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.
Electrochemical corrosion occurs
A Where the liquid electrolytes containing free ions are present
B Only in alloys
C Only in pure metals
D Due to direct chemical action of metal with oxygen
Though tin occurs lower than iron in the electrochemical series, yet it is coated on steel for corrosion protection, because of its
A Lower cost
B Abundant availability
C Resistance to vegetable acids as the tin plate are commercially used in 'canning' industry
D None of these
Which of the following does not come under the category of electrochemical corrosion?
A Corrosion in organic liquids
B Atmospheric corrosion in moist gas or air
C Soil corrosion as in the case of underground pipes
D Corrosion in sea water and molten metals
Corrosion involves exchange of electrons in __________ corrosion.
A Chemical
B Electrochemical
C Both A & B
D Neither A nor B
The deterioration of a metal by an electrochemical process is commonly termed as
A Erosion
B Corrosion
C Passivation
D Abrasion
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

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