Question Papers

Sample Paper – 2010
Class – XII
Subject – Chemistry

Time: 3 Hrs Max Marks: 70
General Instructions:
All questions are compulsory.
Questions 1 to 8 are very short answer type carrying 1 mark each. Answer them in one sentence each.
Questions 9 to 18 are short answer type carrying 2 marks each. Answer each of them in about 30 words.
Questions 19 to 27 are also short answer type carrying 3 marks each. Answer each of them in about 40 words.
Questions 28, 29 & 30 are long answer type carrying 5 marks each. Answer each of them in about 70 words.
Calculators are not permitted. Use log tables if necessary.
-----------------------------------------------------------------------------------------------------------------
1
A crystal of NaCl placed in sodium vapour appears yellow. Why?
1
2
Draw resonating structures of N2O5.
1
3
Define Van’t Hoff factor. Write its value for a dilute solution of K4 [Fe(CN)6].
1
4
What do you mean by selectivity of a catalyst?
1
5
Why reduction of a metal oxide is easier if the metal formed is in liquid state at the temperature of reduction?
1
6
Write IUPAC name: C2H5 O CH2 -CH2 -CH2 O CH3
1
7
Arrange in the increasing order:
CH3CHO, CH3CH2OH, CH3OCH3, CH3 CH2 CH3 --------------- boiling point.
1
8
Complete and balance:
XeF2 + H2O
1
9
On dissolving 3.24g of sulphur in 40g of benzene the b.p of the solution was higher than that of benzene by 0.81K. Kb value for benzene is 2.53Kkgmol-1. Find the molecular formula of sulphur. Atomic mass of sulphur = 32.
2
10
Explain the following:
(i) Osmotic pressure method is preferred to other colligative properties for the determination of molecular mass of proteins and polymers.
(ii) Vapour pressure of solution of glucose in water is lower than that of water.
2
11
The half life for decay of radioactive 14C is 5730 years. An archaeological artifact containing wood has only 80% of 14C activity as found in living trees. Estimate the age of the artifact.
2
12
Out line the principles of refining of metals by:
(i) Zone refining (ii) Vapour phase refining
2
13
(i) What is denaturation of proteins?
(ii) Write reaction of glucose that confirms aldehyde functional group.
2
14
Explain with example:
(i) Reimer Tiemann reaction (ii) Cannizzaro reaction
2
15
Distinguish between:
(i) Acetaldehyde and Acetone (ii) Phenol and Aniline
2
16
Convert the following:
(i) Ethyl bromide to ethyl iodide (ii) Ethanal to But-2-en-al
2
17
An optically active amino acid (A) can exist in three forms depending on the pH of the medium. If the molecular formula of (A) is C3H7NO2, write:
(i) Structure of compound (A) in aqueous medium.
(ii) In which medium will the cationic form of A exist? (iii) In alkaline medium,
towards which electrode will the compound (A) migrate in electric field?
OR



Show formation of Glycosidic linkage and Peptide linkage between Biomolecules by taking examples.
2
18
An optically active compound C7H15Br reacts with aqueous KOH to give a racemic
mixture of products. Write mechanism involved.
2
19
Iron (II) oxide unit cell has a cubic structure and each of the unit cell sides is 5 A0. If the density of this oxide is 4.0 g cm-3, calculate the number of Fe2+ and O2- ions present in each unit cell. Molecular mass of Iron (II) oxide = 78g mol-1, NA = 6 x 1023 mol-1
3
20
(a) What is pseudo first order reaction? Explain with example.
(b) For a first order reaction, show that the time required for 99% completion is twice the time required for the completion of 90% of reaction.
3
21
(i) Draw Freundlich adsorption isotherm.
(ii) What are multimolecular and macromolecular colloids? Write one example each.
3
22
(i) Discuss briefly the role of coordination compounds in:
(a) Biological systems (b) Medicinal chemistry
(ii) Draw labelled diagram to show splitting of d orbitals in an octahedral crystal field.
3
23
Account for the following:
The bond angle in PH4+ is greater than that in PH3?
The oxygen-oxygen bond lengths in ozone are identical (128 pm).
When HCl reacts with finely powdered iron, it forms ferrous chloride and not ferric
chloride.
3
24
(a) A translucent white waxy solid (A) on heating in an inert atmosphere is converted
to its allotropic form (B). Allotrope (A) on reaction with very dilute aqueous KOH
liberates a highly poisonous gas (C) having rotten fish smell.
(i) Identify A, B & C (ii) Write reactions.
OR
(i) Write the conditions required to maximize the yield of sulphuric acid.
(ii) Write equations for the following properties of sulphuric acid:
(a) Strong acidic character (b) Low volatility
(c) Dehydrating nature (d) Oxidizing action.
3
25
(a) What is copolymerization? Give example.
(b) Write monomer of:
(i) PHBV (ii) Neoprene
3
26
Account for the following:
P-nitro phenol is a stronger acid than phenol.
An aq solution of methyl amine reacts with FeCl3 to obtain brown ppt of hydrated ferric oxide.
(c) During preparation of an ester from carboxylic acid and alcohol the aster is distilled as soon as it is formed.
3
27
(i) Mention one important use of each of the following:
(a) Equanil (b) Sucralose
(ii) What is meant by the term ‘broad spectrum antibiotics’? Explain.
3
28
(i) Draw diagram to show the variation of molar conductivity, Λm with respect
to change in concentration of strong and weak electrolytes.
(ii) Calculate standard cell potential of galvanic cell in which the following reaction
takes place: 2 Cr (s) + 3 Cd2+ (aq) 2 Cr3+ (aq) + 3 Cd (aq).
Also find the Gibb’s energy change and the equilibrium constant for the reaction.
E0 Cr3+/Cr =-0.74 V E0 Cd2+/Cd =-0.40 V
OR





(a) Write electrode reactions when a lead storage battery is discharging
(b) Galvanized iron pipe does not rust even if the zinc coating is broken. Why?
(c) Calculate the Λ0 of NH4OH from the following data:
Λ 0 of NaOH = 257.7 Scm2mol-1 Λ 0 of NaCl = 140.6 Scm2mol-1
Λ 0 of NH4 Cl =129.8 Scm2mol-1
5
29
(a) Compare the following about transition and non-transition elements:
(i) Electronic configuration (ii) Variability in oxidation state
(b) Account for the following:
Transition elements possess high enthalpy of atomization.
Lower oxides of transition elements are basic while higher oxides are acidic.
Sodium dichromate is preferred to potassium dichromate as oxidizing agent in organic chemistry.
OR
(i) Write reactions for the preparation of potassium dichromate.
(ii) Write reaction of dichromate ion with Fe2+ in acid medium.
(iii) What is lanthanoid contraction? Explain the cause and write two consequences.
5
30
(a) A compound ‘A’ undergoes haloform reaction and gives ‘B’ on reduction.
When ‘B’ is heated with conc H2SO4 ‘C’ is obtained which forms a mono
ozonide, ‘D’ . Hydrolysis of D in the presence of Zinc dust gives only
acetaldehyde. Identify A,B & C. Write reactions.

(b) Give reasons:
(i) The α- hydrogen atoms of carbonyl compounds are acidic.
(ii) Benzaldehyde is less reactive in Nucleophilic addition reactions.

OR

Identify A, B & C:

(a) C6H5NO2 Fe/HCl (A) NaNO2/HCl (B) H3PO2/Heat (C)

(b) C6 H5 CN H+(aq) ( A) PCl5 (B) H2/Pd/BaSO4 (C)

(c) How do you separate the following mixtures?

(i) 0-Nitrophenol & p-Nitrophenol (ii) Aldehyde & Ketone


5

SAMPLE PAPER: 2010
CLASS: XII
SUBJECT: Informatics Practices


SAMPLE PAPER
CLASS – XII MM - 70
SUBJECT – I P. Time – 3 Hrs.
---------------------------------------------------------------------------------------
Note: (i) This question paper is divided into 3 sections
(ii) Section A consists of 30 Marks.
(iii) Section B and Section C are of 20 marks.
(iv) Answer the questions after carefully..
===============================================
[SECTION - A]
Q.1) Answer the following questions:
a) Write the difference between free software & freeware
software [2]
b) What is SDLC? Name its essential components. [2]
Define Data Warehouse & Meta Data. [2]
Explain Generalization & Specialization
Identify the scope of relationship represented in the following statements and draw an Entity Relationship diagram to sketch it
“ A student can issue multiple books from the library”
“ A customer can purchase only one Motor Bike at a time from Motor Bike show room..” [2]
Q.2) Answer the following questions:
a) What is built-in function? Write different types of built-in functions in VB. [2]
b) Write one difference and one common characteristic between a control and a variable in VB. [2]
c) Differentiate between ADODB project reference and ADODC in a from using suitable control. [2]
d) What is the difference between Call by Value and Call by Reference? [2]
e) What is procedure? Explain Function & sub procedure. [2]

Q.3) Answer the following questions:
What is the need for normalization? Define First, Second and Third normal form. [2]
Differentiate between Decision Control and Looping Control structure in context with PL/SQL. [2]
What is the use of Sub Query? Which query gets executed first – The parent query or Sub Query. [2]
What is the use of %ROWTYPE attribute? Explain with the help of example [2]
What is trigger? Explain its types. [2]




[SECTION – B]
Q.4) Read the following case study and answer the questions that follow:
DAV organization wants to computerize their examination system. Formula and Grading Criteria given below:

Total = English + B. Studies + Accounts + Informatics Practices
Percentage = Total / 4
Percentage >= 90 Grade – A
Percentage >= 70 Grade – B
Percentage >= 50 Grade – C
Percentage >= 33 Grade – D
Percentage < 33 Grade – F






Object Type
Object Name
Description

Form
Exam
The main form object
Text Box
txtRNo
txtName
txtEng
TxtBStd
txtAcct
txtIP
txtTotal
txtPer
txtRes
txtGrade

Roll No
Name
Marks of English
Marks of Business Studies
Marks of Accounts
Marks of Informatics Pract.
Total
Percentage
Result
Grade

Comand Button
cmdResult
cmdGrade
cmdClear
cmdExit
Button for calculation
Button for grade
Button for clear the text boxes
For close
i) Write the code to locked the textboxes [2]
ii) Write the code to Clear all the text boxes on clicking clear button [2]
iii) Write the code to display Total, Percentage and Result on clicking Cmd_Result command button [4]
iv) Write the code to Grade as per the metioned criteria on clicking Cmd_Grade button. [4]

Q.5) Answer the following questions -
a) Find the errors from the following code segment and rewrite the corrected code underlining the correction made. [2]
i = 0
For i = 1 To 5 Step
S = S + 1
Print S
Select Case (S)
2
S = S + 5
Case
S = S + 7

b) Rewrite the following code using If… Then …. Else construct without affecting the output [2]
Sum = 0
For i = 0 To 4
For j = O To i - 1
Select Case (i + j + 1)
Case -1, 0
Sum = Sum + 1
Case 1, 2, 3
Sum = Sum + 2
Case Else
Sum = Sum + 3
End Select
Next j
Next i
Print Sum
c) Find the output of the following code segment [2]
Dim C As Integer
C = 1
While C <= 10
Print IIf(C Mod 2, "ABCD", "====")
C = C + 1
Wend

[ SECTION – C]
Q.6) Read the questions given below and answer accordingly.
a) Write the output produced by the following PL/SQL code–[2]
Begin
for i in reverse 1..10
loop
if mod (i,2) = 0 then
dbms_output.put_line (to_char( I*10));
end if ;
end loop;
end;

b) Find the errors, if any, in the following PL-SQL code– [2]
Declare
v_empno number[4];
v_empName varchar2(20);
begin;
select empno, ename, salary into v_empno, v-ename from emp for empno = 7789;
end;

c) Write the difference between IN and OUT parameter. [2]

d) Write a PL-SQL code to check whether the number is
Even or Odd. [4]


Q.7) Answer the question based on the table CLUB given
below-
CLUB
Column Name
Data Type
Width
Constraints
Member_No
Member_Name
Address
Age
Type
Fees
Number
Varchar2
Varchar2
Number
Varchar2
Number
4
30
30
3
10
6,2
Primary Key
Not Null

>=18
Write the commands to create the table CLUB including constraints
Wrote SQL command to display the details of all the members whose type is “Permanent” and fees is more than Rs. 1000
Write a PL/SQL procedure to delete all the rows of a particular type from the table Club where member_id to be deleted is accepted from the user.
Write a PL/SQL code using an explicit cursor to display the details of all the “Permanent” member whose age is greater than 50. The code should also display the average membership fees of all such members. [4]

2010
Class – XI
Subject - INFORMATICS PRACTICES
Question Paper cum Answer Sheet
Time Allowed: 1:30 Hours Maximum marks: 30
Name: ______________________ Section ________ Date: ___________
Section-A
Q1
There are 6 multiple choice questions. Only one of the options in every question is correct.

Which of the following is hardware:
(a) Mother Board (b) MS-DOS (c)Windows (d) Antivirus
1
The topmost bar in any application window which display the name of the document or application.
(a)Menu bar (b)Status bar (c) Tool bar (d)Title bar
1
Which of the following is not a function of Monitor :
(a)Output b) Graphics Setting (c) Manipulation of file System (d) None of these
1
Which of the following is a smallest unit of memory :
(a)BYTE (b)TB (c) KB (d)NIBBLE
1
Which of the following is not a permanent memory :
(a)SDRAM (b)EPROM (c) HARD DISK (d)OPTICAL DISK
1
Which of the following is a Output Device:
(a) RAM (b)VDU (c) KEYBOARD (d) CPU
1
Q2
Write a correct answer of a following:

Filling the blank (a) Data is a collection of ___________
(b) A set of instruction is called a_______
1
Filling the blank (a) PARAM is a ________
b) The __________, __________ and _______ are three parts of CPU
1
Shortcut key for (a) Open and Save :- ___________________ _________________________
(b)Copy and Paste : ___________________ _________________________
2

Section-B
Q3
Answer the following questions

What are differences between Volatile and Non-Volatile Memory?
Volatile Memory
Non-Volatile Memory
1.








2.









2
What is the role of primary memory? Write various type of Primary Memory.





2
Full form of (a) : ____________________________ (b) LCD :_______________________

(c) PACE: ____________________________________(d) GUI : ________________________

(e)IPO : ______________________________________ (f) MU: _________________________



6
Q4
Answer the following questions

Write a difference between hard ware, software and firmware.
Hardware
Software
Firmware
1.



2.






3
What are differences between Analog computer and Digital computer?
Analog Computer
Digital Computer
1.



2.





3
What is booting? Write down the various Strengths and Weakness of Computer System.













4

2010
Class – X
Subject –Mathematics

Time: 1 hour M.M.23

(1 mark question) set-1
Find the length of the diameter of a circle whose circumference is 44 cm
Find if the sequence is an A.P. . 2,Ö8,Ö18 ,Ö32
One end of the diameter of a circle is (2,3) and the center is (-2,5) find the co ordinates of the other end of the diameter.
A sphere of radius r is divided into four parts find the S.A of one part
Without actual division, find whether 7/30 is terminating or no terminating.
Find the probability of a face card when one card is drawn from a well-shuffled pack of 52 cards.
Evaluate sin52/ cos38 + 2cosec40/sec50
What is the nature of the roots of 2x2-5x+6
Give an example of p (x) ,g(x) ,q(x) and r(x) which satisfies the division algorithm deg p(x)= deg r(x)
If tan A = 5/6 , find the value of 1-cotA
Set-2
1. State the Fundamental Theorem of Arithmetic.

2. The graph of y = f(x) is given below. Find the number of zeroes of f(x).

3. – 1 is a zero of the polynomial P (x) = ax2 – 3 (a-1) x – 5, then final the value of a

4. What is the nature of roots of the quadratic equation 4x2 – 12x – 9 = 0?

5. If the adjoining figure is a sector of a circle of radius 10.5 cm, find the perimeter of the sector.
(Take )
6. The length of tangent from a point A at a distance of 5 cm from the centre of the circle is 4 cm. What will be the radius of the circle?

7 If the intersection point of the more than and less than ogive is (34.8, 30), then find the median of the data.
8. A bag contains 5 red and 4 black balls. A ball is drawn at random from the bag. What is the probability of getting a black ball?
9. What is the distance between two parallel tangents of a circle of radius 4 cm?

10.The height of a tower is 10 m. Calculate the height of its shadow when Sun’s altitude is 45°.

Sample Paper – 2010
Class – X
Subject – SOCIAL SCIENCE

TIME : 3 HOURS M.M. 80










Q.1. What do you mean by NIEO ?
OR
What is meant by Proto – Industrialisation ?
OR
What are Tenements ?
Q.2. Who was Martin Luther ?
OR
Who wrote first historic novel in Bengal ? Name the novel also.
Why concept is used to stress that men enjoy power over women ?
What are ‘Sacred Groves’? Give full form of : J.F.M.
Name the tank built by Iltutmish in Delhi in the 13th century.
‘Solar energy is becoming popular in rural areas and has a bright future in India’. Explain.
What observation one could make from the reaction of American athletes at Mexico Olympic held in 1968 ?
Which concept is used to stress that men enjoy power over women ?
‘Kerela with lower per capita income has a better human development ranking than Punjab. Hence, Per Capita income is not a useful criterion at all and should not be used to compare states. Do you agree? Discuss.
When is the World’s Consumers Day Celebrated ?
Study the given statement and answer the questions that follow :
“It is certain that India cannot rival Britain or Europe in force of arms. The British worship the war-God and they can all of them become, as they are becoming, bearers of arms. The hundreds of millions in India can never carry arms. They have made the religion of non-violence their own.”
Who is this great man who spoke the words.
Give two arguments in support of the statement.
“Muslim Political organizations in India were lukewarm in their response to Civil Disobedience Movement.” Explain.
Explain three features of the Silk Route.
OR
Explain the miserable condition of the Indian weavers during East India Company regime in the 18th
century.
OR
Describe the features of colonial city of India.
Read the extract given below and answer the questions that follow :
“Anyone who had seen me reading would have compared me to a man dying of thirst who was gulping down some fresh, pure water…… Lighting my lamp with extraordinary caution, I threw myself hungrily into the reading. An Easy eloquence, effortless and animated, carried me from one page to the next without my noticing it. A clock struck off the hours in the silence of the shadows, and I heard nothing. My lamp began to run out of oil and produced only a pale light, but still I read
on. I could not even take out time to raise the wick for fear of interrupting my pleasure. How these
new ideas rushed into my brain! How my intelligence adopted them!”
Name the author of this paragraph.
How does one find the writer when he is reading ?
Analyse the message given by the writer to the readers.
OR
Read the following passage and answer the questions given below it :
Why women should not read novels
“Dear children, don’t read these novels, don’t een touch them. Your life will be ruined. You will suffer disease and ailments. Why did the good Lord make you- to wither away at a tender age ? To suffer in disease ? To be despised by your brothers, relatives and those around you ? No. No. You must become mothers; you must lead happy lives; this is the divine purpose. You were born to fulfill this sublime goal, should you ruin your life by going crazy after despicable novels ?”
Mention the source of the given paragraph.
Analyse the message given by the writer to children.
Name the woman social reformer of Calcutta (Kolkata).
What do you know about “Belgium Model” ? Do you think it is good for democracy ? Support your answer with examples.
“The Constitution clearly provided a three fold distribution of Legislative powers between the Union and the State governments.” Explain the statement with examples.
Explain in brief the components of HDI.
“Under COPRA the Government of India has set up three tier Quasi Judicial machinery in order to solve consumer disputes”. Justify this statement.
What steps did French take to create a sense of collective identity among the French people ?
OR
Explain the four major challenges faced by the Democratic Republic of Vietnam.
What is biotechnology ? Explain any five advantages of the use of biotechnology in Indian agriculture.
Which energy source in India is considered as the second major energy source ? Justify your answer by explaining four points.
How can you differentiate between Metalled roads and Unmetalled roads ?
What do you mean by ‘Vote Bank’ ? What are the factors (other than caste) that affect electoral politics ?
“The struggle of the Nepali people is a source of inspiration to democrats all over the world.” Comment.
“The Right to Information Act” acts as a “Watchdog of Democracy”. Explain
What is the difference between disguised and open unemployment ? Explain by giving three examples.
What is Central Bank ? State the important functions of Central Bank.
Nearly all major multinationals are American, Japanese or European such as Nike, Coca-Cola, Pepsi, Honda, Nokia. Give four reasons.
On the political outline map of India, locate the following :
Indian National Congress held in Dec.1920
Peasant Satyagraha Movement
Arid Soil and Red Soil
An oldest oilfield of India.
Major producer state of Sugarcane
A woollen industry located in Haryana

CLASS - XII
SUBJECT - INFORMATICS PRACTICES

TIME : 3 HRS MM : 70

Note :
This Question Paper is divided into 3 sections.
Section A consist of 30 marks .
Section B and Section C are of 20 marks each.
Answer the questions after carefully reading the text.

Section – A

Q 1. Answer the following questions :
How is a back-end linked to a database and a server ? Give one major difference between front end technology and back end technology in term of software projects. Give one example of each. 2
What are different part of decision table ? Give function of each part . 2
What is the role of data dictionary and metadata in data warehouse? 2
What is the significance of object modeling? What tool can be used for object modeling? 2
Distinguish between initial investigation and feasibility study ? 2

Q 2. Answer the following questions :
What is the difference between unloading and hiding of a form? 2
What is the difference between SDI and MDI interface ? 2
What is variable life time ? What is the life time of a local , a public and a module variable ? 2
What do you understand by file system controls ? What is their significance ? 2
How are the connection , command and result set objects related to each other ? 2

Q 3 Answer the following questions :
What are views ? how are they useful ? 2
What do following command do : COMMIT , ROLLBACK , SAVEPOINT ? 2
Differentiate between sql and pl/sql. Distinguish between Anonymous and Named blocks as supported
by PL/SQL. 2
What for %ISOPEN and %FOUND attributes are used ? 2
Define trigger . What do triggers basically do ? How are triggers similar to constraints ? 2

Section – B

Q 4 . Read te following case study and answer the questions that follow :
Mr. Anil Dutpuri works in karma Textile as a programmer . He is required to develop a employee record. The company have two types of employee , regular and casual stored in list box, with different job status. The company also offers 10 % of their salary as an incentive to all the employee if they do not take any leave during a month time. Also there is a bonus equal to one month salary to the regular employee in the month of January.



The list of LAST PAGE form is as follows:
Object type
Object name
Form

Text box





List box

Command button






Frmempre

Txtempname
Txttotalleave
Txtmonthlysalary
Txtincentive
Txttotalsalary

Listjobtype

Cmdcalincentive
Cmdcaltotalsalary
Cmdclear
cmdexit

Class – X
Subject – Science
Acids, Bases and Salts

Why should sour substances not kept in brass and copper vessels?1
Why do HCl and HNO3 show acidic behaviour in water while ethanol and glucose do not yet they contain hydrogen in them? 1
How is concentration of OH- ions affected when excess of base is dissolved in water? 1
A baker found that the cake prepared by him is hard and small in size. Which ingredient has he forgotten to add? Give reason. 2
Name the compound which is used to remove hardness of water. 1
What will happen if heating is not controlled in preparing of plaster of Paris? Give equation. 2
A certain compound is alkaline is nature. On exposure to air, it turns into a white opaque powder. Identify the compound and mention its two uses. 3
A white substance having smell of chlorine is used in paper and textile industries. Identify the substance and write the equation of its preparation. 3
What is water of crystallization? Which two features of crystals generally depend on it? 2
What is the concentration of H3O+ and OH- ions in pure water at 25°C? How do these vary when acid is added? 2
Classify the following into acidic, basic and neutral salts. 2
(NH4) 2CO3 b) BaSO4 c) NaNO3 d) K2SO4