Question

1. Give one distinguishing point between metal and non-metal based on their chemical reactivity.
2. Which element comes after (right) lithium in the periodic table?
3. Location & function of stomate in plant.
4. What is the range of vision of a normal eye?
5. Why are danger signal lights red in colour?
6. Write one function of the given symbol?
7. Write unit electric current?
8. Which sources produce AC and DC current? Write one source for each AC & DC.
SECTION – B Answer the following questions (Q No. 9 to 14) in short (Max 30 words). Each question carries 2 Marks. [12]
9. Give balanced chemical reaction of carbon dioxide with (a) Calcium oxide and (b) Water.
10. Write the name of following compounds. O || (a) CH3 – C – CH3 (c) H – C ≡ C – H (b) CH3CH2OH (d) CH3COOH 11. What is biomass? Explain biogas production method by schematic representation. 12. A. What will happen if we remove decomposers from an ecosystem? B Draw any food web.
13. An object 5cm in length is placed 25cm away from a converging lens of focal length 10cm, Find position, Size and nature of image formed?
14. What is the role of fuse in series connection with any electrical appliance? Which material is used for making fuse?

SECTION - C Answer the following questions (Q No. 15 to 24) in brief (Max 50words). Each question carries 3 Marks. [30]
15. Write balanced chemical equations for the following and identify the type of chemical reactions.

Answer 1

MetalsNon-Metals1. Oxides of metal are basic in nature.1. Oxides of non-metals are acidic in nature.2. Metals displace hydrogen from dilute acids.2. They cannot do so.3. Metals form chlorides which are electrovalent or ionic compounds.3. Non-metals form chlorides which are covalent compounds.4. they displace hydrogen from water4. They cannot do so.