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Physics

Fluid-Mechanics

Easy

Question

$W a t e r space f r o m space a space p i p e space i s space c o m i n g space a t space a space r a t e space o f space 100 space l i t e r s space p e r space m i n u t e. space I f space t h e space r a d i u s space o f space t h e space p i p e space i s space 5 space c m comma space t h e space R e y n o l d s space n u m b e r space f o r space t h e space f l o w space i s space o f space t h e space o r d e r space o f space minus space left parenthesis d e n s i t y space o f space w a t e r space equals space 1000 space k g divided by m cubed comma space c o e f f i c i e n t space o f space v i s cos i t y space o f space w a t e r space equals space 1 space m P a space s right parenthesis space$

$10^{4}$
$10^{3}$
$10^{2}$
$10^{6}$

The correct answer is: $10 to the power of 4$

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$A space c y l i n d r i c a l space c a p i l l a r y space t u b e space o f space 0.2 space m m space r a d i u s space i s space m a d e space b y space j o i n i n g space t w o space c a p i l l a r i e s space T subscript 1 space a n d space T subscript 2 space o f space d i f f e r e n t space m a t e r i a l s space h a v i n g space w a t e r space c o n t a c t space a n g l e s space o f space 0 to the power of 0 space a n d space 60 to the power of 0 comma space r e s p e c t i v e l y. space T h e space c a p i l l a r y space t u b e space i s space d i p p e d space v e r t i c a l l y space i n space w a t e r space i n space t w o space d i f f e r e n t space c o n f i g u r a t i o n s comma space c a s e space I space a n d space I I space a s space s h o w n space i n space f i g u r e. space W h i c h space o f space t h e space f o l l o w i n g space o p t i o n left parenthesis s right parenthesis space i s left parenthesis a r e right parenthesis space c o r r e c t ? text (Surface tension of water end text equals 0.075 straight N divided by straight m comma text density of water end text equals 1000 kg divided by straight m cubed comma text take end text open straight g equals 10 straight m divided by straight s squared close parentheses$

$A space c y l i n d r i c a l space c a p i l l a r y space t u b e space o f space 0.2 space m m space r a d i u s space i s space m a d e space b y space j o i n i n g space t w o space c a p i l l a r i e s space T subscript 1 space a n d space T subscript 2 space o f space d i f f e r e n t space m a t e r i a l s space h a v i n g space w a t e r space c o n t a c t space a n g l e s space o f space 0 to the power of 0 space a n d space 60 to the power of 0 comma space r e s p e c t i v e l y. space T h e space c a p i l l a r y space t u b e space i s space d i p p e d space v e r t i c a l l y space i n space w a t e r space i n space t w o space d i f f e r e n t space c o n f i g u r a t i o n s comma space c a s e space I space a n d space I I space a s space s h o w n space i n space f i g u r e. space W h i c h space o f space t h e space f o l l o w i n g space o p t i o n left parenthesis s right parenthesis space i s left parenthesis a r e right parenthesis space c o r r e c t ? text (Surface tension of water end text equals 0.075 straight N divided by straight m comma text density of water end text equals 1000 kg divided by straight m cubed comma text take end text open straight g equals 10 straight m divided by straight s squared close parentheses$

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A lens always forms a virtual, upright, and diminished image of an object placed in front of it. It is a ____ lens.

A lens always forms a virtual, upright, and diminished image of an object placed in front of it. It is a ____ lens.

What kind of images does a convex lens not form?

What kind of images does a convex lens not form?

The lens of a pair of spectacles used by a person is thinner in the middle and thicker towards the edges. The lens used in the spectacles is ____.

The lens of a pair of spectacles used by a person is thinner in the middle and thicker towards the edges. The lens used in the spectacles is ____.

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A concave lens forms a virtual, upright, and diminished image of an object ____.

A concave lens forms a virtual, upright, and diminished image of an object ____.

A lens can only form a virtual, upright, and diminished images irrespective of the distance between the lens and the object. It is a ____ lens.

A lens can only form a virtual, upright, and diminished images irrespective of the distance between the lens and the object. It is a ____ lens.

In the setup shown in the picture below, the sun rays are focused on a paper by a magnifying glass, which results in the paper catching fire. If the magnifying glass was replaced by a concave lens, the paper does not catch fire. Why?

In the setup shown in the picture below, the sun rays are focused on a paper by a magnifying glass, which results in the paper catching fire. If the magnifying glass was replaced by a concave lens, the paper does not catch fire. Why?

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The angle between the incident ray and the emergent ray is not equal to ____ degrees when the light gets refracted through a spherical lens.

The angle between the incident ray and the emergent ray is not equal to ____ degrees when the light gets refracted through a spherical lens.

Concave lenses are also called ____ lenses.

Concave lenses are also called ____ lenses.

When a parallel beam of light falls on a surface of a concave lens it the rays of light in such a way that they appear to originate from a point called .

When a parallel beam of light falls on a surface of a concave lens it the rays of light in such a way that they appear to originate from a point called .

parallel

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