Science (English Medium) कक्षा १२ - CBSE Important Questions

Write the names of monomers used for getting the following polymer:

Neoprene

Write the name of the monomer used for getting the following polymer:

Teflon

After the ban on plastic bags, students of a school decided to make people aware of the harmful effects of plastic bags on the environment and Yamuna River. To make the awareness more impactful, they organised a rally by partnering with other schools and distributed paper bags to vegetable vendors, shopkeepers and departmental stores. All the students pledged not to use polythene bags in the future to save the Yamuna River.

After reading the above passage, answer the following questions:
(i) What values are shown by the students?
(ii) What are bio-degradable polymers? Give one example.
(iii) Is polythene a condensation or an addition polymer?

Write the structure of the monomer used in the following polymer:
Buna-S

Write the structures of monomers used the following polymers:
Glyptal

Seeing the growing cases of diabetes and depression among young children, Mr Lugani, the principal of one reputed school, organised a seminar in which he invites parents and principals. They all resolved this issue by strictly banning junk food in schools and introducing healthy snacks and drinks like soup, lassi, milk etc. in school canteens. They also decided to make compulsory half an hour of daily physical activities for the students in the health survey in most of the school and discovered a tremendous improvement in the health of the students

After reading the above passage, answer the following questions:

(i) What are the values (at least two) displayed by Mr Lugani?

(ii) As a student, how can you spread awareness about this issue?

(iii) What are antidepressant drugs? Give an example.

(iv) Name the sweetening agent used in the preparation of sweets for a diabetic patient.

Mr. Roy, the principal of one reputed school organized a seminar in which he invited parents and principals to discuss the serious issue of diabetes and depression in students. They all resolved this issue by strictly banning the junk food in schools and to introduce healthy snacks and drinks like soup, lassi, milk etc. in school canteens. They also decided to make compulsory half an hour physical activities for the students in the morning assembly daily. After six months, Mr. Roy conducted the health survey in most of the schools and discovered a tremendous improvement in the health of students.

After reading the above passage, answer the following :

(i) What are the values (at least two) displayed by Mr. Roy ?

(ii) As a student, how can you spread awareness about this issue ?

(iii) What are tranquillizers ? Give an example.

(iv) Why is use of aspartame limited to cold foods and drinks ?

On the occasion of World Health Day, Dr. Satpal organized a ‘health camp’ for the poor farmers living in a nearby village. After check-up, he was shocked to see that most of the farmers suffered from cancer due to regular exposure to pesticides and many were diabetic. They distributed free medicines to them. Dr. Satpal immediately reported the matter to the
National Human Rights Commission (NHRC). On the suggestions of NHRC, the government decided to provide medical care, financial assistance, setting up of super-speciality hospitals for treatment and prevention of the deadly disease in the affected villages all over India.

(i) Write the values shown by

(a) Dr. Satpal

(b) NHRC

(ii) What type of analgesics are chiefly used for the relief of pains of terminal cancer ?

(iii) Give an example of artificial sweetener that could have been recommended to diabetic patients

Give two examples of macromolecules that are chosen as drug targets

Read the given extract and answer the questions.

1. Why did Charley ask for two tickets? (1)
2. Complete the sentence by choosing the correct option: (1)
   When Charley offered money to the booking clerk, the latter stared at Charley because the booking clerk ______.
   
   1. thought it wasn't money
   2. did not trust Charley
   3. thought Charley was trying to tease him
   4. thought that Charley had given him less money
3. Select the option that best describes Charley in this extract. (1)
   He is ______.
   1. a cheat
   2. gullible
   3. an opportunist
   4. an escapist
4. 'If you're trying to skin me' suggests ______. (1)

Answer the following question in about 40-50 words.

When do the residents of Alsace realise how precious their language is to them?

Answer the following question in about 40-50 words.

What were Franz's feelings as he set out for school and why?

Read the given extract and answer the questions.

1. Complete the sentence with reference to the extract: (1)
   Their eyes are more adjusted to the dark than to the light outside because ______.
2. Which of the following would NOT be true? (1)
   1. The hutments were shining and inviting.
   2. The children's lives were as bleak as their surroundings.
   3. There were no electricity connections.
   4. The boys and girls had got used to the dark.
3. The bangle workers lose their eyesight before they become adults because ______. (1)
   1. they already have poor eyesight
   2. they work in dim light
   3. they are married in childhood
   4. they are malnourished
4. Which of the following most nearly means 'adjusted' in the context of the extract? (1)
   1. conditioned
   2. favoured
   3. accepted
   4. reconciled
5. 'Flickering oil lamps' suggests ______. (1)
6. What is the antonym from the extract of the word 'rarely'? (1)

Answer the following in about 120-150 words.

'Lost Spring' and 'Indigo' bring out how the common man is a victim of exploitation. Explain.

Answer the following question in about 40-50 words.

What vicious circle are the bangle-makers trapped in?

How did Evans manage to smear himself with blood? What effect did it have on the officers?

Answer the following question in about 40-50 words.

What were Douglas's initial thoughts when he was pushed into the pool?

Answer the following in about 120-150 words.

How has human civilization impacted our environment? Comment with reference to the lesson "Journey to the End of the Earth".

The iron master accuses the peddler of not being quite honest. What does the peddler say to justify the situation?

In Edla's dealing with the peddler, she was compassionate and generous. Discuss with reference to the story "The Rattrap".