incorrect statement regarding a master trap from the following: (A) It is provided in between the lower end of the house drain and the street sewer (B) It is provided a cleaning eye at the ... fitted at the top of the inlet pipe (D) The water seal is less than that of ordinary traps

Last Answer : (D) The water seal is less than that of ordinary traps

Magnification of compound microscope is not connected with (a) numerical aperture (b) focal length of objective (c) focal length of eye piece (d) tube length.

Description : Magnification of compound microscope is not connected with (a) numerical aperture (b) focal length of objective (c) focal length of eye piece (d) tube length.

Last Answer : (a) numerical aperture

An object is placed beyond 2F, in front of a convex lens, image will be formed : (a) between F and 2F (b) at focus (c) at the centre of curvature (d) between focus and Optical centre

Description : An object is placed beyond 2F, in front of a convex lens, image will be formed : (a) between F and 2F (b) at focus (c) at the centre of curvature (d) between focus and Optical centre

Last Answer : (a) between F and 2F

When object is placed _______ in front of convex lens than image formed is virtual, erect, magnified and on same side beyond F . a) between optical centre and F b)At F c)between F and 2F d)2F

Description : When object is placed _______ in front of convex lens than image formed is virtual, erect, magnified and on same side beyond F . a) between optical centre and F b)At F c)between F and 2F d)2F

Last Answer : a) between optical centre and F

In a theodolite (A) The telescope axis is perpendicular to transit axis (B) The axis of rotation is perpendicular to transit axis (C) The telescope axis, the transit axis and the rotation axis pass through the centre of theodolite (D) All the above

Description : In a theodolite (A) The telescope axis is perpendicular to transit axis (B) The axis of rotation is perpendicular to transit axis (C) The telescope axis, the transit axis and the rotation axis pass through the centre of theodolite (D) All the above

Last Answer : (D) All the above

The ratio of the distances at which a stated length can be distinguished by the telescope and the human eye, respectively, is called (A) Brightness of telescope (B) Magnification of telescope (C) Resolving power of telescope (D) None of these

Description : The ratio of the distances at which a stated length can be distinguished by the telescope and the human eye, respectively, is called (A) Brightness of telescope (B) Magnification of telescope (C) Resolving power of telescope (D) None of these

Last Answer : (C) Resolving power of telescope

In a telescope the object glass of focal length 14 cm, is located at 20 cm from the diaphragm. The focussing lens is midway between them when a staff 16.50 m away is focussed. The focal length of the focussing lens, is (A) 5.24 cm (B) 6.24 cm (C) 7.24 cm (D) 8.24 cm

Description : In a telescope the object glass of focal length 14 cm, is located at 20 cm from the diaphragm. The focussing lens is midway between them when a staff 16.50 m away is focussed. The focal length of the focussing lens, is (A) 5.24 cm (B) 6.24 cm (C) 7.24 cm (D) 8.24 cm

Last Answer : (C) 7.24 cm

What is an endoscope? (1) It is an optical instrument used to see inside the alimentary canal (2) It is a device which is fitted on the chest of the patient to regularize the irregular heart beats (3) It is an instrument used for examining ear disorders (4) It is an instrument for recording electrical signals produced by human muscles

Description : What is an endoscope? (1) It is an optical instrument used to see inside the alimentary canal (2) It is a device which is fitted on the chest of the patient to regularize the ... used for examining ear disorders (4) It is an instrument for recording electrical signals produced by human muscles

Last Answer : (1) It is an optical instrument used to see inside the alimentary canal Explanation: Endoscopymeans looking inside and typically refers to looking inside the body for medical reasons using ... : breathing disorders; chronic diarrhea; internal bleeding; irritable bowel syndrome; stomach ulcers, etc.

What is an endoscope ? (1) It is an optical instrument used to see inside the alimentary canal (2) It is a device which is fitted on the chest of the patient to regularise the irregular heart beats (3) It is an instrument used for examining ear disorders (4) It is an instrument for recording electrical signals produced by human muscles

Description : What is an endoscope ? (1) It is an optical instrument used to see inside the alimentary canal (2) It is a device which is fitted on the chest of the patient to regularise the ... used for examining ear disorders (4) It is an instrument for recording electrical signals produced by human muscles

Last Answer :  It is an optical instrument used to see inside the alimentary canal

To increase the magnifying power of telescope, we should increase (a) The focal length of the objective (b) The focal length of the eyepiece (c) Aperture of the objective (d) Aperture of the eyepiece

Description : To increase the magnifying power of telescope, we should increase (a) The focal length of the objective (b) The focal length of the eyepiece (c) Aperture of the objective (d) Aperture of the eyepiece

Last Answer : Ans:(a)

The magnifying power of an astronomical telescope can be decreased by – (1) decreasing the focal length of the eyepiece (2) increasing the focal length of the eyepiece (3) increasing the focal length of the objective (4) None of these

Description : The magnifying power of an astronomical telescope can be decreased by – (1) decreasing the focal length of the eyepiece (2) increasing the focal length of the eyepiece (3) increasing the focal length of the objective (4) None of these

Last Answer : (2) increasing the focal length of the eyepiece Explanation: The magnifying power (M) of astronomical is given by M = (focal length of objective)/(focal length of eye piece). This ... piece should be small. Similarly, for decreased magnification, focal length of eye piece should be increased.

The magnifying power of an astronomical telescope can be decreased by – (1) decreasing the focal length of the eyepiece (2) increasing the focal length of the eyepiece (3) increasing the focal length of the objective (4) None of these

Description : The magnifying power of an astronomical telescope can be decreased by – (1) decreasing the focal length of the eyepiece (2) increasing the focal length of the eyepiece (3) increasing the focal length of the objective (4) None of these

Last Answer : (2) increasing the focal length of the eyepiece Explanation: The magnifying power (M) of astronomical is given by M = (focal length of objective)/(focal length of eye piece). This ... piece should be small. Similarly, for decreased magnification, focal length of eye piece should be increased.

The magnifying power of an astronomical telescope can be decreased by (1) decreasing the focal length of the eyepiece (2) increasing the focal length of the eyepiece (3) increasing the focal length of the objective (4) None of these

Description : The magnifying power of an astronomical telescope can be decreased by (1) decreasing the focal length of the eyepiece (2) increasing the focal length of the eyepiece (3) increasing the focal length of the objective (4) None of these 

Last Answer :  increasing the focal length of the eyepiece

If f1 and f2 are the distances from the optical centre of a convex lens of focal length to conjugate two points P1 and P2 respectively, the following relationship holds good (A) f = f1 + f2 (B) f = ½ (f1 + f2) (C) 1/f = 1/f1 + 1/f2 (D) None of these

Description : If f1 and f2 are the distances from the optical centre of a convex lens of focal length to conjugate two points P1 and P2 respectively, the following relationship holds good (A) f = f1 + f2 (B) f = ½ (f1 + f2) (C) 1/f = 1/f1 + 1/f2 (D) None of these

Last Answer : (C) 1/f = 1/f1 + 1/f2

Pick up the correct statement from the following: (A) The diaphragm is placed between eyepiece and the objective but nearer to the former (B) The diaphragm is placed between the eyepiece and objective but nearer to the later (C) The outer component of the objective is a double-convex lens of crown glass (D) All the above

Description : Pick up the correct statement from the following: (A) The diaphragm is placed between eyepiece and the objective but nearer to the former (B) The diaphragm is placed between the eyepiece and objective ... outer component of the objective is a double-convex lens of crown glass (D) All the above

Last Answer : (D) All the above

The piece of a brick cut along the centre of width in such a way that its length is equal to that of full brick, is called (A) Half brick (B) Queen closer (C) King closer (D) Bevelled closer

Description : The piece of a brick cut along the centre of width in such a way that its length is equal to that of full brick, is called (A) Half brick (B) Queen closer (C) King closer (D) Bevelled closer

Last Answer : Answer: Option B

An angle of 45° with a chain line may be set out with (A) Optical square (B) Open cross staff (C) French cross staff (D) Prismatic square

Description : An angle of 45° with a chain line may be set out with  (A) Optical square  (B) Open cross staff  (C) French cross staff  (D) Prismatic square

Last Answer : (C) French cross staff

In the design of a front counterfort in a counterfort retaining wall, the main reinforcement is provided on (i) Bottom face near counterfort (ii) Top face near counterfort (iii) Bottom face near centre of span (iv) Top face near centre of span The correct answer is (A) Only (i) (B) Only (ii) (C) Both (i) and (iv) (D) Both (ii) and (iii)

Description : In the design of a front counterfort in a counterfort retaining wall, the main reinforcement is provided on (i) Bottom face near counterfort (ii) Top face near counterfort (iii) Bottom face near centre of span (iv) Top ... ) (B) Only (ii) (C) Both (i) and (iv) (D) Both (ii) and (iii)

Last Answer : Answer: Option C

In chain surveying tie lines are primarily provided (A) To check the accuracy of the survey (B) To take offsets for detail survey(C) To avoid long offsets from chain lines (D) To increase the number of chain lines

Description : In chain surveying tie lines are primarily provided  (A) To check the accuracy of the survey  (B) To take offsets for detail survey  (C) To avoid long offsets from chain lines  (D) To increase the number of chain lines 

Last Answer : (C) To avoid long offsets from chain lines 

Geodetic surveying is undertaken (A) For production of accurate maps of wide areas (B) For developing the science of geodesy (C) Making use of most accurate instruments and methods of observation (D) All the above

Description : Geodetic surveying is undertaken  (A) For production of accurate maps of wide areas  (B) For developing the science of geodesy  (C) Making use of most accurate instruments and methods of observation  (D) All the above 

Last Answer : (D) All the above 

The accuracy of measurement in chain surveying, does not depend upon (A) Length of the offset (B) Scale of the plotting (C) Importance of the features (D) General layout of the chain lines

Description : The accuracy of measurement in chain surveying, does not depend upon (A) Length of the offset (B) Scale of the plotting (C) Importance of the features (D) General layout of the chain lines

Last Answer : (D) General layout of the chain lines