SECTION - A
1. Why solar cookers are covered with glass plate and painted black from inside and outside.
2. Define electric potential at a point. A current of 2A passes through circuit for 1 minute. If the potential difference between 2 terminals is 3V. Calculate work done in transferring charge between two terminals.
3. Give reasons:-
a) If wire is stretched to double its length then its resistance becomes 4 times but resistivity remains same.
b) Cord of heater does not glow while heating element does.
c) Voltmeter is always connected parallel across the two terminals.
4. a) If magnetic field lines are crossed at a point. What does it indicate?
b) Draw magnetic field lines of a circular coil carrying current. On what factors does the strength of field depends.
5. Differentiate (two points each) :-
a) Overloading and short circuiting.
b) Earth wire and Fuse wire.
c) A.C & D.C.
6. Name three forms in which energy from oceans be used. Explain briefly working of OTEC plant. Mention one of its advantage and disadvantage.
7. Department of rural development of state government announced a scheme of 50% subsidy for installation of bio gas plant by farmers in their village but still many farmers criticize it. Being a science student, how will you convince them this plant is for their benefit? Explain in detail.
8. Derive an expression for equivalent resistance of three resistors connected in parallel.Draw a schematic diagram of circuit consisting of a battery of three cells of 2 V each 2Ω,4Ω & 6Ω resistors to have a current of 2 A from circuit.
9. What do you mean by EMI. Write an activity to demonstrate phenomena of EMI.
State the rule used to find direction of induced current. What are the factors on which strength of induced current depends?
SECTION - B
11. Explain the term Rancidity.
12. a) What is Redox Reaction? Write down a chemical equation representing it.
b) Write balanced chemical equation for the following reactions
(i) Barium Chloride + Potassium Sulphate → Barium Sulphate + Potassium Chloride.
(ii) Zinc + Silver Nitrate → Zinc Nitrate + Silver
13. a) Consider the following displacement reactions :
Fe + CuSO4 → FeSO4 +Cu
Zn + FeSO4 → ZnSO4 + Fe
Arrange the metals involved in increasing order of their reactivity.
b) Solid Lead Nitrate on heating gives solid Lead Oxide, Nitrogen di oxide and Oxygen gas.
i) Write balanced Chemical equation.
ii) Mark the state symbols.
iii) Identify the type of chemical reaction.
14. a) What is common name of the compound CaOCl2?
b) What is baking powder?
c) Name the process to prepare sodium hydroxide.
d) Write the chemical formula of sodium compound used to remove the permanent hardness of water.
15. a) At what pH in the mouth is tooth decay faster and why?
b) Write an equation to show the reaction between Plaster of Paris and water.
c) Name the acid present in (i) Orange (ii) Ant sting.
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