Pressure exerted by a sharp needle on a surface is
A) More than the pressure exerted by a blunt needle.
B) Less than the pressure exerted by a blunt needle.
C) Equal to the pressure exerted by a blunt needle.
D) None of these.
1 Answers
The total surface area of solid cylinder is `231 cm^(2)` and its curved surface area is `(2)/(3)` of the total surface area. Find the volume of the cy
Correct Answer - `269.5 cm^(3)`
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A force of 16N distributed uniformly on one surface of cube side 8cm. Find the pressure on the surface.
P=force/Area. P=16N/64×10-⁴ P=16N×10⁴/64m² P=2500 Pascal
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When pressure is exerted on lungs, the following one occurs.
(C) expiration
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The arcs which operate when you put your leg on sharp thing ………….
(A) Reflex arcs
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Make a stack of carrom coins on the carrom board. Give a sharp hit at the bottom of the stack with the striker.
D) Newton’s first law of motion
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a – Incisors have sharp edge, canines have sharp and pointed edges, b – Molars and premolars are blunt and flat.
D) Both a and b are true
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A student obtained a blurred image of an object on a screen by using a concave mirror. In order to obtain a sharp image on the screen,
D) either away from or towards, the screen depending upon the position of object
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A sharp knife can cut food much more easily because A) It produces greater pressure on the food.
A) It produces greater pressure on the food.
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Needles has a sharp tip, because A) Effective pressure is more due to smaller area of contact
A) Effective pressure is more due to smaller area of contact
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