Q5 of 56 Page 1

Why is sustainable management of natural resources necessary? Out of the two reuse and recycle which, in your opinion, is better to practice? Give reason.

Sustainable management of natural resources is necessary because it helps in judicious use of resources without overuse and compromising with the needs of future generation.

Out of reuse and recycle, reuse is better to practice because for recycling of materials, it requires energy as well as money. Moreover, only few of the materials can be recycled. Reuse is better practice as it encourages things again and again and also it is environment friendly.


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3

Which of the following are always at the second trophic level of food chains?

Carnivores, Autotrophs, Herbivores

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Draw a ray diagram to show the path of the reflected ray corresponding to an incident ray of light parallel to the principal axis of a convex mirror and show the angle of incidence and angle of reflection on it.

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Write the name and general formula of a chain of hydrocarbons in which an addition reaction with hydrogen is possible. State the essential condition for an addition reaction. Stating this condition, write a chemical equation giving the name of the reactant and the product of the reaction.

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Given below are some elements of the modem periodic table. Atomic number of the element is given in the parentheses: A(4), B(9), C(14), 0(19), E(20)

(a) Select the element that has one electron in the outermost shell. Also write the electronic configuration of this element.


(b) Which two elements amongst these belong to the same group? Give reason/for your answer.


(c) Which two elements amongst these belong to the same period? Which one of the two has bigger atomic radius?