DPP - 28092021021BHPAT : Daily Practice Problems - Environmental Science (333) - 28/09/2021

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Q1. Define the terms : Ecology, niche, species, extinction.
Q2. What do you understand by ‘Variation and Natural Selection’? In what way do they interact to cause evolution?
Q3. What is the role of isolation in the formation of new species and keeping them distinct.
Q4. In what ways have humans caused the extinction of species?
Q5. What do you understand by (i) natality (ii) speciation (iii) mutation (iv) extinction
Q6. Explain ‘ecological succession’.
Q7. State and explain community characteristics.
Q8. What are (i) climax community and (ii) pioneer species?
Q9. Write an essay on biotic interaction.
Q10. Define biotic Interaction. Describe any one type of positive, negative and neutral quotation.
Q11. Define the following terms.
(i) Autotrophs
(ii) Heterotrophs
(iii) Primary carnivores
(iv) Saprotophs
(v) Omnivores
Q12. Give reasons whether the following statements are true or false.
(i) Food chains are more stable than food webs.
(ii) Pyramids of energy are never inverted where as pyramid of biomass may be inverted.
(iii) A detritus food chain begins with autotrophs.
(iv) Phytoplankton is the term applied to floating organisms in a pond.
(v) Aphotic is the upper zone of a pond.
Q13. Give reasons for the following statements:
(i) We see more wall lizards near the tube light during summer.
(ii) Energy pyramids are never inverted.
(iii) We can not directly use atmospheric nitrogen.
(iv) There is higher concentration of cabon dioxide in the aphotic zone.
(v) Food chains have a limited number of steps
Q14. What is an ecosystem? Explain its structural components.
Q15. Define decomposers and give their role in sustaining an ecosystem.
Q16. Why are ecosystems dynamic in nature? Give the various functional components of an ecosystem.
Q17. What is an ecological pyramid? Define and differentiate between different pyramid of energy and pyramid of numbers.
Q18. List the various steps of nitrogen cycle in a sequence.
Q19. The following organisms were identified in a pond ecosystem-Spirogyra, Euglena,Hydra, Daphnia, arthropod larvae, bass and sunfish. Make a food web and identify the trophic level of each one of them.
Q21. What do you understand by natural ecosystem ? Give examples.
Q22. Give differences between the following:
a. Alpine and arctic tundra
b. Savanna and prairie
c. Tropical and temperate forests
Q23. What do you understand by biodiversity? Explain its significance.
Q24. Give two desert adaptations of plants and animals.
Q25. Describe the various types of forest found in India (in brief).
Q26. Explain various zones of Himalayas.
Q27. Write short note on grassland and deserts found in India.
Q28. Explain how deforestation has resulted in ecological imbalance.
Q29. What is an ecotone? Explain its significance for the edge species.
Q30. Give two methods of protecting natural ecosystems.

      DPP - 27092021020BHPAT : Daily Practice Problems - Environmental Science (333) - 27/09/2021

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Q1. Trace the origin of the earth.
Q2. Describe briefly the solar system to which the earth belongs.
Q3. State the big bang theory of origin of universe.
Q4. Why is earth able to sustain life while no other planet is known to have life?
Q5 Name the five kingdoms of living organisms.
Q6. Define environment. List the various components of the environment
Q7. Name the abiotic and biotic natural resources.
Q8. Of what use are plants and animals to humans?
Q9. List 10 uses of water for human beings.
Q10. List the various sources of energy.
Q11. Trace the evolution of humans up to modern man.
Q12. What do you mean by the statement “early men were hunters and gatherers.”
Q13. State the purposes for which primitive man made tools.
Q14. Primitive humans were thrilled to discover fire and why?
Q15. How did humans think of cultivating crops?
Q16. What changes took place in the behaviour and life style of primitive humans after they became agriculturists?
Q17. What do you mean by “bronze age” and “Iron age”?
Q18. State the factors which led to industrialization.
Q19. What impact did years of use by growing population of humans have on environmental resources?
Q20. How is the utilization of fossils fuels related to a harmful impact on the environment?
Q21. List three reasons for human population explosion.
Q22. In what way has increase in human population has degraded the environment?
Q23. State three reasons for deforestation.
Q24. Write an essay on “impact of deforestation”.
Q25. Why modern agriculture is held responsible for polluting air and water?
Q26. Why the modern influx of humans from villages to cities causing is serious concern to urban planners?
Q27. Why “green house gases” are considered dangerous?
Q28. Why do environmentalists think that “marine fisheries” may collapse, if we are not careful?
Q29. Write notes on:
i. Mining and environmental degradation
ii. Acid rain
iii. Global warming and green house effect
iv. Biodiversity loss

      DPP - 27092021020BHPAT : Daily Practice Problems - Business Studies (215) - 27/09/2021

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Q1. Give two examples each of economic and non-economic activities.
Q2. Distinguish between Economic and Non-economic activities on the
basis of
(i) Purpose
(ii) Outcome
Q3. What is meant by an occupation?
Q4. Explain any two characteristics of employment.
Q5. Explain any two characteristics of profession.
Q6. Define the term ‘business.
Q7. Why do we call a person doing carpentry as engaged in a vocation?
Q8. A cobbler making shoes for himself is not engaged in business, why?
Q9. Describe the main characteristics of business.
Q10. What is meant by business? Describe any two characteristics of business.
Q11. How is business different from profession? Answer in about 60 words.
Q12. Discuss the broad categories of business activities, giving examples?
Q13. Explain the three types of occupations people are generally engaged in.
Q14. If there is no regularity in dealings, an activity cannot be called business. Do you agree? Give reasons in support of your answer.
Q15. Despite uncertainty of return, why is a businessman willing to invest money in the business?
Q16. Profit earning is the main objective of business. Explain.
Q17. Explain the economic objectives of business.
Q18. Enumerate the social objectives of business.
Q19. Explain the importance of national objectives of business.
Q20. Enumerate and explain the human objectives of business.
Q21. Explain the global objectives of business.
Q22. What is meant by social responsibilities of business?
Q23. Prepare a list of the interest groups with whom business interacts in itsday-to-day activities.
Q24. Why should business be responsible to the society? Give any three reasons.
Q25. State the responsibilities of business towards customers.
Q26. In what way should the business be responsible to the government?
Q27. Define environmental pollution and state the types of environmental pollution
Q28. Explain the various causes of air pollution.
Q29. State three important impacts of air pollution.
Q30. What are the effects of water pollution?

      DPP - 27092021020BHPAT : Daily Practice Problems - HISTORY - 27/09/2021

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Q1. How did the Bronze Age mark a shift from the New Stone Age?
Q2. What were the important features of the Harappa Civilisation?
Q3. Discuss how did the discovery of iron bring in radical changes in the lives of the people?
Q4. Describe the Roman society and economy during 5th century BC
Q5. Describe the social, religious and economic life of the Early Vedic people.
Q6. What is ‘dhamma’ according to Ashoka?
Q7. Write a short note on India’s contribution to World Civilisation
Q8. Explain why the Medieval Period is a significant period that needs to be studiedto understand the evolution of human society?
Q9. Describe the changes that took place in the political and economic life in Western Europe after the downfall of the Roman Empire.
Q10. Examine the main features of Medieval Indian economy.
Q11. What are the main teachings of Islam? Discuss in about 100 words.
Q12. ‘Arab Civilisation in the Medieval Period left behind a legacy of sicoveries and achievements’. Justify this statement.
Q13. Differentiate between Iqtadars and Mansabs.
Q14. What were the important teachings of the Bhakti Movement and Sufism? How did acted as a bridge between the Hindus and the Muslims?
Q15. Illustrate how Medieval Indian culture represented a harmonious synthesis of traditions in the fields of arts, architecture and music.
Q16. How did the rise of towns and emergence of trade led to the decline of feudalism?
Q17. Why do you think Renaissance marks a break from earlier patterns of thought and existence? Write in about 100 words.
Q18. How did the Reformation impact Europe and the rest of the world?
Q19. How did the discovery of new lands change the economy and society in the modern world?
Q20. Enlist the main ideas given in the Declaration of American Independence.
Q21. Which ideas of the French Revolution had an impact on the world order?
Q22. Discuss the strategies used by the German and Italian leaders for their unification.
Q23. Describe the conditions of the industrial workers which influenced the Russian Revolution.
Q24. How the inventions in the textile industry revolutionised the production of cotton cloth?
Q25. What were the various factors – political, economic, geographical and technological – which contributed to industrialisation in England?
Q26. State both the advantages and the disadvantages in the society with the coming of the Industrial Revolution.
Q27. Why did the industrialised countries start fighting amongst themselves for the control of the areas where Industrial Revolution had not taken place?
Q28. What made Japan join the race for colonies?
Q29. Mention both the positive and the negative effects of Imperialism on the colonies.
Q30. Examine the consequences of World War I.

      DPP - 02NCERT : Daily Practice Problems - CHEMISTRY - 27/09/2021

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Q1. Silver crystallises in fcc lattice. If edge length of the cell is 4.07 × 10–8 cm and density is 10.5 g cm–3, calculate the atomic mass of silver.

Q2. Niobium crystallises in body-centred cubic structure. If density is 8.55 g cm–3, calculate atomic radius of niobium using its atomic mass 93 u.

Q3. If the radius of the octahedral void is r and radius of the atoms in closepacking is R, derive relation between r and R.

Q4.  Copper crystallises into a fcc lattice with edge length 3.61 × 10–8 cm. Show that the calculated density is in agreement with its measured value of 8.92 g cm–3.

Q5. Gold (atomic radius = 0.144 nm) crystallises in a face-centred unit cell. What is the length of a side of the cell?.

Q6. Calculate the mole fraction of ethylene glycol (C2H6O2) in a solution containing 20% of C2H6O2 by mass.

Q7. Calculate the molarity of a solution containing 5 g of NaOH in 450 mL solution.

Q8. Calculate molality of 2.5 g of ethanoic acid (CH3COOH) in 75 g of benzene.

Q9. If N2 gas is bubbled through water at 293 K, how many millimoles of N2 gas would dissolve in 1 litre of water? Assume that N2 exerts a partial pressure of 0.987 bar. Given that Henry’s law constant for N2 at 293 K is 76.48 kbar.

Q10. The vapour pressure of pure benzene at a certain temperature is 0.850 bar. A non-volatile, non-electrolyte solid weighing 0.5 g when added to 39.0 g of benzene (molar mass 78 g mol-1). Vapour pressure of the solution, then, is 0.845 bar. What is the molar mass of the solid substance?

      DPP - 02NCERT : Daily Practice Problems - MATHEMATICS - 27/09/2021

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Q1. Show that the relation R in the set {1, 2, 3} given by R = {(1, 1), (2, 2),
(3, 3), (1, 2), (2, 3)} is reflexive but neither symmetric nor transitive

Q2. Check whether the relation R defined in the set {1, 2, 3, 4, 5, 6} as
R = {(a, b) : b = a + 1} is reflexive, symmetric or transitive

Q3. Show that if f : A → B and g : B → C are one-one, then gof : A → C is
also one-one.

Q4.  Show that if f : A → B and g : B → C are onto, then gof : A → C is
also onto

Q5. Let f : N → Y be a function defined as f(x) = 4x + 3, where,
Y = {y ∈ N: y = 4x + 3 for some x ∈ N}. Show that f is invertible. Find the inverse.

Q6.  Find the value of cos (sec–1 x + cosec–1 x), | x | ≥ 1

Q7. Show that 2tan–1 (cos x) = tan–1 (2 cosec x)

Q8. sin–1 (1 – x) – 2 sin–1 x = π/2, then x is equal to.

Q9. If a matrix has 8 elements, what are the possible orders it can have?

Q10. The number of all possible matrices of order 3 × 3 with each entry 0 or 1 is:?

      DPP - 01NCERT : Daily Practice Problems - PHYSICS - 27/09/2021

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Q1. An oil drop of 12 excess electrons is held stationary under a constant electric field of 2.55 × 104
 NC–1 (Millikan’s oil drop experiment). Thedensity of the oil is 1.26 g cm–3. Estimate the radius of the drop.
(g = 9.81 m s–2; e = 1.60 × 10–19 C).

Q2. A 12pF capacitor is connected to a 50V battery. How much electrostatic energy is stored in the capacitor?

Q3. A 600pF capacitor is charged by a 200V supply. It is then disconnected from the supply and is connected to another
uncharged 600 pF capacitor. How much electrostatic energy is lost in the process?

Q4. A long charged cylinder of linear charged density λ is surrounded by a hollow co-axial conducting cylinder. What is the electric field in the space between the two cylinders?

Q5. A charge of 8 mC is located at the origin. Calculate the work done in taking a small charge of –2 × 10–9 C from a point P (0, 0, 3 cm) to a point Q (0, 4 cm, 0), via a point R (0, 6 cm, 9 cm).

Q6. A storage battery of emf 8.0 V and internal resistance 0.5 Ω is being charged by a 120 V dc supply using a series resistor of 15.5 Ω. What is the terminal voltage of the battery during charging? What is the purpose of having a series resistor in the charging circuit?

Q7. In a potentiometer arrangement, a cell of emf 1.25 V gives a balance point at 35.0 cm length of the wire. If the cell is replaced by another cell and the balance point shifts to 63.0 cm, what is the emf of the second cell?

Q8. The number density of free electrons in a copper conductor estimated in Example 3.1 is 8.5 × 1028 m–3. How long does an electron take to drift from one end of a wire 3.0 m long to its other end? The area of cross-section of the wire is 2.0 × 10–6 m2 and it is carrying a current of 3.0 A.

Q9. A silver wire has a resistance of 2.1 Ω at 27.5 °C, and a resistance of 2.7 Ω at 100 °C. Determine the temperature coefficient of resistivity of silver.

Q10. The storage battery of a car has an emf of 12 V. If the internal resistance of the battery is 0.4 Ω, what is the maximum current that can be drawn from the battery?

      DPP - 01NIOS : Daily Practice Problems - GEOGRAPHY(316) - 24/09/2021

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Q1. What are the limitations of direct methods in the determination of the earth’s
interior?
Q2. Draw and label a diagram showing earth’s interior and its density and depth
of each layer.
Q3. Distinguish between a rock and a mineral with suitable examples.
Q4. Discuss the classification of various types of rocks on the basis of their mode
of formation. Support your answer with examples.
Q5. Explain in brief the economic significance of rocks and minerals.
Q6. Compare the processes of formation of metamorphic and sedimentary rocks.
Q7. What is weathering? Name the different types of weathering.
Q8. How does chemical weathering take place?
Q9. Differentiate between
(a) Disintegration and Decomposition
(b) Degradation and Aggradation
(c) Oxidation and Solution
Q10. Explain the process of gradation.
Q11. How does man become an important agent of weathering?
Q12. Explain the following processes of weathering by drawing simple diagrams:
(a) Block disintegration
(b) Frost action
(c) By plant action
Q13. Give a brief account of soil profile. Illustrate your answers with a diagram.
Q14. Discuss various factors responsible for soil formation
Q15. What is isostasy?
Q16. Explain the concept of isostasy according to Airy.
Q17. Explain the isostatic balance of the earth as proposed by Pratt.
Q18. Differentiate the ideas between Airy and Pratt.
Q19. Discuss the isostatic balance at global level.
Q20. Discuss the evidences of continental drift.
Q21. What is plate? Explain the mechanism of plate movement.
Q22. Discuss the activities at plate margins.
Q23. Describe the distribution of earthquakes and volcanoes with the help of plate
boundaries.

      DPP - 01 : Daily Practice Problems - ENGLISH - 24/09/2021

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Q1. Find words in the story which are opposite in meaning to the following words:
1. loose
2. happy
3. loudly
4. noisy
5. young
6. safety

Q2. Write the simple past tense of the following verbs. Put them in column A (regular) or
column B (irregular) as the case may be.
draw, walk, manage, hold, ask, forgive, drive,
meet, swim, repair, shake, cook, ring, clean,
enjoy, bear, lead, cheat, write, eat,

Q3. Form adverbs from the adjectives and use them in your own sentences.
neat, nice, soft, clear, elegant, careful, regular, graceful

Q4.  Given below are some more examples of irregular verbs: Convert simple present tense to simple past tense
1.run
2.hear
3.bring
4.buy
5.deal
6.bind
7.take
8.throw
9. catch

Q5. Complete the sentences using two adjectives in each sentence.
1. My favourite possession is a\ an ________________________________.
2. I would like to buy a \ an __________________________for my mother.
3. My father has a \an ___________________________________.
4. I like ____________. I think she is _______________ actress.
5. I live in a \an __________________.

Q6. Write a Notice with the details in the description:
Brand name Classique ladies
Size & shape small diamond-shaped
Colour of dial golden
Colour of strap black

You lost a briefcase containing important documents while travelling by bus. Complete the
following notice to be inserted in a newspaper. Include all the details describing the briefcase
and its contents. Give your contact number and address.

Q7. Complete the following summary
of sections II & III using appropriate phrasal verbs. You will have to change the form of
the verbs. { dive into, run out of, go into, give up, push through, pull off, fall into }

On reaching the well, Kondiba __________ the crowd. He came to know that a small
boy had ____________ the well. He ____________ his shirt and _________ the well.
He ______ the well twice but failed to find the boy. He had _____________ breath, but
he did not __________. He went into the well once again. He felt the shirt of the boy and
pulled him out. In spite of his blindness, Kondiba was able to rescue the boy.

Q9. You have moved to a new neighbourhood. Your next-door neighbour is very jolly and
friendly. Write a letter to your friend telling him/her about this neighbour.

Q10. Antonyms are words which give opposite meanings.
1.good
2.up
3.obedient
4.weak
5.proper

Q11.  Read the following sentences and write them in indirect speech.

a. The invigilator said to the students, ‘Stop writing.’
____________________________________________________________
b. The officer said to the peon, ‘Bring a file cover for me.’
____________________________________________________________
c. Anil said to his friend, ‘Please take out the car while I lock the room.’
____________________________________________________________
d. The ticket collector said to Varun, ‘Why didn’t you buy a full ticket for your son?’
____________________________________________________________
e. ‘May I borrow your English book for the evening?’ said Usha to Rajni.
____________________________________________________________
f. The parents said to the Principal, ‘Please admit our daughter in your school.’
____________________________________________________________
g. Father said to his son, ‘Switch off the television. I am getting disturbed.’
____________________________________________________________
h. Anita said to Nikhil, ‘Help your younger sister in her studies.’
____________________________________________________________
i. Hitendra said to Shyam, ‘Have a cup of tea with me, please.’
____________________________________________________________
j. I said to him, ‘Come in.’
____________________________________________________________

      DPP - 01NIOS : Daily Practice Problems - ENGLISH(202) - 24/09/2021

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Q1. Read the extract given below and answer the questions that follow:
She was shocked. She cried for help. Grandfather came running. When he learnt that I had a snake in the
shell, he snatched the shell and threw it away.
i) Who is ‘she’ in the above lines?
ii) Why did she cry for help?
iii) Where had the narrator got the snake from?

Q2. Read the extract given below and answer the questions that follow:
I sat on Grandfather’s lap.The old man then took some water in a small brass vessel, sat in front of us and
started reciting some mantras.
i) Who is the old man here?
ii) Why was he doing the things mentioned above?
iii) Find a word similar in meaning to ‘chanting’.

Q3. What do you think Raja felt when he had to sit in front of the old man to be treated for a snake-bite?

Q4. How did the squirrel justify what he was doing?

Q5. Kondiba was tired but he did not give up hope. Why? Give two reasons

Q6. Write a paragraph of 20-25 words about the three activities of the tall trees as described in the poem.

Q7. Why wasn’t the Master happy to write the affidavit?

Q8. In what language did the Master write the affidavit? Why did he do so?

Q9. In which jail was Pt. Nehru imprisoned by the British?

Q10. Why was Pt. Nehru not able to send a gift to his daughter on her birthday?