771. For orientation of a plane table with three points A, B and C, Bessel’s drill is
A. Align b through a and draw a ray towards c, align a through b and draw a ray towards c, finally align c through the point of intersection of the previously drawn rays
B. Align c through a and draw a ray towards b, align a through c and draw a ray towards b, finally align b through the point of intersection of the previously drawn rays
C. Align c through b and draw a ray towards a, align b through c and draw a ray towards a, finally align a, through the point of intersection of the previously, drawn rays
D. In the first two steps any two of the points may be used and a ray drawn towards the third point, which is sighted through the point of intersection of previously drawn rays in the final step.
772. To orient a plane table at a point with two inaccessible points, the method generally adopted, is
A. intersection
B. resection
C. radiation
D. two point problem.
773. The altitude of a circumpolar star is maximum when it is
A.(a) declination must be 0?
B. declination must be 90?
C. distance from the pole must be less than the latitude of the observer
D. hour angle must be 180?.
774. At lower culmination, the pole star moves
A. eastward
B. westward
C. northward
D. southward.
775. If a is the observed altitude, the refraction correction in seconds, is
A. 58″ cot a
B. 58″ tan a
C. 58 sin a
D. 58 cos a.
776. The correction for parallax, is
A. – 8″.8 cos a
B. + .8″ sin a
C. + 8″.8 cos a
D. – 8″.8 cos a.
777. A retarding force on a body does not
A. change the motion of the body
B. retard the motion of the body
C. introduce the motion of the body
D. none of these.
778. The force acting on a point on the surface of a rigid body may be considered to act
A. at the centre of gravity of the body
B. on the periphery of the body
C. on any point on the line of action of the force
D. at any point on the surface normal to the line of action of the force.
779. A number of forces acting simultaneously on a particle of a body
A. may not be replaced by a single force
B. may be replaced by a single force
C. may be replaced by a single force through C.G. of the body
D. may be replaced by a couple
780. Parallelogram Law of Forces states, “if two forces acting simultaneously on a particle be represented in magnitude and direction by two adjacent sides of a parallelogram, their resultant may be represented in magnitude and direction by
A. its longer side”
B. its shorter side”
C. the diagonal of the parallelogram which does not pass through the point of intersection of the forces”
D. the diagonal of the parallelogram which passes through the point of intersection of the forces”
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