View
7
Download
0
Category
Preview:
Citation preview
14
TITIKSHA PUBLIC SCHOOL
SESSION 2018-19
SUMMER BREAK HOMEWORK
CLASS XII
ENGLISH
INSTRUCTIONS:
• Write the answers carefully in a legible handwriting which should be clear enough to read
• The work should be completed in Homework Notebooks
• All the answers should be marked with date
Letter Writing
1. During summer vacation, everyone looks for a long gateway, away from the scorching
high temperatures and hustle-bustle of the city life. Write down a letter to your friend for
place, evoking interest to visit in summer in India .You are Mohit / Mohita.
2. You are Prakash / Prakshi. You saw an advertisement regarding a course for training and
preparing students for TOEFL-Test of English as a Foreign Language. You wish to join the
course. Write a letter to the Course Director of ‘EASY ENGLISH, MGR Marg, Chennai,
inquiring about all the details that you require.
3. You are Daisy/Danish, a student of Class XII of St John’s School, Delhi Cantt, New Delhi.
You have come across textbooks supposedly published by NCERT but without their logo,
at revised prices indicated by rubber stamp or a sticker. Write a letter to Chairman
NCERT, New Delhi, complaining about the pirated editions and the manipulated prices.
4. You are Mohit Chaudhary of Western House, Green Lane, Mumbai. You have seen an
advertisement in the newspaper looking for salesboys to work at the local Mcdonald outlet.
You are interested and decided to apply. Write the letter applying for job giving your
personal details.
Article Writing
1. The Existence of the Generation Gap is a Reality
2. Ban Religion, Save the Country
3. Community Service in Schools
4. How to Curb Bullying in Schools ?
5. Growing Urbanization is a doom for Nature
Speech/Debate Writing
1. Rights and Responsibilities of a Citizen
2. How the Youth can Curb Corruption in India
3. Pen is Mightier than a Sword
4. Importance of Secular Nature of our Country
5. Negative effects of Mall Culture on the Youth
Literature
1. Write down the character sketch of the following with reference from the novel ‘The
Invisible Man’(120-150 words)
• Griffin
• Mrs Hall
• Mr Teddy Henfrey
• Mr Cuss
14
• Mr Bunting
• Mr Jaffers
• Mr Marvel
• The Hunchback
• Dr Kemp
• Colonel Adey
• Mr Heelas
2. Why did HG Wells put an epilogue in the novel ‘The Invisible Man’?
3. What message does the story ‘The Last Lesson’ carry? How relevant is it today?(120-150
words)
14
PHYSICS
Ray Optics and Optical Instruments
Section A (1 mark
each) Question 1. Write the value of angle of reflection for a ray of light falling normally on a
mirror.
Question 2. How does the dispersive power of glass prism change when it is dipped in water?
Question 3. Light falls from glass to air. Find the angle of incidence for which the angle of
deviation is 90°.
Question 4. Name the phenomenon due to which one cannot see through fog.
Question 5. What is the ratio of sini and sinr in terms of velocities in the given figure. Question 6. What is the shape of fringes in young’s double slit experiment?
Question 7. A equiconcave lens of focal length 15 cm is cut into two equal halves along
dotted line as shown in figure. What will be new focal length of each
half
Question 8. For the same angle of the incidence the angle of refraction in three media A, B and
C are 15°, 25° and 35° respectively. In which medium would the velocity of light be minimum?
Question 9. What is the phase difference between two points on a cylindrical wave front?
Question 10. What is the ‘power’ of plane glass plate?
14
Question 11. Show with the help of diagram, why a beam of white light passing through a
hollow prism does not give spectrum.
Question 12. How does focal length of lens change when red light incident on it is replaced
by violet light?
Question 13. A myopic person prefers to remove his spectacles while reading a book.
Why? Question 14. Lower half of the concave mirror is painted black. What effect will this have on
the image of an object placed in front of the mirror?
Question 15. An air bubble is formed inside water. Does it act as converging lens or a
diverging lens? [Diverging lens]
Question 16. A water tank is 4 meter deep. A candle flame is kept 6 meter above the level. µ
for water is 4/3. Where will the image of the candle be formed? [6m
below the water level].
Section B (2 marks each)
Question 1. A near sighted person can clearly see objects up to a distance of 1.5m. Calculate
power of the lens necessary for the remedy of this defect. (P = – 0.67D) Question 2. A person can adjust the power of his eye lens between 50D and 60D. His far point
is infinity. Find the distance between retina and eye lens.
Question 3. Calculate the value of θ, for which light incident normally on face AB grazes along
the face BC.
Question 4. Name any two characteristics of light which do not change on polarisation.
14
Question 5. Complete the path of light with correct value of angle of emergence.
Question 6. Define diffraction. What should be the order of the size of the aperture to observe
diffraction.
Question 7. Show that maximum intensity in interference pattern is four times the intensity due to
each slit if amplitude of light emerging from slits is same.
Question 8. Two poles-one 4m high and the other is 4.5 m high are situated at distance 40m
and 50m respectively from an eye. Which pole will appear taller? Question 9. S1 and S2 are two sources of light separated by a distance d. A detector can move along S2P perpendicular to S1S2. What should be the minimum and maximum path difference at the detector?
Question 10. If a jogger runs with constant speed towards a vehicle, how fast does the image of
the jogger appear to move in the rear view mirror when
(i) the vehicle is stationery (ii) the vehicle is moving with constant speed.
Question 11. A person looking at a mesh of crossed wire is able to see the vertical wire more
distinctly than the horizontal wire. Which defect he is suffering from? How
can this defect be corrected?
Question 12. Is optical density same as mass density? Give an example.
14
Question 13. When does (i) a plane mirror and (ii) a convex mirror produce real image of
objects.
Question 14. A virtual image cannot be caught on a screen. Then how do we see it?
Question 15. Draw a diagram to show the advance sunrise and delayed sunset due to atmospheric refraction.
Question 16. Define critical angle for total internal reflection. Obtain an expression for
refractive index of the medium in terms of critical angle.
Question 17. The image of a small bulb fixed on the wall of a room is to be obtained on the
opposite wall ‘s’ m away by means of a large convex lens. What is the
maximum possible local length of the lens required?
Question 18. The angle subtended at the eye by an object is equal to the angle subtended at the
eye by the virtual image produced by a magnifying glass. In what sense then
does magnifying glass produce angular magnification?
Question 19. Obtain relation between focal length and radius of curvature of (i) concave
mirror (ii) convex mirror using proper ray diagram.
Question 20. Two independent light sources cannot act as coherent sources. Why? Question 21. How is a wave front different from a ray? Draw the geometrical shape of the
wavefronts when.
(i) light diverges from a point source,
(ii) light emerges out of convex lens when a point source is placed at its
focus.
Question 22. What two main changes in diffraction pattern of single slit will you observe
when the monochromatic source of light is replaced by a source of white
light.
Question 23. You are provided with four convex lenses of focal length 1cm, 3cm, 10cm and 100
cm. Which two would you prefer for a microscope and which two for a
telescope.
Question 24. Give reasons for the following
(i) Sun looks reddish at sunset
(ii) clouds are generally white
Question 25. Using Huygens Principle draw ray diagram for the following
(i) Refraction of a plane wave front incident on a rarer medium
14
(ii) Refraction of a plane wave front incident on a denser medium.
Question 26. Water (refractive index μ) is poured into a concave mirror of radius of curvature ‘R’
up to a height h as shown in figure. What should be the value of x so that the
image of object ‘O’ is formed on itself?
Question 27. A point source S is placed midway between two concave mirrors having equal focal
length f as shown in Figure. Find the value of d for which only one image is formed.
Question 28. A thin double convex lens of focal length f is broken into two equal halves at the
axis. The two halves are combined as shown in figure. What is the focal length of combination in
(ii) and (iii). Question 29. How much water should be filled in a container 21 cm in height, so
that it appears half filled when viewed from the top of the container. (aμω =
4/3)?
14
Question 30. A ray PQ incident on the refracting face BA is refracted in the prism BAC as shown
in figure and emerges from the other refracting face AC as RS such that AQ =
AR. If the angle, of prism A = 60° and μ of material of prism is √3 then find
angle θ. Section C (3 marks each)
Question 1. Using mirror formula show that virtual image produced by a convex mirror is
always smaller in size and is located between the focus and the pole.
Question 2. Obtain the formula for combined focal length of two thin lenses in contact,
taking one divergent and the other convergent.
Question 3. Derive snell’s law on the basis of Huygen’s wave theory.
Question 4. A microscope is focussed on a dot at the bottom of the beaker. Some oil is poured into
the beaker to a height of ‘b’ cm and it is found that microscope has to raise
through vertical distance of ‘a’ cm to bring the dot again into focus. Express
refractive index of oil is terms of a and b.
Question 5. Define total internal reflection. State its two conditions. With a ray diagram show how does optical fibres transmit light.
Question 6. A plane wave front is incident on (i) a prism (ii) A convex lens (iii) a concave mirror. Draw the emergent wavefront in each case.
Question 7. Explain with reason, how the resolving power of a compound microscope will
change when (i) frequency of the incident light on the objective lens is
increased. (ii) focal length of the objective lens is increased. (iii) Aperture of
objective lens is increased.
Question 8. Derive Mirror formula for a concave mirror forming real Image.
Question 9. Two narrow slits are illuminated by a single monochromatic sources.
(a) Draw the intensity pattern and name the phenomenon
(b) One of the slits is now completely covered. Draw the intensity pattern now
obtained and name the phenomenon.
Question 10. Explain briefly (i) sparkling of diamond (ii) use of optical fibre in communication.
Question 11. Using appropriate ray diagram obtain relation for refractive index of water in terms of
real and apparent depth.
14
Question 12. Complete the ray diagram in the following figure where, n1, is refractive index of medium
and n2 is refractive index of material of lens.
Question 13. A converging beam of light is intercepted by a slab of thickness t and refractive
index μ. By what distance will the convergence point be shifted? Illustrate the answer.
Question 14. In double slit experiment SS2 is greater than SS1 by 0.25λ. Calculate the path
difference between two interfering beam from S1 and S2 for minima and maxima on the point P
as shown in Figure.
14
Section D (5 marks each)
Question 1. With the help of ray diagram explain the phenomenon of total internal reflection. Obtain the
relation between critical angle and refractive indices of two media. Draw ray diagram
to show how right angled isosceles prism can be used to:
(i) Deviate the ray through 180°.
(ii) Deviate the ray through 90°.
(iii) Invert the ray.
Question 2. Draw a labelled ray diagram of a compound microscope and explain its working. Derive an
expression for its magnifying power.
Question 3. Diagrammatically show the phenomenon of refraction through a prism. Define angle of
deviation in this case. Hence for a small angle of incidence derive the relation δ = (μ –
1) A.
Question 4. Name any three optical defects of eye. Show by ray diagram :
(i) Myopic eye and corrected myopic eye.
(ii) Hypermetropic eye and corrected hypermetropic eye.
Question 5. Define diffraction. Deduce an expression for fringe width of the central maxima of the
diffraction pattern, produced by single slit illuminated with monochromatic light
source.
Question 6. What is polarisation? How can we detect polarised light? State Brewster’s Law and deduce
the expression for polarising angle.
Question 7. Derive lens maker formula for a thin converging lens.
Question 8. Derive lens formula
(a) a convex lens,
(b) a concave lens.
Question 9. Describe an astronomical telescope and derive an expression for its magnifying power using
a labelled ray diagram.
Question 10. Draw a graph to show the angle of deviation with the angle of incidence i for a
monochromatic ray of light passing through a prison of refracting angle A. Deduce
the relation
µ =
14
Question 11. State the condition under which the phenomenon of diffraction of light takes place Derive
an expression for the width of the central maximum due to diffraction of light at a
single slit. Also draw the intensity pattern with angular position.
NUMERICALS
Question 1. An object of length 2.5cm is placed at a distance of 1.5f from a concave mirror where f is
the focal length of the mirror. The length of object is perpendicular to principal axis.
Find the size of image. Is the image erect or inverted?
Question 2. Find the size of image formed in the situation shown in figure.
Question 3. A ray of light passes through an equilateral prism in such a manner that the angle of
incidence is equal to angle of emergence and each of these angles is equal to 3/4 of
angle of prism. Find angle of deviation. [Ans.: 300]
Question 4. Critical angle for a certain wavelength of light in glass is 30°. Calculate the polarising angle
and the angle of refraction in glass corresponding to this.
Question 5. A light ray passes from air into a liquid as shown in figure. Find refractive index of liquid.
14
Question 6. At what angle with the water surface does fish in figure see the setting sun?
Question 7. In the following diagram, find the focal length of lens L2. [40 cm] Question 8. A hypermetropic person whose near point is at 100 cm wants to read a book. Find the
nature and power of the lens needed. Question 9. For a man shortest distance of distinct vision is 20 cm. What will be the type and power
of lens which would enable him to read a book at a distance of 60 cm? Question 10. Using the data given below, state which two of the given lenses will be preferred to
construct a (i) telescope (ii) Microscope. Also indicate which is to be used as
objective and as eyepiece in each case.
14
Question 11. Two thin converging lens of focal lengths 15 cm and 30 cm respectively are held in
contact with each other. Calculate power and focal length of the combination.
Value Based Questions
Question 1. A child is observing a thin film such as a layer of oil on water show beautiful colours
when illuminated by while light. He feels happy and surprised to see this. His
teacher explains him the reason behind it. The child then gives an example of
spreading of kerosene oil on water to prevent malaria and dengue.
(i) What value was displayed by his teacher?
(ii) Name the phenomenon involved?
Question 2. Ravi is using yellow light in a single silt diffraction experiment with sit width of 0.6 mm.
The teacher has replaces yellow light by x-rays. Now he is not able to observe the
diffraction pattern. He feels sad. Again the teacher replaces x-rays by yellow light
and the differaction patter appears again.
(i) Which value is displayed by the teacher?
(ii) Give the necessary condition for the diffraction.
CHEMISTRY
Do all the questions from NCERT exampler for the following chapters:-
(i)solid state
(ii)solutions
(iii)chemical kinetics
(iv)surface chemistry
14
MATHEMATICS
Revise the following chapters from exemplar :
❖ Chapter 1: Relations and Functions
❖ Chapter 2: Inverse trigonometric functions
❖ Chapter 3: Matrices
❖ Chapter 4: Determinants
❖ Chapter 5: Continuity and differentiability
BIOLOGY
QUESTION BANK
Answer the following questions
1. Name the two kinds of linkage.
2. Write Mendel’s dihybrid ratio of phenotypes.
3. Who proposed chromosome theory of inheritance?
4. Who shows that the gene lie in the chromosome?
5. Which Mendel’s law of inheritance is universally acceptable without any
exception?
6. Write any three abnormalities linked with sex chromosomes.
7. List the main points of chromosome theory of inheritance.
8. What do you mean by Pedigree analysis?
9. Give a detailed account of following:
(a) Sickle Cell Anaemia
(b) Haemophilia
(c) Phenylketonuria
10. Define the terms intron and exon.
11. List the characteristics of a gene
12. What is central dogma reverse?
13. Differentiate between a template strand and coding strand of DNA
14. Write the full form of VNTR. How is VNTR different from probe?
15. Describe the structure of tRNA.
16. Genetic code is specific and nearly universal. Justify.
17. Give the applications of “finger printing”.
18. How does replication occur in DNA?
19. Mention two functions of codon AUG.
20. Explain the phenomenon of Industrial Melanism. What does it suggest?
21. Differentiate between Convergent and Divergent Evolution
22. What are homologous organs? How do they provide evidence of evolution?
23. What do you understand by “survival of the fittest”?
24. What is Adaptive radiation? Explain with example
25. What is Hardy Weinberg Equilibrium? Give its equation? Is it applicable under all
conditions in nature?
14
- Revise Chapter 5 to 7
- Reattempt periodic test in the notebook
- Complete your investigatory projects along with case study
COMPUTER SCIENCE
● Revise Ch- 1 to 6.
● Reattempt periodic test in the notebook with corrections.
● Attempt all questions of Section 1, 2 from Question Bank.
ENGINEERING GRAPHICS
Q1- Construct an isometric scale of 80mm length with sub-divisions.
Q2-Draw all prisms , pyramid & Frustums base side =50mm and axis length=70mm.
Q3-Draw top and front view of Hexagonal nut & Square nuts M=30mm.
Q4- Draw front &LHS views of Hexagonal headed bolt and Square bolt ( i e. Shank
length=120mm, thread length=80mm and M=30mm).
Q5- Assembly :- draw all views according to book, give all dimension and projection symbol.
1)OPEN BEARING
2)BUSH BEARING
3)SPIGOT &SOKET JOINT.
14
ACCOUNTANCY
PART B: Financial Statement Analysis
Q.1 Prepare Specific Project 1.
a. Meaning of Ratio Analysis.
b. Importance of Ratio Analysis.
c. Limitations of Ratio Analysis.
d. Meaning of Accounting Ratios.
e. Meaning of Current Ratio, its significance and formula.
f. Meaning of Quick Ration, its significance and formula.
g. Meaning of Debt to Equity Ratio, its significance and formula.
h. Meaning of Working Capital Turnover ratio, its significance and formula.
i. Meaning of Net Profit Ratio, its significance and formula.
j. Meaning of Return on Investment Ratio, its significance and formula.
Q.2 Prepare Specific Project 2.
a. Meaning of Cash Flow Statement.
b. Importance of Cash Flow Statement.
c. Limitations of Cash Flow Statement.
Q.3 Prepare Comparative Statement and Common Size Statement for Evaluation Ques.1-8.
Q.4 Calculate Accounting Ratios for practical problems no. 1-146.
Q.5 Prepare Cash Flow Statement for practical problems no. 40-60.
BUSINESS STUDIES
TASK I
Students are supposed to select two units out of four and are required to make one project from
each selected unit. (consist of two projects of 20 marks)
1. Elements of Business Environment
2. Principles of Management
3. Stock Exchange
4. Marketing
Project guidelines are given in G.S.Alag and also discussed in class.
TASK II
Revise the following chapters and complete “TEST YOURSELF” from G.S.Alag for each
chapter. Make a separate notebook for revision work.
Chapter 1 Nature and significance of management
Chapter 2 Principles of Management
Chapter 11 Marketing Management
Chapter 12 Consumer Protection
ECONOMICS
1. Revise the following chapters:
a. Introduction
b. Consumer’s Equilibrium
14
c. Theory of Demand
d. Price Elasticity of Demand
e. Money & Banking
f. Government Budget
g. Balance of Payments
h. Foreign Exchange
2. Complete the following assignments given in the class:
1. Assignment 1: Money & Banking
2. Assignment 2: Government Budget
3. Assignment 3: Consumer’s Equilibrium- Utility Approach
4. Assignment 4: Consumer’s Equilibrium- IC Analysis
5. Assignment 5: Theory of Demand
6. Assignment 6: Foreign Exchange
7. Assignment 7: Central Problems of an Economy
3. Complete back exercise unsolved practicals of Price Elasticity of Demand (1- 84)
4. Prepare project according to the topic and guidelines given in the class.
FOOD PRODUCTION
Written work : Solve all exercises from 1st and 2nd chapter for F. P in your respective note
books.
To Learn :
Learn q/a of chapter 1 and 2
GEOGRAPHY
1) Field survey (pollution)
Students need to follow the following instructions
● Acknowledgement
● Certificate
● Introduction
● Conceptual framework
● Aims & Objectives
● Questionnaire Data collection
● Data collection
● Processing and Tabulation of Data
● Data Analysis
● presentation in graphs
● Conclusion
● suggestions
2) Do the given assignments from the fundamentals of human geography from chapter 1,2,3,4
and 5.
3) Do the given assignments from India, people and economy from chapter 1, and 2.
4) Practice map related to the chapters mentioned above.
14
HOME SCIENCE
1.Identify the problems of adjustments of adolescents with the help of a tool and makereport
2. Spend a day with an aged person (at home /old age home) and observe their needs and
problems, write a report.
3. List and discuss areas of agreement and disagreement of self with a) mother b) father c)
siblings d ) friends e) teacher
4. Visit any one place (home/restaurant/ school canteen) and observe its measure for hygiene and
safe drinking water.
5.Illustrate elements of art and principles of design using paper or cloth and evaluate them.
6.To inspect a food label and evaluate if it has Specification by FSSAI
7.Prepare one label each of item bearing FPO, ISI, Agmark
ASSIGNMENT
1.Other than fssai, mention the standard marks you should
check while buying a bag of wheat flour and a bottle of mango
pickle.
2 List any two facilities which are provided for the workers
at the worksite, under MGNREGA.
3.Draw suitable symbols for the care label of a dress that
indicates that ‘it should not be tumble dried’ and ‘should be ironed at low heat’.
4 What could be two conditions under which the Food Safety and
Standard Authority of India (fssai) has declared that has been declared
adulterated? List two health hazards of consuming such jaggery.
5 Identify eight such areas in the kitchen where unhygienic conditions
can develop and hence need your attention
6 The water in which you soaked the Bengal gram turned yellow .You also find that the shape of
the dal is not uniform . What in your opinion is the reason for these two observations ?Name two
more foods you have noticed which have same problem . What are the health hazards of
consuming such foods?
7 Most villages are suffering from swelling in feet and legs. The Doctor has described it is due to
consumption of some adulterant in their food? What could be the adulterant? Mention other
symptoms associated with this adulterant. Suggest the three ways by which villagers can
safeguard themselves from buying adulterated food.
14
8 Name a suitable chemical which can be used to purify drinking water when you are travelling.
Describe the procedure of purifying water in three steps.
9 Give three suggestions with diagram to your tall and thin brother to choose a suitable design of
kurta for him
10 Give two features of DWCRA
INFORMATICS PRACTICES
● Complete all lab exercises of Chapter 8 to 10 and Chapter 3 in file.
● Revise Ch-3 for all the topics of class XI.
● Attempt the Periodic test paper in the notebook with corrections.
PHYSICAL EDUCATION
1. Revision of covered chapters.
2. Practical file
• Practical-1:Modified AAHPER administration for all items.
• Practical-2: Conduct Barrow 3 Item Test on 10 students.
• Practical-3: Procedure for Asanas, Benefits & Contraindication for any five Asanas
for each lifestyle disease.
• Practical-4: Procedure for administering Senior Citizen Fitness Test for 5 elderly
family members.
• Practical-5: volleyball. Labelled diagram of field & equipment (Rules, Terminologies
& Skills).
• Practical-5 National highest award
Recommended