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Science (English Medium) Class 12 - CBSE Important Questions

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Hydrolysis of sucrose is called ______.

Appears in 2 question papers
Chapter: [10] Biomolecules
Concept: Classification of Carbohydrates >> Disaccharides

What is the role of sulphur in the vulcanisation of rubber?

Appears in 2 question papers
Chapter: [15] Polymers
Concept: Types of Polymerisation Reactions - Rubber

Write the names and structures of the monomers of the following polymers: Buna-N

Appears in 2 question papers
Chapter: [15] Polymers
Concept: Classification of Polymers> Based on Mode of Polymerisation

Write the names and structures of the monomers of the following polymers: Polyvinyl chloride

Appears in 2 question papers
Chapter: [15] Polymers
Concept: Classification of Polymers> Based on Structure

Write names and chemical formulae of monomers used in preparing Buna-N.

Appears in 2 question papers
Chapter: [15] Polymers
Concept: Types of Polymerisation Reactions - Rubber

Write the structures of monomers used the following polymers: 
Nylon - 6, 6

Appears in 2 question papers
Chapter: [15] Polymers
Concept: Types of Polymerisation Reactions - Condensation Polymerisation Or Step Growth Polymerisation

Is   a homopolymer or copolymer? Give reason. 

Appears in 2 question papers
Chapter: [15] Polymers
Concept: Types of Polymerisation Reactions - Copolymerisation

Write the monomers of the following polymer : 

Appears in 2 question papers
Chapter: [15] Polymers
Concept: Some Important Polymers

What use of drugs is used in sleeping pills?

Appears in 2 question papers
Chapter: [16] Chemistry in Everyday Life
Concept: Classification of Drugs

What is meant by the term ‘broad spectrum antibiotics’? Explain.

Appears in 2 question papers
Chapter: [16] Chemistry in Everyday Life
Concept: Compounds with Medicinal Properties >> Antimicrobials

Explain any two chemical methods of food preservation.

Appears in 2 question papers
Chapter: [16] Chemistry in Everyday Life
Concept: Chemicals in Food - Artificial Sweetening Agents and Food Preservatives

The SELECT statement when combined with the ______ clause returns records without repetition.

Appears in 2 question papers
Chapter: [9] Structured Query Language (SQL)
Concept: SQL for Data Query

Write two points of difference between Circuit Switching and Packet Switching.

Appears in 2 question papers
Chapter: [11] Data Communication
Concept: Switching Techniques

Expand the following in the context of Internet Protocol:

POP3

Appears in 2 question papers
Chapter: [11] Data Communication
Concept: Introduction to Protocols

Read the following and answer the question that follows:

The story "Deep Water" has made you realize that with determination and perseverance one can accomplish the impossible. Write a paragraph in about 100 words words on how a positive attitude and courage will aid you to achieve success in life

Appears in 2 question papers
Chapter: [1.3] Deep Water
Concept: Deep Water

How did the instructor “build a swimmer” out of Douglas?

Appears in 2 question papers
Chapter: [1.3] Deep Water
Concept: Deep Water

Why was the peddler surprised at the hospitality he received from the crofter?

Appears in 2 question papers
Chapter: [1.4] The Rattrap
Concept: The Rattrap

Gandhi effectively managed to redress the problems of the indigo sharecroppers with the Lieutenant Governor. What did he achieve?

Appears in 2 question papers
Chapter: [1.5] Indigo
Concept: Indigo

Answer the following question in about 40-50 words.

What can be inferred from Rajendra Prasad’s recorded upshot of the lawyer consultations, at Motihari?

Appears in 2 question papers
Chapter: [1.5] Indigo
Concept: Indigo

Answer the following in about 100125 words.

Has Sophie met Danny Casey? What details of her meeting with Danny Casey did she narrate to her brother?

Appears in 2 question papers
Chapter: [1.8] Going Places
Concept: Going Places
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