Friday, July 20, 2012
X SAI TRIANGLE TEST 1
M.M. 30 TIME: 75 MIN
1.
[3] In the adjoining
figure, P is a point on the side BC of AABC such that MP ║ AB and NP ║ AC. If MN and CB produced
meet in Q, prove that PQ2 =
QB x QC.
[3] In the adjoining
figure, P is a point on the side BC of AABC such that MP ║ AB and NP ║ AC. If MN and CB produced
meet in Q, prove that PQ2 =
QB x QC.
2.
[3] Using Basic Proportionality theorem prove that the line drawn through the
mid-point of one side of a triangle parallel to another side bisects the third
side.
3.
[2] In the adjoining figure, DE ║ AQ and DF ║ AR. Prove
that EF ║ QR
.
4.
[3] ABCD is a
trapezium in which AB ║ DC and its diagonals intersect each other at O. Using
Basic Proportionality theorem, prove that 
.
[3] ABCD is a
trapezium in which AB ║ DC and its diagonals intersect each other at O. Using
Basic Proportionality theorem, prove that .
.
5.
[2] Let ∆ABC ~ ∆DEF and their areas be 64 cm2
and 121 cm2 respectively. If EF = 13.2 cm , find BC.
6.
[3] Prove that the ratio of the areas of two
similar triangles is equal to the square of the ratio of their corresponding
medians.
7.
[3] Prove that in a triangle, if square
of one side is equal to the sum of the squares of the other two sides, then the
angle opposite the first side is a right angle.
8.
[3] In the adjoining
figure, 
ABD = CDB = PQB = 90°. If AB = x units, CD = y units and PQ = z units,
prove
[3] In the adjoining
figure, ABD = CDB = PQB = 90°. If AB = x units, CD = y units and PQ = z units,
prove
9.
[4] In an equilateral triangle ABC, a point D is
taken on base BC such that BD : DC = 2 : 1. Prove that 9 AD2 = 7AB2.
10. 
[4] In Figure given
alongside, ABC is a triangle in which ∠ ABC < 90° and AD 
BC. Prove that AC2 = AB2 + BC2 – 2 BC . BD.
[4] In Figure given
alongside, ABC is a triangle in which ∠ ABC < 90° and AD BC. Prove that AC2 = AB2 + BC2 – 2 BC . BD.
OPTIONAL / HOME WORK
11. In the adjoining figure, M is the
mid-point of the side CD of parallelogram ABCD. The line BM is drawn
intersecting AC in L and AD produced in E. Prove that EL = 2 BL.
12. Two isosceles triangles have equal
vertical angles and their areas are in the ratio 16 : 25. Find the ratio of
their corresponding>heights.
13. Prove that the ratio of the areas of two
similar triangles is equal to the square of the ratio of their corresponding
altitudes.
Saturday, July 14, 2012
X SA I CHEM TEST FULL SYLLABUS 5
1.
What
chemical process is used
for obtaining a metal from its oxide
?
2.
Complete and Balance
the reaction
Fe2O3
+ Al →
3.
What
do you see when
penta-hydrated copper sulphate
crystals are heated.
Give reaction too.
4.
(a)
Fe + CuSO4 → FeSO4 + Cu
(b) Cu + FeSO4 →
CuSO4 + Fe
Which of the above
two reactions will take place
and why ?
5.
Why is sodium kept immersed in kerosene oil ?
6.
Name
two salts that
are used in black
and white photography.
Give reactions when they
are exposed to light.
7.
You have
been provided with three
test tubes. One of
them contains distilled water and the other
two contain an acidic solution and
a basic solution respectively. If
you are given only red
litmus paper, how will you
identify the contents of each test tube
?
8.
(a)
What do you see when a magnesium
ribbon is burnt ? Is magnesium oxidized
or reduced in this reaction.
(b) Define
corrosion.
9.
(a)
All ores are minerals but all
minerals are not ores. Justify the
statement.
(b) What
is Galvanisation ?
(c) Give composition of brass and
bronze
(d) Explain
roasting with help of a reaction.
(e) What
do you mean by amalgam ?
OR
With reference to electrorefining of impure
copper, answer the following :
(a) Draw
a neat and labelled diagram requised for the purpose of
electrorefining.
(b) What
is electrolyte used ?
(c) Name
the cathode and anode used ?
(d) What
happens at cathode and Anode ?
X SA I CHEM TEST FULL SYLLABUS 4
1.
Name a Non-metal which is lustrous and a metal
which is Non—lustrous.
2.
Balance the following
chemical equations :
Pb(NO3)2
(s) H e at
PbO(s) + NO2 (g) + O2 (g)
3.
With
the help of a suitable example,
explain 0xidation and Reduction in terms of gain or loss of oxygen.
4.
Respiration
is considered as exothermic reaction.
Explain why ?
5.
Name the
chemicals used in the Acid
Fire extinguisher and the gas
evolved from it when used ?
6.
Explain why
Calcium metal after reacting with
water starts floating
on its surface ? Write
the chemical equation for the reaction.
7.
What are exothermic and endothermic reaction. Explain
with the help of one example each.
8.
A
sanitary worker uses a white
chemical having strong smell of chlorine
gas to disinfect the water tank.
(a)
Identify the chemical compound. (b) Write
the chemical formula.
(c) Write
chemical equation for preparing
it.
9.
How
baking soda is manufactured ? Write
chemical equations. Write
two important uses of it.
10.
(a)
How copper is obtained from its ore ?
Write equations.
(b) How
impure copper is refined by electrolytic refining ? Draw
diagram and write reactions at
cathode and anode.
OR
Write balanced chemical equation for the reactions taking place
when
(i) Zinc
carbonate is calcinated.
(ii) Zinc sulphide is roasted.
(iii) Zinc oxide
is reduced to Zinc.
(iv) Cinnabar is heated in the air.
(v) Magnese dioxide is heated with Aluminium Powder.
X SA I PHY TEST FULL SYLLABUS 3
1.
Define Ohm’s
Law.
2.
What is green
house effect ?
3.
A
wire is cut into three equal
parts and then
connected in parallel. How will
its :
(a) resistance (b) resistivity get effected
?
4.
Calculate
the resistance of a conductor when the
current flowing through it is 0.2
A and the potential difference is 0.8 V
?
5.
How does
the strength of the Magnetic field at the
centre of a circular coil of a wire depend on
(a) radius of the coil (b) number of turns of wire
in the coil
6.
What are exothermic and endothermic reaction. Explain
with the help of one example each.
7.
What are the disadvantage of using fossil fuels ?
8.
How many
resistors of 8W
are connected in parallel to carry 10 A current on 220V line ?
9.
State
Fleming’s Right hand rule.
Give one application of this rule.
What is SI unit of induced
current ?
10.
Explain the following :
(a) Why is Tungsten used for the filament in electric bulbs
?
(b) Why
are the conductors of electric
heating devices, made of an Alloy ?
(c) How
does the resistance of a
wire vary with
its cross sectional area.
11.
Draw a labelled diagram of a biogas plant.
12.
(a) Draw
a shcematic diagram of the common
domestic ciruit.
(b) Write
difference between overloading and
short circuiting.
OR
Answer the
following questions :
(i) What
is the direction of magnetic field lines outside a bar-magnet ?
(ii) What
is SI unit of magnetic field ?
(iii) What
does crowding of magnetic field
lines indicate ?
(iv) What
is the frequency of A.C. in India
?
(v) Name
two organs in the human body where magnetic field is quite significant.
X SA I BIO TEST FULL SYLLABUS 3
1.
How is the process of transpiration useful to plant
?
2.
Tendril encircles
or coils around the object in contact
with it. Elaborate.
3.
Name the hormone secreted by ovary, testes
and adrenal glands. Write
a function of each hormone.
4.
Draw a labelled diagram of a biogas plant.
5.
Draw a neat
diagram of Respiratory System in
Humans and label the following :
(i)
Trachea (ii) Bronchi (iii) Lungs (iv) Larynx
Where does
exchange of gases take place
?
OR
Draw neat diagram of digestive system. Label its
all parts. How the main components of the food digested in the small intestine?
Explain.
X SA I CHEM TEST FULL SYLLABUS 3
1.
Write electronic configuration of an element having
atomic number 13.
2.
State an example of an endothermic reaction.
3.
Why do we store silver chloride in dark
coloured bottles? Explain in brief.
4.
“A
solution of potassium chloride when mixed
with silver nitrate solution, an insoluble white substance is formed”.
a.
Translate
the above statement into a chemical
equation.
b.
State
two types for this reaction.
5.
Write the chemical
name and formula of common salt. State how
sodium hydroxide is prepared using
this salt.
6.
Draw
a labelled schematic diagram to show the electrolysis of water. Why is the amount of gas collected in one of the test tubes in this activity double of the amount collected in the other
?
7.
Five
solutions A, B, C, D and E when tested
with universal indicator showed pH as 4, 1, 11, 7 and 9 respectively. Which
solution is (a) neutral (b)
strongly alkaline (c) strongly acidic
(d) weakly acidic and (e) weakly alkaline. Arrange the pH in
increasing order of H—ion concentration.
8.
What
happens when chlorine is passed over
dry slaked time? Write chemical
equation of the reaction involved.
Mention three properties of the
product.
9.
How is charcoal different from coal
How is it prepared? State two
criteria for considering charcoal
a letter fuel than wood for domestic purposes.
10.
State the
reason why
(i) carbon
is not used to reduce the
oxides of sodium or aluminium.
(ii) an iron strip dipped in a blue copper sulphate solution
turns the blue solution pale green.
(iii) metals
replace hydrogen from acids
whereas non-metals do not.
(iv) calcium
does not occur
free in nature.
(v) zinc is used in the galvanisation of iron and
not the copper.
OR
(a)
list
two differences between calcinator
and roasting.
(b) An element ‘X burns in oxygen to form
an electrovalent compond XO.
State the compounds you
expect will form
if the element X is made to combine with (i) chlorine and (ii) sulphur. Mention the Chemical formula and nature of bond present in each case.
X SA I CHEM TEST FULL SYLLABUS 2
1.
A
non-metal X exists in two different forms Y and Z. Y is the hardest natural substance, whereas Z is a good conductor of electricity. Identify X, Y and Z.
2.
A
solution of potassium chloride when
mixed with silver
nitrate solution, an insoluble white
substance is formed. Write the chemical
reaction involved and also
mention the type of the chemical reaction ?
3.
A
substance X, which is an oxide of a metal
is used intensively in the cement industry. This element is present in bones also.
On treatment with water
it forms a solution which turns
red litmus blue. Identify X and also write
the chemical reactions involved.
4.
What is Plaster
of Paris ? How it is obtained from Gypsum. Write
chemical reaction. Give its one
use.
5.
A
metal A, which is used
in thermite process, when heated with
oxygen gives an oxide B, which is amphoteric in nature. Identify A and B. Write down the reactions of oxide B with
HCl and NaOH.
6.
Why
do we store silver chloride in dark coloured bottles ?
7.
A
magnesium ribbon is burnt in oxygen to give a white compound X accompanied by emission of light.
(a)
Write the chemical
formulae of X
(b)
Write a balanced chemical equation, when X is dissolved in water.
8.
Salt
A commonly used in bakery products on heating gets converted into
another salt B which itself is used for removal of hardness of water and a gas C is evolved. The gas C when passed
through lime water, turns it milky. Identify A,B and C.
Write balanced chemical equations
for each step.
9.
Fill
in the missing data in the following
table
10.
(i) Given below are the steps for extraction of
copper from its ore. Write the
reaction involved.
(a)
Roasting
of copper (1) sulphide
(b)
Reduction
of copper (1) oxide with copper (1) sulphide.
(c)
Electrolytic
refining
(ii)
Draw a neat and
well labelled diagram for
electrolytic refining of copper
OR
(a)
Explain the formation of Magnesium Chloride by the
transfer of electrons.
(b)
Explain three
properties of ionic compounds.
X SA I CHEM TEST FULL SYLLABUS 1
1.
Name one metal
which react with
very dilute HNO3 to evolve
Hydrogen gas.
2.
What is the brown coloured gas evolved when lead
nitrate crystals are heated in a dry test tube ?
3.
Name the acid present in
(1)
ant sting (2)
tamarind.
4.
Write balanced equations for the reaction of :
(a)
Iron with steam
(b)
Calcium with water.
5.
On
mixing solutions of lead nitrate and potassium iodide in a test tube.
(a)
Write the chemical equation involved in the balanced form.
(b)
What is the colour of the precipitate ? Name
the precipitate.
6.
How pure copper is obtained from impure copper by electrolytic refining ?
7.
Write the
balanced equation involved, when
(a)
Chlorine is passed over dry
slaked lime.
(b) Sodium bicarbonate reacts with
dilute hydrochloric acid
(c) Sodium bicarbonate is heated.
8.
(a)
What is universal indicator?
(b) Write the
chemical equation involved in
the preparation of sodium hydroxide. Name the process.
9.
(a) Write
one equation each for
decomposition reaction when energy is supplied in the form of :
(i) heat (ii) light
(b)
Account for the following.
(i)
Paint is applied on iron articles.
(ii)
Oil and fat containing food items
are flushed with nitrogen.
(iii)
When an iron
nail kept in
copper sulphate solution, blue
colour of the solution fades and
iron nail becomes brownish.
OR
(a)
What do you mean
by
(i)
precipitation reaction (ii)
exothermic reaction (iii)
oxidation reaction
Write
balanced chemical equation.
(b)
When a water insoluble substance
‘X’ is added to dilute hydrochloric
acid a colourless, odourless gas is
evolved. When the gas passed through lime water, it turns milky. Write the chemical formula of X and the
chemical equations involved.
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