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Physics

Heat

Easy

Question

$A space t h e r m a l l y space i n s u l a t e d space v e s s e l space c o n t a i n s space 150 space g space o f space w a t e r space a t space 0 degree C. space T h e n space t h e space a i r space f r o m space t h e space v e s s e l space i s space p u m p e d space o u t space a d i a b a t i c a l l y. space A space f r a c t i o n space o f space w a t e r space t u r n s space i n t o space i c e space a n d space t h e space r e s t space e v a p o r a t e s space a t space 0 degree C space i t s e l f. space T h e space m a s s space o f space e v a p o r a t e d space w a t e r space w i l l space b e space c l o s e s t space t o space – space left parenthesis L a t e n t space h e a t space o f space v a p o r i z a t i o n space o f space w a t e r space equals space 2.10 space cross times space 10 to the power of 6 space J k g to the power of negative 1 end exponent space a n d space L a t e n t space h e a t space o f space f u s i o n space o f space w a t e r space equals space 3.36 space cross times space 10 to the power of 5 space J space k g to the power of negative 1 end exponent right parenthesis$

$130 g$
$35 g$
$150 g$
$20 g$

The correct answer is: $20 space g$

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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.

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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 ____.

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 ____.

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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?

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.

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