Solving Sample Papers is the most important exercise before appearing for the actual exam. It provides us an insight as to how the actual paper will be. In this article we have shared sample papers of CBSE class 12 for all the subjects.
Biology sample papers of CBSE class 12
- Question paper 2018 : CBSE-BIOLOGY-CLASS-12-SAMPLE-PAPER-2018
- Marking Scheme for the paper of 2018 : CBSE-BIOLOGY-CLASS-12-MARKING-SCHEME-2018
- Question paper 2017 : CBSE-CLASS-12-BIOLOGY-PAPER-2017
- Marking Scheme for the paper 0f 2017 : CBSE-CLASS-12-BIOLOGY-MARKING-SCHEME-2017
- Question paper 2016 : CBSE-BIOLOGY-CLASS-12-PAPER-2016
- Marking scheme for the paper of 2016 : CBSE-BIOLOGY-CLASS-12-PAPER-MARKING-SCHEME-2016
Important Questions from 2017 Board Papers – Biology
- A mature embryo-sac in a flowering plant may possess 7-cells, but 8-nuclei. Explain with the help of a diagram only.
- During a medical investigation, an infant was found to possess an extra chromosome 21. Describe the symptoms the child is likely to develop later in the life.
- A number of passengers were severely burnt beyond recognition during a train accident. Name and describe a modern technique that can help hand over the dead to their relatives.
- What precaution(s) would you recommend to a patient requiring repeated blood transfusion? If the advise is not followed by the patient, there is an apprehension that the patient might contract a disease that would destroy the immune system of his/her body. Explain with the help of schematic diagram only how the immune system would get affected and destroyed.
Chemistry sample papers of CBSE class 12
- Question paper 2018 : CBSE-CHEMISTRY-CLASS-12-SAMPLE-PAPER-2018
- Marking Scheme for the paper of 2018 : CBSE-CLASS-12-CHEMSITRY MARKING-SCHEME-2018
- Question paper 2017 : CBSE-CHEMISTRY-CLASS-12-SAMPLE-PAPER-2017
- Marking Scheme for the paper 0f 2017 : CBSE-CHEMISTRY-CLASS-12-SAMPLE-PAPER-20171
- Question paper 2016 : 12-Chemistry-CBSE-Sample-Papers-2016
Important Questions from CBSE Board 2017
- Write one similarity between Physisorption and Chemisorption.
- Define the following terms: (i) Colligative properties (ii) Molality (m)
- Write the equations involved in the following reactions: (i) Wolff-Kishner reduction (ii) Etard reaction
- A 10% solution (by mass) of sucrose in water has freezing point of 269.15 K. Calculate the freezing point of 10% glucose in water, if freezing point of pure water is 273.15 K. Given: (Molar mass of sucrose = 342 g/mol) (Molar mass of glucose = 180 g/mol)
- Write one difference in each of the following: (i) Lyophobic sol and Lyophilic sol (ii) Solution and Colloid (iii) Homogeneous catalysis and Heterogeneous catalysis.
- Following compounds are given to you: 2-Bromopentane, 2-Bromo-2-methylbutane, 1-Bromopentane (i) Write the compound which is most reactive towards SN 2 reaction. (ii) Write the compound which is optically active. (iii) Write the compound which is most reactive towards β-elimination reaction.
- Do the following conversions in not more than two steps: (i) Benzoic acid to benzaldehyde (ii) Ethyl benzene to Benzoic acid (iii) Prapanone to Propene.
- Write the structures of the monomers used for getting the following polymers: (i) Dacron (ii) Melamine – formaldehyde polymer (iii) Buna-N
- Define the following: (i) Anionic detergents (ii) Broad spectrum antibiotics (iii) Antiseptic
