Winter Break Holiday Homework 2012-13
Class - XI
Subject: - Maths
1. Find the equation of circle which touches the both axis in first quadrant and whose radius is a.
2. Find the equation of circle having (11 − 2) as its centre and passing through the intersection of
lines 3𝑥 + 𝑦 = 14, 2𝑥 + 2𝑦 = 18 .
3. Find the equation of each of the following parabolas(a) Directrix x=0, focus at (6,0)
(b) Vertex at (0,4), focus at (0,2)
(c) Focus at (-1,-2), Directrix x-2y+3=0 .
4. An equilateral triangle is inscribed in a parabola 𝑦 2 = 4𝑎𝑥 , whose one vertex is at the vertex
of the parabola. Find the length of the side of the triangle.
√2
5. Find the equation of the ellipse which passes through the point (-3,1) and has eccentricity ,
5
with x-axis as its major axis and centre at the origin.
6. Given the ellipse with equation 9𝑥 2 + 25𝑦 2 = 225 , find the eccentricity and foci.
7. Find the length of transverse and conjugate axis , Co-ordinates of foci, vertices and
eccentricity of the hyperbola 9𝑥 2 − 16𝑦 2 = 144.
8. Find the equation of path of the point P, which moves such that 𝑃𝐴2 + 𝑃𝐵 2 = 2𝐾 2 where A and
B are the prints (3,4,5,) and (-1,3,-7)
9. Find the ratio in which the line segment joining the points (2,4,5) and (3,5,-4) is divided by xzplane.
10. Describe the vertices and edges of the rectangular parallelepiped with vertex (3,5,6) placed
in the first octant with the vertex and edges of parallelepiped is along X, y and z axis
Subject: - Chemistry
1.Why are halides of beryllium polymeric?
2.Desrive the importance of (i) Lime stone (ii) cement (iii) plaster of paris.
3.Descrive two similarities and differences between B and Al.
4.Suggest a reason as to why CO is poisonous.
5.Explain the formation of (i) Water gas (ii) Producer Gas . Give their uses. What happens when CO2 is passed through
lime water (i) for short duration (ii) For long duration .
6.Give reasons for the following observations :
(i) KO2 is paramagnetic in nature.
(ii) A solution of Na2CO3 is alkaline.
(iii) LiI is more soluble than KI in ethanol.
(iv) BaO is soluble but BaSO4 is insoluble in water.
(v) BeO is almost insoluble but BeSO4 is soluble in water.
(vi)Li does not form alum like other alkali metals.
(vii) Among all the alkali metals Lithium is the strongest and Sodium is the weakest reducing agent.
(viii)Boric acid considered as weak monobasic acid.
(ix) Graphite is used as lubricant .
(x) Diamond is used as an abrasive.
7.What are silicones ? Give two uses of silicones.
8.Write balance chemical equations for:
(i) B2H6 + NH3→
(ii)Al + NaOH →
(iii)Ai + HCi →
(iv) SiO2 + HF →
(v) Na2O2 + H2O →
(vi) AlN + H2O →
(vii) B2O3 + H2O →
(viii) Al4C3 + H2O →
(ix) Mg + Liq. NH3 →
(x) CaO + SiO2 →
9. Arrange the following in the property mentioned :
(i) Li+ , Na+ , K+, Rb+, Cs+ (increasing order of mobility in water)
(ii) Be+ +,Mg+ +, Ca+ +, Sr+ +,Ba++(increasing order of hydration enthalpy)
(iii)B2O3,In2O3, Ga2O3 ,Al2O3 (increasing order of basic nature)
(iv)Ge ,Sn ,Pb (increasing order oxidizing power of tetravalent species)
(v)PbF2, PbCl2 ,PbBr2, PbI2(increasing order ionic character)
(vi)InCl3, BCl3, GaCl3, AlCl3 (increasing order of acidic nature)
10.Compare the solubility and thermal stability of the following compounds of alkaline earth metals with those of the
alkaline earth metals.(i) Nitrates (ii) Carbonates (iii) Sulphates.
11.Explain structures of boric acid , diborane and Al2Cl6.
12.Potassium carbonate can not be prepared by Solvay process. Why?
Subject: - Biology
1. Project – prepare a power point presentation on any physiological process of man.
2. Practice paperA. Draw the following(i)
Give schematic representation of glycolysis.
(ii)
Schematic representation of Kreb’s cycle.
(iii)
Anatomical regions of human stomach.
(iv)
Duct system of liver, gall bladder and pancreas.
(v)
Exchange of gases at the alveolous and body tissues
B. Answer the following questions(i)
Define vital capacity, tidal volume.
(ii)
Give the causes and symptoms of following diseases
a. Emphysema
b. Angina
c. Constipation
(iii)
Explain digestion of protein in gut
(iv)
How CO2 is transported in blood?
(v)
Draw a flow chart showing coagulation of blood.
(vi)
What is vernalisation? What is its importance?
(vii) Give physiological effects of auxine, ethylene, ABA.
(viii) What is plasticity?
(ix)
Give the importance of bile juice and HCl in digestion.
(x)
What is ECG?
Subject: - Physics
1. Why two holes are made to empty an oil tin?
2. Why mercury is used in barometer?
3. A barometer is accelerating downwards reads 76cm o Hg. What will be the possible air
pressure inside the jar?
4. Why two boats moving in parallel directions close to each other gets attracted?
5. A big sized balloon of mass M is held stationery in air with the help of a small block of mass
M/2 tied to it by a light string such that both float in mid air. Describe the motion of the balloon
and the block when the string is cut. Support your answer with calculations.
6. A spherical solid ball of volume V is made of a material of density ρ 1. It is falling through a
liquid of density ρ2 (ρ2 > ρ1). Assume that the liquid applies a viscous force on the ball that is
proportional to the square of the speed v i.e., Fv = -kv2 (v>0).
7. A balloon filled with helium does not rise in air indefinitely but halts after certain height. Explain
why?
8. Describe the various factors which affect the surface tension of the liquid.
9. If a number of little droplets of water, each of radius r coalesce to form a single drop of radius
R. Show that the rise in temperature will be given by ∆𝜃 =
3𝜎 1
𝐽
1
[𝑟 − 𝑅] where 𝜎 is the surface
tension of water and J is is the mechanical equivalent of heat.
10. A liquid drop of diameter D breaks up into 27 tiny drops. Find the resulting change in energy.
Take surface tension of the liquid as.
Subject: - English Class A & D
Based on your personal response to the following, develop e in the form of a narrative or a story of
about 100-150 words.
i)
“work is worship. Hard work is the key to the success. You cannot achieve anything without
efforts.”said the old dying farmer to his four lazy sons.
ii)
Meenakshi a student of class xi feels highly disturbed when she reads about the hike in the
price of essential commodities like gas.pulse, vegetables etc. write an article on’ Price- hike
of essentials Commodities’ for publication in a local daily, suggesting certain steps to curb
this menace.
iii)
You are Shishir/Swati. Write a speech to be delivered at the morning assembly in your
school about the increase in violence and social unrest in your area. Interpreting the data if
possible. (about 200 words)
iv)
You are AKHIL/Asmita of 119, Mall Road, Shimla. You are interested in doing a short term
course in Computer Programming during Winter Break. Write a letter to the Director of
Computer World,Sector-22, Chandigarh enquiring about the duration of such a course and
the terms and conditions for admission.
( duration of course- mode of payment/lumpsum
– whether diploma/certificate –timing of classes/ recognition and its validity etc.
v)
You are Atul Wason, a resident of L-23,Virat Nagar New Delhi. Write a letter to the
librarian, requesting him to issue a duplicate identity card.
vi)
You are Rajat/Rajani head boy/girl of your school, request your principal in writing to
arrange extra classes in Maths & Chemistry for the students of XI class. Give details
response to support your demand.
vii)
Make five notes in an appropriate format.(note-making)
viii)
Read the English newspaper daily during the break , cut and paste the five Editorial report
of current problems.
English-Class XI B AND XI C
Winter Break Holiday Homework
1. Revise Mother’s Day and Birth and complete all assignment questions given.(HW COPY)
2. Read The Canterville Ghost with special attention to Unit V VI and VII.
3. Put down value points for the following questions with reference to The Canterville Ghost:
a) Plot Outline
b) Theme/s
c) Characters
d) Author’s style
e) Important incidents of Unit V VI and VII
4. Draft articles on the following topics: ( to be done on assignment sheets)
a) Role of Youth In Combatting Corruption
b) Economic compulsions and the changing social trends of modern India force both parents to be
employed. This has an adverse and detrimental effect on the upbringing and the all-round
development of their children. Write an article and give it a suitable title.
c) Crime against Women
5. Prepare your group wise presentations for the novels that you have read during the vacation. You will be
marked out of 10 for the Project on the basis of your presentation, contribution and performance. Group
leaders may assign roles to the participants.
Subject: - HINDI