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 points P and X are just meeting at the point of contact between the dials , and if dial 2 spins at exactly double the speed of dial 1, which of the following pairs of contact ?
A N and Y
B N and Z
C O and X
D O and Z
If points P and Y are just meeting at the point of contact between the dials , and if dial 1 spins at exactly three time the speed of dial 2, which of the following pairs of points will be the next pair to meet at the point of contact?
A N and X
B N and Z
C O and Y
D P and Z
Two circular dials of exactly the same size are mounted on a wall side by side in such a way that their perimeters touch at one point. Dial 1, which is on the left , spins clockwise around its center , and dial 2 , which is on the right spins counter clockwise around its center . (Assume that there is no friction at the point of contact between the dials.) Each dial is marked on its perimeter at three points that are at equale distances around the points arked ondial 1 are N, O, and P and the points marked on dial 2 are X, Y, and Z. If points O and Z are just meeting at the point of contact between the dials , and if dial 1 spins at the same speed as dial 2, what is the smallest number of revolutions of each dial that will bring O and Z together again?
A 1
B 2
C 3
D 4
The rolling contact bearings as compared to sliding contact bearings have
A Low starting and low running friction except at very high speeds
B Accuracy of shaft alignment
C Small overall dimensions
D All of the above
Indirect contact heat exchangers are preferred over direct contact heat exchangers, because
A Heat transfer co-efficient are high
B There is no risk of contamination
C There is no mist formation
D Cost of equipment is lower
The contact ratio is the ratio of
A length of pair of contact to the circular pitch
B length of arc of contact to the circular pitch
C length of arc of approach to the circular pitch
D length of arc of recess to the circular pitch
The contact ratio for gears is
A zero
B less than one
C greater than one
D none of the mentioned
A solute distributes itself between two non-miscible solvents in contact with each other in such a way that, at a constant temperature, the ratio of its concentrations in two layers is constant, irrespective of its total amount". This is
A The distribution law
B Followed from Margule's equation
C A corollary of Henry's law
D None of these
The acceleration of a flat-faced follower when it has contact with the flank of a circular arc cam, is given by
A $${\omega ^2}{\text{R}}\cos \theta $$
B $${\omega ^2}\left( {{\text{R}} - {{\text{r}}_1}} \right)\cos \theta $$
C $${\omega ^2}\left( {{\text{R}} - {{\text{r}}_1}} \right)\sin \theta $$
D $${\omega ^2}{{\text{r}}_1}\sin \theta $$

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