Kendriya Vidyalaya AFS No. 1 Jamnagar SUMMER VACATION HOLIDAY HOMEWORK

CLASS XII ENGLISH

1. Read and write summary of novel “The Invisible Man”2. Read and write question answer of L. 2 “ the Tiger King” and L.4 “ The Enemy” form

the book Vistas.3. Select, read and write notes on any one article from newspaper. Select topic for the

article alphabetically i.e. 1 to 26 A to Z again 27 to 43 A to Z.

BIOLOGY

Q.1-In which type of reproduction, do we associate the reduction division? Analyse the reasons for it.

Q.2-Why do we refer to offspring formed by asexual method of reproduction as clone?

Q.3-Draw the sketches of zoospore and a conidium. Mention two dissimilarities between them and atleast one feature common to both structures.

Q.4-Justify the statement vegetative reproduction is also a type of asexual reproduction.

Q.5- Differentiate between:

a) Oestrous cycle and menstrual cycle

b) Ovipary and vivipary

Q.6-Define pollination and its types?

Q.7-Draw different types of ovules in angiosperm and explain.

Q.8-Differenciate between Apocarpous and Syncarpous gynoecium.

Q.9-Draw structure of embryo sac and explain.

Q.10-Give four characteristics of wind pollinated flowers.

CHEMISTRY

SOLID-STATE1 How will you distinguish between the following pairs of terms:

(i) Tetrahedral and octahedral voids (ii) Crystal lattice and unit cell2 (i) Write the type of magnetism observed when the magnetic moments are aligned in parallel and anti-

parallel directions in unequal numbers.(ii) Which stoichiometric defect decreases the density of the crystal?(iii)Which stoichiometric defect increases the density of a solid?

3 Define the following terms in relation to crystalline solids: (i) Unit cell (ii) Coordination numberGive one example in each case.

4 Explain with suitable examples the following :(a) n-type and p-type semiconductors (b) F-centers (c) Ferromagnetism

5 A compound forms hexagonal close-packed structure. What is the total number of voids in 0.5 mol of it? How many of these are tetrahedral voids?

6 Analysis shows that a metal oxide has the empirical formula M 0.96 O1.00 Calculate the percentage of M2+ and M3+ ions in this crystal?

7 (i) What type of non-stoichiometric point defect is responsible for the pink colour of LiCl?(ii) What type of stoichiometric defect is shown by NaCl?

8 The density of copper metal is 8.95 g cm –3 . If the radius of copper atom be 127.8 pm, is the copper unit cell body-centred cubic or face-centred cubic? (Given: atomic mass of Cu = 63.54 g mol–1 and N A = 6.02 × 10 23mol–1)

9 Niobium crystallises in body-centred cubic structure. If density is 8.55 g cm–3, calculate atomic radius of niobium using its atomic mass 93 u.

10 Iron has a body centred cubic unit cell with a cell dimension of 286.65 pm. The density of iron is7.87 g cm–3. Use this information to calculate Avogadro’s number. (At. mass of Fe = 56.0 u)

11 Calculate the packing efficiency of a metal crystal for a simple cubic lattice.12 Account for the following: (i) Schottky defects lower the density of related solids.

(ii) Conductivity of silicon increases on doping it with phosphorus13 Aluminium crystallises in a cubic close-packed structure. Its metallic radius is 125 pm.

(i) What is the length of the side of the unit cell?(ii) How many unit cells are there in 1.00 cm3 of aluminium?

14 Explain the following with suitable examples:(i) Ferromagnetism (ii) Ferrimagnetism (iii) Antiferromagnetism (iv) 12-16 and 13-15 group comp.

15 If the radius of the octahedral void is r and radius of the atoms in closepacking is R, derive relation between r and R.

SOLUTION

1A solution containing 15 g urea (molar mass = 60 g mol–1) per litre of solution in water has the same osmotic pressure (isotonic) as a solution of glucose (molar mass = 180 g mol–l) in water. Calculate the mass of glucose present in one litre of its solution.

2 A solution of glucose (molar mass = 108 g mol–1) in water is labelled as 10% (by mass). What would be the molality and molarity of the solution? (Density of solution = 1.2 g mL–1)

3 1.0 g of a non-electrolyte solute dissolved in 50 g of benzene lowered the freezing point of benzene by 0.40 K. Find the molar mass of the solute. (Kf for benzene = 5.12 kg mol–1)

4 A solution of glycerol (C3H8O3) in water was prepared by dissolving some glycerol in 500 g of water. This solution has a boiling point of 100.42°C. What mass of glycerol was dissolved to make this solution? (Kb for water = 0.512 K kg mol–1)

5 A solution prepared by dissolving 8.95 mg of a gene fragment in 35.0 mL of water has an osmotic pressure of 0.335 torr at 25°C. Assuming that the gene fragment is a non-electrolyte, calculate its molar mass.

6 What mass of NaCl must be dissolved in 65.0 g of water to lower the freezing point of water by 7.50°C? The freezing point depression constant (Kf) for water is 1.86 C/m. Assume van’t Hoff factor for NaCl is 1.87. (Molar mass of NaCl = 58.5 g).

7 100 mg of a protein is dissolved in enough water to make 100 mL of a solution. If this solution has an osmotic pressure 13.3 mm Hg at 25° C, what is the molar mass of protein? (R = 0.0821 L atm mol–1 K–1 and 760 mm Hg = 1 atm.)

8 State Raoult’s law for a solution containing volatile components. Name the solution which follows Raoult’s law at all concentrations and temperatures.

9 Define the following terms: (i) Azeotrope (ii) Osmotic pressure (iii) Colligative properties (iv) Ideal solution

10 How does Raoult’s law become a special case of Henry’s law?11 Explain the following: (i) Henry’s law about dissolution of a gas in a liquid.

(ii) Boiling point elevation constant for a solvent.12 Derive an equation to express that relative lowering of vapour pressure for a solution is equal to

the mole fraction of the solute in it when the solvent alone is volatile.13 If N2 gas is bubbled through water at 293 K, how many millimoles of N2 gas would dissolve in 1 litre of

water. Assume that N2 exerts a partial pressure of 0.987 bar. Given that Henry’s law constant for N2 at 293 K is 76.48 kbar.

14 Henry’s law constant for CO2 in water is 1.67x108 Pa at 298 K. Calculate the quantity of CO2 in 500 mL of soda water when packed under 2.5 atm CO2 pressure at 298 K.

15 The vapour pressure of pure liquids A and B are 450 and 700 mm Hg respectively, at 350 K . Find out the composition of the liquid mixture if total vapour pressure is 600 mm Hg. Also find the composition of the vapour phase.

16 Boiling point of water at 750 mm Hg is 99.63°C. How much sucrose is to be added to 500 g of water such that it boils at 100°C.

17 Calculate the osmotic pressure in pascals exerted by a solution prepared by dissolving 1.0 g of polymer of molar mass 185,000 in 450 mL of water at 37°C.

18 0.6 mL of acetic acid (CH3COOH), having density 1.06 g mL–1, is dissolved in 1 litre of water. The depression in freezing point observed for this strength of acid was 0.0205°C. Calculate the van’tHoff factor and the dissociation constant of acid.

19 Concentrated nitric acid used in laboratory work is 68% nitric acid by mass in aqueous solution. What should be the molarity of such a sample of the acid if the density of the solution is 1.504 g mL–1?

20 A sample of drinking water was found to be severely contaminated with chloroform (CHCl3) supposed to be a carcinogen. The level of contamination was 15 ppm (by mass):(i) express this in percent by mass(ii) determine the molality of chloroform in the water sample.

Sub- Computer Science

Q.1 What do you mean by CALL BY VALUE and CALL BY REFERENCE?

Q.2 What is the difference between TYPE CASTING and TYPE CONVERSION?

Q.3 Explain: DEFAULT ARGUMENT Vs FUNTION OVERLOADING.

Q.4 What is the difference between BREAK and CONTINUE?

Q.5 How STATIC DATA MEMBER is different from other data member ?

Q.6 What are the advantages and disadvantages of INLINE functions?

Q.7 What is the significance of ACCESS LABELS in a class?

Q.8 Define a class RESORT with the following description:

Private Members:RNo //Data member to store Room NoName //Date member to store Customer NameCharges //Data member to store per day chargesDays //Data member to store number of days of stayCALC() //A function to calculate and return Amount as Days*Charges and if the value of Days*Charges is more than 10000 then as 1.25*Days*ChargesPublic Members:CHECKIN() // A function to enter the content RNo, Name, Charges and Days CHECKOUT() //A function to display the content of RNo, Name, Charges,Days and Amount (Amount to be displayed by calling CALC()function)

Q.9 Define a class Departmental with the following specification :

private data members Prod_name string (45 charactes) [ Product name] Listprice long Dis_Price long [ Discount Price] Net long [Net Price ] Dis_type char(F or N) [ Discount type]

Cal_price() – The store gives a 10% discount on every product it sells. However at the time of festival season the store gives 7% festival discount after 10% regular discount. The discount type can be checked by tracking the discount type. Where ‘F’ means festival and ‘N’ means Non- festival .The Cal_price() will calculate the Discount Price and Net Price on the basis of the following table.

Product Name List Price(Rs.)Washing Machine

12000

Colour Television 17000Refrigerator 18000OTG 8000CD Player 4500

public members

Constructor - to initialize the string elements with “NULL”, numeric elements with 0 and character elements with ‘N’Accept() - Ask the store manager to enter Product name, list Price and discount type . The function will invoke Cal_price() to calculate Discount Price and Net Price .ShowBill() - To generate the bill to the customer with all the details of his/her purchase along with the bill amount including discount price and net price.

Q.10 Define a class Garments in C++ with the following descriptions:Private members:

GCode of type stringGType of type stringGsize of type integerGFabric of type stringGPrice of type float

A function assign () which calculates and assigns the value of GPrice as follows: for the value of Gfabric “COTTON”

GType GPrice ( )₹TROUSER 1300SHIRT 1100

FOR GFabric other than “COTTON” the above mentioned GPrice gets reduced by 10%Public Members: A constructor to assign initial values of GCode, Gtype and GFabric with the word “NOT

ALLOTTED” AND GSize AND GPrice WITH 0. A FUNCTION Input() to input the values of the data members Gcode, Gtype, GSize and

GFabric and invoke the Assign() function. A function Display() which displays the content of all the data members for a Garment.

Q.11 The following code is from a game, which generate a set of 4 random numbers. Praful is playing this game, help him to identify the correct option(s) out of the four choices given below as the possible set of such numbers generated from the program code so that he wins the game. Justify your answer.

#include<iostream.h>#include<stdlib.h>const int LOW=25;void main(){ randomize();

int POINT=5, Number;for(int I=1;I<=4;I++){

Number=LOW+random(POINT);cout<<Number<<":" <<endl;

POINT--; } }(i) 29:26:25:28:(ii) 24:28:25:26:

(iii) 29:26:24:28;(iv) 29:26:25:26:

Q.12 What is the difference between GLOBAL and LOCAL variable?

Q13. Write a function in C++ which accepts a 2D array of integers and its size as arguments and displays elements which are exactly two digit number.

Q14 Name the header file(s) that shall be needed for successful compilation of the following C++ code :

void main( )

{ char Text[40];

strcpy(Text,”AISSCE”);

puts(Text);

}

Q15 Write a function to print all the prime numbers stored in a 2-D Array.

Q.16. Draw a Logical Circuit Diagram for the following Boolean expression:

A.(B+C’)

Q.17 Express the F(X,Z)=X+X’Z into canonical SOP form.

Q.18 If F(a,b,c,d)=∑(0,2,4,5,7,8,10,12,13,15), obtain the simplified form using K-Map.

Q19 Write a function in C++ which accepts an integer array and its size as arguments and interchange the value of each elements as follow :-

before :- 1 2 3 4 5 6 after :- 2 1 4 3 6 5

Q20 Explain the following terms with example: (i) typecasting (ii) typedef (iii) call by value and call by reference (iv) #define (v) Actual Parameters and Formal Parameters.

Q21 Write a program to enter a string and print every word in a new line.

Q22 Write a program to enter integers into 2D array (3X3) and display the array’s mirror image.

Q23 Write a program to enter n integers into an array of integers and multiply all even position’s number by 2 and all odd position’s integers by 3 and display the result(Note :-array starting from index number 0).

Q24 Write a function in C++ which accepts an integer array and its size as arguments and swaps the elements of every even location with its following odd location.

Example: If an array of nine elements initially contains the elements as 2, 4, 1,6,5,7,9,23,10 then the function should rearrange the array as 4,2,6,1,7,5,23,9,10.

Q25 Differentiate between Object based programming and Object Oriented programming.

Physics Chap. 1 & 2 theory question

1. State Coulomb's law and express it in vector form.2. State Gauss theorem and apply it to find the electric field at a point due to (a) a line of charge (b) A plane sheet of charge (c) A Charged spherical conducting shell 3. Derive an expression for the electric field at a point on the axial position of an electric dipole. And electric field at a point on the equatorial position of an electric dipole.4. Derive an expression for the energy stored in a capacitor. 5. Derive an expression for the effective capacitance when capacitors are connected in (a) series and (b) parallel 6. Explain the principle of a capacitor and derive an expression for the capacitance of a parallel plate capacitor. 7. What are dielectrics? Distinguish polar and nonpolar dielectrics. Define the term Polarization vector. 8. Show that the work done in an electric field is independent of path.9. Derive an expression for the torque on an electric dipole in a uniform electric field. 10. Derive an expression for the work done in rotating an electric dipole in a uniform electric field 11. Derive an expression for the energy stored (Potential Energy) in a dipole in a uniform electric field. 12. Derive an expression for the electrostatic potential energy of a system of point charges 13. Define electric potential at a point. Derive an expression for the electric potential at a point due to (a) a point charge (b) a system of point charges.

Mathematics