List of top Questions asked in CBSE Class XI

to give vent to
to be physically strong
Locate the lines in text that support the title. 'The Ailing Planet'.
What does the notice ‘The world’s most dangerous animal’ at a cage in the zoo at Lusaka, Zambia, signify?
How are the earth’s principal biological systems being depleted?
Why does the author aver that the growth of world population is one of the strongest factors distorting the future of human society?
The phrase ‘inter alia’ meaning ‘among other things’ is one of the many Latin expressions commonly used in English. Find out what these Latin phrases mean.
1. prima facie
2. ad hoc
3. in camera
4. ad infinitum
5. mutatis mutandis
6. caveat
7. tabula rasa
Locate the following phrases in the text and study their connotation.
1. gripped the imagination of
2. dawned upon
3. ushered in
4. passed into current coin
5. passport of the future
The words ‘grip’, ‘dawn’, ‘usher’, ‘coin’, ‘passport’ have a literal as well as a figurative meaning. Write pairs of sentences using each word in the literal as well as the figurative sense.
Briefly explain the following statements from the text.
1.“You neither travelled to the past nor the future. You were in the present experiencing a different world.”
2. “You have passed through a fantastic experience: or more correctly, a catastrophic experience.”
3. Gangadharpant could not help comparing the country he knew with what he was witnessing around him.
4. “The lack of determinism in quantum theory!”
5. “You need some interaction to cause a transition.”
Discuss the following statements in groups of two pairs, each pair in a group taking opposite points of view. 
i. A single event may change the course of the history of a nation. 
ii. Reality is what is directly experienced through the senses. 
iii. The methods of inquiry of history, science and philosophy are similar.
In which language do you think Gangadharpant and Khan Sahib talked to each other? Which language did Gangadharpant use to talk to the English receptionist?
In which language do you think Bhausahebanchi Bakhar was written?
There is mention of three communities in the story: the Marathas, the Mughals, the Anglo-Indians. Which language do you think they used within their communities and while speaking to the other groups?
They used their traditional slang of language when the talk to each other but they speak to other groups the use the language that is accepted by the people belonging to all three communities.
Given below is the scientific name of Mango. Identify the correctly written name. 
Mangifera Indica
Mangifera indica
Define a taxon. Give some examples of taxa at different hierarchical levels.
What will be the conjugate bases for the Brönsted acids: HF, H2SO4 and HCO3–?
Write the conjugate acids for the following Brönsted bases: NH2–, NH3 and HCOO–.
Describe the effect of: 
  1. addition of H2
  2. addition of CH3OH
  3. removal of CO
  4. removal of CH3OH 

on the equilibrium of the reaction:
\(2H_2(g) + CO (g) ⇋ CH_3OH (g)\)

Can you identify the correct sequence of taxonomical categories?
(a) Species → Order → Phylum → Kingdom
(b) Genus → Species → Order → Kingdom
(c) Species → Genus → Order → Phylum
The species: H2O, HCO3–, HSO4– and NH3 can act both as Brönsted acids and bases. For each case give the corresponding conjugate acid and base.
Try to collect all the currently accepted meanings for the word ‘species’. Discuss with your teacher the meaning of species in case of higher plants and animals on one hand, and bacteria on the other hand.
Classify the following species into Lewis acids and Lewis bases and show how these act as Lewis acid/base: (a) OH– (b) F– (c) H+ (d) BCl3
The concentration of hydrogen ions in a sample of soft drink is 3.8 × 10–3 M. What is its pH?