Column I
|
Column II
|
1.
Sodium
2.
Cerium
3.
Sulphur
4.
Manganese
|
a.
Lanthanide
b.
Metalloid
c.
Transition metal
d.
Noble metal
e.
Metal
f.
Non – metal.
|
Advertisement
Science Preliminary Paper
Q1. (A) Solve the following: 7 Marks
1.
The element eka – aluminum in
Mendeleev’s periodic table is known as ______ in modern periodic table.
2.
Phenolphthalein is _________ type of
indicator.
3.
1 kilowatt hr = ____________ Joules.
a.
4.6 x 106 Joule
b. 3.6 x 106 Joule
c.
30.6 x 106 Joule
d.
3.6 x 105 Joule
Q1. B. Match the
columns.
Q2. Answer the following sub questions: 6 marks
1. The material used for fuse has low melting point.
2. Fleming’s
right hand rule
3. What is ray diagram? What are the rules used for
drawing ray diagrams for the formation of image by spherical mirror?
Q3. Answer Any Four of the following questions: 12 marks
1. What are the demerits of Mendeleev’s periodic table?
2. Write short notes on Indicators (with proper
example).
3.
State
application (uses) of baking soda.
4. State the characteristics of magnetic lines of
force.
5.
Applications of spherical mirrors and
lenses:
Q4. Answer any one of the following questions: 5 marks
1. Explain how the formation of rainbow occurs.
2. Find the expression for the resistors connected in
series and parallel.
Q5. (A) Fill in the blanks: 3 marks
1.
The direction
of the magnetic field around a straight conductor carrying current is given by
____________
a.
Right hand
thumb rule b. Fleming’s
left hand rule
b.
c. Fleming’s right hand rule d.
None of these.
2. An
optical device used by watch repairers is _____________.
3. The
organic compounds having double or triple bond in them are termed as ___________
Q5. (B) Answer in one sentence 4 marks
1.
Metal which
forms an amphoteric oxide?
2.
An alloy of
copper and zinc.
3.
A compound
which is added to lower the fusion temperature of an electrolytic bath in
extraction of aluminium.
4.
A common ore
of aluminium.
Q6 . (A) Give scientific reasons: 4 marks
1.
Gold and
silver are used to make jewellery.
2. The
plants are kept in dark before determining the factors essential for
photosynthesis.
Q6. (B) Distinguish between : 2 marks
Voluntary and Involuntary movements
Q7. Answer any four of the following questions: 12
marks
1. Write a short note on
Reflex action
2. Describe sexual
reproduction in plants.
3.
With the help
of a diagram (Punnett square) show a Mendelian experiment where tall pea plant
bearing red flowers is crossed with a short pea plant bearing white flowers.
Write both the phenotypic and genotypic ration for F2 generation.
4. State and explain how
alkanes are further classified.
5.
Explain the structure and function of a nephron.
Q8. Answer in detail (Any one) 5 marks
1. In the extraction of aluminium write the following.
i.
Name the
process of concentration of Bauxite.
ii.
Write the
cathode reaction in electrolytic reduction of alumina.
iii.
Write the
function and formula of cryolite in the extraction of aluminium.
iv.
Write an
equation for the action of heat on aluminium hydroxide.
v.
Draw the
diagram of extraction of aluminium.
vi.
Why is it
necessary to replace anodes time to time?
vii.
What happens
when aluminium ore is heated with concentrated caustic soda. Write the balanced
chemical equation for the same.
2. Explain the formation of an ionic compound between metal and a non –
metal by transfer of electrons with Mg as the metal and Cl as a non – metal to
illustrate your answer.
=============All
the best==============