(a)Name its type;
(b) Name the oxidizing & reducing agents. [1]
2. Translate & balance the following: [1]
(a) Hydrogen gas combines with nitrogen to give ammonia;
(b) Barium chloride reacts with Aluminium Sulphate ®________ (complete it!).
3. Write the chemical name of Washing Soda & Bleaching powder. [1]
4. Write name of functional groups in RCOOR’ & RCH2R’. [1]
5 Out of a bulb 40W-220V and 100W-220V which one would glow brighter when connected in series?(show working of your answer)[1]
6. Define Chlor alkali [1]
7. State Joule’s law of heating. [1]
8.State the conditions when it is possible to obtain a real image from a convex mirror .Suppose the focal length of a concave mirror is ‘f’.What is the range of the object distance from the pole for its erect image. [2]9.What kind of oxide is Al2O3? Explain with examples.
State 1 difference between calcinations & roasting. [2]
10. Consider the circuit given on the next page find total current, eq.resistance, and voltage drop across each resistor . (Each resistance of 1 W each). [2]
12. State and explain all the Cartesian conventions for ray optics. [2]
13. An object placed 0.5m from a lens produces a virtual image 10cm from it. Find its possible focal length(s) and nature of the lens. [2]
14. A metal compound reacts with dil. HCl to give an effervescence which extinguishes a lighted candle. If CaCl2 is also produced during the reaction
(a) Write complete reaction;
(b)The result when the gas is passed through lime for a prolonged period of time.
(c)Name with example the type of reaction in which: (i) Outside of reaction of reaction vessel becomes cold; (ii) Insoluble substance is formed; [3]
15.Differentiate between an ore and a mineral. Name an ore of mercury.Explain (with chemical equations) how Hg is extracted from the said ore. [2]
16. Draw a neatly labeled diagram of the human eye (interior view).State the function of Ciliary muscles, Lens and aqueous humor. [3]
17. What inference do you draw from the following?
SN
b) Away from the coil and
c) When the magnet remains stationary (after moving towards the coil) for 5 seconds. ` [3]
20. Visualize Period 2 and 3 and group 1-18 of the modern periodical table (without actually seeing) and answer the following questions narrating the reasons.
a) Which element would have bigger atomic radius Li or O?
b) Compounds of which elements would be predominantly ionic?c) Out of elements of group 13 and 17, which would produce
more number of compounds?d) Compounds of which groups would have higher melting point?
e) Elements of which group and period show metalloid character? [5]
20. What is a commutator? What is an armature? How does a dynamo
work? Explain working in brief. [2]
21. Why do the magnetic lines of field do not cross each other’s
path? Draw the magnetic field lines due to a currenthrough circular loop. [2]22. Draw a sketch of domestic electric wiring what is a fuse?[2]
SECTION B23. Differentiate between an endocrine and an exocrine gland
Which gland of our body acts like both? Name its secretions and their role in our body. [2]
- (a)What is speciation?
(b)How are evolution and classification related?
(c)Why are all the acquired characters not heritable?(d)How do fossils help us in studying evolution?
(e)What are analogous and homologous organs? [5] Why was the Chipko movement started? How did it help the society? Give some of the benefits. [2]
Define with application:
a) The Fossil fuelb) Bio mass
c) O.T.E.d) Nuclear energy. [5]
Draw the structure of human heart. Define double circulation [3]- Name a growth stimulating and a growth inhibiting hormone in plants. [2]
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