The post 12th Class Computer Science Pre-Mid Exam 2022 appeared first on Class Notes.

]]>- All questions are compulsory
- Give examples wherever possible

Def add(a b)

return a+b:

print( “The sum =” Sum(7,-1)

- Built in functions and functions using libraries
- Default argument and positional arguments.

a) def sum(a=1,b):

return a+b

print(sum(b=20, a=5 ))

b) def sum(a=1,b):

return a+b

print (sum(10,20))

- Check if a number entered by the user to check whether a number is even or not also if it is divisible by 6 or not.
**(3)** - Calculate and display average of all the elements in a user defined tuple containing numbers.
**(4)**

- sring1=’Computer Science’

print(string1.isupper()) - import math as m

print(m.ceil(15.890)) - stringl=’Tonight’

print(len(stringl)) - import math as m

print(m.pow(5,2))

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]]>The post 12th Pre-Mid Term Physics Examination 2022-23 appeared first on Class Notes.

]]>- There are 12 questions in all. All questions are compulsory. (12th Pre-Mid Term Physics Examination)
- This question paper has four sections: Section A, Section B, section C and Section D.
- Section A contains six questions of one mark each including assertion and reasoning, Section B contains five questions of two marks each, Section C contains three questions of three marks each and section D consist of case study-based question of five marks.
- There is no overall choice
- use of calculator is not allowed

**Question 01:** Define-polar and non polar dielectrics.

**Question 02:** When the electric field lines of force are straight and when they are curved?

**Question 03:** Draw an equipotential surface for a uniform electric field in X -direction.

**Question 04: **Will there be any effect on potential at a point if the medium around this point is changed?

**Directions:** These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.

- If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
- If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion,
- If the Assertion is correct but Reason is incorrect
- If both the Assertion and Reason are incorrect.

**Question 05: Assertion:** Electron move away from a region of lower potential to a region of higher potential.

**Reason:** An electron has a negative charge.

**Question 06: Assertion:** A metallic shield in form of a hollow shell may be built to block an electric field.

**Reason:** In a hollow spherical shield, the electric field inside it is zero at every point.

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]]>The post 12th Class Chemistry Pre-Mid Term Examination 2022-23 appeared first on Class Notes.

]]>- Questions 1 to 5 carry
**1 marks**each - Questions 6 to 9 carry
**2 marks**each - Questions 10 to 13 carry
**3 marks**each - Question 14 to carry
**5 marks**

Define reverse **osmosis**?

What is the importance of Henry’s Law Constant?

What role does molecular interaction play in a solution of alcohol and water?

If the molality of dil solution is doubled, the value of molal depression constant Kf will be _______ .

Write the structure of 4-tertbutyl-3-iodoheptane.

If N2 gas is bubbled through water at 293K, how many mill moles of N2 gas would be dissolved in one litre of water? Assume that N2 exerts a partial pressure of 0.987 bar. Given that Henry’s Law Constant for N2 at 293k is 76.48kbar.

Write the lupac name of the following compounds and classify them as well

i. CH3 = C(Cl)CH2Cj(CH3)2

ii. o-Br-C6H4CH(CH3)Ch2CH3

Derive a relationship between relative lowering of vapour Pressure and molar mass of solute.

Calculate the boiling point of 1 molar solution of solute (molar mass 74.5 g / mol)

**Complete the following reactions:**

Acetone

1.

CH3CH2CH2Cl→

2.

CH2CH2OH + HBr (Heat)→

3.

CH(CH3)2 + Br2→

An aqueous solution of 3.12g of BaCl2 in 250g water is found to boil at 100.832°C. Calculate the degree of dissolution of BaCl2 (kb=0.52K/m)

- How does mole fraction of HCL gas in its solution in cyclo hexane varies with partial pressure of HCL(g)?
- Show with the help of graph?
- How can we calculate the value of KH with the help of graph?

- How will you differentiate between Sandmayer and Gattermann reaction. (any two difference including reaction)
- The reaction of C6H5-CH = CH-CH3 with HBr produces _________ .

**Define the following:**

- Finkelstein reaction
- Balzscheimann reaction
- Melting point of isomeric haloarene

**Read the passage given below and answer the questions:**

The properties of the solutions which depends only on the number of solute particles but not on the nature of the solute are called colligative properties. Relative lowering in vapour pressure is also an example of colligative properties. For an experiment, sugar solution is prepared for which lowering in vapour was found to be 0.061 mm of Hg. (vapour pressure of water at 200 C is 17.5 mm of Hg.

**The following questions are multiple choice questions. Choose the most appropriate answer**

**Relative lowering of vapour pressure for the given solution is**- 0.00348
- 0.061
- 0.122
- 1.75

**The vapour pressure (mm of Hg) of solution will be**- 17.5
- 0.61
- 17.439
- 0.00348

**Mole fraction of sugar in the solution is**- 0.00348
- 0.9965
- 0.061
- 1.75

**If weight of sugar taken is 5 g in 108 g of water then molar mass of sugar will be**- 358
- 120
- 240
- 400

**The vapour pressure (mm of Hg) of water at 293 K when 25 g of glucose is dissolved in 450 g of water is**- 17.2
- 17.4
- 17.120
- 17.02

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]]>The post 12th Pre-Mid Term Mathematics Examination 2022-23 appeared first on Class Notes.

]]>**SECTION A**: Q (1 to S) short answer type Questions of 1 marks each.**SECTION B**: Q (6 to 12) of 2 marks each.**SECTION C**: Q (13 to 24) long answer type Questions of 3 marks each.**SECTION D**: Q (25 to 29) long answer type Questions of 5 marks each.

**Chapter 1: Relations and Functions**

- Types of relations:
- Reflexive
- Symmetric
- transitive and equivalence relations
- One to one and onto functions
- composite functions
- inverse of a function
- Binary operations

**Chapter 2: Inverse Trigonometric Functions**

- Definition, range, domain, principal value branch
- Graphs of inverse trigonometric functions
- Elementary properties of inverse trigonometric functions

**Chapter 1: Matrices**

- Concept, notation, order, equality, types of matrices, zero and identity matrix, transpose of a matrix, symmetric and skew symmetric matrices.
- Operation on matrices: Addition and multiplication and multiplication with a scalar
- Simple properties of addition, multiplication and scalar multiplication
- Non-commutativity of multiplication of matrices and existence of non-zero matrices whose product is the zero matrix (restrict to square matrices of order 2)
- Concept of elementary row and column operations
- Invertible matrices and proof of the uniqueness of inverse, if it exists; (Here all matrices will have real entries).

**Chapter 2: Determinants**

- Determinant of a square matrix (up to 3 × 3 matrices), properties of determinants, minors, co-factors and applications of determinants in finding the area of a triangle
- Ad joint and inverse of a square matrix
- Consistency, inconsistency and number of solutions of system of linear equations by examples, solving system of linear equations in two or three variables (having unique solution) using inverse of a matrix

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]]>The post CBSE 12th Class Date Sheet 2021: All Streams appeared first on Class Notes.

]]>- Class-XII examinations will be conducted in two shifts.
- Schedule of the examinations would be as follows:

SHIFT |
First Shift |
Second Shift |

SCHEDULE OF EXAMINATIONS |
From 10.30 AM to 01.30 PM | From 02.30 PM to 05.30 PM |

DISTRIBUTION OF ANSWER BOOK TO THE CANDIDATES |
Between 10.00 A.M. – 10.15 A.M. | Between 02.00 P.M. – 02.15 P.M. |

- Duration of time for each paper has been indicated in the Date-Sheet.
- However, duration of time for each subject / paper as given on the question paper be followed meticulously.
- Candidates would write their particulars on the answer book.
- Particulars shall be checked and signed by Assistant Superintendent(s).
- After distribution of Answer Books, 15 minutes time will be given to candidates for reading the
**question paper**. - Candidates would plan proper strategy to write the answers.
- At 10.30 A.M (morning shift) / 02.30 P.M. (afternoon shift), candidates will start writing the answers.
- No enquiries about date of declaration of result shall be attended to.
- For updates, please visit CBSE’s website www.cbse.nic.in

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]]>The post CBSE Class 12 History 2020-21 Sample Paper appeared first on Class Notes.

]]>Check here the sample paper released by the CBSE for Class 12 History exam.

Students can also check the CBSE Class 12 History exam 2020 sample paper on the Education page of India Today. Find the complete sample paper released by CBSE for Class 12 History below:

The post CBSE Class 12 History 2020-21 Sample Paper appeared first on Class Notes.

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