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Section A
1.Identify one of the uses of solar heater in the following:
a. conversion of solar energy into electrical energy.
b.Providing energy for artificial satellites.
c.Desalination of marine water.
d.Using in automatic streetlights.
2. Si+C=SiC. This chemical reaction is an example of:
a. an exothermic reaction.
b. an endothermic reaction.
c. a dissociation reaction.
d. a displacement reaction.
3. A domestic electrical appliance requires alternating current of 15V. If 220V of alternating current is supplied to the house, then the device that helps in the functioning of that electrical appliance is:
a. an induction coil.
b. a step-up transformer.
c. an AC dynamo.
d. a step-down transformer.
4. Identify the correct complementary base pairing among the following:
a. Adenine-Thymine and Guanine-Cytosine
b. Adenine-Guanine and Thymine-Cytosine
c. Adenine-Cytosine and Thymine-Guanine
d. Guanine-Adenine and Cytosine-Adenine
5. In Fleming's right-hand rule middle finger indicates the direction of:
a. magnetic field.
b. induced electric current.
c. mechanical energy.
d. motion of the conductor.
Section B
(4*1=4)
The structural formulae of hydrocarbons are given in Column-A and their uses are given in Column B. Match them & write the answer along with its letters.
Section C
Total marks (16*2=32)
Draw the diagram of blast furnace used in the extraction of iron.
What is annealing of glass? Name the colour obtained when (i) Ferric compounds, (ii) Cobalt compounds are added to the mixture of molten glass
or
What is pulping? How is an uncoated paper converted into coated paper?
Differentiate between Caucasoid man and Mongoloid man based on their physical features.
State the modern periodic table.
Draw the diagram of a DC dynamo & label the following parts.
a. split rings b.armature coil
Section D
Total marks(3*4=12)
Draw the diagram showing the internal structure of human ear and label the following parts:
a. organ of corti
b. auditory nerve
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