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All India Exam - 2011
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Q15 of 56 Page 1

An object its placed between infinity and the pole of a convex mirror. Draw a ray diagram and also state the position, the relative size and nature of the image formed.

When the object is placed between the infinity and the pole of a convex mirror, the ray diagram will be as follows:


The image formed will be behind the mirror between P and F. So the image is virtual, erect and diminished.


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13

Write chemical equations for what happen when

(i) Sodium metal is added to ethanoic acid


(ii) Solid sodium carbonate is added to ethanoic acid.


(iii) Ethanoic acid reacts with a dilute solution of sodium hydroxide.

14

The atomic number of an element is 16. Predict.

(i) the number of valence electrons in its atom;


(ii) its valences;


(iii) its group number;


(iv) whether it is a metal or non-metal;


(v) the nature is oxide formed by it;


(vi) the formula of it chloride;

16

What is the principal of reversibility of light? Show that the incident ray of light is parallel to the emergent ray of light when light falls obliquely on a side of a rectangular glass slab.

17

What eye defect is myopia? Describe with a neat diagram how this defect of vision can be corrected by using a suitable lens.

Questions · 56
All India Exam - 2011
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