Related Questions

Pharmacists recently conducted a study with respect to the reasons their customers purchased eye drops to soothe eye dryness. Dry eyes were more frequently experienced by customers who wore contact lenses than by custorners who did not wear contact lenses. The pharmacists concluded that wearing contact lenses, by itself, can cause contact wearers to have dry eyes.
A An inherited condition can cause both weak eyesight and dry eyes
B Physical exertion causes dry eyes in many people who wear contact lenses.
C Most people who have dry eyes do not wear contact lenses.
D Most people who wear contact lenses do not have dry eyes.
If the resultant of two equal forces has the same magnitude as either of the forces, then the angle between the two forces is
A 30°
B 60°
C 90°
D 120°
When the two elements of a pair have a surface contact when relative motion takes place and the surface of one element slides over the surface of the other, the pair formed is known as a
A lower pair
B higher pair
C self-closed pair
D force-closed pair
When the nature of contact between the elements of a pair is such that it can only slide relative to the other, the pair is known as a
A Screw pair
B Spherical pair
C Turning pair
D Sliding pair
When the nature of contact between the elements of a pair is such that one element can turn about the other by screw threads, the pair is known as a
A Screw pair
B Spherical pair
C Turning pair
D Sliding pair
Three forces acting on a rigid body are represented in magnitude, direction and line of action by the three sides of a triangle taken in order. The forces are equivalent to a couple whose moment is equal to
A Area of the triangle
B Twice the area of the triangle
C Half the area of the triangle
D None of these
Coplanar non-concurrent forces are those forces which __________ at one point, but their lines of action lie on the same plane.
A Meet
B Do not meet
C Either ‘A’ or ‘B’
D None of these
Concurrent forces are those forces whose lines of action
A Lie on the same line
B Meet at one point
C Meet on the same plane
D None of these
The forces which meet at one point, but their lines of action __________ on the same plane, are Known as non-coplanar concurrent forces.
A Lie
B Do not lie
C Either A or B
D None of these
A rigid body, under the action of external forces, can be replaced by two masses placed at a fixed distance apart. The two masses form an equivalent dynamical system, if
A The sum of the two masses is equal to the total mass of body
B The center of gravity of the two masses coincides with that of the body
C The sum of mass moment of inertia of the masses about their center of gravity is equal to the mass moment of inertia of the body
D All of the above

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