CBSE Sample Paper 2022-23 Class 12 Solutions

CBSE term 2 sample papers for class 12 for 2022-23 with solutions

To understand the exam pattern, students should refer to the CBSE sample paper class 12 pattern. They can find the sample papers of past years’ exams and subsets and the solutions for the same on Extramarks. For students to solve the CBSE sample papers Class 12 is the best way to practice and boost their confidence. They would also know in which subject they need more practice and how much portion is yet left to cover it up.

To prepare for the examination, solving such mock papers is the right thing to do. The CBSE sample question paper can be on the top list for the students regarding practice and revision to be done. It also helps them know the right way to analyse the paper as they can understand the important question marketing scheme.

Marking scheme for CBSE term 2 – Sample paper with solutions

Solving CBSE 12 sample papers is the best way for students to understand the commonly asked questions. They can also know the topics which need to be given extra attention.

CBSE Class 12 Physics sample paper – Overview

 SECTION-A Q1. What type of extrinsic semiconductor crystal is obtained in a pure semiconductor crystal of Si. Draw the energy band diagram of this extrinsic semiconductor so formed. Q2. Consider two different hydrogen atoms. The electron in each atom is in an excited state. According to the Bohr model, is it possible for the electrons to have different energies but the same orbital angular momentum? Justify your answer. SECTION-B Q4. Derive an expression for the frequency of radiation emitted when a hydrogen atom de-excites from level n to level (n – 1). Also, show that for large values of n, this frequency equals the classical frequency of revolution of an electron. Q5. Explain with a proper diagram how an ac signal can be converted into a dc ( pulsating)signal with an output frequency double the input frequency using the PN junction diode. Give its input and output waveforms. Q6. How long can an electric lamp of 100 W be kept glowing by fusing 2 kg of deuterium? Section C Q7. Define wavefront. Draw the shape of the refracted wavefront when the plane incident wave undergoes refraction from optically denser to rarer medium. Hence prove Snell’s law of refraction. Section D The focal length of a convex lens made of glass of refractive index (1.5) is 20 cm. What will be its new focal length when placed in a medium of refractive index 1.25? Is focal length positive or negative? What does it signify? Q11. (a) Name the e.m. waves suitable for radar systems used in aircraft navigation. Write the range of frequency of these waves. (b) If the Earth did not have an atmosphere, would its average surface temperature be higher or lower than what it is now? Explain. (c) An e.m. a wave exerts pressure on the surface on which it is incident. Justify.

CBSE Class 12 Chemistry sample paper – Overview

 SECTION-A 1. Arrange the following in the increasing order of their property indicated (any 2): a. Benzoic acid, Phenol, Picric acid, Salicylic acid (aka values). b. Acetaldehyde, Acetone, Methyl tert butyl ketone (reactivity towards NH2OH). c. ethanol, ethanoic acid, benzoic acid (boiling point) (1×2=2) 2. Solutions of two electrolytes, ‘ A’ and ‘B’, are diluted. The Λm of ‘B’ increases 1.5 times while that of A increases 25 times. Which of the two is a strong electrolyte? Justify your answer. Graphically show the behaviour of ‘A’ and ‘B’. (2) 3. Give reasons to support the answer: a. Presence of Alpha hydrogen in aldehydes and ketones is essential for aldol condensation. b. 3 –Hydroxypentan-2-one shows positive Tollens test. (1×2=2) SECTION-B 4. Account for the following: a. The ammonolysis of chlorobenzene cannot prepare aniline under normal conditions. b. N-ethylethanamine boils at 329.3K, and butanamine boils at 350.8K, although both are isomeric. c. Acylation of aniline is carried out in the presence of pyridine. (1×3=3) SECTION-C 12. Read the passage given below and answer the questions that follow.  Are there nuclear reactions going on in our bodies? There are nuclear reactions constantly occurring in our bodies, but there are very few of them compared to chemical reactions, and they do not affect our bodies much. All physical processes that keep a human body running are chemical processes. Nuclear reactions can lead to chemical damage, which the body may notice and try to fix. They eventually transform to a stable form through radioactive decay a. Why is Carbon -14 radioactive while Carbon -12 is not? (Atomic number of Carbon: 6) b. Researchers have uncovered the youngest known dinosaur bone, dating around 65 million years ago. How was the age of this fossil estimated? c. Which are the two most common radioactive decays in the human body? d. Suppose an organism has 20 g of Carbon -14 at its time of death. Approximately how much Carbon -14 remains after 10,320 years? (Given antilog 0.517 = 3.289) Section-D Write balanced chemical equations for the following:  (i) Reaction of chlorine with hot and concentrated NaOH. Page 4 of 10  (ii) Sulphur dioxide is passed through an aqueous solution of Fe (III) salt. 10. 0.5 g of KCl was dissolved in 100 g of water, and the solution has initially been at 200 C froze at -0.240 C. Calculate the percentage dissociation of the salt.  (Given :Kf for water = 1.86 K kg /mol, Atomic mass: K = 39 u, Cl= 35.5 u) 11. State briefly the principles involved in the following operations in metallurgy. Give an example. (i) Hydraulic washing. (ii) Zone refining.

CBSE Class 12 Mathematics sample paper – Overview

 Section-A 1. A bag contains one red and three white balls. Find the probability distribution of the number of red balls if two balls are drawn randomly from the bag without replacement. 2. Two cards are drawn randomly from a pack of 52 cards one-by-one without replacement. What is the probability of getting the first card red and the second Jk? Section-B 1. Find the vector and the cartesian equations of the plane containing the point ?̂+ 2?̂− ?̂ and parallel to the lines ?⃗ = (?̂+ 2?̂+ 2?̂) + ?(2?̂− 3?̂+ 2?̂) = 0 and ?⃗ = (3?̂+ ?̂− 2?̂) + ?(?̂− 3?̂+ ?̂) = 0 2. If ?⃗ ≠ 0, ⃗⃗⃗ ?⃗. ?⃗⃗ = ?⃗. ?⃗, ?⃗ × ?⃗⃗ = ?⃗ × ?⃗, then show that ?⃗⃗ = ?⃗. Solution: We have ?⃗. (?⃗⃗ − ?⃗) = 0 ⇒ (?⃗⃗ − ?⃗) = ⃗0⃗ or ?⃗ ⊥ (?⃗⃗ − ?⃗) ⇒ ?⃗⃗ = ?⃗ or ?⃗ ⊥ (?⃗⃗ − ?⃗) Also, ?⃗ × (?⃗⃗ − ?⃗) = ⃗0⃗ ⇒ (?⃗⃗ − ?⃗) = ⃗0⃗ or ?⃗ ∥ (?⃗⃗ − ?⃗) ⇒ ?⃗⃗ = ?⃗ or ?⃗ ∥ (?⃗⃗ − ?⃗) ?⃗ ??? ??? ?? ???ℎ ????????????? ?? (?⃗⃗ − ?⃗) ??? ???????? ?? (?⃗⃗ − ?⃗) Hence, ?⃗⃗ = ?⃗. 1 1 1 10. Find the shortest distance between the following lines: ?⃗ = (?̂+ ?̂− ?̂) + ?(2?̂+ ?̂+ ?̂) ?⃗ = (?̂+ ?̂+ 2?̂) + ?(4?̂+ 2?̂+ 2?̂) Section-C 1. Evaluate: ∫ |? 3 − 3? 2 + 2?|?? 2 −1 Solution: The given definite integral = ∫ |?(? − 1)(? − 2)|?? 2 −1 = ∫ |?(? − 1)(? − 2)|?? 0 −1 + ∫ |?(? − 1)(? − 2)|?? + ∫ |?(? − 1)(? − 2)|?? 2 1 1 0 = − ∫ (? 3 − 3? 2 + 2?)?? 0 −1 + ∫ (? 3 − 3? 2 + 2?)?? 1 0 − ∫ (? 3 − 3? 2 + 2?)?? 2 1 = −[ ? 4 4 − ? 3 + ? 2 ]−1 0 + [ ? 4 4 − ? 3 + ? 2 ]0 1 − [ ? 4 4 − ? 3 + ? 2 ]1 2 = 9 4 + 1 4 + 1 4 = 11 4 Section-D 2. Find the foot of the perpendicular from the point (1, 2, 0) upon the plane x – 3y + 2z = 9. Hence, find the distance of the point (1, 2, 0) from the given plane. Solution: The equation of the line perpendicular to the plane and passing through the point (1, 2, 0) is ? − 1 1 = ? − 2 −3 = ? 2 The coordinates of the foot of the perpendicular are (? + 1, −3? + 2,2?) for some ? These coordinates will satisfy the equation of the plane. Hence, we have ? + 1 − 3(−3? + 2) + 2(2?) = 9 ⇒ ? = 1 The foot of the perpendicular is (2, -1, 2). Hence, the required distance = √(1 − 2) 2 + (2 + 1) 2 + (0 − 2) 2 = √14 ????

CBSE Class 12 Biology sample paper – Overview

 Section-A 1. Humans have innate immunity for protection against pathogens that may enter the gut along with food. What are the two barriers that protect the body from such pathogens? 2. Water samples were collected at points A, B and C in a river segment near a sugar factory and tested for BOD level. The BOD levels of samples A, B and C were 400 mg/L, 480 mg/L and 8 mg/L, respectively. What is this indicative of? Explain why the BOD level gets reduced considerably at collection point C? Section-B An ecologist studies an area with population A, thriving on unlimited resources and showing exponential growth, introducing populations B and C to the same area. What will affect the population A, B and C growth pattern when living together in the same habitat? Section-C How do normal cells get transformed into cancerous neoplastic cells? Elaborate, giving three examples of inducing agents. OR A person is suffering from a high-grade fever. Which symptoms will help identify if they are suffering from Typhoid, Pneumonia or Malaria? Section-D Some restriction enzymes break a phosphodiester bond on both the DNA strands, such that only one end of each molecule is cut, and these ends have regions of single-stranded DNA. BamH1is one such restriction enzyme which binds at the recognition sequence, 5’-GGATCC- 3’and cleaves these sequences just after the 5′- guanine on each strand.  a. What is the objective of this action? b. Explain how the gene of interest is introduced into a vector. c. You are given the DNA shown below.

CBSE Class 12 Computer Science sample paper – Overview

 Section-A Give any two characteristics of stacks.  (i) Expand the following:  SMTP, XML (ii) Out of the following, which is the fastest wired and wireless medium transmission? Infrared, coaxial cable, optical fibre, microwave, Ethernet cable Section-B Each question carries 3 marks 8. Julie has created a dictionary containing names and marks as key-value pairs of 6 students. Write a program with separate user-defined functions to perform the following operations: ● Push the keys (name of the student) of the dictionary into a stack, where the corresponding value (marks) is more significant than 75. ● Pop and display the content of the pile. For example: If the sample content of the dictionary is as follows: (3) [4] R={“OM”:76, “JAI”:45, “BOB”:89, “ALI”:65, “ANU”:90, “TOM”:82} The output from the program should be: TOM ANU BOB OM Section-C A table, ITEM has been created in a database with the following fields: ITEMCODE, ITEMNAME, QTY, PRICE Give the SQL command to add a new field, DISCOUNT (of type Integer), to the ITEM table. (ii) Categorise the following commands into DDL and DML commands? INSERT INTO, DROP TABLE, ALTER TABLE, UPDATE…SET Section-D Give two advantages and two disadvantages of star topology.

CBSE Class 12 Business Studies sample paper – Overview

 Section-A Management is essential for organisations that are (a) Non-profit organisations (b) Service organisations (c) Social organisations (d) All of the above 1 2 ‘Twinkle Stars’ is a well-known resort for organising parties, especially for children. However, in the previous 6 months, its popularity has reduced considerably as a new resort with better ambience and facilities has opened within its vicinity. Name the related feature of the business environment that has adversely influenced the business of ‘Twinkle Stars’.  (a) Totality of external forces (b) Dynamic nature (c) Interrelatedness (d) Uncertainty Section-B Which best training method would you suggest so that employees can learn the process? The Style watch company is well known for its stylish watches. It performs various activities like market analysis, product designing, packaging, warehousing, labelling, advertising, pricing, promotion, and sales. The company maintains good customer relations through various customer service activities. ·         Name the concept related to the activities mentioned above. ·         Explain any two features of the activity identified above. Section-C Esha started a company called ‘Fashion Wrap.’ with ten employees to gift pack items for their clients attractively and fashionably called it new style wrapping. The company did very well in its initial years. It paid off, and the company increased its production and expanded its product range with different features. (a) Identify the concept used by Esha through which he was able to steer his company to greater heights. (b) Also, explain any three points of importance of this concept. Section-D Amba Rani works as a corporate event coordinator in an event management company. She has been made an overall official in charge of organising a marriage ceremony for one of the company’s clients. To ensure that the ceremony takes place successfully, she identifies the various activities involved. She divides the work into different task groups like an invitation, decoration committee, and reception committee. In the context of the above case: (a) Identify the function of management being performed by Amba Rani.  (b) Describe briefly the various steps involved in the performance of the function of management as identified in part (1) of the question.

CBSE Class 12 Economics paper – Overview

 Section-A Average Propensity to Consume can never be ………………………… (choose the correct alternative) a) positive b) zero c) more than one d) less than one Wealth is a ……………….concept whereas income is a …………………. concept. (Fill up the blank with correct alternative) a. stock, flow b. flow, stock c. stock, stock d. flow, flow In an economy, the value of Net Factor Income from Abroad is ₹ 200 crores, and the value of Factor Income to Abroad is ₹ 40 crores. Identify the value of Factor Income from Abroad. (Choose the correct alternative) a) ₹ 200 crores b) ₹ 160 crores c) ₹ 240 crores d) ₹ 180 crores Section-B From the following data, calculate (a) Gross Domestic Product at Factor Cost. (b) Factor Income to Abroad S No Particulars Amount (cr) (i) Compensation of employees 800 (ii) Profits 200 (iii) Dividends 50 (iv) Gross national product at market price 1400 (v) Rent 150 (vi) Interest 100 17 Explain the concept of excess demand and the inflationary gap with the help of a diagram. Suggest any two measures to correct this situation. Section-C Which industry received the major setback due to British rule. a. Cement b. Handicraft c. Paper d. Iron and steel The role of RBI is reduced from regulator to facilitator of the financial sector. State whether true or false. What is meant by economic planning? Section-D Explain any three priority environmental issues of India today.

CBSE Class 12 Accountancy sample paper – Overview

 Section-A (i) Why is it necessary to revalue the assets and liabilities in case of admission of a partner? (ii) Land and Building (book value) ₹ 1,60,000 sold for ₹ 3,00,000 through a broker who charged a 2% commission. Journalise the transaction at the time of dissolution of the firm. Section-B One of the partners in a partnership firm has withdrawn ₹ 9,000 at the end of each quarter. Calculate interest on drawings at the rate of 6% per annum. Section-C Jan Dhan Bank, an All India Financial Institution, had 10,000, 12 % debentures of ₹ 100 each, outstanding as of 31st March 2017. These debentures were due for redemption on 30th June 2018. Pass necessary Journal Entries for the redemption of debentures. Also, state the amount of Debenture Redemption Reserve to be created for redemption. Section-D Mudit, Sudhir and Uday are partners in firm sharing profits in the ratio of 3:1:1. Their fixed capital balances are ₹ 4,00,000, ₹ 1,60,000, and ₹1,20,000 respectively.Net profit for the year ended 31st March 2018 distributed amongst the partners was ₹1,00,000, without taking into account the following adjustments:  a) Interest on capitals @ 2.5% p.a.;  b) Salary to Mudit ₹ 18,000 p.a. and commission to Uday ₹ 12,000  c) Mudit was allowed a commission of 6% of divisible profit after charging such commission.

Advantages of solving CBSE class 12 sample papers

To be prepared for the paper of any subject, practice is the most important thing. For students to achieve the milestone in their academic career, there are some CBSE extra questions in the sample papers that they can solve independently. This way, they can increase their chances of scoring well and even plan on further studies. You can easily find the CBSE past year’s question papers associated with your exam. Wondering how that can be helpful? Look at some of the advantages:

• Stay up to date:

Whether dealing with solving questions or other topics, you can always practise through sample papers. Sample papers also make students aware of some latest patterns of the questions and the answers.

• Know the performance:

Just as you follow CBSE revision notes, you must also solve sample papers. It is one of the most effective methods of self-evaluation. Having a good knowledge of the questions provided in the sample paper can also ease the exam fear.

• Good revision:

If you practise for CBSE sample papers for any exam, you get to know the type of questions, the weightage of questions and how to score well. Thus, you can revise the subjects and remember them in a better way.

CBSE sample paper for class 12 – Conclusion

If you want to crack the 12th examination with good marks, you must work harder. And for this, there is a CBSE sample paper class 12 for your rescue. These papers are designed considering the common questions, question pattern, and weightage for each question category.