February 2023

Chemistry: Solved Previous Year’s Question Paper for NCERT/CBSE  Class 12th Chemistry Paper Code (HSEIIRKo14–1702—Y)

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Question: Why detergents are preferred over soaps?
Answer: Detergents are preferred over soaps because they are more effective in removing dirt, grease, and other stains. Detergents are also more effective at low temperatures, while soaps are less effective. Detergents are also less prone to forming scum on fabric or surfaces, and they often contain fewer harsh chemicals than soaps.

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Chemistry: Solved Previous Year’s Question Paper for NCERT/CBSE Class12th

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Give the electronic configuration of group 16 elements.
Answer: The group 16 elements of the periodic table are oxygen, sulfur, selenium, tellurium, and polonium.
The electronic configuration of each element is as follows:
Oxygen: [He] 2s2 2p4
Sulfur: [Ne] 3s2 3p4
Selenium: [Ar] 3d10 4s2 4p4
Tellurium: [Kr] 4d10 5s2 5p4
Polonium: [Xe] 4f14 5d10 6s2 6p4

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Chemistry: Solved Previous Year’s Question Paper for NCERT/CBSE  Class 12th Chemistry Paper Code (HSEIIRKN15–6417—X)

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Question: How is activation Energy affected by the rise in temperature?
Answer: As temperature rises, activation energy is lowered. This means that reactions will occur faster as temperature increases, as less energy is required to initiate the reaction.

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Chemistry: Solved Previous Year’s Question Paper for NCERT/CBSE  Class 12th Chemistry Paper Code (XIIRKN16–11020—X)

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Question:  Why are artificial sweetening agents needed? Give two examples

Answer: Artificial sweetening agents are needed because they provide a sweet taste to food and beverages without the added calories or health risks associated with consuming large amounts of sugar. Examples include aspartame and sucralose.

Chemistry: Solved Previous Year’s Question Paper for NCERT/CBSE  Class 12th Chemistry Paper Code (XIIRKN16–11020—X) Read More »

Chemistry: Solved Previous Year’s Question Paper for NCERT/CBSE  Class 12th Chemistry Paper Code (HSEIIRKON17 15319—A)

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Distinguish between ideal and non-ideal solutions.
Answer: An ideal solution is a solution that is composed of two or more substances, where all of the substances are completely dissolved and form a homogeneous mixture.
A non-ideal solution is composed of two or more substances, but the components do not mix completely, and the solution is not homogeneous.

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Chemistry: Solved Previous Year’s Question Paper for NCERT/CBSE  Class 12th Chemistry Paper Code (HSE2KROXI 9318—A)

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What are Vitamins? Name the sources and diseases caused by Vitamin B6
Answer: Vitamins are organic compounds that are essential in small amounts for the normal functioning of the body.
They can be obtained from a variety of food sources, including fruits, vegetables, dairy products, grains, and meats.
Sources of Vitamin B6 include fortified cereals, bananas, avocados, potatoes, nuts, and meats. Deficiency of Vitamin B6 can lead to anemia, depression, confusion, irritability, and skin lesions. Severe Vitamin B6 deficiency can cause nerve damage and an increased risk of heart disease.

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Zoology: Solved Previous Year Question Paper for NCERT/ CBSE Class 12th Zoology Paper code (RKDO18 ……20304-Z) 

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Question: What is the significance of “Lac”
Answer: “Lac” is short for the genus Lactobacillus. Many species of Lactobacillus are important in food production, as they are involved in the fermentation process to produce various dairy products, such as yogurt, cheese, and kefir. These bacteria also act as probiotics, providing health benefits to the consumer. Additionally, certain species of Lactobacillus are used in biotechnology to produce lactic acid and other compounds.

Zoology: Solved Previous Year Question Paper for NCERT/ CBSE Class 12th Zoology Paper code (RKDO18 ……20304-Z)  Read More »

Zoology: Solved Previous Year Question Paper for NCERT/ CBSE Class 12th Zoology Paper code (RKDO18 20304-X) 

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Color blindness, also known as color vision deficiency, is the inability to distinguish certain colors in the visible light spectrum. It affects around 8% of men and 0.5% of women, with the most common type being red-green color blindness.
Color blindness can be caused by genetic factors or acquired through injury or disease.
Symptoms include difficulty distinguishing between colors, difficulty identifying colors, and difficulty seeing color in low light or bright light.
Treatment for color blindness is not available, but people with the disorder can often find ways to adapt, such as using color-coded objects or specialized lenses.

Zoology: Solved Previous Year Question Paper for NCERT/ CBSE Class 12th Zoology Paper code (RKDO18 20304-X)  Read More »

Zoology: Solved Previous Year Question Paper for NCERT/ CBSE Class 12th Zoology Paper code (SEIIRKON17-15321-A) 

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Dairy farming is the practice of raising dairy animals for the production of milk and other dairy products, such as cheese, butter, and yogurt. Dairy farming involves a variety of activities, such as breeding, feeding, and milking the animals, as well as caring for them and managing the overall operation of the farm. It also includes processing, packaging, and marketing of the dairy products.

Zoology: Solved Previous Year Question Paper for NCERT/ CBSE Class 12th Zoology Paper code (SEIIRKON17-15321-A)  Read More »

Zoology: Solved Previous Year Question Paper for NCERT/ CBSE Class 12th Zoology Paper code (HSEIIRKON1—-15321-A) 

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Write a short note on ‘MTP’.
Answer: MTP (Mixed Tissue Proteins) are proteins found in multiple tissues of the body. These proteins are involved in various functions such as cell signaling, metabolism, and other cellular processes. They are also involved in the cell-to-cell communication network.

Zoology: Solved Previous Year Question Paper for NCERT/ CBSE Class 12th Zoology Paper code (HSEIIRKON1—-15321-A)  Read More »